SP-1080 Electrical Desing Criteria
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ADMA Electrical Desing Criteria...
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ABU DHABI MARINE OPERATING COMPANY
SP-1080 Control Sheet
ADMA-OPCO STANDARD ENGINEERING DOCUMENTS
PAGE 1 of 73
COPYRIGHT © ABU DHABI MARINE OPERATING COMPANY - ADMA-OPCO
All rights reserved. The information contained in this document is regarded as confidential. Recipient(s) other than ADMAOPCO's employees undertake both during the continuance of their services to ADMA-OPCO and after termination to maintain in safe custody and not to use any such information for any purpose other than a purpose falling within the scope of the Agreement or Contract under which this document was supplied. Recipient(s) further agree not to dispose of, make copies, in whole or in part of such information or permit the use or access of the same by any Third Party unless the prior written permission of ADMA-OPCO Manager Facilities Engineering is obtained.
D O C U M E N T
SP-1080
DESIGNATION
SPECIFICATION FOR
TITLE
ELECTRICAL DESIGN CRITERIA
AUTHORITY
NAME
TITLE
TECHNICAL CUSTODIAN
Thenarasu S. Muthu
SEE
TECHNICAL
Michael J. Lyon
CEETL
STANDARDS
M. Khalid Elshobary
ESQASL
APPROVAL
Hisham Awda
MDE(A)
ENDORSEMENT Ali Al-Jarwan
AGM(P&E) Acting
B.UNIT/ DIV
SIGNATURE
DATE
P&E/ DED P&E/ DED P&E/ DED P&E/ DED P&E CONTROL STAMP
The soft copy of this document on ADMA-OPCO Web is
Controlled. When printed, it is considered
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SF / General / 001 Rev.0 sheet 1 of 1
Uncontrolled
Liability for utilization by personnel/organizations outside ADMA-OPCO Whilst every effort has been made to ensure the accuracy of this document, neither ADMA-OPCO nor its employees will assume liability for any application or use outside ADMA-OPCO premises/assets.
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TABLE OF CONTENTS 1.
INTRODUCTION....................................................................................................................... 5 1.1 OBJECTIVE................................................................................................................................5 1.2 SCOPE ........................................................................................................................................5 1.3 COVERAGE ..............................................................................................................................5 1.4 EXCLUSION .............................................................................................................................5 1.5 REFERENCES...........................................................................................................................6 1.6 ABBREVIATIONS.....................................................................................................................7 1.7 DEFINITIONS ...........................................................................................................................7 1.8 USE OF LANGUAGE ...............................................................................................................7 1.9 UNITS ........................................................................................................................................7 1.10 LESSONS LEARNT..................................................................................................................7 1.11 ENVIRONMENTAL CONDITIONS ........................................................................................8
2.
QUALITY ASSURANCE .......................................................................................................... 9 2.1 2.2 2.3
QUALITY ASSURANCE SYSTEM.........................................................................................9 QUALITY PLAN.....................................................................................................................10 INSPECTION AND CERTIFICATION REQUIREMENTS ..................................................10
3.
BASIS OF DESIGN .................................................................................................................. 11
4.
POWER SUPPLY SYSTEM ................................................................................................... 14 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8 4.9 4.10 4.11 4.12
5.
CLASSIFICATION OF HAZARDOUS AREA ................................................................... 31 5.1
6.
GENERAL ................................................................................................................................14 SYSTEM CONFIGURATION .................................................................................................15 DISTRIBUTION SYSTEM ......................................................................................................18 EQUIPMENT RATING/SIZING..............................................................................................18 SUPPLY VOLTAGE, FREQUENCY AND SUPPLY WAVEFORM.....................................19 SYSTEM POWER FACTOR ...................................................................................................20 STANDARD VOLTAGES AND TOLERANCES...................................................................20 ELECTRICAL DESIGN STUDIES..........................................................................................21 SYSTEM PROTECTION AND METERING ..........................................................................25 INTERTRIPPING AND INTERLOCKING.............................................................................26 POWER MANAGEMENT SYSTEMS (PMS).........................................................................27 EARTHING & LIGHTNING PROTECTION SYSTEMS.......................................................29
GENERAL ................................................................................................................................31
SUBSTATIONS......................................................................................................................... 32 6.1 6.2
GENERAL ................................................................................................................................32 MINIMUM CLEARANCES IN SUBSTATIONS ...................................................................34
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7.
