FIKE P/N 06-153 Micromist Design Manual
Short Description
Manual de diseño de sistemas MicroMist Marca Fike....
Description
Design, Installation, and Maintenance Manual P/N 06-153 Revision: 2 Revision Date: March, 2008
REVISION HISTORY Document Name:
DESIGN, INSTALLATION, AND MAINTENANCE MANUAL FOR MICROMIST
Original release date of manual:................................................................................................................. April, 2000 Revision / Description of Change
Revision Date
Revision A............................................................................................................................................ February, 2003 Revision 2 .................................................................................................................................................March, 2008 1) Add Revision History page and changed from revision letters to numbers 2) Changed Cycle Time in Sections 2 and 3 3) Deleted Figures 2.3-A and 2.3-B in Section 2 page 6 of 10 4) Changed Duration of Protection for Turbine Generators to 10 minutes in Sections 1 and 5 5) Deleted Figure 5.9 in Section 5 page 8 of 8 6) Deleted reference to Cheetah and Cheetah Tracker, Added reference to Cheetah Xi and Xi 50 with C-Linx in Section 5 page 7 of 7 7) Changed Pressures on N2 Cylinder Fill Chart in Section 7 page 3 of 4 8) Updated Parts List and Figures in Section 8 9) Changed Container fill capacity from 107 (405 L) gallons to 112 (424 L) gallons
Manual P/N: 06-153
TABLE OF CONTENTS Page No.
SECTION 1 ................................................................................................................................................. 3 Pages 1.0
INTRODUCTION ...........................................................................................................................................1
1.1
PURPOSE .....................................................................................................................................................2
1.2
SYSTEM LIMITATIONS................................................................................................................................2
1.3
OPERATING PRINCIPLES...........................................................................................................................3
1.4
PERSONNEL SAFETY .................................................................................................................................3
1.5
DEFINITIONS ................................................................................................................................................3
SECTION 2 ............................................................................................................................................... 10 Pages 2.0
EQUIPMENT .................................................................................................................................................1
2.1
SYSTEM STRUCTURE.................................................................................................................................1
2.1.1
70 Gallon (265 Liter) Micromist System ........................................................................................................2
2.1.2
112 Gallon (424 Liter) Micromist System ......................................................................................................3
2.1.3
High-Pressure Side of System ......................................................................................................................4
2.1.4
Regulator .......................................................................................................................................................4
2.1.5
Low-Pressure Side of System .......................................................................................................................4
2.1.6
Mounting Structure ........................................................................................................................................4
2.2
NOZZLE ASSEMBLIES................................................................................................................................5
2.3
CONTROL PANEL........................................................................................................................................6
2.4
CONTROL ACCESSORIES..........................................................................................................................7
2.4.1
Detection........................................................................................................................................................7
2.4.2
Control Modules.............................................................................................................................................7
2.4.2.1 Fast Response Contact Monitor (FRCM) ......................................................................................................7 2.4.2.2 MINI Input Module (MIM) and Addressable Input Module (AIM)...................................................................7 2.4.2.3 Supervised Output Module (SOM) ................................................................................................................7 2.4.2.4 Solenoid Releasing Module (SRM) ...............................................................................................................8 2.4.2.5 Duel Relay Module (R2M) .............................................................................................................................8 2.4.3
Pressure Switch.............................................................................................................................................8
2.5
MANUAL ACTIVATION ................................................................................................................................8
2.6
PIPING NETWORK.......................................................................................................................................9
2.7
CAUTION / ADVISORY SIGNS ....................................................................................................................9
2.7.1
Water Mist Discharge Alarm (Exterior) – P/N 02-10262................................................................................9
2.7.2
Water Mist Discharge Alarm (Interior) – P/N 02-10263.................................................................................9
2.7.3
Water Mist Caution Sign – P/N 02-10264 ...................................................................................................10
2.7.4
Water Mist System Release – P/N 02-10265..............................................................................................10
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Table of Contents / Page 1 of 4 Revision: 2 Revision Date: March, 2008
TABLE OF CONTENTS SECTION 3 ............................................................................................................................................... 13 Pages 3.0
DESIGN .........................................................................................................................................................1
3.1
ELECTRICAL CLEARANCES......................................................................................................................1
3.2
DETECTOR REQUIREMENTS.....................................................................................................................1
3.2.1
Design............................................................................................................................................................1
3.2.2
Detector Quantity and Spacing......................................................................................................................1
3.3
SYSTEM SELECTION ..................................................................................................................................1
3.3.1
Machinery Space ...........................................................................................................................................2
3.2.1
Gas Turbine Space........................................................................................................................................2
3.4
SYSTEM DESIGN – MACHINERY SPACES ...............................................................................................2
3.4.1
Nozzle Layout ................................................................................................................................................3
3.4.1.1 Nozzle Quantity .............................................................................................................................................3 3.4.1.2 Nozzle Spacing..............................................................................................................................................3 3.4.2
System Size Selection...................................................................................................................................4
3.4.3
Piping Network...............................................................................................................................................4
3.4.3.1 Piping Layout .................................................................................................................................................4 3.4.3.2 Determining Pipe Size ...................................................................................................................................4 3.5
SYSTEM DESIGN – GAS TURBINE SPACES ............................................................................................5
3.5.1
Nozzle Layout ................................................................................................................................................6
3.5.1.1 Nozzle Quantity .............................................................................................................................................6 3.5.1.2 Nozzle Spacing..............................................................................................................................................7 3.5.2
System Size Selection...................................................................................................................................7
3.5.3
Piping Network...............................................................................................................................................7
3.5.3.1 Piping Layout .................................................................................................................................................7 3.5.3.2 Determining Pipe Size ...................................................................................................................................8 3.6
PRESSURE DROP FACTORS AND EQUIVALENT LENGTHS .................................................................9
3.6.1
Copper Tubing Tables ...................................................................................................................................9
3.6.2
Stainless Steel Tubing Tables .....................................................................................................................11
3.6.3
Stainless Steel Pipe Tables.........................................................................................................................13
SECTION 4 ............................................................................................................................................... 24 Pages 4.0
SAMPLE PROBLEMS ..................................................................................................................................1
4.1
SAMPLE PROBLEMS – MACHINERY SPACES ........................................................................................1
4.1.1
Problem Number 1 ........................................................................................................................................1
4.1.1.1 Determining Hazard Volume .........................................................................................................................1 4.1.1.2 Nozzle Quantity .............................................................................................................................................1 4.1.1.3 Nozzle Spacing..............................................................................................................................................1 Table of Contents / Page 2 of 4 Revision: 2 Revision Date: March, 2008
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TABLE OF CONTENTS 4.1.1.4 System Size Selection...................................................................................................................................2 4.1.1.5 Piping Layout .................................................................................................................................................2 4.1.1.6 Determining Pipe Size ...................................................................................................................................3 4.1.2
Problem Number 2 ........................................................................................................................................6
4.1.2.1 Determining Hazard Volume .........................................................................................................................6 4.1.2.2 Nozzle Quantity .............................................................................................................................................7 4.1.2.3 Nozzle Spacing..............................................................................................................................................7 4.1.2.4 System Size Selection...................................................................................................................................8 4.1.2.5 Piping Layout .................................................................................................................................................8 4.1.2.6 Determining Pipe Size ...................................................................................................................................9 4.2
SAMPLE PROBLEMS – GAS TURBINE SPACES ...................................................................................12
4.2.1
Problem Number 1 ......................................................................................................................................12
4.2.1.1 Determining Hazard Volume .......................................................................................................................12 4.2.1.2 Nozzle Quantity ...........................................................................................................................................12 4.2.1.3 Nozzle Spacing............................................................................................................................................13 4.2.1.4 Piping Layout ...............................................................................................................................................14 4.2.1.5 Determining Pipe Size .................................................................................................................................15 4.2.2
Problem Number 2 ......................................................................................................................................16
4.2.2.1 Determining Hazard Volume .......................................................................................................................16 4.2.2.2 Nozzle Quantity ...........................................................................................................................................17 4.2.2.3 Nozzle Spacing............................................................................................................................................17 4.2.2.4 Piping Layout ...............................................................................................................................................18 4.2.2.5 Determining Pipe Size .................................................................................................................................19
SECTION 5 ................................................................................................................................................. 7 Pages 5.0
SYSTEM INSTALLATION ............................................................................................................................1
5.1
STORAGE CONTAINERS ............................................................................................................................1
5.2
DISCHARGE PIPING CONNECTION...........................................................................................................1
5.3
PIPING NETWORK MATERIALS.................................................................................................................1
5.3.1
Tubing and Pipe.............................................................................................................................................1
5.3.1.1 Recommended Tube Fittings ........................................................................................................................2 5.3.2
Fitting Materials .............................................................................................................................................2
5.3.3
Size Reductions.............................................................................................................................................2
5.3.4
Pipe Joints .....................................................................................................................................................2
5.4
INSTALLING MAIN DISCHARGE PIPING...................................................................................................3
5.5
NITROGEN VALVE CONNECTIONS ...........................................................................................................3
5.5.1
70 Gallon (265 Liter) Nitrogen Valve Connection..........................................................................................4
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Table of Contents / Page 3 of 4 Revision: 2 Revision Date: March, 2008
TABLE OF CONTENTS 5.5.2
112 Gallon (424 Liter) Nitrogen Valve Connections ......................................................................................5
5.6
SOLENOID VALVE WIRING ........................................................................................................................6
5.7
LIQUID LEVEL SWITCH WIRING ................................................................................................................7
5.8
WATER TANK FILL PROCEDURE..............................................................................................................7
5.9
PROGRAMMING THE CHEETAH CONTROL PANEL................................................................................7
SECTION 6.0 ............................................................................................................................................... 2 Page 6.0
FINAL SYSTEM CHECKOUT.......................................................................................................................1
6.1
HAZARD AREA CHECK ..............................................................................................................................1
6.1.1
Area Configuration.........................................................................................................................................1
6.1.2
Area Security .................................................................................................................................................1
6.1.3
Personnel Safety ...........................................................................................................................................1
6.2
SYSTEM CHECK
6.2.1
Containers .....................................................................................................................................................1
6.2.2
Discharge Piping............................................................................................................................................1
6.2.3
Nozzles ..........................................................................................................................................................1
6.2.4
Auxiliary Functions.........................................................................................................................................1
6.2.5
Control Panel .................................................................................................................................................1
SECTION 7 ................................................................................................................................................... 4 Page 7.0
SYSTEM MAINTENANCE ............................................................................................................................1
7.1
DISCHARGE PIPING....................................................................................................................................1
7.2
DISCHARGE NOZZLES ...............................................................................................................................1
7.3
NFPA 750 INSPECTION, MAINTENANCE, AND TESTING FREQUENCIES ............................................1
7.4
RECHARGING OF NITROGEN CYLINDERS ..............................................................................................2
7.4.1
Recharge Procedure .....................................................................................................................................2
7.4.2
Quality Assurance..........................................................................................................................................3
7.4.2
Nitrogen Cylinder Fill Chart ...........................................................................................................................3
7.5
POST FIRE MAINTENANCE ........................................................................................................................4
SECTION 8 ................................................................................................................................................. 6 Pages 8.0
PARTS LIST..................................................................................................................................................1
8.1
MICROMIST SYSTEM PACKAGES.............................................................................................................1
8.1.1
Micromist System Packages .........................................................................................................................1
8.1.2
Micromist System Packages with Pressure Switch(s)...................................................................................1
8.2
MICROMIST NOZZLES ................................................................................................................................1
8.2.1
Micromist Nozzle Assemblies........................................................................................................................1
8.3
MICROMIST SYSTEM SPARE PARTS .......................................................................................................2
Table of Contents / Page 4 of 4 Revision: 2 Revision Date: March, 2008
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Section 1 Introduction
INTRODUCTION 1.0 INTRODUCTION Fike Corporation is proud to present the Fike Micromist£ Fire Suppression System. The Fike Micromist System is a self-contained, single fluid, pre-engineered, water mist fire suppression system for total compartment protection of machinery spaces and gas turbine spaces. Micromist is an intermediate pressure, 175 to 500 psi (11,207 to 3,447 kPa), system that uses a fine water spray to extinguish a fire. The fine spray extinguishes a fire by cooling the flame and fire plume, displacing oxygen with water vapor, and reducing the amount of radiant heat. Micromist systems are designed, and have been tested, for use in protecting flammable liquid (Class B) processes and incidental combustible (Class A) materials. Micromist applications include, but are not limited to, the following: x x x x x x x x x x x x x x x
Compartmentalized gas turbines Engine test cells Generator rooms Machinery spaces with incidental storage of flammable liquids Oil pumps Lubrication skids Oil reservoirs Diesel emergency rooms Fuel filters Dipping, electrostatic coating, or cleaning processes using flammable liquids Gear boxes Drive shafts Engine driven generators Chemical processes Flammable or combustible liquid pumps, piping, or containers under pressure such as may be used with hydraulic pumping equipment
For applications not listed above, contact Fike Product Support (1-816-229-3405) for application approval. 1.1 PURPOSE This manual will assist the Fike Sales Outlets in the proper design, installation, and maintenance of Micromist systems. In addition, the Authority Having Jurisdiction (AHJ) over the installed Micromist system will be able to use this manual to easily confirm that all design parameters have been met. Micromist Systems must be designed and installed within the limitations established by Factory Mutual (FM) approvals, NFPA 750, “Standard for the Installation of Water Mist Fire Protection Systems”, and this manual, P/N 06-153, which complies with these requirements and limitations.
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Micromist£ Manual P/N: 06-153
Section 1 / Page 1 of 3 Revision: 2 Revision Date: March, 2008
INTRODUCTION 1.2 SYSTEM LIMITATIONS The following limitations apply to the use and application of Fike Micromist Systems: 1. Micromist systems are capable of protecting hazards with maximum volumes not exceeding 9,175 ft3 (260 m3), with a maximum ceiling height of 16 ft. (4.9 m). 2. The following items pertain to the hazard enclosure: x The protected hazard should be equipped with: Automatic door closures, a ventilation system, and automatic fuel shutdown. x Lubrication supply should be shutoff as soon as possible. x It is recommended that all, non-emergency, electrical power to the protected space be interrupted at the time of system discharge. 3. Micromist skid must be installed in a location where the ambient temperature is maintained within +40°F to +130°F (4.4°C to 54.4°C) and must be protected from inclement weather, mechanical, chemical, or other damage. 4. The Micromist System shall not be used for direct application to materials, or products, that react with water to produce violent reactions or significant amounts of hazardous products. These materials include: x x x x x x x x x x x
Reactive metals (e.g. Sodium, Potassium, Magnesium, Titanium, Lithium, Uranium, and Plutonium) Metal Alkoxides (e.g. Sodium Methoxide) Metal Amides (e.g. Sodium Amide) Carbides (e.g. Calcium Carbide) Halides (e.g. Benzoyl Chloride) Hydrides (e.g. Lithium Aluminum Hydride) Oxyhalides (e.g. Phosphorus Oxybromide) Silanes (e.g. Trichlormethyl Silane) Sulfides (e.g. Phosphorus Pentasulfide) Cyanates (e.g. Methylisocyanate) The Micromist System SHALL NOT be used for direct application to liquefied gases at cryogenic temperatures, such as liquefied natural or propane gases, which boil violently when heated by water.
5. Micromist Systems CAN be used to protect an area having a flammable liquid present, provided it is a Flammability Class of 1, 2, or 3 as defined by the Fire Protection Guide to Hazardous Materials, 2001 Edition. Examples of Class 1, 2, and 3 flammable liquids are: x Fuels such as #2 Diesel Fuel, Gasoline, Kerosene, Mineral Spirits, and Jet Fuels (4, 5, & 6) x Oils such as Lubricating, Hydraulic Oil & Fluid, Transformer, and Crude. 6. Liquids with a flash point below 73°F (22.8°C) and a boiling point below 100°F (37.8°C) are Class 1A liquids that CANNOT be protected with a Micromist System. Liquids with a flash point above 73°F (22.8°C) that are categorized as Class 1B, 1C, 2, or 3 (A or B) as defined by the Fire Protection Guide to Hazardous Materials, 2001 Edition CAN be protected with a Micromist System. 7. Micromist Systems CANNOT be used to protect an area with a Class 4 flammable liquid as defined by Fire Protection Guide to Hazardous Materials, 2001 Edition. Examples of Class 4 flammable liquids are: Methane, Propane, Natural Gas, Butane, and Hydrogen. x
Exception: Natural Gas and Propane driven Turbine Generator units may be protected providing the fuel source is shut down prior to discharge.
8. The Micromist System provides 10 minutes of active protection for both Machinery Spaces and Gas Turbine Spaces. 9. Micromist Systems can be used to protect hazards having a range in temperature from +40°F to +325°F
(+4.4°C to +162.7°C).
Section 1 / Page 2 of 3 Revision: 2 Revision Date: March, 2008
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INTRODUCTION 1.3 OPERATING PRINCIPLES Water is an outstanding fire suppression agent due to its high heat capacity and latent heat of vaporization. The Micromist nozzles use a plate to slice the small jets of water that flow through the nozzle orifice. The resulting water mist contains a variety of droplet sizes. The larger droplets provide the necessary energy and momentum to carry the smaller droplets to the base of the fire where the mist vaporizes and extinguishes the fire. The simple theory behind this development is a large amount of small droplets have a greater surface area than the same number of large droplets, therefore absorbing more heat. Water mist systems extinguish fires using the following basic principles: x
Cooling – As the mist is converted into vapor it removes heat from the fire source.
x
Oxygen displacement – As the water mist turns to steam it expands approximately 1,700 times, forcing oxygen away from the flame front, thus denying it the oxygen necessary to support combustion. (localized inert environment)
x
Wetting – Primarily for incidental class A fires; wetting of the surface helps extinguish the fire as well as contain it.
The Micromist System extinguishes a fire by delivering a controlled, cyclic supply of water to a network of nozzles. Upon activation, and throughout the active protection period, the Fike Cheetah Control Panel sends signals to both high and low pressure side solenoids, to provide and control the required cyclic supply of water. The Nozzle Assemblies receive the water through the pre-engineered piping network. The nozzles create a fine water mist by the impingement of the water on the edge of a plate. The fine mist produced is directed into the protected space by nozzle placement. 1.4 PERSONNEL SAFETY For fire situations, suitable safeguards SHALL be provided to ensure prompt and complete evacuation of, and prevent entry into, hazardous atmospheres and also to provide for prompt rescue of persons trapped within a protected space. Safety considerations, such as personnel training, caution and/or advisory warning signs, discharge alarms and lights, self-contained breathing apparatus (SCBA), evacuation plans, and fire drills shall all be carefully planned and implemented. Refer to NFPA Standard 750, Section 4.2 for additional safety requirements. 1.5 DEFINITIONS Fike recognizes the difference between pipe and tube; however, for ease of understanding, the term “pipe” will be used to describe both pipe and tubing. Cycle – A single on/off sequence of the solenoid. Elevation Change – The net difference in elevation from the water outlet on the Water Storage Container to the most remote nozzle. Node - A section of the piping network which supplies water to a certain number of nozzles, and includes all fittings in that section. Also includes the tee supplying the pipe section. Nozzle Flow – The number of nozzles being supplied by a section of pipe. Potable Water – Water that is fit to drink with respect to particulate and dissolved solids. Pressure Drop – The amount of pressure lost due to elevation change, nozzle output, fittings, and distance of the most remote nozzle. Shot – A series of cycles, where the type of space being protected determines the quantity of cycles.
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Micromist£ Manual P/N: 06-153
Section 1 / Page 3 of 3 Revision: 2 Revision Date: March, 2008
Section 2 Equipment
EQUIPMENT 2.0 EQUIPMENT This section covers the hardware included in a Micromist System, and includes optional items that are available. 2.1 SYSTEM STRUCTURE The Micromist System is offered in 70 and 112 gallon (265 and 424 Liter) configurations. The 70 gallon system consists primarily of one nitrogen cylinder and a water storage container (See Figure 2.1-A). The 112 gallon system has two nitrogen cylinders and one water storage container (See Figure 2.1-B).