EQUIPMENT AND MATERIALS ........................................................................................ 34 7.1 7.2 7.3 7.4 7.5 7.6 7.7 7.8 7.9 7.10 7.11 7.12 7.13
GENERATORS.........................................................................................................................34 HV SWITCHGEAR ..................................................................................................................35 TRANSFORMER ....................................................................................................................35 LV SWITCHGEAR AND MOTOR CONTROL CENTRES...................................................36 MOTORS ..................................................................................................................................36 UPS SYSTEMS.........................................................................................................................37 BATTERIES .............................................................................................................................38 CAPACITORS ..........................................................................................................................39 LOCAL MOTOR CONTROL STATIONS ..............................................................................39 CABLES AND ACCESSORIES ..............................................................................................40 LIGHTING................................................................................................................................42 SOCKET OUTLETS.................................................................................................................45 PORTABLE LAMPS ................................................................................................................46
8.
ELECTRICAL HEAT TRACING ......................................................................................... 46
9.
INSTRUMENTATION INTERFACES................................................................................. 46
10.
NON-INDUSTRIAL BUILDINGS ......................................................................................... 47
11.
MISCELLANEOUS ................................................................................................................. 48 11.1 ELECTRICAL WORKSHOP AND SAFETY KITS................................................................48
12.
SPECIFIC REQUIREMENTS FOR OFFSHORE INSTALLATIONS ........................... 48 12.1 12.2 12.3 12.4
POWER SUPPLY .....................................................................................................................48 PLATFORM SUPPLY SOCKET .............................................................................................48 JETTIES ....................................................................................................................................49 WELLHEAD TOWERS ...........................................................................................................49
13.
EQUIPMENT AND CABLE NUMBERING SYSTEM ...................................................... 51
14.
DRAWINGS AND DOCUMENTS......................................................................................... 51 14.1 GENERAL ................................................................................................................................51 14.2 REQUIREMENTS FOR DRAWING AND DOCUMENTATION .........................................52
APPENDIX-A1: ILLUMINATION LEVELS ................................................................................ 54 APPENDIX-A2: TYPICAL SCHEMES.......................................................................................... 57 APPENDIX-A3: ELECTRICAL LOAD SCHEDULE (FORMAT)............................................ 64 APPENDIX-B: ABBREVIATIONS ................................................................................................. 65 APPENDIX-C: DEFINITIONS ........................................................................................................ 67 APPENDIX-D: REFERENCED DOCUMENTS ........................................................................... 71
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1.
INTRODUCTION 1.1
Objective The objective of this Specification is to provide Electrical Design Criteria for ADMA-OPCO Projects/Works. This document stipulates the design and selection criteria for electrical equipment and system design in accordance with the latest international rules, regulations and industrial practices.
1.2
Scope This Specification specifies the minimum requirements for Design and Engineering of Electrical Facilities for ADMA-OPCO offshore and onshore operational areas. This Specification is intended to define the basic requirements to be followed by the Contractor. Nothing in this Specification shall be construed to relieve the Contractor of his contractual obligations. Any deviation from this Specification requires written approval from ADMA-OPCO. Within this Specification the basic technical features are outlined and general requirements are given. In case special requirements exist for particular locations/ applications over and above the requirements as stated in this Specification, they will be provided separately as part of the project specifics.
1.3
Coverage This Specification covers the design criteria for electrical system design, selection of equipment and materials, layout, earthing and lightning protection for new as well as existing facilities for ADMA-OPCO projects. It also includes requirements for safety, flexibility and reliability of the installations.
1.4
Exclusion This Specification excludes installation and field commissioning which is covered in ADMA-OPCO Specification SP-1083 & GDL-006. It also excludes power sources from external utility (i.e. other than ADMA-OPCO’s own generation). For the electrical design and equipment requirements associated with the external utility supplies, reference is made to the rules and regulations as stipulated by the applicable utility supplier (e.g. ADWEA).