70 GALLON (265 LITER) MICROMIST SYSTEM Figure 2.1-A
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112 GALLON (424 SYSTEM Figure 2.1-B
Micromist£ Manual P/N: 06-153
Section 2 / Page 1 of 10 Revision: 2 Revision Date: March, 2008
EQUIPMENT 2.1.1 70 GALLON (265 LITER) MICROMIST SYSTEM The 70 gallon (265 Liter) Micromist System is shipped with all major components pre-assembled. Note: A 70 gallon (265 Liter) Micromist System may be purchased with a pressure switch on the control valve assembly for monitoring the nitrogen tank pressure. The following drawing shows the overall dimensions of the system and the location of the system components that are to be assembled in the field (See Figure 2.1.1). 1) 2) 3) 4) 5) 6) 7)
73-007 73-005 CO2-1290 02-4543 02-4521 02-4537 02-4606
Assembly, Control Valve Assembly, Control Valve W / Pressure Switch Hose, Braided 1/4” (8mm) JIC Ends x 7 1/2” (191mm) long, SS / Brass Connector 1/4” (8mm) x 1/8” (4mm), Brass Orifice 1/8” (4mm), Brass Tee, Run 1/8” (4mm), Brass Hose, Braided 1/2” (15mm) NPT x 1/2” (15 mm) JIC x 12” (305mm) Long, SS / Brass
HIGH-PRESSURE SIDE WITH STANDARD -ORPRESSURE GAUGE 3
4
5
HIGH-PRESSURE SIDE WITH OPTIONAL PRESSURE SWITCH
6
3
4
5
6
7
1
LOW-PRESSURE SIDE
7
2
3
4" NPT Water Outlet
66 3 4" (1.7 m) 55" Approx. (1.4 m)
29 1 2" (0.7 m)
47 1 2" (1.2 m)
70 Gallon Micromist System Figure 2.1.1
Section 2 / Page 2 of 10 Revision: 2 Revision Date: March, 2008
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EQUIPMENT 2.1.2 112 GALLON (424 LITER) MICROMIST SYSTEM The 112 gallon (424 Liter) Micromist System is shipped with all major components pre-assembled. Note: A 112 gallon (424 Liter) Micromist System may be purchased with a pressure switch on the control valve assemblies for monitoring the nitrogen tank pressure. The following drawing shows the overall dimensions of the system and the location of the system components that are to be assembled in the field (See Figure 2.1.2). 1) 2) 3) 4) 5) 6) 7) 8) 9) 10) 11)
73-007 73-005 CO2-1290 02-4543 02-4539 02-4533 02-4538 02-4521 02-4537 73-009 73-008
Assembly, Control Valve Assembly, Control Valve W / Pressure Switch Hose, Braided 1/4” (8mm) JIC Ends x 7 1/2” (191mm) long, SS / Brass Connector 1/4” (8mm) x 1/8” (4mm), Brass Tee, Branch 1/8” (4mm), Brass Hose, Braided 1/2” (15mm) NPT x 1/2” (15mm) JIC x 23” (584mm) Long, SS / Brass Hose, Braided 1/8” (4mm) NPT x 1/4” (8mm) JIC x 13 1/2” (343mm) Long, SS / Brass Orifice 1/8” (4mm), Brass Tee, Run 1/8” (4mm), Brass Assembly, Pressure Gauge (Tank 2) Assembly, Pressure Switch (Tank 2)
HIGH-PRESSURE SIDE WITH -OR- HIGH-PRESSURE SIDE WITH STANDARD PRESSURE GAUGES OPTIONAL PRESSURE SWITCHES
5 4 3
1
4
6
7
5 8
4
6
4 9 10
7
8
9
3
LOW-PRESSURE SIDE
11
2
3/4" NPT Water Outlet
851 2" (2.7 m) 76" Approx. (1.9 m)
291 2" (0.7 m)
471 2" (1.2 m)
112 Gallon Micromist System Figure 2.1.2
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Section 2 / Page 3 of 10 Revision: 2 Revision Date: March, 2008
EQUIPMENT 2.1.3 HIGH-PRESSURE SIDE OF SYSTEM The high-pressure sides of both the 70 gallon (265 Liter) and 112 gallon (424 Liter) Micromist Systems consist of all the parts up to the regulator. These parts include the following: x
Nitrogen Tank Assembly(s) consisting of 4,100 in3 (67.2 Liter) spun steel cylinder(s), with a DOT rating of 3AA-2300, and Fike Nitrogen Valve Assembly(s), pressurized to 1,850 – 1,980 psi @ 70°F (12,893 – 13,652 kPa @ 21°C).
x
Solenoid Control Assembly containing a pressure gauge, with an option for a pressure switch, to control the cycling of pressure in the Nitrogen Tank Assembly(s).
x
High-pressure fittings and hoses to supply Nitrogen to the regulator as well as the pilot port(s) of additional Fike Nitrogen Valve Assembly(s), as required.
The nitrogen is used as the driving force to propel the water from the Water Container through the piping network to the discharge nozzles. 2.1.4 REGULATOR A factory preset pressure regulator is used to reduce the high pressure from the Nitrogen Tank Assembly(s) to maintain 320 psi (2,206 kPa) in the Water Storage Container, during active operation. The brass regulator is rated for a maximum inlet pressure of 3,000 psi (20,684 kPa) and is pre-set to supply an outlet pressure of 320 psi (2,206 kPa) to the Water Storage Container. Inlet and outlet gauges are supplied for monitoring nitrogen pressures during operation. 2.1.5 LOW-PRESSURE SIDE OF SYSTEM The low-pressure side of the 70 gallon (265 Liter) and 112 gallon (424 Liter) Micromist Systems consist of all the parts after the regulator. These parts include the following: x x x x
Water Storage Container, 70 or 112 gallon (265 or 424 Liter) capacity steel tank, with a DOT rating of 4BA-500, epoxy coated interior, and exterior painted red, normally at atmospheric pressure. Water Valve Assembly is used to cycle the flow of water from the container, and consists of an air actuator, ball valve, solenoid, fittings, and hoses. Liquid level switch to assure a proper level of water in the Water Storage Container. This switch is a normally open, SPST switch, that closes when the water drops below the predetermined level. Components to deliver pressure to water storage tank and air actuator, as listed below: 1) Rupture disc assembly to protect the water storage container from over-pressurization. The rupture disc is designed for a specified burst pressure of 500 psi @ 72°F (3,447 kPa @ 22°C). 2) 1/2” (15mm) check valve to keep water out of regulator and air actuator. 3) 1/2” (15mm) vent valve for air discharge when filling the Water Storage Container. 4) 1/2” (15mm) cross for connecting the above 3 items to the tank. 5) 1/2” (15mm) tee to direct air to tank and hoses connected to air actuator. 6) Adapters to connect regulator to tee, cross to tank and hoses to Water Valve Assembly. 7) Drain / fill valve with supervision / locking capability attached to bottom of tank having a 2” (50mm) x 1/2” (15mm) male adapter. 8) Inline filter attached to drain / fill valve to collect contaminants when filling and refilling the Water Storage Container. 9) Siphon tube attached to water valve assembly to assure drawing the water from the bottom of the Water Storage Container.
2.1.6 MOUNTING STRUCTURE Each Micromist System is factory pre-assembled and mounted on a welded steel skid. The Water Storage Container is attached to the Nitrogen Tank Assembly(s) with mounting straps and a Uni-strut£ bracket. This makes it easy to install the Micromist System by minimizing the amount of assembly required in the field.
Section 2 / Page 4 of 10 Revision: 2 Revision Date: March, 2008
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F.M. J.I. 3000746
EQUIPMENT 2.2
NOZZLE ASSEMBLIES The Micromist System nozzle is designed to produce a fine water mist, which is extremely effective when utilized within the specified limits. The nozzle is constructed of Brass, and utilizes a diffuser plate to slice the small jets of pressurized water that flows through the nozzle orifice. The nozzle comes with a strainer screen to catch any particles that might clog the nozzle orifice. The nozzle is equipped with 1/2” (15 mm) NPT female threads to facilitate connection to the pipe network. The nozzle has a nominal flow rate of 2.1 gallons/ minute (7.9 liters/minute). There are two different Micromist System nozzles, which are used depending on the hazard being protected. The nozzles are identical, except for the distance of the diffuser plate from the nozzle orifice. The nozzles used for the protection of Gas Turbine spaces have the diffuser plate somewhat closer to the nozzle orifice than the nozzle for the machinery spaces. With the plate closer to the nozzle orifice, the stream hits the diffuser plate a slightly different angle, creating an overall smaller water mist.
The part number is etched on the side, and a colored sticker is applied to identify each nozzle. A red sticker indicates a Turbine Generator Space and a blue sticker indicates a machinery space nozzle (See Figure 2.2).
1/2" NPT Female
Nozzle Adapter
Strainer Nozzle Body Nozzle Orifice
Diffuser Plate
Stainless Steel Washer Stainless Steel Screw
1/2" NPT Female
Nozzle Adapter
Strainer Nozzle Body Nozzle Orifice
Spacer Plate
Stainless Steel Washer Stainless Steel Screw
Red Sticker
Diffuser Plate Blue Sticker
Machinery Space Nozzle P/N 73-0024
Gas Turbine Space Nozzle P/N 73-0023
Nozzle Assemblies Figure 2.2
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Section 2 / Page 5 of 10 Revision: 2 Revision Date: March, 2008
EQUIPMENT 2.3 CONTROL PANEL The Cheetah Fire Detection and Control System is a microprocessor based analog addressable system. The system is capable of controlling a maximum of 8 Micromist Systems simultaneously. The basic system consists of a controller with two signaling line circuits capable of supporting up to 254 addressable points, a 5.0 amp power supply, 4.0 amps of power limited auxiliary power, two (2) notification appliance circuits, three Form-C dry contacts. Programming the Cheetah Fire Control System, (See Cheetah Manual) results in a cycle application of water mist into the protected area. The mist is directed into the protected area for 40 seconds and turned off for 40 seconds (8 cycles “on” and 7 cycles “off”) for a minimum of 10 minutes. This on/off cycle time applies to both Machinery Space and Gas Turbine Generator Space applications.
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EQUIPMENT 2.4 CONTROL ACCESSORIES The control accessories required for the operation of the Micromist System are described in the following paragraphs. 2.4.1 DETECTION The recommended detector for Micromist, is a vertical, “stick” type, thermal detector, due to the extreme conditions encountered in most Micromist applications (i.e., extended temperatures, presence of fumes, dust and dirt, etc.). The thermal detector is used to detect the presence of heat exceeding the detector’s set-point. The detector contacts are normally open, closing on a temperature rise. The detector electrical rating is 5.0 amps @ 125 VAC and 2.0 amps @ 24 VDC (Resistive). Table 2.4.1 lists the available part numbers and their temperature set-points. Part Number 60-021 60-018 60-038 60-022 C60-007
Temperature Set-point 190°F ( 87.8°C) 225°F (107.1°C) 275°F (134.8°C) 325°F (162.6°C) 450°F (231.9°C) Table 2.4.1
2.4.2 CONTROL MODULES The Control Modules listed below can be used in the Micromist System Controls. 2.4.2.1 FAST RESPONSE CONTACT MODULE ( FRCM ) - P/N 55-019, or 55-020 The FRCM is used to monitor the status of dry contacts for a wide range of applications (e.g. monitoring thermal detectors, manual release stations, low pressure switches, etc.). They can be programmed as various input conditions such as alarm, trouble, supervisory, detection, etc. The module uses an interrupt driven digital protocol to ensure reliable operation. FRCM’s come in either a 4” or shrink wrapped version, depending on the application. The shrink wrapped version, P/N 55-020, is not shown.
2.4.2.2 MINI INPUT MODULE ( MIM ) – P/N 55-030 and ADRESSABLE INPUT MODULE (AIM) - P/N 55-031 The MIM and AIM operate identically. The MIM is a mini version and the AIM mounts to a 4” square backbox. The MIM and AIM are used to monitor the status of dry contacts for a wide range of applications (e.g. monitoring thermal detectors, manual release stations, low pressure switches, etc.). They can be programmed as various input conditions such as alarm, trouble, supervisory, detection, etc., in the same manner as the FRCM. Each provide one, NFPA style B (class B), normally open initiating device circuit and contain a red/green bi-colored L.E.D. which indicates the modules status/condition. Both modules are addressed via user dipswitch settings on the product. The AIM is not shown. 2.4.2.3 SUPERVISED OUTPUT MODULE ( SOM ) - P/N 55-021 The SOM is used to operate notification appliances (e.g. strobes, horns, and bells). The SOM provides one Class B circuit rated for 2.0 amps @ 24 VDC. The SOM maintains important operating parameters in nonvolatile RAM to ensure fast and reliable operation.
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Section 2 / Page 7 of 10 Revision: 2 Revision Date: March, 2008
EQUIPMENT 2.4.2.4 SOLENOID RELEASING MODULE ( SRM ) - P/N 55-022 The SRM is used to operate the Micromist System solenoids during system activation. A single SRM is capable of activating the two 12 VDC solenoids required to activate the Micromist System. The SRM maintains important operating parameters in non-volatile RAM to ensure fast and reliable operation.
2.4.2.5 DUAL RELAY MODULE ( R2M ) - P/N 55-023 The R2M provides two independently configured SPDT relays rated for 2 amps @ 24 VDC, which can be used for a wide variety of applications (e.g. door closures, fuel shutdown, damper closure, generator shutdown, etc.). The R2M maintains important operating parameters in non-volatile RAM to ensure fast and reliable operation.
2.4.3 PRESSURE SWITCH - P/N 02-4550 The Pressure Switch is used to monitor the nitrogen tank pressure. In the event that the supply pressure becomes less than 1,580 psi (10,894 kPa) a signal is sent to the Cheetah Control Panel to alert the user of the problem. The Switch is activated at 1,580 psi (10,894 kPa) and reset when the supply tank(s) are filled above 1,800 psi (12,411kPa). The unit has a 1/2” (15mm) conduit connection and a contact current capacity of 7 amps with an inductance of 4 amps when used with up to 28 VDC. 2.5 MANUAL ACTIVATION All Micromist Systems SHALL have a manual release station provided at every point of egress from the protected space. These stations can be placed inside, or outside, each exit door. Location is subject to the approval of the Authority Having Jurisdiction (AHJ) for the specific project. Manual station(s) shall be wired to a Fast Response Contact Module (FRCM) in the Cheetah Control Panel.
Section 2 / Page 8 of 10 Revision: 2 Revision Date: March, 2008
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EQUIPMENT 2.6 PIPING NETWORK The piping or tube used for a Micromist System shall have a corrosion resistance at least equivalent to piping specified in the following table (excerpted from N.F.P.A. 750). Materials and Dimensions
Standard
Copper Tube (Drawn, Seamless) Copper tube shall have a wall thickness of Type K* or Type L* Standard Specification for Seamless Copper Tube*
ASTM B 75
Standard Specification for Seamless Copper Water Tube*
ASTM B 88
Standard Specification for General Requirements for Wrought Seamless Copper & Copper-Alloy Tube
ASTM B 251
Stainless Steel Standard Specification for Seamless & Welded Austenitic Stainless Steel Tubing for General Service
ASTM A 269
Standard Specification for Seamless & Welded Austenitic Stainless Steel Tubing (Small-Diameter) for General Service
ASTM A 632
Standard Specification for Welded, Unannealed Austenitic Stainless Steel Tubular Products
ASTM A 778
Standard Specification for Seamless & Welded Ferritic/Standard Stainless Steel Tubing (SmallDiameter) for General Service
ASTM A 789 / A789M
*Denotes tube suitable for bending in accordance with ASTM Standards.
Fittings shall have a minimum-rated working pressure equal to or greater than 320 psi @ 130°F (2,206 kPa @ 54°C). 2.7
CAUTION / ADVISORY SIGNS
Signs shall be placed in accordance with NFPA 72 and NFPA 750. 2.7.1
Water Mist Discharge Alarm (Exterior) - P/N 02-10262
This sign explains the presence of horns and/or strobes located outside the protected area. It should be located next to or under audible or visual alarms outside the entrances to that protected area. The sign alerts personnel that the water mist system has discharged and the appropriate actions should be taken. The sign is a 6”x 9” (15.2 cm x 22.9 cm) piece of white plastic with black lettering.
2.7.2
Water Mist System Alarm (Interior) - P/N 02-10263
This sign explains the presence of horns and/or strobes located inside the protected area. It should be located next to or under audible or visual alarms inside the protected area. The sign alerts personnel that the water mist system will discharge and the appropriate actions should be taken. The sign is a 6”x 9” (15.2 cm x 22.9 cm) piece of white plastic with black lettering.
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Section 2 / Page 9 of 10 Revision: 2 Revision Date: March, 2008
EQUIPMENT
2.7.3
Water Mist Caution Sign - P/N 02-10264
This sign should be located next or on the doors that enter the protected area. The sign alerts personnel that all doors should remain closed in the event of a fire. The sign is a 10”x 13” (25.4 cm x 33.0 cm) piece of white plastic with black lettering.
2.7.4
Water Mist System Release - P/N 02-10265
This sign should be located under each manual pull station. The sign identifies the place where the water mist system can be manually discharged. This sign distinguishes the discharge pull station from a fire alarm device. The sign is a 2-1/4” x 4” (5.72 cm x 10.16 cm) piece of red plastic with white lettering.
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WATER MIST EXTINGUISHING SYSTEM RELEASE LIFT AND PULL Fike<
02-10265-NC
F.M. J.I. 3000746
Section 3 Design
DESIGN 3.0 DESIGN This section will detail the steps necessary to design a Micromist System. Your final design must be checked utilizing Fike’s MicroCalc™ pressure drop calculation program, or by performing hand calculations to determine the total pressure drop for the system. Caution: Each application should be equipped with automatic door closures, the air handling system must be shut down, and the fuel MUST be cut off. The lubrication supply should be shutoff as soon as possible. 3.1 ELECTRICAL CLEARANCES All system components (e.g., nozzles, piping, detectors, etc.) shall be located to maintain minimum clearances from unenclosed and uninsulated, energized electrical components in accordance with NFPA 70, National Electrical Code. Refer to NFPA 750, Standard on Water Mist Fire Protection Systems, for further information and clearance data. Warning: Cheetah components (i.e. control panel and control modules) and Micromist skid shall be located outside the protected area, so they are not subject to mechanical, chemical, or other damage that could render them inoperable. 3.2 DETECTOR REQUIREMENTS The specific detector requirements for each system vary according to the hazard requirements. It is because of these variances, that only general guidelines are discussed in this section. It is the responsibility of the system designer to determine the precise location and quantity of detectors required for each individual protected enclosure. 3.2.1 DETECTOR SELECTION Due to the wide range of hazard conditions, selecting the appropriate thermal detector is critical to the proper operation of the Micromist System. When selecting which thermal detector to use, consideration shall be given to normal temperatures incurred during system operation, as well as ventilation inside the protected enclosure. Refer to Section 2.4.1 for recommended detectors. Caution: Field conditions vary from application to application. Therefore, Fike recommends that a site survey be conducted for each application prior to selecting the temperature rating of the thermal detector(s). 3.2.2 DETECTOR QUANTITY AND SPACING The quantity and spacing of detectors shall be installed in accordance with NFPA 72 National Fire Alarm Code, NFPA 750 Standard on Water mist Fire Protection Applications, and the AHJ. The number of thermal detectors required will vary dependant upon the size, shape, and contents of the protected enclosure. A minimum of 2 detectors are required for any enclosure 10 ft x 10 ft (3 m x 3 m) or larger. Note: For Gas Turbine Spaces, additional thermal detectors may be needed near the floor where the fire hazards are present and ventilation would not allow for sufficient build up of heat at ceiling mounted detectors. 3.3 SYSTEM SELECTION The first step in designing a Micromist System is to select the design concept to be used. This decision is based on the type of equipment located within the protected area.
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Section 3/ Page 1 of 13 Revision: 2 Revision Date: March, 2008
DESIGN 3.3.1 MACHINERY SPACE A Machinery Space System is defined as an enclosure housing machinery such as oil pumps or reservoirs, cleaning processes, gear boxes, drive shafts, lubrication skids, diesel engine driven emergency generators, internal combustion engine test cells, or machinery spaces with incidental storage of flammable liquids. x
Refer to Section 3.4 for design calculation details for Machinery Spaces.
3.3.2 GAS TURBINE SPACE A Gas Turbine Space System is defined as an enclosure that houses the turbine portion of an uninsulated or insulated gas turbine. The system is designed to provide 10 minutes of fire protection for the duration of the turbine coast down. In addition, the Micromist system can be used to protect auxiliary turbine rooms (i.e., oil pumps, oil tanks, fuel filters, generators, gear boxes, drive shafts, and lubrication skids, diesel emergency rooms), and other similar machinery spaces (Refer to section 3.4). Where the turbine and auxiliary equipment are housed in the same enclosure, the hazard must be designed as a Gas Turbine Space (Refer to section 3.5). x
Refer to Section 3.5 for design calculation details for Gas Turbine Spaces.
3.4 SYSTEM DESIGN – MACHINERY SPACES Machinery Space Systems are designed to provide 10 minutes of active fire protection. The system is preengineered and consists of nitrogen tank(s), water storage tank, and piping system with a network of discharge nozzles. Machinery Space protection utilizing a Micromist System, is limited to a maximum volume of 9,175 ft3 (260 m3) with a maximum ceiling height of 16 ft. (4.9 m). The volume of the protected space is determined by multiplying: Length x Width x Height.
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DESIGN 3.4.1 NOZZLE LAYOUT – MACHINERY SPACES This section covers the method used to determine the number of Micromist Nozzles required and their location within the protected space. The following are the nozzle placement requirements: x x x x x
Maximum spacing between nozzles is 8 feet (2.4 m) Maximum distance between the wall and a nozzle is 4 feet (1.2 m) Maximum distance between the ceiling and a nozzle is 1 foot (0.3 m) Spacing between the nozzles can be less than 8 feet (2.4 m) Micromist nozzles are arranged in a rectangular grid.
A Typical Micromist System for Machinery Spaces Figure 3.4.1
3.4.1.1 NOZZLE QUANTITY To determine how many nozzles are needed for the length of the room, divide the length of the room by 8 ft. (2.4 m). Round the result up to the next higher whole number. x
Number of nozzles along length dimension = length y 8 ft. (2.4 m)
To determine the number of nozzles required for the width of the room, divide the width of the room by 8 ft. (2.4 m). Round the result up to the next higher whole number. x
Number of nozzles along width dimension = width y 8 ft. (2.4 m)
3.4.1.2 NOZZLE SPACING To determine the nozzle spacing (actual distance between nozzles) for the length of the grid, divide the room length by its required number of nozzles. Nozzle spacing from the end wall to the nearest nozzle is up to half of the distance between nozzles. x x
Distance between nozzles for length dimension = length y number of nozzles along length dimension Distance between nozzles and end wall = distance between nozzles for length dimension y 2
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Section 3/ Page 3 of 13 Revision: 2 Revision Date: March, 2008
DESIGN To determine the distance between nozzles for the width of the grid, divide the room width by its required number of nozzles. Nozzle spacing from the side wall to the nearest nozzle for the width of the room is up to half the distance between nozzles. x x
Distance between nozzles for width dimension = width y number of nozzles along width dimension Distance between nozzles and side wall = distance between nozzles for width dimension y 2
3.4.2 SYSTEM SIZE SELECTION The Water Supply Tank selected must assure that the system has sufficient water to provide active for 10 minutes for the machinery space. x x
Systems with six or less nozzles require a 70 Gallon Micromist System. Systems with seven to nine nozzles require a 112 Gallon Micromist System.
Machinery Spaces that utilize 10 or more nozzles require additional Micromist Systems to achieve the correct water supply for the number of nozzles per system. Each system requires independent piping networks, although a single Cheetah Control Panel can be utilized to control both systems. If the systems piping layouts are not identical, each layout MUST be calculated separately. The maximum protected volume cannot exceed 9,175 ft3 (260 m3) with a maximum ceiling height of 16 ft (4.88 m). 3.4.3 PIPING NETWORK This section covers the calculations required to design the piping for Machinery Spaces. It is intended to give a designer the information required to complete a preliminary piping layout. Strict adherence to the system limitations listed in this section is MANDATORY. Pipe installation SHALL NOT begin until the piping layout has been properly calculated. 3.4.3.1 PIPING LAYOUT Piping layout is an important part of the system design. The piping layout MUST BE designed to provide water to each nozzle in the Micromist System at a pressure of 310 psi r 15 psi (2,137 kPa r 103 kPa). x
The optimal pressure condition is achieved by designing the piping layout to maintain a maximum pressure drop of 20 psi (138 kPa) from the Water Supply Tank to the farthest nozzle.
x
The piping layout must also be designed to maintain a maximum net pressure rise of 5 psi (34.5 kPa). This increase will occur only when the final calculation from elevation changes results in a negative value exceeding the calculated pressure drop of the system.
When the maximum pressure drop to the farthest nozzle is maintained, all nozzles have sufficient pressure and flow to perform within the system design limitations. Stainless steel pipe or tubing, or Copper pipe or tubing, are recommended for use with the Micromist System. The nozzle piping layout does not need to be balanced. The selection of the exact pipe route and connecting the nozzles to one another is left to the discretion of the systems designer. There are several different “correct” piping layouts for every enclosure. Refer to the Sample Problem, Section 4, for examples of four possible piping networks. 3.4.3.2 DETERMINING PIPE SIZE The proper size of each section of piping must be determined for the entire piping network. Working with the piping layout planned per Section 3.4.3.1, determine the smallest, logical, pipe size for each section of the piping network, using the process described below. The piping layout and estimated pipe sizes time are used as a preliminary piping network design. Calculations MUST be made on this preliminary design to confirm that the maximum pressure drop from the Water Storage Tank to the farthest nozzle is less than 20 psi (138 kPa).
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DESIGN 3.4.3.2 DETERMINING PIPE SIZE – Continued x
The nozzle with the maximum pressure drop will usually be the farthest distance away from the Water Storage Tank.
x
If there is any doubt as to which nozzle has the most pressure drop, you MUST perform the calculations for each nozzle in the piping network.
Warning: This is extremely important because it confirms whether or not the preliminary piping network parameters result in adequate pressure to all the nozzles. A. Start with the nozzle farthest from the Water Storage Tank to determine the equivalent pipe length for each section of pipe back to the Water Storage Tank. In order to do this, the following information must be known for each section of the piping network: x x x
Pipe size and length Number and type of fittings in the section of pipe Number of nozzles supplied by the section of pipe
B. The equivalent length for a section of pipe or tubing is determined by adding the straight length of pipe or tubing to the equivalent length of all the fittings in the section. The tables in section 3.6 give the equivalent lengths for fittings that may be found in each section of the piping network. Using these equivalent lengths of pipe, calculate the pressure drop for all the pipe in the longest piping run of the network. To determine the total pressure drop for the longest piping run in the system, multiply the equivalent lengths for each of the different nozzle flows by their corresponding pressure drop factors. These factors are listed in the tables in Section 3.6. C. Add the pressure drop due to any changes in elevation to determine the total pressure drop for the piping run. The pressure change due to a drop or rise in elevation is calculated by multiplying the length of the elevation change by 0.43 psi/ft (1.41 psi/m). Rises, in elevation, increase the pressure drop in a system, and are considered positive. Drops, in elevation, decrease the pressure drop in a system, and are considered negative. D. Verify that the total pressure drop for the longest piping run is within the design limits. If this pressure drop is greater than 20 psi (138 kPa), the preliminary piping network MUST be changed to reduce the equivalent length. Note: Increasing pipe sizes and / or reducing the number of fittings are possible steps that may result in an acceptable pressure drop. 3.5 SYSTEM DESIGN – GAS TURBINE SPACES The Micromist System, for Gas Turbine Spaces, is designed to provide an active fire protection time for a period of 10 minutes. The turbine may use natural gas, or propane gas, as a fuel source. Note that any fuel source SHALL be shutdown prior to discharge of the Micromist System. The system is pre-engineered and consists of nitrogen tanks and a Water Storage Tank. There is also a piping system with a network of discharge nozzles mounted on the end walls of the enclosure. Warning: The nozzle discharge shall be parallel to the axis of the turbine/generator. This is to eliminate any concern of warping or cracking of the turbine casing. Gas Turbine Space protection, utilizing a Micromist System, is limited to a maximum volume of 9,175 ft3 (260 m3) with a maximum ceiling height of 16 ft. The volume of the protected space is determined by multiplying: length x width x height.
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Section 3/ Page 5 of 13 Revision: 2 Revision Date: March, 2008
DESIGN 3.5.1 NOZZLE LAYOUT The nozzle layout for all Micromist Systems Gas Turbine Spaces is predetermined. All systems are preengineered, with the number of nozzles and their positioning as shown in the following paragraphs. 3.5.1.1 NOZZLE QUANTITY The length of the Gas Turbine Space determines the nozzle grid. If the enclosure is 24 feet long, or less, the nozzle grid consists of 6 nozzles positioned as shown below.
The opposite end wall also has 2 nozzles near the top corners of the wall. However, the nozzle near the bottom corner is diagonally opposite the nozzle near the bottom corner of the opposite end wall. One end wall of the enclosure has 2 nozzles near the top corners of the wall and 1 nozzle near one of the bottom corners.
A Typical Micromist System for Gas Turbine Spaces Figure 3.5.1.1 - A If the Gas Turbine Space is longer than 24 feet, the nozzle grid consists of 12 nozzles positioned as shown below. At the midpoint of both side walls, near the ceiling, are 2 nozzles, each pointing to an end wall. Two more are near the floor, diagonally opposite the nozzles near the floor by the end wall. These also point to both end walls.
Nozzles on the end walls are near both of the top corners of the wall and 1 near a bottom corner. Both end walls have the same nozzle sites. All end wall nozzles are directly across the enclosure from each other.
A Typical Micromist System for Larger Dimension Gas Turbine Spaces Figure 3.5.1.1 - B Note: Gas Turbine Space protection utilizing a Micromist System, is limited to a maximum volume of 9,175 ft3 (260 m3) with a maximum ceiling height of 16 ft. This limitation applies to all Gas Turbine Spaces regardless of the length of the side walls.
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DESIGN 3.5.1.2 NOZZLE SPACING The nozzles are located a specific distance from the ceiling, floor and adjacent side walls. The following formula is used to determine the distance from the ceiling down to the upper nozzles. The same formula is used to determine the distance from the floor up to the bottom nozzles. x
Distance from ceiling or floor to adjacent nozzle = 0.26 x height = d1 Note: The units of d1 are the same as height. (For example, if height is measured in ft, d1 is in ft.)
The following formula is used to determine the distance from the adjacent wall to the corresponding nozzles. x
Distance from the side wall to adjacent nozzle = 0.17 x width = d2 Note: The units of d2 are the same as width. (For example, if width is measured in ft, d2 is in ft.)
Refer to Gas Turbine Space Sample Problem, Section 4, for an illustration showing d1 and d2. x 3.5.2
Distance from the end wall to the center nozzles is = 0.5 x length
SYSTEM SIZE SELECTION x
The Micromist System for Gas Turbine Spaces 24 feet long or less utilize 1, 112 Gallon (424 Liter) Micromist System.
x
Gas Turbine Spaces greater than 24 feet long utilize 2, 112 Gallon (424 Liter) Micromist Systems.
3.5.3 PIPING NETWORK This section covers the piping calculations required to design a Micromist System for Gas Turbine Spaces and is intended to give the systems designer the information required to complete a preliminary piping layout. Strict adherence to the system limitations listed in this section is MANDATORY. Pipe installation SHALL NOT begin until the piping layout has been calculated using the following procedure. 3.5.3.1 PIPING LAYOUT For Gas Turbine Spaces the number of nozzles is fixed at 6 per Micromist System. The location of the nozzles with regard to their distance from the walls, floor and ceiling is also fixed, by design based on the dimensions of the enclosure. The piping system supplying the nozzles however is not fixed. The same rule applies for Gas Turbine Space piping systems as does with Machinery Spaces (refer to Section 3.4.3.1). x
The piping layout MUST BE designed to provide water to each nozzle in the Micromist System at a pressure of 310 r 15 psi (2,137 r 103 kPa). This assures that each of the nozzles perform as designed. Maintaining a maximum pressure drop from the Water Supply Tank to the farthest nozzle of no more than 20 psi (138 kPa) does this.
x
The maximum allowable pressure condition is achieved by designing the piping layout to maintain a maximum net pressure rise of 5 psi (34.5 kPa). This increase will occur only when the final calculation from elevation changes results a negative value exceeding the calculated pressure drop of the system.
When the correct maximum pressure drop to the farthest nozzle is maintained, all nozzles have sufficient pressure and flow to perform within system design limitations. Stainless steel tubing, stainless steel pipe, copper pipe, or copper tubing is recommended for use with the Micromist System. (For detailed description, refer to Equipment, Section 2.6). All the nozzles are interconnected with a piping distribution network that is connected to the Water Supply Tank.
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Section 3/ Page 7 of 13 Revision: 2 Revision Date: March, 2008
DESIGN 3.5.3.2 DETERMINING PIPE SIZE To determine the proper size of the piping for the entire piping network, select the smallest logical size for each pipe section in the piping network. The same method is used to determine the total pressure drop for Gas Turbine Spaces as was used for Machinery Spaces. x
If there is any doubt as to which nozzle has the greatest pressure drop, you MUST perform the calculations for each nozzle.
x
Calculations MUST be made to confirm that the maximum pressure drop from the Water Storage Tank to any nozzle is less than 20 psi (138 kPa).
Warning: This is extremely important because it confirms whether or not the preliminary piping network parameters result in adequate pressure to all the nozzles. A. Start with the nozzle farthest from the Water Storage Tank to determine the equivalent pipe length for each section of pipe back to the Water Storage Tank. In order to do this, the following information must be known for each section of the piping network: x x x
Pipe size and length Number and type of fittings in the section of pipe Number of nozzles supplied by the section of pipe
Note: Experience dictates the nozzle used for the maximum pressure drop calculation for Gas Turbine Spaces is the one on the end wall, farthest from the Water Storage Tank and at the ceiling level. Even though the nozzle just below is actually farther away, there is a pressure increase at the lower nozzle location due to the elevation drop. Therefore, the upper nozzle has more pressure drop than the lower. Refer to Sample Problems, Section 4, for an illustration of an example showing the “Selected Nozzle” location. B. The equivalent length for a section of pipe or tubing is determined by adding the straight length of pipe or tubing to the equivalent length of all the fittings in the section. The tables in section 3.6 give the equivalent lengths for fittings that may be found in each section of the piping network. Using these equivalent lengths of pipe, calculate the pressure drop for all the pipe in the longest piping run of the network. To determine the total pressure drop for the longest piping run in the system, multiply the equivalent lengths for each of the different nozzle flows by their corresponding pressure drop factors. These factors are listed in the tables in Section 3.6. C. Add the pressure drop due to any changes in elevation to determine the total pressure drop for the piping run. The pressure change due to a drop or rise in elevation is calculated by multiplying the length of the elevation change by 0.43 psi/ft (1.41 psi/m). Rises, in elevation, increase the pressure drop in a system, and are considered positive. Drops, in elevation, decrease the pressure drop in a system, and are considered negative. D. Verify that the total pressure drop for the piping run to the nozzle with the maximum pressure drop is within the design limits. If this pressure drop is greater than 20 psi (138 kPa), the preliminary piping network MUST be changed to reduce the equivalent length. Note: Increasing pipe sizes and / or reducing the number of fittings are possible steps that may result in an acceptable pressure drop.
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DESIGN 3.6
PRESSURE DROP FACTORS AND EQUIVALENT LENGTHS
3.6.1
COPPER TUBING TABLES SOLDERED COPPER TUBE FITTINGS AND BENDS Equivalent Lengths (ENGLISH UNITS – ft) Tube Size
90° 45° Elbow Bend
90° Bend
(METRIC UNITS – m)
Thru Side Coupling Tee Tee
Tube Size
90° 45° 90° Elbow Bend Bend
Thru Side Coupling Tee Tee
1/2"
1
0.5
0.5
0
0
2
15 mm 0.30
0.15
0.15
0
0
0.61
5/8"
1.5
0.5
1
0
0
2
18 mm 0.46
0.15
0.30
0
0
0.61
3/4"
2
0.5
1
0
0
3
20 mm 0.61
0.15
0.30
0
0
0.91
1"
2.5
0.5
1
0
0
4.5
25 mm 0.76
0.15
0.30
0
0
1.37
1-1/4"
3
1.0
2
0.5
0.5
5.5
32 mm 0.91
0.30
0.61
0.15
0.15
1.68
TYPE L COPPER TUBING Pressure Drop Per Foot of Equivalent Length (psi/ft) Pipe Size 1 Nozzle 2 Nozzles 3 Nozzles 4 Nozzles 5 Nozzles 6 Nozzles 7 Nozzles 8 Nozzles 9 Nozzles 1/2” 5/8” 3/4” 1” 1-1/4”
0.041 0.016 0.007 -------
0.139 0.053 0.024 0.007 ----
0.284 0.107 0.049 0.014 0.005
0.474 0.179 0.081 0.022 0.008
0.707 0.266 0.120 0.033 0.012
---0.368 0.166 0.046 0.017
---0.485 0.219 0.060 0.022
---0.617 0.278 0.076 0.028
---0.763 0.344 0.094 0.034
TYPE L COPPER TUBING Pressure Drop Per Meter of Equivalent Length (kPa/m) Pipe Size 1 Nozzle 2 Nozzles 3 Nozzles 4 Nozzles 5 Nozzles 6 Nozzles 7 Nozzles 8 Nozzles 9 Nozzles 15 mm 18 mm 20 mm 25 mm 32 mm
0.927 0.362 0.158 -------
3.144 1.199 0.543 0.158 ----
6.424 2.420 1.108 0.317 0.113
10.722 4.049 1.832 0.498 0.181
15.993 6.017 2.714 0.746 0.271
---8.324 3.755 1.041 0.385
---10.971 4.954 1.357 0.498
---13.957 6.289 1.719 0.633
---17.260 7.781 2.126 0.769
Note: The pressure drop calculations are based on ASTM B88 Type L Copper Tube minimum internal diameter
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Section 3/ Page 9 of 13 Revision: 2 Revision Date: March, 2008
DESIGN
TYPE K COPPER TUBING Pressure Drop Per Foot of Equivalent Length (psi/ft) Pipe Size 1 Nozzle 2 Nozzles 3 Nozzles 4 Nozzles 5 Nozzles 6 Nozzles 7 Nozzles 8 Nozzles 9 Nozzles 1/2” 5/8” 3/4” 1” 1-1/4”
0.049 0.018 0.009 -------
0.166 0.059 0.031 0.008 ----
0.341 0.120 0.064 0.016 0.005
0.569 0.200 0.106 0.026 0.009
0.850 0.298 0.158 0.039 0.013
---0.413 0.219 0.054 0.018
---0.545 0.288 0.070 0.024
---0.693 0.366 0.089 0.030
---0.858 0.453 0.110 0.037
TYPE K COPPER TUBING Pressure Drop Per Meter of Equivalent Length (kPa/m) Pipe Size 1 Nozzle 2 Nozzles 3 Nozzles 4 Nozzles 5 Nozzles 6 Nozzles 7 Nozzles 8 Nozzles 9 Nozzles 15 mm 18 mm 20 mm 25 mm 32 mm
1.108 0.407 0.204 -------
3.755 1.335 0.701 0.181 ----
7.714 2.714 1.448 0.362 0.113
12.871 4.524 2.398 0.588 0.204
19.228 6.741 3.574 0.882 0.294
---9.342 4.954 1.222 0.407
---12.328 6.515 1.583 0.543
---15.676 8.279 2.013 0.679
---19.408 10.247 2.488 0.837
Note: The pressure drop calculations are based on ASTM B88 Type K Copper Tube minimum internal diameter.