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1.5
References
1.5.1
General The latest edition (at the time of the contract award) of the standards and amendments as listed in Appendix-D shall, to the extent specified herein, represent part of this Specification. The latest edition/revision of ADMA-OPCO Standards Engineering Documents shall be utilized as indicated in the Status List SL-001.
1.5.2
Equivalent Standards Standard Documents equivalent to those referred to herein shall not be substituted without written approval from ADMA-OPCO. Approval of equivalent Standard Documents will not, in any way, remove responsibility from the Contractor to meet the best practices and/or requirements of the Standard Engineering Documents referred to herein, in the event of conflict. Where differences and/or conflicting issues occur between the referenced documents themselves or the requirements of this document, the requirements of this document shall overrule unless otherwise advised by ADMA-OPCO. However major conflicts shall be reported in writing to the ADMA-OPCO Standards Authority/Technical Custodian appearing in the front sheet of this Procedure for arbitration/resolution. The following hierarchy of adherence to standards shall be followed: a.
Whenever ADMA-OPCO Standard Engineering Documents (SED’s) relevant to the system and/or equipment design are available, the same shall be utilized first for the purpose of design.
b.
Shareholder (BP) RP’s/GP’s (tailored to suit ADMA-OPCO needs) shall be utilized next in the hierarchy, if the relevant subject is not covered by ADMAOPCO standards.
c.
National or International standards (tailored to suit ADMA-OPCO needs) shall be utilized, if the required subject is not covered either by ADMA-OPCO or Shareholder SED’s.
The Contractor shall equip himself with copies of all the referenced Standard Engineering Documents referred in Appendix-D of this Specification and shall make them readily available to all ADMA-OPCO, or nominated representative, personnel involved in the work.
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1.6
Abbreviations The abbreviations used in this Specification are listed in Appendix-B.
1.7
Definitions The definitions used in this Specification are listed in Appendix-C.
1.8
Use of Language Throughout this document, the words ‘will’, ‘may/can’, ‘should’ and ‘shall/must’, when used in the context of actions by ADMA-OPCO or others, have specific meanings as follows: a. ‘Will’ is used normally in connection with an action by ADMA-OPCO and / or nominated representative, rather than by a Contractor or Vendor. b. ‘May / Can’ is used where alternatives / action are equally acceptable. c. ‘Should’ is used where provision is preferred. d. ‘Shall / Must’ is used where a provision is mandatory / vital.
1.9
Units Unless otherwise specified by ADMA-OPCO, SI units should be used in accordance with ISO 1000. However, Imperial units versus SI units should be quoted between brackets e.g. 30°C (86 °F).
1.10
Lessons Learnt Upon completion of works related to the scope of this document, lessons learnt shall be made available by the contractors/consultants/job officer and shall be provided to ADMA-OPCO Lessons Learnt system as appropriate.
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1.11
Environmental Conditions Following parameters shall be considered for installation works: Parameter
Description General conditions: Minimum ambient temperature: 5 °C Maximum ambient temperature: 48 °C
Temperature
Design ambient temperatures: a) For Indoor Installations: 40 °C b) For Outdoor Installations: 50 °C (Note: All components shall be capable of withstanding storage and transport temperature of 85 °C.)
Humidity
The relative humidity is high throughout the year, averaging about 70 % and reaching 95 % or more in the early morning hours, although in winter the humidity may fall below 50 % temporarily during a ‘Shamal’. Design relative humidity: 95 %
Altitude
Sea level
Atmosphere
Salipherous and corrosive, often containing fine dust and pollutant, in particular traces of carbon dioxide and hydrogen Sulphide. Dust storms are commonly associated with ‘Shamals’.
Dust storms
This fine dust has extremely high mobility and can penetrate normally dustproof enclosures. All measures shall be taken to protect such ingress of dust and prevent subsequent accumulation within equipment and cause malfunction. Relatively rare and amounts are small.
Rainfall
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Measurable rainfall usually occurs on an average of about 10 days per year.
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2.
QUALITY ASSURANCE 2.1
Quality Assurance System
2.1.1
All activities & services associated with the scope of this Specification shall be performed by Contractors/ Vendors approved by ADMA-OPCO.
2.1.2
The Contractor/Vendor shall operate a Quality Management System (QMS) within his organization, which ensures that the requirements of this Specification are fully met.