Section 3/ Page 10 of 13 Revision: 2 Revision Date: March, 2008
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DESIGN 3.6.2
STAINLESS STEEEL TUBING TABLES STAINLESS STEEL SWAGELOK£ FITTINGS AND TUBE BENDS Equivalent Lengths (ft) Nominal Size 1/2” 5/8” 3/4” 1” 1-1/4”
Elbows 90q 2 2.5 3 4.5 5
Tee Side
Tee Thru
Coupling
90q Bend
45q Bend
2 2.5 3 4.5 5
0 0 0 0 0.5
0 0 0 0 2
0.5 1 1 1 2
0.5 0.5 0.5 0.5 1
STAINLESS STEEL TUBING Pressure Drop Per Foot of Equivalent Length (psi/ft) Tube Size 1 Nozzle 2 Nozzles 3 Nozzles 4 Nozzles 5 Nozzles 6 Nozzles 7 Nozzles 8 Nozzles 9 Nozzles 1/2" 5/8" 3/4" 1" 1-1/4"
0.329 0.071 0.032 -------
1.120 0.239 0.109 0.022 ----
2.316 0.490 0.223 0.045 0.012
3.895 0.820 0.371 0.075 0.020
5.842 1.224 0.553 0.111 0.030
---1.701 0.768 0.154 0.041
---2.249 1.013 0.202 0.054
---2.866 1.290 0.257 0.068
---3.553 1.597 0.317 0.084
Pressure Drop Per Meter of Equivalent Length (kPa/m) Pipe Size 1 Nozzle 2 Nozzles 3 Nozzles 4 Nozzles 5 Nozzles 6 Nozzles 7 Nozzles 8 Nozzles 9 Nozzles 12 mm 16 mm 20 mm 25 mm 30 mm
7.781 1.968 0.475 -------
26.53 6.673 1.629 0.565 ----
54.88 13.71 3.303 1.131 0.475
92.29 22.94 5.519 1.900 0.792
138.46 34.27 8.211 2.805 1.176
---47.66 11.38 3.981 1.629
---63.02 15.02 5.135 2.149
---80.37 19.11 6.515 2.714
---99.67 23.64 8.05 3.35
STAINLESS STEEL TUBING PROPERTIES Tube Size
Nominal OD
Wall Thickness
Nominal ID
1/2”
1.5
0.065
0.37
5/8”
2
0.065
0.495
3/4”
2
0.083
0.584
1”
2.5
0.095
0.81
1-1/4”
3
0.095
1.06
Note: The above stainless steel tubing is to be in accordance with ASTM 269. The pressure drop calculation is based on the minimum internal diameter. Minimum internal diameter is calculated using an outside diameter equal to the tube size less 0.1 inches and a maximum permitted wall thickness which is 10% greater than the nominal wall thickness.
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Section 3/ Page 11 of 13 Revision: 2 Revision Date: March, 2008
DESIGN
STAINLESS STEEL TUBING PROPERTIES Tube Size
Wall Thickness
Nominal ID
12 mm
1.5
9
16 mm
2
12
20 mm
2
16
25 mm
2.5
20
30 mm
3
24
Note: The above stainless steel tubing is to be in accordance with ASTM 269. The pressure drop calculation is based on an outside diameter equal to tithe tube size less 0.08 mm and a maximum permitted wall thickness equal to 10% greater than the nominal wall thickness.
Section 3/ Page 12 of 13 Revision: 2 Revision Date: March, 2008
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DESIGN 3.6.3
STAINLESS STEEL PIPE TABLES SCHEDULE 40 STAINLESS STEEL THREADED PIPE FITTINGS AND BENDS Equivalent Lengths (ENGLISH UNITS – ft)
(METRIC UNITS – m)
Pipe Size
Union
45q Elbows
90q Elbows
Thru Tee
Side Tee
1/2" 3/4" 1"
0.4 0.5 0.6
0.8 1.0 1.3
1.7 2.2 2.8
1.0 1.4 1.8
3.4 4.5 5.7
15 mm 20 mm 25 mm
1-1/4"
0.8
1.7
3.7
2.3
7.5
32 mm
45q Elbows
90q Elbows
Thru Tee
Side Tee
0.12 0.15 0.18
0.24 0.30 0.40
0.52 0.67 0.85
0.30 0.43 0.55
1.04 1.37 1.74
0.24
0.52
0.13
0.70
2.29
Pipe Size Union
SCHEDULE 40 STAINLESS STEEL PIPE Pressure Drop Per Foot of Equivalent Length (psi/ft) Pipe Size 1 Nozzle 2 Nozzles 3 Nozzles 4 Nozzles 5 Nozzles 6 Nozzles 7 Nozzles 8 Nozzles 9 Nozzles 1/2” 3/4” 1” 1-1/4”
0.023 ----------
0.081 0.020 -------
0.174 0.042 -------
0.300 0.072 0.022 ----
0.460 0.110 0.033 ----
0.653 0.155 0.046 0.012
0.879 0.208 0.061 0.016
1.139 0.269 0.079 0.020
1.432 0.337 0.099 0.025
Note: The thickness of the pipe or tubing wall shall be calculated in accordance with ASME B31.1 Power Piping Code. For Micromist use an internal pressure of 320 psi (2,206 kPa). Mechanical fittings used with stainless steel tubing must be designed for that purpose and have a minimum pressure rating of 320 psi (2,206 kPa).
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Section 3/ Page 13 of 13 Revision: 2 Revision Date: March, 2008
Section 4 Sample Problems
SAMPLE PROBLEMS 4.0 SAMPLE PROBLEMS This section of the manual gives step by step examples of the process and calculations used in the design of Micromist Systems. This design process results in a pre-engineered system designed to comply with all the guidelines and limitations. Sample calculations are given to cover the design of systems for both Machinery Spaces and Gas Turbine Spaces. Note: Some values in the sample problems have been rounded. For accuracy when performing hand calculations, do not round. 4.1
SAMPLE PROBLEMS – MACHINERY SPACES
4.1.1
Problem #1: A machinery space, 26 ft (7.92m) long x 16 ft (4.88m) wide x 16 ft (4.88m) high
4.1.1.1 DETERMINING HAZARD VOLUME Verify the protected volume of the Machinery Space is within system design limits. The volume is determined by multiplying: length x width x height. HAZARD VOLUME (English Units) 26 ft x 16 ft x 16 ft = 6,656 ft3
(Metric Units) 7.92 m x 4.88 m x 4.88 m = 188.61 m3
The volume of the enclosure is within system design limits as it is less than the 9,175 ft3 (260 m3) maximum protected volume allowed for the Micromist System. 4.1.1.2 NOZZLE QUANTITY To determine how many nozzles are needed, divide the room length and width by 8 ft (2.44 m), the maximum spacing allowed between nozzles. Round the result up to the next higher whole number. NUMBER OF NOZZLES REQUIRED (English Units)
(Metric Units)
LENGTH: 26 ft y 8 ft = 3.25 Number of nozzles required for this length = 4
LENGTH: 7.92 m y 2.44 m = 3.25 Number of nozzles required for this length = 4
WIDTH: 16 ft y 8 ft = 2 Number of nozzles required for this width = 2
WIDTH: 4.88 m y 2.44 m = 2 Number of nozzles required for this length = 2
TOTAL NOZZLES 4 (length) x 2 (width) = 8
TOTAL NOZZLES 4 (length) x 2 (width) = 8
4.1.1.3 NOZZLE SPACING To determine the required distance between nozzles, divide the room length/width by the number of nozzles required for the length/width. Divide that number by 2 for the nozzle spacing from the wall to the nearest nozzle. Example of nozzle spacing calculation: From our example with a nozzle quantity of 4 x 2. NOZZLE SPACING (English Units) LENGTH: Nozzle spacing is 26 ft y 4 nozzles = 6.5 ft Spacing from wall to nozzle is 6.5 y 2 = 3.25 ft WIDTH: Nozzle spacing is 16 ft y 2 nozzles = 8.0 ft Spacing from wall to nozzle is 8.0 y 2 = 4.0 ft
F.M. J.I. 3000746
(Metric Units) LENGTH: Nozzle spacing is 7.92 m y 4 nozzles= 1.98 m Spacing from wall to nozzle is 1.98 y 2 = 0.99 m WIDTH: Nozzle spacing is 4.88 m y 2 nozzles= 2.44 m Spacing from wall to nozzle is 2.44 y 2 = 1.22 m
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Section 4 / Page 1 of 24 Revision: 2 Revision Date: March, 2008
SAMPLE PROBLEMS 26'-0" (7.92m)
3'-3" (0.99m)
6'-6" (1.98m)
8'-0" (2.44m)
16'-0" (4.88m)
4'-0" (1.22m)
Problem #1 - Nozzle spacing layout for Machinery Space System Figure 4.1.1.3 4.1.1.4 SYSTEM SIZE SELECTION The number of nozzles determines the size and number of Micromist Systems that are required for a Machinery Space. x x
Nozzle grids containing 6 or less nozzles require a 70 Gallon (265 Liter) Micromist System. Nozzle grids containing 7 to 9 nozzles require a 112 Gallon (424 Liter) Micromist System.
Our example has 8 nozzles. Therefore, a 112 Gallon (424 Liter) Micromist System is required. 4.1.1.5 PIPING LAYOUT After the number and location of the nozzles has been determined, they must be connected with a piping network that provides the nozzles with the proper flow and pressure. There are several “correct” layouts for every enclosure. Figure 4.1.1.5 shows four possible piping networks for the example.
Arrangement A
Arrangement B
Arrangement C
Arrangement D
Possible Piping Arrangements Figure 4.1.1.5 Once the piping arrangement has been chosen, the network must be connected to the water storage tank. For Problem #1, we have selected the piping layout “Arrangement D”, in Figure 4.1.1.5. Section 4 / Page 2 of 24 Revision: 2 Revision Date: March, 2008
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SAMPLE PROBLEMS 4.1.1.6 DETERMINING PIPE SIZE The pipe size for the entire piping system is first estimated, then calculated to assure proper pressure will be supplied to the nozzles. Choose the pipe type and estimate pipe sizes for each section of piping. For Problem #1, Copper Tubing “Type L” was selected with the lengths and sizes as shown in Figure 4.1.1.6.
1 " 1/2 " 6 ' 62 " 1/2 " 6 ' 6-
5 " 5/8 6" 6'-
" 5/8 " 8 ' 1-
" 1/2 " 10 4'3/4 5-1 " 1"
8
3/4"
4 5/8 " 8'0"
6
11'-4"
" 5/8 " 0 1'-
3 " 1/2 " 6 6'-
" 1/2 " 6 ' 6-
" 5/8 " 0 1'-
" 3/4 0" 2'-
Problem #1 - Machinery Space Nozzle Piping System Figure 4.1.1.6
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Section 4 / Page 3 of 24 Revision: 2 Revision Date: March, 2008
SAMPLE PROBLEMS 4.1.1.6 DETERMINING PIPE SIZE (CONTINUED) Starting at the nozzle farthest from the Water Storage Tank, determine the equivalent length of each Node. The equivalent length for each Node is determined by adding the straight lengths of pipe and the equivalent lengths of all the fittings in the Node. These equivalent lengths are taken from Section 3.6. The section of pipe supplying the farthest nozzle consists of a 6’-6” (1.98 m) length of 1/2” (15 mm) pipe. The fittings are a 1/2” (15 mm) thru tee and a 1/2” (15 mm) 90q elbow. Therefore, the equivalent length for this first pipe Node is: NODE 1 Single Nozzle Flow – (English Units) Single Nozzle Flow – (Metric Units) 1.98 m of 15 mm pipe = 1.98 m 6’-6” of 1/2” pipe = 6.50 ft 1pc. 15 mm 90q elbow = 0.30 m 1pc. 1/2” 90q elbow = 1.00 ft 1pc. 15 mm thru tee = 0.00 m 1pc. 1/2” thru tee = 0.00 ft Total = 7.5 ft Total = 2.28 m Note: The thru tee is counted in this section because the water flowing thru this tee supplies a single nozzle. Proceed to the next Node. This Node is supplying 2 nozzles. It has a 6’-6” (1.98 m) length of 1/2” (15 mm) pipe. The fitting is a 1/2” (15 mm) thru tee. Therefore, the equivalent lengths are: NODE 2 2 Nozzle Flow – (English Units) 6’-6” of 1/2” pipe = 6.50 ft 1pc. 1/2” thru tee = 0.00 ft Total = 6.5 ft
2 Nozzle Flow – (Metric Units) 1.98 m of 15 mm pipe = 1.98 m 1pc. 15 mm thru tee = 0.00 m Total = 1.98 m
The next calculation is for the 3 nozzle flow: The pipe is a 6’-6” (1.98 m) length of 1/2” (15 mm) pipe. The fitting is a 1/2” thru tee. The equivalent lengths are: NODE 3 3 Nozzle Flow – (English Units) 6’-6” of 1/2” pipe = 6.50 ft 1pc. 1/2” thru tee = 0.00 ft Total = 6.5 ft
3 Nozzle Flow – (Metric Units) 1.98 m of 15 mm pipe = 1.98 m 1pc. 15 mm thru tee = 0.00 m Total = 1.98 m
The next Node has 4 nozzle flow. The pipe is 2 x 1’-0” (.30 m) lengths of 5/8” (18 mm) pipe and an 8’-0” (2.44 m) section of 5/8” (18 mm) pipe, for a total of 10’-0” (3.05 m). Fittings consist of 2 x 1/2” (15 mm) 90q elbows and a 1/2 x 5/8” x 1/2” (15 mm x 18 mm x 15 mm) thru tee. The equivalent lengths are: NODE 4 4 Nozzle Flow – (English Units) 10’-0” of 5/8” pipe = 10.0 ft 2pc. 5/8” 90q elbows = 2.00 ft 1pc. 5/8” thru tee = 0.00 ft Total = 12. ft
Section 4 / Page 4 of 24 Revision: 2 Revision Date: March, 2008
4 Nozzle Flow – (Metric Units) 3.05 m of 18 mm pipe = 3.05 m 2pc. 18 mm 90q elbows = 0.61 m 1pc. 18 mm thru tee = 0.00 m Total = 3.66 m
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SAMPLE PROBLEMS 4.1.1.6 DETERMINING PIPE SIZE (CONTINUED) The next Node has 5 nozzle flow. The pipe is a 6’-6” (1.98 m) length of 5/8” (18 mm) pipe. The fitting is a 5/8” (18 mm) thru tee. The equivalent lengths are: NODE 5 5 Nozzle Flow – (English Units) 6’-6” of 5/8” pipe = 6.50 ft 1pc. 5/8” thru tee = 0.00 ft Total = 6.5 ft
5 Nozzle Flow – (Metric Units) 1.98 m of 18 mm pipe = 1.98 m 1pc. 18 mm thru tee = 0.00 m Total = 1.98 m
The next Node has 6 nozzle flow. The pipe is a 1’-8” (0.51 m) length of 5/8” (18 mm) pipe. The fitting is a 5/8” x 1/2” x 1” (18 mm x 20 mm x 25 mm) side tee. The equivalent lengths are: NODE 6 6 Nozzle Flow – (English Units) 1’-8” of 5/8” pipe = 1.67 ft 1pc. 5/8” side tee = 2.00 ft Total = 3.67 ft
6 Nozzle Flow – (Metric Units) 0.51 m of 18 mm pipe = 0.51 m 1pc. 18 mm side tee = 0.61 m Total = 1.12 m
The last Node has 8 nozzle flow. The pipe is a 19’-3” (5.87 m) length of 1” (25 mm) pipe. The fittings are 2 - 1” (20 mm) x 90q elbows. The equivalent lengths are: NODE 8 8 Nozzle Flow – (English Units) 19’-3” of 1” pipe = 19.25 ft 2pc. 1” 90q elbows = 5.00 ft Total = 24.25 ft
8 Nozzle Flow – (Metric Units) 5.87 m of 25 mm pipe = 5.87 m 2pc. 25 mm 90q elbows = 1.52 m Total = 7.39 m
Now, calculate the total pressure drop for the piping system. The equivalent lengths calculated above are each multiplied by their appropriate pressure drop factor, found in Section 3.6 of the Design Section. The pressure drop calculation for Problem #1 is shown below. PRESSURE DROP (English Units) 1/2” @ Node 1 – 7.5’ x 0.041 psi/ft 1/2” @ Node 2 – 6.5’ x 0.139 psi/ft 1/2” @ Node 3 – 6.5’ x 0.284 psi/ft 1/2” @ Node 4 – 12’ x 0.474 psi/ft 5/8” @ Node 5 – 6.5’ x 0.266 psi/ft 5/8” @ Node 6 – 3.67’ x 0.368 psi/ft 1” @ Node 8 – 24.25’ x 0.076 psi/ft Pressure Drop (psi)
F.M. J.I. 3000746
(Metric Units) = 0.31 = 0.90 = 1.85 = 5.69 = 1.73 = 1.35 = 1.84 = 13.7
15mm @ Node 1 – 2.28m x 0.93 kPa/m 15mm @ Node 2 – 1.98m x 3.14 kPa/m 15mm @ Node 3 – 1.98m x 6.42 kPa/m 15mm @ Node 4 – 3.66m x 10.7 kPa/m 18mm @ Node 5 – 1.98m x 6.02 kPa/m 18mm @ Node 6 – 1.12m x 8.32 kPa/m 25mm @ Node 8 – 7.39m x 1.72 kPa/m Pressure Drop (kPa)
Micromist£ Manual P/N: 06-153
= 2.12 = 6.22 = 12.7 = 39.2 = 11.9 = 9.32 = 12.7 = 94.2
Section 4 / Page 5 of 24 Revision: 2 Revision Date: March, 2008
SAMPLE PROBLEMS 4.1.1.6 DETERMINING PIPE SIZE (CONTINUED) The final consideration is the pressure drop/rise due to elevation changes. Pressure is changed 0.43 psi/ft (9.72 kPa/meter) of drop/rise. The net elevation change in our example is an 11.33 ft (3.45 m) rise. Multiply the net elevation change by 0.43 psi/ft (9.73 kPa/meter). If the calculated nozzle is higher than the water container outlet, add the answer to the calculated pressure drop. If the nozzle is lower, subtract the two numbers. ELEVATION CHANGE (TOTAL SYSTEM PRESSURE DROP) (English Units) 11.33 ft x 0.43 psi/ft = 4.87 psi + 13.7 psi =
4.87 psi 18.57 psi
(Metric Units) 3.45 m x 9.73 kPa/m = 33.57 kPa 33.57 kPa + 94.2 kPa = 127.77 kPa
Therefore, our example system meets the requirement of a total pressure drop less than 20 psi (137.9 kPa). 4.1.2
Problem #2 - A machinery space, 25 ft (7.62m) long x 16 ft (4.88m) wide x 16 ft (4.88m) high (Volume 1) with a 8 ft (2.44 m) long x 7 ft (2.13 m) wide x 16 ft (4.88 m) high section (Volume 2).
4.1.2.1 DETERMINING THE HAZARD VOLUME Verify the protected volume of the Machinery Space is within design limits. The volume is determined by multiplying: length x width x height. HAZARD VOLUME (English Units) (Metric Units) 3 25 ft x 16 ft x 16 ft = 6,400 ft – (Volume 1) 7.62 m x 4.88 m x 4.88 m = 181.47 m3 – (Volume 1) 3 8 ft x 7 ft x 16 ft = 896 ft – (Volume 2) 2.44 m x 2.13 m x 4.88 m = 25.36 m3 – (Volume 2) TOTAL VOLUME = 6,400 ft3 + 896 ft3 = 7,296 ft3
TOTAL VOLUME = 181.47 m3 + 25.36 m3 = 206.83 m3
The volume of the enclosure is within design limits as it is less than the 9,175 ft3 (260 m3) maximum protected volume allowed for the Micromist System.
Section 4 / Page 6 of 24 Revision: 2 Revision Date: March, 2008
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SAMPLE PROBLEMS 4.1.2.2 NOZZLE QUANTITY To determine how many nozzles are needed for the room, divide the length and width of the room by 8 ft (2.44 m), the maximum spacing allowed between nozzles. Round the result up to the next higher whole number. NUMBER OF NOZZLES REQUIRED (English Units)
(Metric Units) Volume 1
LENGTH: 25 ft y 8 ft = 3.125 Number of nozzles required for this length = 4 WIDTH: 16 ft y 8 ft = 2 Number of nozzles required for this width = 2 Total Nozzles for Volume 1 (V1):
4x2 =
LENGTH: 7.62 m y 2.44 m = 3.12 Number of nozzles required for this length = 4 WIDTH: 4.88 m y 2.44 m = 2 Number of nozzles required for this length = 2 8
Total Nozzles for Volume 1 (V1):
4x2 =
8
Volume 2 LENGTH: 8 ft y 8 ft = 1 Number of nozzles required for this length = 1
LENGTH: 2.44 m y 2.44 m = 1 Number of nozzles required for this length = 1
WIDTH: 7 ft y 8 ft = 0.875 Number of nozzles required for this width = 1
WIDTH: 2.13 m y 2.44 m = 0.873 Number of nozzles required for this length = 1
Total Nozzles for Volume 2 (V2): TOTAL NOZZLES (V1 + V2):
1x1 = =
1
8+1 = 9
Total Nozzles for Volume 2 (V2): TOTAL NOZZLES (V1 + V2):
1x1 = =
1
8+1 = 9
4.1.2.3 NOZZLE SPACING To determine the required distance between nozzles, divide the room length/width by the number of nozzles required for the length/width. Divide that number by 2 for the nozzle spacing from the wall to the nearest nozzle. Example of nozzle spacing calculation: From our example with a nozzle quantity of 4 x 2 and 1 x 1. NOZZLE SPACING Volume 1 (English Units) (Metric Units) LENGTH: Nozzle spacing is 26 ft y 4 nozzles = 6.5 ft LENGTH: Nozzle spacing is 7.92 m y 4 nozzles = 1.98 m Spacing from wall to nozzle is 6.5 y 2 = 3.25 ft Spacing from wall to nozzle is 1.98 y 2 = 0.99 m WIDTH: Nozzle spacing is 16 ft y 2 nozzles = 8.0 ft WIDTH: Nozzle spacing is 4.88 m y 2 nozzles = 2.44 m Spacing from wall to nozzle is 8.0 y 2 = 4.0 ft Spacing from wall to nozzle is 2.44 y 2 = 1.22 m Volume 2 LENGTH: Nozzle spacing is 8 ft y 1 nozzle = 8.0 ft LENGTH: Nozzle spacing is 2.44 m y 1 nozzle = 2.44 m Spacing from wall to nozzle is 8 y 2 = 4.0 ft Spacing from wall to nozzle is 2.44 y 2 = 1.22 m WIDTH: Nozzle spacing is 7 ft y 1 nozzle = 7.0 ft WIDTH: Nozzle spacing is 2.13 m y 1 nozzle = 2.13 m Spacing from wall to nozzle is 7.0 y 2 = 3.5 ft Spacing from wall to nozzle is 2.13 y 2 = 1.07 m
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Section 4 / Page 7 of 24 Revision: 2 Revision Date: March, 2008
SAMPLE PROBLEMS 4'-0" (2.44m)
6'-3" (1.91m)
3' 1-1/2" (0.95m)
8'-0" (4.88m)
4'-0" (2.44m) (1.07m) 3'-6"
Problem #2 - Nozzle spacing layout for Machinery Space System Figure 4.1.2.3 4.1.2.4 SYSTEM SIZE SELECTION The number of nozzles determines the size and number of Micromist Systems that are required for a Machinery Space. x x
Nozzle grids containing 6 or less nozzles require a 70 Gallon (265 Liter) Micromist System. Nozzle grids containing 7 to 9 nozzles require a 112 Gallon (424 Liter) Micromist System.
Our example has 9 nozzles. Therefore, a 112 Gallon (424 Liter) Micromist System is required. 4.1.2.5 PIPING LAYOUT After the number and location of the nozzles has been determined, they must be connected with a piping network that provides the nozzles with the proper flow and pressure. There are several “correct” layouts for every enclosure. Figure 4.1.2.5 shows four possible piping networks for Problem #2.
Arrangement A
Arrangement B
Arrangement C
Arrangement D
Possible piping layouts Figure 4.1.2.5 Once the piping layout has been chosen, the network must be connected to the water storage tank. For this example, we have selected the piping layout “Arrangement A” in Figure 4.1.2.5. 4.1.2.6 DETERMINING PIPE SIZE Section 4 / Page 8 of 24 Revision: 2 Revision Date: March, 2008
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SAMPLE PROBLEMS The pipe size for the entire piping system is first estimated, then calculated to assure proper pressure will be supplied to the nozzles. Choose the pipe type and estimate pipe sizes for each section of piping. For Problem #2, Stainless Steel Tubing was selected with the lengths and sizes as shown in Figure 4.1.2.6.
/4" 1-1 -4" 6' " 5/8 3" ' 6-
9
/4" 1-1 0" '12
1-1 /4" 4'9"
1" " 0 1'-
" 5/8 " 3 6'-
" 3/4 " 3 ' 6
5 1" 8'0"
/4" 1-1 -0" 2'
" 5/8 0" 1'2 " 5/8 3" 5'-
3 " 5/8 " 3 ' 6
1 1/2 " 7'6"
/4" 4 3 3" 6'-
1" " 0 1'-
Problem #2 - Example of Machinery Space Nozzle Piping System Figure 4.1.2.6
F.M. J.I. 3000746
Micromist£ Manual P/N: 06-153
Section 4 / Page 9 of 24 Revision: 2 Revision Date: March, 2008
SAMPLE PROBLEMS 4.1.2.6 DETERMINING PIPE SIZE (CONTINUED) Starting at the nozzle farthest from the Water Storage Tank, determine the equivalent length of each section of pipe. The equivalent length for a section of pipe is determined by adding the straight length of pipe to the equivalent length of all the fittings in the section. These equivalent lengths are taken from Section 3.6. The section of pipe supplying the farthest nozzle consists of a 7’-6” (2.29 m) length of 1/2” (15 mm) pipe. The fittings are a 1/2” (15 mm) 90q elbow and a 5/8” x 1/2” x 1/2” (18mm x 15mm x 15mm) side tee. Therefore, the equivalent length for this first pipe section is: NODE 1 Single Nozzle Flow – (English Units) 7’-6” of 1/2” pipe = 7.50 ft 1pc. 1/2” 90q elbow = 2.00 ft 1pc. 1/2” side tee = 2.00 ft Total = 11.5 ft
Single Nozzle Flow – (Metric Units) 2.29 m of 15 mm pipe = 2.29 m 1pc. 15 mm 90q elbow = 0.61 m 1pc. 15 mm side tee = 0.61 m Total = 3.51 m
Note: The side tee is counted in this section because the water flowing thru it supplies a single nozzle. Proceed to the next section of pipe. This section is supplying 2 nozzles. This section has a 5’-3” (1.60 m) length of 5/8” (18 mm) pipe. The fitting is a 5/8” (18 mm) thru tee. Therefore, our equivalent lengths are: NODE 2 2 Nozzle Flow – (English Units) 5’-3” of 5/8” pipe = 5.25 ft 1pc. 5/8” thru tee = 0.00 ft Total = 5.25 ft
2 Nozzle Flow – (Metric Units) 1.60 m of 18 mm pipe = 1.60 m 1pc. 18 mm thru tee = 0.00 m Total = 1.60 m
The next calculation is for the 3 nozzle flow: The pipe is a 6’-3” (1.91 m) length of 5/8” (18 mm) pipe. The fitting is a 3/4” x 5/8” x 1/2” (20mm x 18mm x 15mm) thru tee. The equivalent lengths are: NODE 3 3 Nozzle Flow – (English Units) 6’-3” of 5/8” pipe = 6.25 ft 1pc. 5/8” thru tee = 0.00 ft Total = 6.25 ft
3 Nozzle Flow – (Metric Units) 1.91 m of 18 mm pipe = 1.91 m 1pc. 18 mm thru tee = 0.00 m Total = 1.91 m
The next pipe section has 4 nozzle flow. This section has a 6’-3” (1.91 m) length of 3/4” (20 mm) pipe. The fitting is a 1” x 3/4” x 1/2” (25mm x 20mm x 15mm) thru tee. The equivalent lengths are: NODE 4 4 Nozzle Flow – (English Units) 6’-3” of 3/4” pipe = 6.25 ft 1pc. 1” thru tee = 0.00 ft Total = 6.25 ft
Section 4 / Page 10 of 24 Revision: 2 Revision Date: March, 2008
4 Nozzle Flow – (Metric Units) 1.91 m of 20 mm pipe = 1.91 m 1pc. 25 mm thru tee = 0.00 m Total = 1.91 m
Micromist£ Manual P/N: 06-153
F.M. J.I. 3000746
SAMPLE PROBLEMS 4.1.2.6 DETERMINING PIPE SIZE (CONTINUED) The next pipe section has 5 nozzle flow. The pipe section is a 1’-0” (0.30 m) length and a 8’-0” (2.44 mm) length of 1” (25 mm) pipe, for a total length of 9’-0” (2.74 m). The fittings are a 1” (25 mm) 90q elbow and a 1-1/4” x 1” x 1” (32 mm x 25 mm x 25 mm) thru tee. The equivalent lengths are: NODE 5 5 Nozzle Flow – (English Units) 9’-0” of 1” pipe 1pc. 1” 90q elbow 1pc. 1” thru tee Total
= = = =
5 Nozzle Flow – (Metric Units) 2.74 m of 25 mm pipe 1pc. 25 mm 90q elbow 1pc. 32 mm thru tee Total
9.00 ft 4.50 ft 0.00 ft 13.5 ft
= = = =
2.74 m 1.37 m 0.00 m 4.11 m
The next pipe section has 9 nozzle flow. The pipe section is a 4’-9” (1.45 m) length, a 12’-0” (3.66 mm) length, a 6’-4” (1.93 m) length, and a 2’-0” (0.61 m) length of 1-1/4” (32 mm) pipe, for a total length of 25’-1” (7.65 m). The fittings are 3 x 1-1/4” (32mm) x 90q elbows. The equivalent lengths are: NODE 9 9 Nozzle Flow – (English Units) 25’-1” of 1-1/4” pipe = 25.08 ft 3pc. 1-1/4” 90q elbows = 15.00 ft Total = 40.08 ft
9 Nozzle Flow – (Metric Units) 7.64 m of 32 mm pipe = 7.64 m 3pc. 32 mm 90q elbows = 4.57 m Total = 12.21 m
Now, calculate the total pressure drop for the piping system. The equivalent lengths calculated above are each multiplied by their appropriate pressure drop factor, found in paragraph 2.2.2.2 of the Design Section. The pressure drop calculation for Problem #2 is shown below. PRESSURE DROP (English Units)
(Metric Units)
1/2” @ 1 nozzle flow – 11.50’ x 0.33 psi/ft = 3.80 5/8” @ 2 nozzle flow – 5.25’ x 0.24 psi/ft = 1.26 5/8” @ 3 nozzle flow – 6.25’ x 0.49 psi/ft = 3.06 3/4” @ 4 nozzle flow – 6.25’ x 0.371 psi/ft = 2.32 1” @ 5 nozzle flow – 13.5’ x 0.111 psi/ft = 1.50 1-1/4” @ 9 nozzle flow - 40.08’ x 0.08 psi/ft = 3.21 Pressure Drop (psi) = 15.15
15mm @ 1 nozzle flow – 3.51m x 7.44 m/kPa 15mm @ 1 nozzle flow – 1.60m x 5.41 m/kPa 16mm @ 1 nozzle flow – 1.91m x 11.1 m/kPa 16mm @ 2 nozzle flow – 1.91m x 8.39 m/kPa 16mm @ 3 nozzle flow – 4.11m x 2.51 m/kPa 32mm @ 9 nozzle flow - 12.2m x 1.90 m/kPa Pressure Drop (kPa)
= 26.11 = 8.66 = 21.20 = 16.02 = 10.32 = 23.18 = 105.5
The final consideration is the pressure drop/rise due to elevation changes. Pressure changes by 0.43 psi/ft (9.73 kPa/meter) of drop/rise. The net elevation change in our example is a 6.33 ft (1.93 m) rise. Multiply the net elevation change by 0.43 psi/ft (9.73 kPa/meter). If the calculated nozzle is higher than the water container outlet, add the answer to the calculated pressure drop. If the nozzle is lower, subtract the two numbers. ELEVATION CHANGE (TOTAL SYSTEM PRESSURE DROP) (English Units) 6.33 ft x 0.43 psi/ft 15.15 psi + 2.72 psi
= 2.72 psi = 17.87 psi
(Metric Units) 1.93 m x 9.73 kPa/m = 18.87 kPa 105.5 kPa + 18.78 kPa = 124.3 kPa
Therefore, Problem #2 meets the requirement of a total pressure drop less than 20 psi (137.9 kPa).
F.M. J.I. 3000746
Micromist£ Manual P/N: 06-153
Section 4 / Page 11 of 24 Revision: 2 Revision Date: March, 2008
SAMPLE PROBLEMS 4.2
SAMPLE PROBLEMS – GAS TURBINE SPACES
4.2.1
Problem #1: A gas turbine space, 24 ft (7.32m) long x 23’-9” ft (7.24m) wide x 16 ft (4.88m) high.
4.2.1.1 DETERMINING HAZARD VOLUME The first calculation required in the design of a Micromist System for Gas Turbine Spaces is to determine the volume of the space being protected. x
Check length and width to confirm at least 1 enclosure dimension does not exceed 24 ft. (7.32m).
The 24 ft (7.32m) length and 23.75 ft (7.23m) width are both less than 24ft. x x
The volume is determined by multiplying: length x width x height. Volume = 24 ft x 23.75 ft x 16 ft = 9,120 ft3 (7.32m x 7.23m x 4.88m = 258.3m3)
The volume of the enclosure is less than the 9,175 ft3 (260 m3) maximum protected volume allowed for the Micromist System. 4.2.1.2 NOZZLE QUANTITY The nozzle grid for Gas Turbine Spaces is predetermined. All Micromist Systems for Gas Turbine Spaces consist of six nozzles. If the room is 24 ft. long or less, 1 system with 6 nozzles is required. If the room is greater than 24 ft. in one direction then 2 systems with 12 nozzles are required. Since both dimensions for Problem #1 are 24 ft. or less then, 1 system with 6 nozzles is required.
Section 4 / Page 12 of 24 Revision: 2 Revision Date: March, 2008
Micromist£ Manual P/N: 06-153
F.M. J.I. 3000746
SAMPLE PROBLEMS 4.2.1.3 NOZZLE SPACING Calculate the distance from the ceiling down to the upper nozzles. The same formula is used to determine the distance from the floor up to the bottom nozzles. The opposite end wall also has two nozzles near the top corners of the wall. The nozzle near the bottom corner is diagonally opposite the nozzle near the bottom corner of the opposite end wall.
d1
h
d1 d2 d2
l
w One end wall of the enclosure has two nozzles near the top corners of the wall and one nozzle near one of the bottom corners. Gas Turbine Nozzle Spacing Figure 4.2.1.3
DISTANCE FROM CEILING AND FLOOR (English Units) Distance: ceiling to upper nozzle And floor to lower nozzle d1 = 0.26 x h d1 = 0.26 x 16ft = 4.16ft # 4’-2”
F.M. J.I. 3000746
(Metric Units) Distance: ceiling to upper nozzle And floor to lower nozzle d1 = 0.26 x h d1 = 0.26 x 4.88m = 1.27m # 1.26m
Micromist£ Manual P/N: 06-153
Section 4 / Page 13 of 24 Revision: 2 Revision Date: March, 2008
SAMPLE PROBLEMS Calculate the distance from the wall to adjacent nozzles. DISTANCE FROM WALL (English Units) Distance: Wall to adjacent nozzle d2 = 0.17 x w d2 = 0.17 x 23.75ft = 4.038ft # 4’0-1/2”
(Metric Units) Distance: Wall to adjacent nozzle d2 = 0.17 x w d2 = 0.17 x 7.24m = 1.23m # 1.24m
4.2.1.4 PIPING LAYOUT Calculations must be made to verify that the water will be delivered to the nozzles at the correct pressure.
1 1/2 " 14 '-2 "
2
5/ 1'- 8" 6"
4'2"
5/ 4'0 8" -1/ 2"
1/ 1'- 2" 6"
3 " 5/8 " '- 0 15
5/8 14 " '-2 "
1/ 7'- 2" 8"
1" 6" 2'-
4'2" 4'0 -1/ 2"
1/2 1'- " 6" 1/2 1'- " 6"
1/ 1'- 2" 6"
" 5/8 " 0 9'5/8 1" " 4'0 6" -1/ 5'2"
1" 0" 4'6
1" 0" 1'-
Problem #1 - Example of Turbine Generator Nozzle Piping System Figure 4.1.2.4 It is now possible to determine our piping system sizing to supply these nozzles. Figure 3.8 illustrates a possible piping arrangement for the example enclosure.