2.1.3
The Contractor/ Vendor’s quality management system shall be based on ADMAOPCO Specification SP-1009 or the latest issue of ISO 9001 Series and accredited by an international certifying agency. The Contractor’s quality manual shall provide details for the preparation of a quality plan, which shall include provisions for the QA/QC of services activities. Where an approved Contractor/ Vendor revises their Quality Management System that affect the ADMA-OPCO approved Quality / Inspection & Test Plan, then the revised Quality Plan / Inspection & Test Plan shall be submitted for ADMA-OPCO approval before initiating any service activities.
2.1.4
The effectiveness of the Contractor’s quality management system may be subject to monitoring by ADMA-OPCO or its representative and may be audited following an agreed period of notice.
2.1.5
The Contractor/ Vendor shall make regular QA audits on all their Sub-contractors/ Vendors. Details of these audits shall be made available to ADMA-OPCO when requested.
2.1.6
The Contractor/ Vendor shall maintain sufficient Inspection and Quality Assurance staff, independent of the service provider management, to ensure that the QMS is correctly implemented and that all related documentation is available.
2.1.7
Using Sub-contractors is not allowed for services/functions carried out by the Contractor without the approval from ADMA-OPCO.
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2.2
Quality Plan
2.2.1
Contracted activities associated with the scope of this specification shall be performed in accordance with an approved Quality Plan.
2.2.2
The level of detail required in the Quality Plan shall be commensurate with the scope of services provided.
2.2.3
The quality of works is an essential factor in carrying out all services & activities covered by this document.
2.2.4
During services/activities, quality assurance/quality control issues are the responsibility of the Contractor, and shall be approved and certified by TPA.
2.2.5
Conflicts between contractor & TPA shall be reported in writing to ADMA-OPCO for resolution.
2.3
Inspection and Certification Requirements For all major equipment like generators, variable speed drive systems, switchgear, transformers and UPS systems, the VENDOR shall submit type test reports of the equipment at the tendering stage of an enquiry. Furthermore, certificates or declarations of conformity for equipment in hazardous areas shall be required. All equipment and devices sourced from European Vendor’s and installed in hazardous area shall be as per ATEX directives. Details of tests to be performed on electrical equipment are covered in respective equipment standards. The VENDOR of such equipment shall ensure that these Inspection and certification requirements for material shall be certified to ADMA-OPCO CP-102 and BS EN 10204.
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3.
BASIS OF DESIGN
3.1
The particular project design shall commence with project specific design criteria, which shall be prepared by the Contractor and submitted for ADMA-OPCO approval.
3.2
The design and engineering of the electrical installation shall satisfy all relevant ADMA-OPCO Standards, Safety Codes and Practices and when applicable statutory requirements of any local authorities and the requirements included in this document.
3.3
The design of the electrical systems shall be based on the following key aspects: a. Safety of personnel and equipment during operation and maintenance.
3.4
b.
Reliability of supply of primary electrical power source and distribution system.
c.
Accessibility.
d.
Simplicity of operation.
e.
Voltage regulation throughout the distribution system.
f.
Frequency stability.
g.
Flexibility to expand and adapt.
h.
Cost effective.
The power distribution system planning and design shall consider the following: a. Electrical load definition, load forecasting and locations of major equipment. b.
c. d.
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Allow operation and maintenance of the system safely without unduly affecting the production of the plant and remote operation from a centralized control room, or technical room.
The loads shall be classified as: Vital, Emergency, Essential, Normal and temporary, as per following definitions: a.
0
Appropriate power distribution philosophy, utilization voltages, maximum continuity of supply to users, protection, monitoring and control, communication etc. Provide reliable power sources for essential/emergency loads.
Vital / very essential loads: Loads affecting the safety management systems such as Fire and Gas, Public address, Emergency Shutdown Systems, High Integrity Protection Systems and critical telecommunication systems. The Vital loads shall be supplied by means of battery back-up UPS systems.
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b.
Emergency loads: Loads affecting personal safety, means of escape and emergency response capabilities, whether directly or indirectly and a risk of major damage to installation or equipment. These loads shall include but not be limited to: b1.
Emergency lighting.
b2.