4.2.1.5
DETERMINING PIPE SIZE
Section 4 / Page 14 of 24 Revision: 2 Revision Date: March, 2008
Micromist£ Manual P/N: 06-153
F.M. J.I. 3000746
SAMPLE PROBLEMS The same method is used to determine the total pressure drop for Gas Turbine Spaces as was used for Machinery Spaces. In this example, the selected nozzle, or the nozzle to be calculated will be one that is on the end wall near the Water Storage Tank, but farthest from the tank. The lower nozzle is actually farther away, however, there will be a pressure increase gained at this nozzle due to the elevation drop to the nozzle. Therefore, the upper nozzle will have the greater pressure drop. If you are uncertain as to which nozzle is the worst case, you must perform the calculations for each nozzle. This example will use Copper “Type L” Tubing. Refer to section 2.2.3.2 for the table of Equivalent Lengths of Soldered Pipe Fittings and Bends for the values used in the calculations below. This calculation is made in order to determine the equivalent length of the piping that connects the selected nozzle to the Water Storage Tank. The equivalent length for a section of pipe is determined by adding the straight length of pipe to the equivalent length of all the fittings in the section. Begin with the section of pipe directly connected to the selected nozzle and proceed with the calculations for each pipe section all the way to the Water Storage Tank. The first section of pipe supplying the selected nozzle consists of a 14’-2” (4.32m) length of 1/2” (15 mm) pipe as well as a 1/2” (15 mm) x 1/2” (15 mm) x 1/2” (15 mm) thru tee and a 1/2” (15 mm) 90q elbow. The equivalent pipe length for the first pipe section is tabulated below: NODE 1 Single Nozzle Flow – (English Units) 14’-2” of 1/2” pipe 1pc. 1/2”, 90q elbow 1pc. 1/2” thru tee Total
Single Nozzle Flow – (Metric Units) 4.32 m of 15 mm pipe 1pc. 15 mm, 90q elbow 1pc. 16 mm thru tee Total
= 14.17 ft = 1.00 ft = 0.00 ft = 15.17 ft
= = = =
4.32 m 0.31 m 0.00 m 4.63 m
Note: The thru tee is counted in this section because the water flowing thru it supplies a single nozzle. Now proceed to the next section of pipe. This section is supplying 2 nozzles and consists of a 1’-6” (0.46 m) length of 1/2” (15 mm) pipe as well as a 1/2” (15 mm) thru tee. Therefore, our equivalent lengths are: NODE 2 2 Nozzle Flow – (English Units) 1’-6” of 1/2” pipe = 1pc. 1/2” thru tee = Total =
2 Nozzle Flow – (Metric Units)
1.5 ft 0.0 ft 1.5 ft
0.46 m of 15 mm pipe 1pc. 15 mm thru tee Total
= = =
0.46 m 0.00 m 0.46 m
Our next section of pipe is for the 3 nozzle flow: NODE 3 3 Nozzle Flow – (English Units) 19’ 0-1/2” of 1/2” pipe 1pc. 1/2” 90q elbow 1pc. 1/2” side tee Total
= = = =
19.04 ft 1.50 ft 2.00 ft 22.54 ft
3 Nozzle Flow – (Metric Units) 5.80 m of 15 mm pipe 1pc. 15 mm 90q elbow 1pc. 15 mm side tee Total
= = = =
5.80 m 0.31 m 0.61 m 6.72 m
4.1.2.5 DETERMINING PIPE SIZE (Continued) F.M. J.I. 3000746
Micromist£ Manual P/N: 06-153
Section 4 / Page 15 of 24 Revision: 2 Revision Date: March, 2008
SAMPLE PROBLEMS The last section of pipe is for 6 nozzle flow: NODE 6 6 Nozzle Flow - (English Units) 13’-0” of 1” pipe 3pc. 1” 90q elbows Total
= = =
6 Nozzle Flow – (Metric Units) 3.96 m of 20 mm pipe = 1pc. 20 mm 90q elbows = Total =
13.0 ft 7.5 ft 20.5 ft
3.96 m 2.29 m 6.25 m
To determine the pressure drop for the piping system, we multiply the equivalent lengths for each of the different nozzle flows by their corresponding pressure drop factors. The pressure drop for each nozzle flow in our example is calculated below: Pressure Drop (English Units) 1/2” @ 1 nozzle flow 1/2” @ 2 nozzle flow 1/2” @ 3 nozzle flow 3/4” @ 6 nozzle flow
(Metric Units)
– 15.17’ x 0.04 psi/ft – 1.5’ x 0.139 psi/ft – 22.54’ x 0.28 psi/ft – 20.5’ x 0.166psi/ft (Pressure Drop) psi
= 0.62 = 0.21 = 6.31 = 3.40 = 10.54
15mm @ 1 nozzle flow 15mm @ 2 nozzle flow 16mm @ 3 nozzle flow 20mm @ 6 nozzle flow
– – – –
4.63m x 0.90 kPa/m 0.46m x 3.14 kPa/m 6.72m x 6.33 kPa/m 6.25m x 3.76 kPa/m (Pressure Drop) kPa
= = = = =
4.17 1.44 42.5 23.5 71.6
The final consideration is the change in system pressure due to elevation. Pressure changes by 0.43 psi/ft (9.72 kPa/m) of drop/rise. The net elevation change in our example is a 5.5 ft (1.68 m) rise. Multiply the net elevation change by 0.43 psi/ft (9.72 kPa/m). If the calculated nozzle is higher than the water container outlet, add the answer to the calculated pressure drop. If the nozzle is lower, subtract the two numbers. ELEVATION CHANGE (TOTAL SYSTEM PRESSURE DROP) (English Units) 5.5 ft x 0.43 psi/ft 10.54 psi + 2.37 psi
= 2.37 psi = 12.91 psi
(Metric Units) 1.68 m x 9.72 kPa/m = 16.33 kPa 71.6 kPa + 18.76 kPa = 90.37 kPa
Therefore, our example system meets the requirement of a total pressure drop less than 20 psi (138 kPa). 4.2.2
Problem #2: A gas turbine space, 28 ft (8.53m) long x 24’-0” ft (7.32m) wide x 13 ft (3.96m) high
4.2.2.1 DETERMINING HAZARD VOLUME The first calculation required in the design of a Micromist System for Gas Turbine Spaces is to determine the volume of the space being protected. x
Check length and width to confirm enclosure dimensions do exceed 24 ft. (7.32m).
The 24 ft (7.32m) width does not exceed the 24ft, however, the 28 ft width does. In this case, two 112 gallon containers are required. x x
The volume is determined by multiplying: length x width x height. Volume = 28 ft x 24 ft x 13 ft = 8,736 ft3 (8.53m x 7.32m x 3.96m = 247.3m3)
The volume of the enclosure is less than the 9,175 ft3 (260 m3) maximum protected volume allowed for the Micromist System.
Section 4 / Page 16 of 24 Revision: 2 Revision Date: March, 2008
Micromist£ Manual P/N: 06-153
F.M. J.I. 3000746
SAMPLE PROBLEMS 4.2.2.2 NOZZLE QUANTITY The nozzle grid for Gas Turbine Spaces is predetermined. All Micromist Systems for Gas Turbine Spaces consist of six nozzles. If the room is 24 ft. long or less, 1 system with 6 nozzles is required. If the room is greater than 24 ft. in one direction then 2 systems with 12 nozzles are required. Since one dimension for Problem #2 is greater than 24 ft., 2 systems with 6 nozzles is required. 4.2.2.3
NOZZLE SPACING
d1
d2
d2 d1
Gas Turbine Nozzle Spacing Figure 4.2.2.2
DISTANCE FROM CEILING AND FLOOR (English Units) Distance: ceiling to upper nozzle and floor to lower nozzle d1 = 0.26 x h d1 = 0.26 x 13ft = 3.38ft # 3’-4 1/2”
F.M. J.I. 3000746
(Metric Units) Distance: ceiling to upper nozzle And floor to lower nozzle d1 = 0.26 x h d1 = 0.26 x 3.96m = 1.029m # 1.3m
Micromist£ Manual P/N: 06-153
Section 4 / Page 17 of 24 Revision: 2 Revision Date: March, 2008
SAMPLE PROBLEMS Calculate the distance from the wall to adjacent nozzles. DISTANCE FROM WALL (English Units) Distance: Wall to adjacent nozzle d2 = 0.17 x w d2 = 0.17 x 24ft = 4.08ft # 4’-1”
(Metric Units) Distance: Wall to adjacent nozzle d2 = 0.17 x w d2 = 0.17 x 7.32m = 1.244m # 1.24m
4.2.2.4 PIPING LAYOUT Calculations must be made to verify that the water will be delivered to the nozzles at the correct pressure.
" 1/2 " 1/2
4 2'-
1
" 1/2 " '-0 14 " 1/2 " 1/2
" 5/8 2" / 41 3'-
4 2'-
5 3'4
" 5/8 " '- 0 14
1/2 "
" 5/8 " 0 1'-
1 3'- /2" 41 /2" 4'1"
6 5/8 " 20 '-1 1"
" 1/2 " 3 6'-
2
" 1/2 " '- 0 14
" 1/2 " 3 0'-
" 1/2 " /2 41 ' 2
4 " 1/2 " 0 3'-
1/2 1'- " 0"
" 1/2 " '-0 11
" 5/8 " 10 2'-
" 1/2 /2" 41 2'-
" 5/8 8" 6'-
" 1/2 3" 6'-
5/8 6'- " 0" 6 " 5/8 8" 5'-
EM ST SY EM ST SY 4'-
1"
3'4
" 1/2 " 3 6'-
#1
#2
1/2 "
Example of Turbine Generator Nozzle System Figure 4.2.2.3 It is now possible to determine our piping system sizing to supply these nozzles. Figure 3.9 illustrates a possible piping arrangement for the example enclosure.
Section 4 / Page 18 of 24 Revision: 2 Revision Date: March, 2008
Micromist£ Manual P/N: 06-153
F.M. J.I. 3000746
SAMPLE PROBLEMS 4.2.2.5 DETERMINING PIPE SIZE The same method is used to determine the total pressure drop for Gas Turbine Spaces as was used for Machinery Spaces. In this example, both systems will be calculated from the far wall. The lower nozzle is actually farther away, however, there will be a pressure increase gained at this nozzle due to the elevation drop to the nozzle. Therefore, the upper nozzle will have the greater pressure drop. If you are uncertain as to which nozzle is the worst case, you must perform the calculations for each nozzle. This example will use Copper Type L Tubing. Refer to section 2.2.3.2 for the table of Equivalent Lengths of Threaded Pipe Fittings and Bends for the values used in the calculations below. This calculation is made in order to determine the equivalent length of the piping that connects the selected nozzle to the Water Storage Tank. The equivalent length for a section of pipe is determined by adding the straight length of pipe to the equivalent length of all the fittings in the section. System #1 Begin with the section of pipe directly connected to the selected nozzle and proceed with the calculations for each pipe section all the way to the Water Storage Tank. Disregard the 6’-3” piece of pipe, because pressure is increased through this pipe. The first section of pipe consists of a 3’-4 1/2” (1.03m) length and a 14’-0” (4.27m) length of 1/2” (15 mm) pipe, as well as a 1/2” (15 mm) x 5/8” (15 mm) x 1/2” (15 mm) thru tee, and 2 x 1/2” (15 mm) 90q elbows. The equivalent pipe length for the first pipe section is tabulated below: NODE 1 1 Nozzle Flow – (English Units) 3’– 4 1/2” of 1/2” pipe 14’-0” of 1/2” pipe 2pc. 1/2”, 90q elbow 1pc. 1/2” thru tee Total
1 Nozzle Flow – (Metric Units) 1.03 m of 15 mm pipe 4.27 m of 15 mm pipe 2pc. 15 mm, 90q elbow 1pc. 15 mm thru tee Total
= 3.38 ft = 14.0 ft = 2.00 ft = 0.00 ft = 19.37 ft
= = = = =
1.03 m 4.27 m 0.61 m 0.00 m 5.91 m
Now proceed to the next section of pipe. This section consists of a 14’-0” (4.27 m) and a 1’-0” (0.30 mm) length of 5/8” (16 mm) pipe as well as a 5/8” (16 mm) x 5/8” (16 mm) x 1/2” (16 mm) thru tee and a 5/8” 90q elbow. Therefore, our equivalent lengths are: NODE 5 5 Nozzle Flow – (English Units) 15’-0” of 5/8” pipe 1pc. 5/8”, 90q elbow 1pc. 5/8” thru tee Total
5 Nozzle Flow – (Metric Units) 4.57 m of 16 mm pipe 0.46 m of 16 mm pipe 1pc. 16 mm thru tee Total
= 15.0 ft = 1.5 ft = 0.0 ft = 16.5 ft
= = = =
4.57 m 0.46 m 0.00 m 5.03 m
Our next section of pipe is for the 6 nozzle flow: NODE 6 6 Nozzle Flow – (English Units) 31’-11’ of 5/8” pipe 3pc. 5/8”, 90q elbows Total
F.M. J.I. 3000746
= 31.92 ft = 4.50 ft = 36.42 ft
6 Nozzle Flow – (Metric Units) 9.73 m of 16 mm pipe = 3pc. 16 mm, 90q elbows = Total =
Micromist£ Manual P/N: 06-153
9.73 m 1.37 m 11.1 m
Section 4 / Page 19 of 24 Revision: 2 Revision Date: March, 2008
SAMPLE PROBLEMS 4.2.2.5 DETERMINING PIPE SIZE (CONTINUED) To determine the pressure drop for the piping system, we multiply the equivalent lengths for each of the different nozzle flows by their corresponding pressure drop factors. The pressure drop for each nozzle flow in our example is calculated below: Pressure Drop (English Units)
(Metric Units)
1/2” @ 1 nozzle flow – 19.38’ x 0.041 psi/ft = 0.79 5/8” @ 5 nozzle flow – 16.5’ x 0.266 psi/ft = 4.39 5/8” @ 6 nozzle flow – 36.4’ x 0.368 psi/ft = 13.4 (Pressure Drop) psi = 18.58
15mm @ 1 nozzle flow – 5.91m x 0.93 kPa/m 16mm @ 5 nozzle flow – 5.03m x 6.02 kPa/m 16mm @ 6 nozzle flow – 11.1m x 8.32 kPa/m (Pressure Drop) kPa
= 5.48 = 30.3 = 92.4 = 128.2
The final consideration is the change in system pressure due to elevation. Pressure changes by 0.43 psi/ft (9.72 kPa/m) of drop/rise. The net elevation change in our example is a 9.71 ft (2.96 m) rise. Multiply the net elevation change by 0.43 psi/ft (9.72 kPa/m). If the calculated nozzle is higher than the water container outlet, add the answer to the calculated pressure drop. If the nozzle is lower, subtract the two numbers. ELEVATION CHANGE (TOTAL SYSTEM PRESSURE DROP) (English Units) 9.71 ft x 0.43 psi/ft 18.58 psi - 4.18 psi
= 4.18 psi = 14.40 psi
(Metric Units) 2.96 m x 9.72 kPa/m = 28.77 kPa 128.2 kPa - 28.77 kPa = 99.43 kPa
Therefore, our example system meets the requirement of a total pressure drop less than 20 psi (138 kPa). System #2 1st Calculation System #2 will have 2 calculations. The second set of calculations will size the pipe sections supplying the 4 nozzles in the middle of the back wall. Begin with the section of pipe directly connected to the selected nozzle and proceed with the calculations for each pipe section all the way to the Water Storage Tank. The first section of pipe consists of a 3’-4 1/2” (1.03m) length and a 14’-0” (4.27m) length of 1/2” (15 mm) pipe, as well as a 1/2” (15 mm) x 1/2” (15 mm) x 1/2” (15 mm) side tee, a 1/2” (15 mm) x 1/2” (15 mm) x 1/2” (15 mm) thru tee, and a 1/2” (15 mm) 90q elbow. The equivalent pipe length for the first pipe section is tabulated below: NODE 2 2 Nozzle Flow – (English Units) 2’-4 1/2” of 1/2” pipe 14’-0” of 1/2” pipe 1pc. 1/2”, 90q elbow 1pc. 1/2” thru tee 1pc. 1/2” side tee Total
Section 4 / Page 20 of 24 Revision: 2 Revision Date: March, 2008
= 2.38 ft = 14.0 ft = 1.00 ft = 0.00 ft = 2.00 ft = 19.37 ft
2 Nozzle Flow – (Metric Units) 0.72 m of 15 mm pipe 4.27 m of 15 mm pipe 1pc. 15 mm, 90q elbow 1pc. 16 mm thru tee 1pc. 16 mm thru tee Total
Micromist£ Manual P/N: 06-153
= = = = = =
0.72 m 4.27 m 0.31 m 0.00 m 0.61 m 5.91 m
F.M. J.I. 3000746
SAMPLE PROBLEMS 4.2.2.5 DETERMINING PIPE SIZE (CONTINUED) Now proceed to the next section of pipe. This section consists of a 3’-0” (0.91 m) length of 1/2” (15 mm) pipe as well as a 1/2” (15 mm) side tee. Therefore, our equivalent lengths are: NODE 4 4 Nozzle Flow – (English Units) 3’-0” of 1/2” pipe = 1pc. 1/2” side tee = Total =
4 Nozzle Flow – (Metric Units)
3.0 ft 2.0 ft 5.0 ft
0.91 m of 15 mm pipe 1pc. 15 mm thru tee Total
= = =
0.91 m 0.61 m 1.52 m
Our next section of pipe is for the 6 nozzle flow: NODE 6 6 Nozzle Flow – (English Units) 13.17’ of 5/8” pipe 2pc. 5/8” 90q elbow Total
6 Nozzle Flow – (Metric Units) 4.01 m of 16 mm pipe = 2pc. 16 mm 90q elbow = Total =
= 13.17 ft = 3.00 ft = 16.17 ft
4.01 m 0.91 m 4.92 m
To determine the pressure drop for the piping system, we multiply the equivalent lengths for each of the different nozzle flows by their corresponding pressure drop factors. The pressure drop for each nozzle flow in our example is calculated below: Pressure Drop (English Units)
(Metric Units)
1/2” @ 2 nozzle flow – 19.37’ x 0.139 psi/ft = 2.69 1/2” @ 4 nozzle flow – 5.0’ x 0.474 psi/ft = 2.37 5/8” @ 6 nozzle flow – 16.17’ x 0.28 psi/ft = 5.95 (Pressure Drop) psi = 11.01
15mm @ 2 nozzle flow – 5.91m x 3.14 kPa/m 15mm @ 4 nozzle flow – 1.52m x 10.7 kPa/m 16mm @ 6 nozzle flow – 4.92m x 6.33 kPa/m (Pressure Drop) kPa
= = = =
18.6 16.3 31.1 66.0
The final consideration is the change in system pressure due to elevation. Pressure changes by 0.43 psi/ft (9.72 kPa/m) of drop/rise. The net elevation change in our example is a 3.292 ft (1.00 m) rise. Multiply the net elevation change by 0.43 psi/ft (9.72 kPa/m). If the calculated nozzle is higher than the water container outlet, add the answer to the calculated pressure drop. If the nozzle is lower, subtract the two numbers. ELEVATION CHANGE (TOTAL SYSTEM PRESSURE DROP) (English Units) 3.292 ft x 0.43 psi/ft 11.01 psi + 1.42 psi
= 1.42 psi = 12.43 psi
(Metric Units) 1.00 m x 9.72 kPa/m = 9.72 kPa 66.0 kPa + 9.72 kPa = 75.72 kPa
Therefore, our example system meets the requirement of a total pressure drop less than 20 psi (138 kPa).
F.M. J.I. 3000746
Micromist£ Manual P/N: 06-153
Section 4 / Page 21 of 24 Revision: 2 Revision Date: March, 2008
SAMPLE PROBLEMS 4.2.2.5 DETERMINING PIPE SIZE (CONTINUED) 2nd Calculation This calculation is to determine the pipe size for the 4 nozzles on the back wall. Use the same pipe dimensions from the first calculation for the upstream pipe. This is done to verify that the pipe being calculated will have enough pressure with previously calculated pipe. The first section of pipe consists of a 3” (0.25m) length and a 1/2” (15 mm) x 1/2” (15 mm) x 1/2” (15 mm) side tee. The equivalent pipe length for the first pipe section is tabulated below:
" 1 /2 " 1/2
4 2'-
" 1 /2 " '-0 14 " 1/2 " /2 41
4 " 5/8 2" / 41 '3
2'-
5 3'4
" 5 /8 " '-0 14
1/2 "
" 5 /8 " 0 1 '-
1 3'- /2" 41 /2" 4'1"
2 " 1/2 " 3 6'1 " 1/2 " 3 0'-
6 5/8 " 20 '-1 1"
1/2
" 1/2 " 0 3'-
1/2 1'- " 0"
" 1/2 " ' -0 11
EM ST SY EM ST SY "
3'-
"
" 1/2
" 5/8 8" 5 '-
" 5 /8 8" 6'-
" 1/2 3" 6'-
4 2'-
5/8 6'- " 0"
" 5 /8 " 10 2'-
" 1/2 /2" 41 2'-
4'1
" 1/2 " 3 6'-
" 1/2 " ' -0 14
#1
#2
41 /2"
NODE 1 1 Nozzle Flow – (English Units) 0.25’ of 1/2” pipe 1pc. 1/2” side tee Total
Section 4 / Page 22 of 24 Revision: 2 Revision Date: March, 2008
= = =
0.25 ft 2.00 ft 2.25 ft
1 Nozzle Flow – (Metric Units) 0.08 m of 15 mm pipe 1pc. 15 mm thru tee Total
Micromist£ Manual P/N: 06-153
= = =
0.08 m 0.61 m 0.69 m
F.M. J.I. 3000746
SAMPLE PROBLEMS 4.2.2.5 DETERMINING PIPE SIZE (CONTINUED) Now proceed to the next section of pipe. This section consists of a 6’-3” (1.91 m) length of 1/2” (15 mm) pipe as well as a 1/2” (15 mm) thru tee. Therefore, our equivalent lengths are: NODE 2 2 Nozzle Flow – (English Units) 6.25’ of 1/2” pipe = 1pc. 1/2” thru tee = Total =
2 Nozzle Flow – (Metric Units)
6.25 ft 0.00 ft 6.25 ft
1.91 m of 15 mm pipe 1pc. 15 mm thru tee Total
= = =
1.91 m 0.00 m 1.91 m
Our next section of pipe is for the 4 nozzle flow: NODE 4 4 Nozzle Flow – (English Units) 3.38’ of 5/8” pipe 2pc. 5/8” side tee Total
= 3.38 ft = 2.00 ft = 5.38 ft
4 Nozzle Flow – (Metric Units) 1.03 m of 16 mm pipe 2pc. 16 mm side tee Total
= = =
1.03 m 0.61 m 1.64 m
Our next section of pipe is for the 5 nozzle flow: NODE 5 5 Nozzle Flow – (English Units) 15’ of 5/8” pipe = 1pc. 5/8” thru tee = 1pc. 5/8” 90q elbow Total =
5 Nozzle Flow – (Metric Units)
15.0 ft 0.00 ft = 1.50 ft 16.5 ft
1.91 m of 16 mm pipe 1pc. 16 mm thru tee 1pc. 16mm 90q elbow Total
= = = =
1.91 m 0.00 m 0.46 m 2.37 m
Our next section of pipe is for the 6 nozzle flow: NODE 6 6 Nozzle Flow – (English Units) 31.92’ of 5/8” pipe 3pc. 5/8” 90q elbow Total
= 31.92 ft = 4.50 ft = 7.88 ft
6 Nozzle Flow – (Metric Units) 9.73 m of 16 mm pipe = 3pc. 16 mm 90q elbow = Total =
9.73 m 1.37 m 11.1 m
To determine the pressure drop for the piping system, we multiply the equivalent lengths for each of the different nozzle flows by their corresponding pressure drop factors.