Aeronautical equipment (e.g. Non Directional beacon).
b3.
Black start utilities (in case no Essential generator is provided).
b4.
One supply to the AC or DC UPS system.
b5.
Critical HVAC loads, such as Control room HVAC systems.
b6.
Food cold stores.
b7.
Supply to battery back-up systems for critical communication systems.
b8.
Radar systems.
b9.
Life boat battery chargers.
b10. Fire water main and jockey pumps (if electrically driven). b11. Battery systems for run down lub oil pumps (please note that in case an Essential generator is available, this load shall be fed from the Essential system). b12. Ventilation systems for battery rooms. b13. HVAC systems for UPS rooms. b14. Emergency generator and switchgear room ventilation and air conditioning. b15. Man overboard search lights. b16. Instrument air compressor (in case of 2 * 100 % instrument air compressors, one shall be supplied from the emergency generator and one from the normal power generation). b17. Potable water systems for living quarters. b18. Battery chargers for portable hand lamps. In case the emergency generator is adequately sized and relatively close to the main gas turbine generator starter motors, there will be no need to include a separate essential generator within the design.
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c.
Essential loads: Loads involved in the restarting of the installation in case the emergency generator has insufficient capacity to energize the main gas turbine starter motors or in case the emergency generator is too remote to allow the transfer of energy to the main gas turbine starter motors. The essential generator shall be automatically started on loss of normal supply. It shall be possible to select auto mode (automatic start) or manual mode (operator start) by means of a selector switch. The essential loads shall include but not be limited to: c1.
HVAC for switchgear rooms.
c2.
Black start utilities (in case the Emergency generator is inadequate or too remotely located).
c3.
Lighting systems required for start-up.
c4.
Battery systems for run down lub oil pumps.
d.
Normal loads: Loads, which have no effect either on the safety or the safeguard of installation or equipment.
e.
Temporary loads: Loads which have no effect on the normal production or safety, but are intended to supply the loads for temporary services during Onshore or Offshore construction activities or during operations. Normally these loads shall be supplied, by temporary generators which shall be located in non-hazardous areas.
For offshore telecommunication applications and navigational aids dedicated battery back-up supply systems shall be provided in accordance with SOLAS regulations. For all types of load the load schedule as provided in Appendix-A3 shall be applied, clearly indicating the type of load in the heading.
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4.
POWER SUPPLY SYSTEM 4.1
General The design and construction of the electrical systems shall take into consideration potential alternatives for the supply of electricity such as ADMA-OPCO’s own generation systems and outside supplies through local utility suppliers. A combination of these two alternatives shall be considered to provide the most economical and reliable solution.
4.1.1
Power Supply required for the ADMA-OPCO onshore facilities and offshore is presently by dedicated power generation. Reference is made to the typical offshore and onshore Key One line diagrams (See Figs.1&2, Appendix-A2). Please note that referenced typicals are indicative and shall be adapted to project specific requirements on a case to case basis, subject to ADMA-OPCO’s approval.
4.1.2
The firm capacity of normal electrical power system shall be capable of supplying continuously 120 % of peak load, without exceeding the specified voltage limits, frequency limits and equipment ratings.
4.1.3
For offshore application the power generation system shall follow a N-1 philosophy, meaning that N generators minus the largest generator can continuously supply 120 % of the peak load.
4.1.4
For onshore application the power generation system shall follow a N-2 philosophy, meaning that N generators minus the two largest generator can continuously supply 120 % of the peak load.
4.1.5
The number and size of generators selected will be a result of a joint technical and economical study by the Contractor and ADMA-OPCO.
4.1.6
For subsea cables a spare capacity of 20 % peak load shall be taken into account.
4.1.7
If the sole source of power for the production and utilities is derived from a subsea power cable, the subsea power cable shall be redundant. Each subsea cable shall be routed via a different route so that no single event can cause the loss of both the subsea cables.
4.1.8
For general considerations of prevention of installation interference between subsea cable and subsea pipelines reference is made to ADMA-OPCO SP-1048, and SP1056.
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4.1.9
For subsea cable installation, pre-installation surveys shall be performed to check the status of the desired route. For installation, appropriate vessels and equipment such as motorized rim reel drive, tensioner, bend restrictors, sand bags, etc. shall be applied. As a standard requirement, sand bags shall be used to protect the cable against vortex shedding induced vibrations. Post lay surveys shall be performed to check the status of the cable after installation and also to confirm distances between cable and the existing infield pipelines.
4.1.10 The subsea cable and associated equipment and installation methods shall be in accordance with the project specific requirements and subject to ADMA-OPCO approval. 4.2
System Configuration The principle system design shall comprise of a HV and LV Normal, Essential Emergency and Vital (UPS) generation and distribution system as shown in Appendix-A2 (fig. 1&2). The UPS system and distribution panels shall be designed in such a way that maintenance can be performed in a safe manner on one side of the system while the other side remains live without disruption of UPS power to consumers.
4.2.1
4.2.2
H V System a.
The main HV switchboard is connected directly or through unit transformers to the local generation units.
b.
HV switchgear with at least two power supplies shall have two bus-sections and a bus-tie rated for the total load on the switchgear including a minimum spare margin of 20 %. In order to increase the availability, redundant equipment shall be judiciously split between the two bus-sections. The HV switchboard shall normally operate with the bus-tie closed; however during maintenance activities one section might be out of service while one section is maintained life, therefore both sections have to operate independently.
Emergency Power System The emergency generator system can be utilized to provide both the emergency and black start services. In case the required black start power supply and other essential demands are such that a dedicated essential generator and associated equipment proves a necessity, the requirements as stipulated below shall both apply to the essential as emergency generation system. However in case of offshore application, the emergency generator and associated systems and the installations shall be certified by a certifying authority as per ADMA-OPCO approved TPA list. a.
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The emergency generator(s) shall receive a start signal upon loss of voltage at the emergency service switchboard and automatically feed the emergency loads with minimum interruption. Issued For Implementation Description / Text Affected ELECTRICAL DESIGN CRITERIA
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4.2.3
b.
For normal power recovery, synchronization between the main and the essential sources shall be provided. Upon restoration of the main generation, the generator shall be stopped manually.
c.
Provisions shall also be made to test periodically the start up and loading of the emergency generator. This will require synchronization of the generator with the normal generation system at the emergency switchboard.
d.
The Emergency and Essential generator shall have a primary and a secondary start system. Each system with sufficient stored energy to provide a minimum of six starts equivalent to 180 seconds of cranking time at an ambient temperature of 5 °C. Thus providing a total of twelve consecutive starts with a total cranking time of 360 seconds at an ambient temperature of 5 °C.
e.
The Emergency generator shall be equipped with a diesel day tank sized for twenty four hours full load.
f.
The Essential generator shall be provided with a diesel day tank sized in accordance with the project specific requirements. The Essential generator shall supply the diesel transfer pumps to guarantee a continuous flow of diesel from the main diesel fuel storage tanks. In case no Essential generator is required the fuel transfer pumps (or one of the fuel transfer pumps in case the system is configured as 2 * 100 %) shall be supplied from the emergency diesel generator. This will only be applicable if the main normal power generation system is suitable for dual fuel or includes diesel generator.
LV System a.
Low voltage switchgear and Motor Control Centres (MCC’s) shall have two incomers and one tie breaker. MCC’s for turbo generator/ turbo compressor/ HVAC auxiliaries and LV switchgear where only one incomer is sufficient, with specific notification to ADMA-OPCO, the same can be provided.
b.
The two bus sections (A and B), and associated incoming breaker (A and B) and bus-tie breaker (C) can be in the following configurations: b1. Incoming circuit breakers A and B closed and the bus-tie C open. b2. Incoming circuit breaker A and the bus-tie C closed, incoming B open. b3. Incoming circuit breaker B and the bus-tie C closed, incoming A open. The configuration b1. Represents the normal operating condition. The configurations b2. and b3. may be used during maintenance on one of the incoming feeder. Transfer from one configuration to another one, shall not cause any loss of supply to consumers, (make before break).
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4.2.4
c.
The short-circuit rating of the switchboard however, is not required to be calculated to cover for this condition as the risk of a fault occurring at the instant when all three circuit breakers are closed is considered extremely unlikely. In all cases, the three circuit breakers shall never be simultaneously closed for more than one (1) second as described above. Key lockable switches and clear instruction plates at the front of the switchboard shall be provided, to prevent any miss operation.
d.