F.M. J.I. 3000746
Micromist£ Manual P/N: 06-153
Section 4 / Page 23 of 24 Revision: 2 Revision Date: March, 2008
SAMPLE PROBLEMS 4.2.2.5 DETERMINING PIPE SIZE (CONTINUED) The pressure drop for each nozzle flow in our example is calculated below: Pressure Drop (English Units) 1/2” @ 1 nozzle flow 1/2” @ 2 nozzle flow 5/8” @ 4 nozzle flow 5/8” @ 5 nozzle flow 5/8” @ 6 nozzle flow
(Metric Units)
– 2.25’ x 0.041 psi/ft = 0.09 – 6.25’ x 0.139 psi/ft = 0.87 – 5.38’ x 0.179 psi/ft = 0.96 – 16.5’ x 0.266 psi/ft = 4.39 – 36.42’ x 0.368 psi/ft = 13.4 (Pressure Drop) psi = 19.71
15mm @ 1 nozzle flow 15mm @ 2 nozzle flow 16mm @ 4 nozzle flow 16mm @ 5 nozzle flow 16mm @ 6 nozzle flow
– – – – –
0.69m x 0.93 kPa/m 1.91m x 3.14 kPa/m 1.64m x 4.05 kPa/m 2.37m x 6.02 kPa/m 11.1m x 8.32 kPa/m (Pressure Drop) kPa
= = = = = =
0.64 6.00 6.64 14.3 92.4 120
The final consideration is the change in system pressure due to elevation. Pressure changes by 0.43 psi/ft (9.72 kPa/m) of drop/rise. The net elevation change in our example is a 2.9583 ft (0.902 m) rise. Multiply the net elevation change by 0.43 psi/ft (9.72 kPa/m). If the calculated nozzle is higher than the water container outlet, add the answer to the calculated pressure drop. If the nozzle is lower, subtract the two numbers. ELEVATION CHANGE (TOTAL SYSTEM PRESSURE DROP) (English Units) 2.9583 ft x 0.43 psi/ft 19.71 psi - 1.27 psi
= 1.27 psi = 18.44 psi
(Metric Units) 0.902 m x 9.72 kPa/m = 8.77 kPa 120 kPa - 8.77 kPa = 111.23 kPa
Therefore, our example system meets the requirement of a total pressure drop less than 20 psi (138 kPa).
Section 4 / Page 24 of 24 Revision: 2 Revision Date: March, 2008
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F.M. J.I. 3000746
Section 5 System Installation
SYSTEM INSTALLATION 5.0 SYSTEM INSTALLATION Each Micromist installation must be completed in accordance with NFPA 750, this manual, the Authority Having Jurisdiction (AHJ), and all applicable codes, regulations, and standards. NOTE: For detailed instructions of the installation, refer to the Micromist System Assembly Installation Drawings. These drawing numbers are listed below: x x x x
73-010 – Micromist System Ass’y. Installation Drawing, 70 Gallon (265 Liter) 73-011 – Micromist System Ass’y. Installation Drawing, 112 Gallon (424 Liter) 73-001 – Micromist System Ass’y. Installation Drawing, 70 Gallon (265 Liter) w/ Pressure Switch 73-002 – Micromist System Ass’y. Installation Drawing, 112 Gallon (424 Liter) w/ Pressure Switch
5.1 STORAGE CONTAINERS The Micromist system is factory pre-assembled and mounted on a steel skid. The Water Container is attached to the Nitrogen Tank Assembly(s) with mounting straps and a Uni-strut£ bracket. These pre-assembled components simplify the installation of the Micromist system by minimizing the amount of assembly required in the field. 5.2 DISCHARGE PIPING CONNECTION The Micromist system is designed and pre-assembled so that it may be quickly and easily connected to the piping network of the system. The water valve outlet of the Micromist system is threaded with a 3/4” NPT female outlet. This connection is for the discharge piping. 5.3 PIPING NETWORK MATERIALS The thickness of the pipe or tubing wall shall be calculated in accordance with ASME B31.1 Power Piping Code. For Micromist, use an internal pressure of 320 psi (22.1 bar). Only FM-approved rigid pipe hangers may be used when installing the piping systems. Refer to Section 5.3.1 for a list of acceptable materials. CAUTION: The following SHALL NOT be used for any Micromist System installation: x Nonmetallic or cast-iron pipe and fittings x Black or galvanized pipe 5.3.1 TUBING AND PIPE The tubing and pipe used in Micromist systems, SHALL be of noncombustible material having physical and chemical characteristics such that its deterioration under stress can be predicted with reliability. Acceptable materials include: x x x
Stainless Steel Pipe - Schedule 40 Stainless Steel Tubing – (refer to Section 3.6.2 for acceptable wall thickness) Copper Tubing Type K and Type L
(For detailed description, refer to Equipment, Section 2.6.) Stainless steel or copper tube bending is permitted when bends conform to the following criteria: x x x
No kinks, ripples, distortions, reductions in diameter, or noticeable deviations from round allowed Minimum radius of any bend shall be six (6) pipe diameters Bends must be made mechanically using a Swagelok£ Tubing bender, or equivalent
All pipe should be reamed, blown clear, and swabbed with a solvent to remove dirt and cutting oils before assembly.
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Section 5 / Page 1 of 7 Revision: 2 Revision Date: March, 2008
SYSTEM INSTALLATION 5.3.1.1 RECOMMENDED TUBE FITTINGS Stainless steel tubing is to be connected using approved mechanical fittings such as the Swagelok£ Tube Fittings or approved equivalent. Swagelok£ Part Numbers for Various Fittings Fitting Tee 90° Elbow Union Connector Adapter Adapter Reducer Reducer Reducer Tube Cap Tube Plug
Description All tube fittings All tube fittings All tube fittings
1/2“ (15mm) SS-810-3 SS-810-6 SS-810-9
Tube fitting to SS-810-1-8 1/2” Male NPT 1/2” Tube stub to SS-8-TA-1-8 1/2” Male NPT 1/2” Tube stub to SS-8-TA-7-8 1/2” Female NPT 1/2” Tube Fitting to Tube stub 5/8” Tube Fitting to Tube stub 3/4” Tube Fitting to Tube stub To cap a tube To plug a port
5/8” (16mm) SS-1010-3 SS-1010-6 SS-1010-9
3/4" (20mm) SS-1210-3 SS-1210-6 SS-1210-9
1” (25mm) SS-1610-3 SS-1610-6 SS-1610-9
SS-1010-1-8
SS-1210-1-8
SS-1610-1-8
SS-810-R-10
SS-810-R-12
SS-810-R-16
1 1/4" (32mm) SS-2000-3 SS-2000-6 SS-2000-9
SS-810-R-20
SS-1010-R-12 SS-1010-R-16 SS-1010-R-20 SS-1210-R-16 SS-1210-R-20 SS-810-C SS-810-P
SS-1010-C SS-1010-P
SS-1210-C SS-1210-P
SS-1610-C SS-1610-P
SS-2010-C SS-2010-P
5.3.2 FITTING MATERIALS Approved fittings for Micromist system distribution piping SHALL be as follows: x x x
Brazed Copper Fittings Class 2000 Lb. Stainless Steel Fittings Stainless Steel Compression-type Tube Fittings
5.3.3 SIZE REDUCTIONS A one-piece reducing fitting should be used whenever a change is made in the pipe size. However, hexagonal bushings will be permitted for reducing the size of openings of fittings when standard fittings of the required size are not available. 5.3.4 PIPE JOINTS All threads used in joints and fittings SHALL conform to ANSI B1.20.1 (Pipe Threads, General Purpose). Thread lubricant/sealant SHALL be applied to the male threads only. (Stainless Steel Pipe only) Where tubing is joined with compression-type fittings, the manufacturer’s pressure/temperature ratings for the fitting SHALL not be exceeded.
Section 5 / Page 2 of 7 Revision: 2 Revision Date: March, 2008
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SYSTEM INSTALLATION 5.4 INSTALLING MAIN DISCHARGE PIPING Each pipe or shall be cleaned internally after preparation, and before assembly, by means of swabbing with a suitable nonflammable cleaner. Teflon£ tape shall be used on all threaded joints. The piping system should be securely supported, and should not be subject to mechanical, chemical, vibration, or other damage. Pipe hangers shall be spaced at intervals not exceeding those listed in the following table: Maximum Hanger Spacing and Rod Sizing – Stainless Steel English Units
Metric Units
Pipe Size NPT in.
Max Spacing ft.
Rod Size in. dia.
Pipe Size BSP mm.
Max Spacing m.
Rod Size mm.
1/2
5
3/8
15
1.50
10
3/4
6
3/8
20
1.80
10
1
7
3/8
25
2.10
10
1 1/4
9
3/8
32
2.75
10
1 1/2
9
3/8
40
2.75
10
Maximum Hanger Spacing and Rod Sizing – Copper Pipe/Tube English Units
Metric Units
Pipe Size NPT in.
Max Spacing ft.
Rod Size in. dia.
Pipe Size BSP mm.
Max Spacing m.
Rod Size mm.
1/2
8
3/8
15
2.44
10
3/4
8
3/8
20
2.44
10
1
8
3/8
25
2.44
10
1 1/4
10
3/8
32
3.05
10
1 1/2
10
3/8
40
3.05
10
Uni-strut£ may be used to support the Micromist System piping network. Install at the same intervals as noted in the hanger spacing table. Piping can be secured using Uni-strut£ pipe clamps or Swagelok£ tube clamps. (Consult local suppliers for details.) NOTE: ANSI B31.1 shall be consulted for guidance in this matter. All system piping shall be installed in strict accordance to system plans. If any piping changes are necessary, the system MUST be recalculated to assure all design criteria are still complied with. 5.5 NITROGEN VALVE CONNECTIONS The Micromist system is factory pre-assembled and attached to a steel mounting skid to reduce the amount of assembly required in the field. For protection during shipment, the attachments to the air valve(s) have been removed, and a safety shipping cap placed over the nitrogen valve(s). NOTE: Whenever the Nitrogen cylinder is handled, moved, or transported in any manner, the safety shipping cap MUST be in place to avoid injury to personnel, or damage to equipment.
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Micromist£ Manual P/N: 06-153
Section 5 / Page 3 of 7 Revision: 2 Revision Date: March, 2008
SYSTEM INSTALLATION 5.5.1 70 GALLON (265 LITER) NITROGEN VALVE CONNECTION When the Micromist system has been positioned in its final location, the protective cap on the nitrogen valve can be removed. The following steps are required to make the nitrogen valve connections. The numbers in the instructions refer to the numbers in the following parts list and Figure 5.5.1. 1) 2) 3) 4) 5) 6) 7) 8)
73-007 73-005 CO2-1290 02-4543 02-4521 02-4537 02-4606 02-4550
Assembly, Solenoid Valve Assembly, Control Valve with Pressure Switch Hose, Braided, ¼” (8mm) JIC Ends x 7 1/2” (191mm) long, SS / Brass Connector 1/4” (8mm) JIC x 1/8” (4mm) NPT, Brass Orifice 1/8” (4mm) NPT, Brass Tee, 1/8” NPT, Brass Hose, Braided 1/2” NPT x 1/2” JIC x 12” (305mm) Long, SS / Brass Pressure Switch
HIGH PRESSURE SIDE WITH OPTIONAL PRESSURE SWITCH
HIGH PRESSURE SIDE WITH STANDARD PRESSURE GAUGE 3
4
5
6
3
4
5
6
7
1
7
8 2
70 Gallon (265 Liter) Air Valve Connections Figure 5.5.1 Step 1. Step 2. Step 3. Step 4.
Step 5. Step 6. Step 7.
Connect the Orifice (5) to one end of the Tee (6). Attach Connector (4) to center port of the Tee (6). Attach the assembled Tee (6) to the top of the Nitrogen Valve, as shown. CRITICALLY IMPORTANT: Install Teflon£ tape on the Solenoid Valve Assembly (1) or (2) Connector and thread into the fill valve port on the side of the Nitrogen Valve. Failure to use Teflon£ tape on this connection will result in the threads being damaged or stripped off the connector - rendering the Connector unfit for service. Carefully align and turn the solenoid assembly into the Nitrogen Valve approximately five (5) turns until the assembly is snug. Some Nitrogen leakage will be observed. Continue tightening until the leakage stops and assembly is oriented as shown in the figure above. Attach the 7 1/2” (191 mm) Braided Hose (3) to the Solenoid Valve Assembly (1) or (2) and the Connector (4). Connect the 12” (305 mm) long Braided Hose (7) between discharge port of the Nitrogen Valve on the Nitrogen Tank and the Pressure Regulator on the Water Storage Tank.
Section 5 / Page 4 of 7 Revision: 2 Revision Date: March, 2008
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F.M. J.I. 3000746
SYSTEM INSTALLATION 5.5.2 112 GALLON (424 LITER) NITROGEN VALVE CONNECTIONS When the Micromist system has been positioned in its final location, the protective caps on both nitrogen valves can be removed. The following steps are required to make the nitrogen valve connections. The numbers in the instructions refer to the numbers in the following parts list and Figure 5.5.2. 1) 2) 3) 4) 5) 6) 7) 8) 9) 10) 11)
73-007 73-005 CO2-1290 02-4543 02-4539 02-4533 02-4538 02-4521 02-4537 73-009 73-008
Assembly, Solenoid Valve Assembly, Control Valve with Pressure Switch Hose, Braided 1/4” JIC Ends x 7 1/2” (191mm) long, SS / Brass Connector 1/4” JIC x 1/8” (4mm) NPT, Brass Tee, Branch 1/8”, Brass Hose, Braided 1/2” NPT x 1/2” JIC x 23” (584mm) Long, SS / Brass Hose, Braided 1/8” NPT x 1/4” JIC x 13 1/2” (343mm) Long, SS / Brass Orifice 1/8” NPT (4mm), Brass Tee, 1/8” NPT, Brass Assembly, Pressure Gauge (Tank 2) Assembly, Pressure Switch (Tank 2)
HIGH PRESSURE SIDE WITH OPTIONAL PRESSURE SWITCHES 6 7 4 5 8 4
HIGH PRESSURE SIDE WITH STANDARD PRESSURE GAUGES 6 4 3
5
4
7 8
3
9
9 11
10
1
2
112 Gallon (424 Liter) Air Valve Connections Figure 5.5.2 Step 1. Step 2. Step 3.
Step 4. Step 5. Step 6. Step 7. Step 8.
Attach a Connector (4) to both sides of the Branch Tee (5). Attach the assembled Branch Tee (5) to the top of the Nitrogen Valve on the left Nitrogen Tank CRITICALLY IMPORTANT: Install Teflon£ tape on the Control Valve Assembly (1) or (2) Connector and thread into the fill valve port on the side of the left Nitrogen Valve. Failure to use Teflon£ tape on this connection will result in the threads being damaged or stripped off the connector - rendering the connector unfit for service. Carefully align and turn the solenoid assembly into the Nitrogen Valve approximately five (5) turns until the assembly is snug. Some Nitrogen leakage will be observed. Continue tightening until the leakage stops and assembly is oriented as shown in the figure above. Attach the 7 1/2” (191mm) Braided Hose (3) to the Solenoid Valve Assembly (1) or (2) and the Connector (4). Connect the Orifice (8) to one end of the Tee (9). Attach the assembled Tee (9) to the top of the Nitrogen Valve on the right Nitrogen Tank, as shown. Connect the 13 1/2” (343mm) Braided Hose (7) between the Connector (4) on the left Nitrogen Tank to the Tee (9) on the right Nitrogen Tank.
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Section 5 / Page 5 of 7 Revision: 2 Revision Date: March, 2008
SYSTEM INSTALLATION CRITICALLY IMPORTANT: Install Teflon£ tape on the Pressure Gauge (10) Connector or Pressure Switch (11) Connector and thread into the fill valve port on the side of the right Nitrogen Valve. Failure to use Teflon£ tape on this connection will result in the threads being damaged or stripped off the connector - rendering the connector unfit for service. Step 10. Carefully align and turn the assembly into the Nitrogen Valve approximately five (5) turns until the assembly is snug. Some Nitrogen leakage will be observed. Continue tightening until the leakage stops and assembly is oriented as shown in the figure above. Step 11. Connect the 23” (584mm) long Braided Hoses (6) between the air valves on the Nitrogen Tanks and the Tee at the pressure regulator on the Water Storage Tank.
Step 9.
5.6 SOLENOID VALVE WIRING Two solenoids are used in the Micromist system. The solenoid valves are 12 VDC devices wired in series to a SRM (solenoid releasing module) as shown in Figure 5.6.
Wiring Diagram for Solenoids Figure 5.6
Section 5 / Page 6 of 7 Revision: 2 Revision Date: March, 2008
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SYSTEM INSTALLATION 5.7 LIQUID LEVEL SWITCH WIRING The liquid level switch is a SPST switch whose contacts are in the open position when the tank is full (switch in the up position). The control panel supervises the switch. When the water level drops below a predetermined point, the contacts close. This sends a supervisory indication to the control panel. The liquid level switch has a 1/2” NPT conduit connection. The liquid level switch is wired to a contact monitoring module as shown in Figure 5.7.
Wiring Diagram for Liquid Level Switch Figure 5.7 5.8 WATER TANK FILL PROCEDURE Before the system can be placed into operation, the water tank must be filled. The drain/fill valve in the bottom of the water tank is a 90q ball valve with a 1/2” NPT male outlet. Attach a hose adapter to the inline filter attached to the drain/fill valve and connect the water hose to the tank. Open the vent valve located in the cross at the top of the water tank. Turn water on and fill the tank. The water tank should be filled until water is observed flowing out of the vent valve. Shut off the water supply, close the drain/fill valve, and close the vent valve. The water tank is now full and operational. 5.9 PROGRAMMING THE CHEETAH CONTROL PANEL Refer to the Cheetah Xi and Xi50 Installation, Operation, and Maintenance Manuals (P/N 06-356 and 06-369) with C-Linx, for configuration instructions. The mist is directed into the protected area for 40 seconds and turned off for 40 seconds for a total of 8 cycles “on” and 7 cycles “off” for a minimum of 10 minutes. This on/off cycle time applies to both Machinery Space and Gas Turbine Generator Space applications.
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Section 5 / Page 7 of 7 Revision: 2 Revision Date: March, 2008
Section 6 Final System Checkout
FINAL SYSTEM CHECKOUT 6.0 FINAL SYSTEM CHECKOUT The checkout procedures outlined in this section are intended to be a minimum requirement for the extinguishing portion of the system. Refer to NFPA Standard 750, latest edition for additional test requirements. Additional procedures may be required by the Authority Having Jurisdiction (AHJ). The control portion of the system should be thoroughly checked out according to the manufacturer’s recommendations and the Authority Having Jurisdiction (AHJ). 6.1 HAZARD AREA CHECK A thorough review of the hazard area is just as important as the proper operation of system components. Certain aspects about the hazard may have changed, or been overlooked, that could affect overall system performance. The following points should be thoroughly checked. 6.1.1 AREA CONFIGURATION The area dimensions should be checked against those shown on the system plan(s). If the area volume has changed, a recalculation of the volume is necessary to be sure that the area volume is still within the system limitations of 9,175 ft3 (260 m3) with a maximum ceiling height of 16 ft. The area should be checked to determine that objects, such as movable partitions, have not been placed in such a manner that they block the effective operation of a nozzle(s). 6.1.2 AREA SECURITY The hazard area should be checked to be sure that all doors entering the area have automatic door closures and are working properly. Check to be sure that the ventilation shutdown system has been installed and is working and that the shutdown systems for fuel and lubrication supplies are properly installed. 6.1.3 PERSONNEL SAFETY When a full discharge test is required, as a minimum the safety requirement in NFPA Standard 750, Section 4.2 shall be followed. 6.2 SYSTEM CHECK As a minimum the following items shall be checked and tested, refer to NFPA Standard 750, Section 12.2.6 for additional test requirements. 6.2.1 CONTAINERS Check to make sure that all containers and brackets are securely fastened. The vent valve on the water storage tank must be CLOSED. Make sure that all hose connections on the containers are properly installed and are tight. Check the drain/fill valve to be sure that it is closed. The pressure gauge(s), if provided, on the gas cylinder(s) should be checked to assure they indicate 1,850 – 1,980 psi @ 70°F (12,893 – 13,652 kPa @ 21°C). The electrical connections to the solenoid valve(s) must be checked to assure they are properly connected. 6.2.2 DISCHARGE PIPING The discharge piping should be checked to see that it is securely supported and free from any lateral movement. All joints should be checked for mechanical tightness. Discharge piping shall be pressure tested, as outlined in NFPA 750, latest edition. 6.2.3 NOZZLES Check to see that the correct nozzles are installed, and that they are in their proper locations, according to system plans. Make sure that large objects have not been placed in front of the nozzles, which would block the water discharge pattern. 6.2.4 AUXILIARY FUNCTIONS Operation of auxiliary functions, such as door closures, damper closures, air handling and fuel shutdown, etc., should be verified when the control system is activated, both manually, and automatically. F.M. J.I. 3000746
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Section 6 / Page 1 of 2 Revision: 2 Revision Date: March, 2008
FINAL SYSTEM CHECKOUT 6.2.5 CONTROL PANEL The operation of the control panel MUST be checked by performing the Control Panel check, as detailed in the Cheetah Installation, Operation, and Maintenance Manual P/N 06-148. 6.3 SYSTEM TEST After the requirement of paragraphs 6.1 thru 6.2.5 have been completed, a full flow system test shall be conducted to verify the following items: All operating parts of the system function as intended and within the proper sequenced. Ensure that all nozzles flow without any restrictions. After flow test, all nozzle strainer screens must be check for particles that may clog the nozzle orifices. At the point, the system must be reset, recharged and put back into service.
Section 6 / Page 2 of 2 Revision: 2 Revision Date: March, 2008
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F.M. J.I. 3000746
Section 7 System Maintenance
SYSTEM MAINTENANCE 7.0 SYSTEM MAINTENANCE The following maintenance procedures, at the intervals indicated, are meant to be a minimum requirement for Fike Micromist Systems. The following procedures do not preclude those required by NFPA 750 and the authority having jurisdiction. More frequent service intervals may be necessary if systems are installed in more severe service applications. This section does not cover maintenance and service procedures for the electrical and control portions of the system. Consult the appropriate manuals for those procedures. 7.1 x
x
7.2 x
DISCHARGE PIPING Every six (6) months: Check the system discharge piping for corrosion and damage. Check all piping supports to make sure they are tight and the pipe securely supported. Every year: Same as six (6) month inspection. Also, blow out the piping with compressed air or nitrogen and check for obstructions. DISCHARGE NOZZLES Every six (6) months: Check to see that nozzle orifices are clear and unobstructed, and are not showing signs of corrosion.
7.3 NFPA 750 INSPECTION, MAINTENANCE AND TESTING FREQUENCIES The following is excerpted from NFPA 750, “Standard for the Installation of Water Mist Fire Protection Systems”. INSPECTION FREQUENCIES Item Activity Water tank (unsupervised) Check water level Water tank (supervised) Check water level Air pressure cylinders (unsupervised) Check pressure and indicator disk System operating components, including control valves (locked/unsupervised) Inspect Air pressure cylinders (supervised) Check pressure and indicator disk System operating components, including control valves Inspect Waterflow alarm and supervisory devices Inspect Initiating devices and detectors Inspect Batteries, control panel, interface equipment Inspect System strainers and filters Inspect Control equipment, fiber optic cable connections Inspect Piping, fittings, hangers, nozzles, flexible tubing Inspect
Item Water tank System Strainers and filters
F.M. J.I. 3000746
MAINTENANCE FREQUENCIES Activity Drain and refill Flushing Clean or replace as required
Micromist£ Manual P/N: 06-153
Frequency Weekly Monthly Monthly Monthly Quarterly Quarterly Quarterly Semiannually Semiannually Annually Annually Annually
Frequency Annually Annually After system operation
Section 7 / Page 1 of 4 Revision: 2 Revision Date: March, 2008
SYSTEM MAINTENANCE TESTING FREQUENCIES Item Activity Control equipment (functions, fuses, interfaces, primary power, remote alarm) (unsupervised) Test Remote alarm annunciation Test Batteries Test Pressure relief valve Manually operate Control equipment (functions, fuses, interfaces, primary power, remote alarm) (supervised) Test Water level switch Test Detectors (other than single use or self-testing) Test Release mechanisms (manual and automatic) Test Control unit/programmable logic control Test Section valve Function test Water Analysis of contents Pressure cylinders (normally at atmospheric pressure) Pressure cylinder (discharge if possible) System Flow test Pressure cylinders Hydrostatic test Automatic nozzles Test (random sample)
Frequency Quarterly Annually Semiannually Semiannually Annually Annually Annually Annually Annually Annually Annually Annually Annually 5 – 12 years 20 years
7.4 RECHARGING OF NITROGEN CYLINDERS The following is the procedure for recharging nitrogen cylinder(s) supplied with the Micromist System Packages. 7.4.1
RECHARGE PROCEDURE Step 1: Install a Fike Nitrogen Fill Valve Assembly (P/N 73-012), with straight-threaded female threads in the larger diameter threads on the inlet of the Micromist System Valve. Step 2: Attach the cylinder equipped with the Nitrogen Fill Valve Assembly, to a pigtail on the nitrogen-fill manifold. Step 3: Allow flow of nitrogen gas into the Fike cylinder. Fill the cylinder to the indicated pressure, using pressure gauge, temperature monitoring device, and appropriate, approved fill chart giving correct final pressure(s) for cylinder (gas) temperature(s). Refer to paragraph 6.4.3 for an approved fill chart. Step 4: Stop pump, shut off nitrogen inlet to manifold and open the quarter-turn ball valve in Nitrogen Fill Valve Assembly to vent the pressure in the supply hose. Step 5: Confirm that the Fike cylinder valve has shut off. Note: Valve failure will be indicated by the cylinder dropping in temperature (as nitrogen flows out, the cylinder will cool to an easily detectable degree). Also, if any cylinder valve fails to shut off, the manifold system will be relatively slow to drop to atmospheric pressure. Mark any cylinders whose valve fails to shut off. WARNING: Be sure that the system pressure is sufficiently near atmosphere so that the pigtail will not “whip” when released from the cylinders. Such whipping action can cause serious injury or death. Step 6: Leak check the cylinder, particularly at the neck where the valve threads into the cylinder; and leak check the valve, particularly at the safety assemblies and other joints. Mark and reject any cylinder found defective. Step 7: Disconnect the cylinder from the manifold pigtail and the Fike Nitrogen Fill Valve Assembly. Install the Safety Shipping Cap on the cylinder. Be sure the cylinder is secured according to OSHA recommendations.
Section 7 / Page 2 of 4 Revision: 2 Revision Date: March, 2008
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F.M. J.I. 3000746
SYSTEM MAINTENANCE 7.4.2
QUALITY ASSURANCE At least two (2) hours after recharging, and preferably the next day, check the settled pressure as follows: 1) Use reliable gauge and check the pressure in the Fike cylinder. 2) After determining the temperature of the cylinder, check the nominal pressure using the following fill chart. For a cylinder filled to nominal pressure of 1,920 psi (13,238 kPa), the allowable range SHALL be: a) No more than 45 psi (310.3 kPa) over the nominal, and b) No more than 55 psi (379.2 kPa) under the nominal. x The pressure in all Fike cylinders MUST fall within the above listed limits. x
7.4.3 NITROGEN CYLINDER FILL CHART The following is a fill chart showing temperature vs. pressure for 100% Nitrogen.
Temperature Degrees F Degrees C 10 -12.2 12 -11.1 14 -10.0 16 -8.9 18 -7.8 20 -6.7 22 -5.6 24 -4.4 26 -3.3 28 -2.2 30 -1.1 32 0.0 34 1.1 36 2.2 38 3.3 40 4.4 42 5.6 44 6.7 46 7.8 48 8.9 50 10.0 52 11.1 54 12.2 56 13.3 58 14.4 60 15.6 62 16.7 64 17.8 66 18.9 68 20.0 70 21.1
Micromist Nitrogen Cylinder Fill Chart Pressure Temperature PSI KPa Degrees F Degrees C 1,701 11,727 72 22.2 1,708 11,777 74 23.3 1,715 11,827 76 24.4 1,723 11,878 78 25.6 1,730 11,928 80 26.7 1,737 11,979 82 27.8 1,745 12,029 84 28.9 1,752 12,079 86 30.0 1,759 12,130 88 31.1 1,767 12,180 90 32.2 1,774 12,230 92 33.3 1,781 12,281 94 34.4 1,788 12,331 96 35.6 1,796 12,382 98 36.7 1,803 12,432 100 37.8 1,810 12,482 102 38.9 1,818 12,533 104 40.0 1,825 12,583 106 41.1 1,832 12,633 108 42.2 1,840 12,684 110 43.3 1,847 12,734 112 44.4 1,854 12,785 114 45.6 1,862 12,835 116 46.7 1,869 12,885 118 47.8 1,876 12,936 120 48.9 1,883 12,986 122 50.0 1,891 13,036 124 51.1 1,898 13,087 126 52.2 1,905 13,137 128 53.3 1,913 13,188 130 54.4 1,920 13,238
Pressure PSI KPa 1,927 13,288 1,935 13,339 1,942 13,389 1,949 13,439 1,957 13,490 1,964 13,540 1,971 13,591 1,978 13,641 1,986 13,691 1,993 13,742 2,000 13,792 2,008 13,842 2,015 13,893 2,022 13,943 2,030 13,994 2,037 14,044 2,044 14,094 2,052 14,145 2,059 14,195 2,066 14,245 2,073 14,296 2,081 14,346 2,088 14,397 2,095 14,447 2,103 14,497 2,110 14,548 2,117 14,598 2,125 14,648 2,132 14,699 2,139 14,749
Final density is 0.3359 lb.-Moles / ft3 = 0.0752 SCF / in3 = 9.4098 lb. / ft3 (150.73 kg / m3)
F.M. J.I. 3000746
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Section 7 / Page 3 of 4 Revision: 2 Revision Date: March, 2008
SYSTEM MAINTENANCE 7.5 POST FIRE MAINTENANCE Following the event of a fire, there are several procedures that must be followed before the system may be considered ready for return to service. The procedures outlined below shall be performed after it is confirmed that the fire has been extinguished: x x x x x x
Control Panel must be reset. Refer to the Cheetah Installation, Operation, and Maintenance Manual, P/N 06-148, for detailed instructions. Water Storage Container must be completely flushed and refilled. Nitrogen cylinder(s) must be recharged and/or replaced. Nozzle screens must be checked and cleaned, or replaced, to assure free flow of water through all nozzle orifices. Piping network must be examined to ensure that all connections and mounting brackets are tight and undamaged. Mechanically and/or fire damaged components must be replaced.
Section 7 / Page 4 of 4 Revision: 2 Revision Date: March, 2008
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Section 8 Parts List
PARTS LIST 8.0 PARTS LIST The following is a list of the Micromist Fire Suppression System Packages. Each Micromist package includes the water storage container and nitrogen cylinder(s), control valves, water level switch, nitrogen cylinder pressure gauge(s) with or without pressure switch(s), solenoid actuators for both air and water cylinders, all necessary bracketing and the mounting skid. 8.1 MICROMIST SYSTEM PACKAGES Micromist System Packages are available in two (2) sizes. Each size may be purchased with pressure switches as indicated below. 8.1.1
MICROMIST SYSTEM PACKAGES Part Number 73-010 73-011
8.1.2
Description 70 Gallon (265 liter) Micromist System 112 Gallon (424 liter) Micromist System
MICROMIST SYSTEM PACKAGES WITH PRESSURE SWITCH(S) Part Number 73-001 73-002
Description 70 Gallon (265 liter) Micromist System 112 Gallon (424 liter) Micromist System
8.2 MICROMIST NOZZLES Micromist nozzle assemblies utilize 1/2" NPT female connections and include nozzle screens. There are two (2) types of nozzle assemblies. Selection depends on the type of enclosure being protected as indicated. 8.2.1
MICROMIST NOZZLE ASSEMBLIES Part Number 73-0023 73-0024
F.M. J.I. 3000746
Description Nozzle Assembly for Gas Turbine Spaces – Red Sticker Nozzle Assembly for Machinery Spaces – Blue Sticker
Micromist£ Manual P/N: 06-153
Section 8 / Page 1 of 7 Revision: 2 Revision Date: March, 2008
PARTS LIST 8.3 MICROMIST SYSTEM SPARE PARTS The following spare parts are shown in the drawings found at the end of this section. Each spare part is listed with an “Item Number". This “Item Number” corresponds to the balloon numbers shown in Figures 8.3.1 through 8.3.7. Item Number 1 2 3 4 5
Part Number 02-4236 02-4472 C02-1279 02-4530 C02-1254
Description Liquid Level Switch Water Valve Hose, 1/4” JIC x 1/4” JIC x 9" Long Nipple, 1/4” NPT x 1/4” JIC Solenoid Valve, 12 VDC
6 7 8 9 9a 10
02-4538 02-4522 02-4540 73-0040 D3632-1 02-4571
Hose, 1/8” NPT x 1/4" JIC x 13-1/2” Long Water Valve Orifice Hex Nipple, 1/2" NPT Rupture Disc Assembly for Water Cylinder Rupture Disc for Water Cylinder Check Valve, 1/2" NPT
11 12 13 14 15
02-4541 02-4531 02-4574 02-4606 02-4573
Tee, 1/2" NPT Bushing, 1/2" NPT x 1/8” NPT Pressure Regulator Hose, 1/2" NPT x 1/2" JIC, 12" Long Elbow, 1/4" NPT x 1/2" JIC
16 17 18 19 20
02-4572 02-4527 02-11916 02-4566 73-0056
Hex Nipple, 1/2” NPT x 1/4” NPT Cross, 1/2" NPT Vent Valve for Water Cylinder Bushing, 1" NPT x 1/2" NPT Water Cylinder, 70 Gallon
21 22 23 24 25
02-4528 73-0034 C02-1290 02-4542 02-4535
Hex Nipple, 3/4" NPT Water Valve Adapter Hose, 1/4" JIC x 1/4" JIC x 7-1/2" Long Tee, 1/8" NPT Nipple, 1/8" NPT x 1/4" JIC
26 27 28 29 30
73-0059 73-0010 C85-1099 n/a 02-4550
Siphon Tube Assembly, 70 Gallon System Nitrogen/Air Valve Assembly Connector, Valve to Solenoid
31 32 33 34 35
02-4576 C02-1280 02-4543 02-4521 C02-1334
Coupling, 1/8" NPT x 1/4" NPT Elbow, 90q – Solenoid Valve to Hose Nipple, 1/8" NPT x 1/4" JIC Orifice, 1/8” Brass Air Valve Tee, 1/8" NPT
36 37 38 39 40
02-4231 n/a 02-4373 C70-1031 73-0039
Coupler Nut, 1/2"-13UNC
Section 8 / Page 2 of 7 Revision: 2 Date: March, 2008
Pressure Switch
Washer, 1/2" Mounting Strap, Nitrogen Cylinder Mounting Skid
Micromist£ Manual P/N: 06-153
F.M. J.I. 3000746
PARTS LIST
Item Number 41 42 43 44 45
Part Number 02-1447 E02-0290 E02-0211 02-11916 02-9899
Description Bolt, .375-16UNC-2A x1 Nut, Weld, .375-16 Lock Washer, .375 Drain Valve for Water Tank Bushing, 1 1/4" NPT x 1/2" NPT
46 47 48 49 50
02-4585 70-1384-R 73-0051 02-4230 02-4218
Filter, Inline, 1/2" NPT Mounting Strap, Water Cylinder Uni-strut£, 28" Bolt, 1/2-13UNC x 1-1/2" Long Nut, 1/2-13UNC Uni-strut£
51 52 53 54 55
02-4533 02-4536 02-4539 73-0057 73-0049
Hose, Air Valve to Regulator, 112 Gallon Tee, 1/2" NPT Tee, Branch, 1/8" NPT Water Cylinder, 112 Gallon Siphon Tube Assembly, 112 Gallon System
56 57 58 59 60
02-4532 02-4575 02-4372 n/a 73-0035
Elbow, 1/2" NPT x 1/2" JIC Nipple, 1/2" NPT x 1/4" NPT Lock Washer, 1/2"
61 62 63 64 65
n/a C02-1277 C85-1100 C02-1273 C85-1087
O-Ring for Pilot Valve Pilot Valve Assembly Spring for Main Valve Seal Main Valve Seal Assembly
66 67 68 69 70
C85-1077 C02-1275 C02-1282 C02-1276 C02-1150
Main Valve Retainer O-Ring Piston Retainer O-Ring for Top Cap O-Ring (Top / Large) for Piston O-Ring (Bottom / Small) for Piston
71 72 73 74 75
C85-1094 D3929-1 C02-1289 C02-1015 n/a
Safety Disc Nut Safety Disc Washer for Main Valve Seal Retainer Safety Disc Washer
76 77 78 79 80 Not Shown Not Shown
C02-1257 02-4603 02-4620 02-11952 n/a 73-0012 73-012
Pressure Gauge Coupling, 1/4” NPT x 1/8” Brass Drain/Fill Valve Label Elbow, 1/2” Street
F.M. J.I. 3000746
Solenoid Bracket
Nitrogen Tank Assembly Nitrogen Fill Valve Assembly
Micromist£ Manual P/N: 06-153
Section 8 / Page 3 of 7 Revision: 2 Revision Date: March, 2008
PARTS LIST
70 Gallon (265 liter) Micromist System (Overall View) Figure 8.3.1
For Low-Pressure Detail Refer to Figure 7.6
70 Gallon (265 liter) Micromist System (High-Pressure Detail) Figure 8.3.2
Section 8 / Page 4 of 7 Revision: 2 Date: March, 2008
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PARTS LIST
107 Gallon (405 liter) Micromist System (Overall View) Figure 8.3.3
107 Gallon (405 liter) Micromist System (High-Pressure Detail) Figure 8.3.4
F.M. J.I. 3000746
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Section 8 / Page 5 of 7 Revision: 2 Revision Date: March, 2008
PARTS LIST
70 Gallon (265 liter) or 112 Gallon (424 liter) Micromist System (Low-Pressure Detail) Figure 8.3.5
*15 and 26 are for a 70 Gallon System, 52 and 55 for a 112 Gallon System.
Nitrogen Valve Micromist System (Detail View) Figure 8.3.6
Section 8 / Page 6 of 7 Revision: 2 Date: March, 2008
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F.M. J.I. 3000746
PARTS LIST
Fill/ Drain Valve Micromist System (Detail View) Figure 8.3.7
F.M. J.I. 3000746
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Section 8 / Page 7 of 7 Revision: 2 Revision Date: March, 2008
704 South 10th Street P.O. Box 610 Blue Springs, Missouri 64013 U.S.A. (816) 229-3405 Fax: (816) 229-4615 http://www.fike.com
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