For essential and process sensitive loads, as per project specific requirements, separate LV switchboard/ MCC’s shall be used with bus-tie closed to allow for uninterrupted operation of the connected loads during failure of any single source. In such cases the short-circuit current on the bus shall be calculated for closed bus-tie and both incomers feeding the fault. The switchboard shortcircuit rating shall be calculated accordingly.
e.
Note that after a complete shut down all battery supplies of the Vital system might be drained, therefore ESD overrides shall be implemented allowing the Emergency generator to start after a total outage. These overrides shall be key operated with clear instruction plates and shall be executed suitable for Zone 1, IIB, T3 area’s, in case these are located in battery rooms the classification shall be Zone 1, IIC, T6.
f.
HVAC drives may be fed in the following manner as specified in the project scope, either: f1. Starters integrated into Normal/Emergency switchgear. f2. From a dedicated HVAC switchgear (with normal and essential sections). Each section being fed by one feeder from a Normal switchboard and one feeder from an Emergency switchboard. f3. From separate dedicated normal and essential HVAC switchboards, each being fed by one feeder from the respective electrical board.
Transformers Each power transformer shall be able to feed the total load of its downstream switchboard. In normal configuration, the two transformers shall feed each half of the bus section, each providing around 50 % of the load. Transformers shall have a 20 % spare capacity. Transformers shall comply with ADMA-OPCO STD-155.
4.2.5
Distribution Boards Distribution boards (e.g. for lighting and small power) shall be normally fed by only one feeder coming from an upstream board. For Vital loads (eg. DC and AC UPS), two feeders shall be required as specified in the data sheet.
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4.3
Distribution System
4.3.1
Main Power distribution within the ADMA-OPCO onshore and offshore facilities is High Voltage (HV) (11 kV and/or 33 kV (future)) unless otherwise specified or indicated in single line diagrams.
4.3.2
On-site power generator circuits shall be connected at a common primary substation, the common primary sub station shall be used as the main load distribution center for the site facility.
4.3.3
Outgoing load circuits shall be connected to the bus sections in such a way, that power flow across bus bar section switches is minimized and shall in addition permit unscheduled and scheduled bus bar section outages with minimum disturbance to the connected loads.
4.3.4
On-site power generators may be connected either directly to the primary power supply bus bars or via generator/transformers.
4.3.5
Different configurations of power supply schemes are existing in ADMA-OPCO onshore and offshore facilities. General schematic of the same are shown in Appendix-A2 Figures 1&2 respectively.
4.3.6
11 kV bus bars in the Main Receiving Station/Sub-station shall be continuous with bus section breakers in normally closed position.
4.3.7
Feeders to continuous process unit Sub-stations shall be radial type. Each unit Substation shall have two 120 % rated 11 kV feeders terminating directly on a 11kV switchgear or transformers, pending project specific requirement.
4.4
Equipment Rating/Sizing
4.4.1
Equipment sizing for each installation shall be such that all extensions known at design phase shall be taken into account.
4.4.2
All components (e.g. bus bars, circuit breakers, contactors, switches, etc.) and cables shall be rated for at least the fault rating of the equipment in which they are installed.
4.4.3
In particular, the short-circuit rating of the generator switchgear shall be calculated taking into account all generators running and connected simultaneously. Any additional future contribution (e.g. future extra generators or incomers) shall be specifically mentioned in the project specifics and taken into account accordingly.
4.4.4
The short-circuit rating of LV switchboards shall be determined with one transformer in operation (bus-tie closed) and all the LV consumers in service.
0
02-08
Rev
Date
Issued For Implementation Description / Text Affected ELECTRICAL DESIGN CRITERIA
ADMA-OPCO SF / General / 002 Rev.0 sheet 1 of 1
SP-1080
PAGE 18
4.5
Supply Voltage, Frequency and Supply Waveform a.
Voltage at equipment terminals shall not deviate from the rated equipment voltage by more than ±5 %.
b.
System frequency shall not deviate from the rated frequency (50Hz) by more than ±2 %, during transient conditions a maximum frequency deviation of ±5 % is permitted for short periods of time (
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