NPSH Calculator For Process Engineer

December 6, 2017 | Author: Tony | Category: Pressure, Pump, Pipe (Fluid Conveyance), Valve, Plumbing
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Short Description

NPSH Calculator_V1.03 Shared with permittance from author.You can use this for NPSH Calculation...

Description

NPSH Calculator Author: Dimitrii Pokrovskii [email protected] www.engineering-bear.com

www.azpiping.com

Nov. 16th, 2007, Brought to you by

with permittance from Author

1 - Start

2

Pump Operating Parameters

System Inlet Height Configur Open System:

Fluid Temperature (through the pump): Total Pump Volumetric Flow Rate:

(32 - 212 F)

Atmospheroc Pressure:

(can't change)

Fluid Vapor Pressure:

45 deg. F 0 gpm 14.7 PSI 33.96 ft. Water 0.75 (ft. Water)

Surface Pressure 0

Water Vapor Pressure Reference Table Water Temp. Vapor Pressure (Deg. F) (ft. Water) 80 1 100 2 120 4 140 7 180 18 200 28 212 33.96

liquid level

Water Vapor Pres. @ Sea Level

Vapor Pres.(ft. Water)

35 30 25 20 15 10 5 0 75

100

125

150

175

Temperature Deg. F

liquid level

200

225

Each sub system is defined by a fitting that either changes the pipe size or a Tee that combines or separates flow.

from Author

2

3-

Inlet Height Configuration

System Piping Configuration 1 Pipe Type

Schedule 40 1 0 0

Pipe Size (Nominal) Pipe Length Flow Rate (Positive) Height h

Fittings 90 Ells 45 Ell Globe Valve Angle Valve Ball Valve BF-Valve Ck-Valve Stand. Tee - flow through run Stand. Tee - flow through branch -

inlet Surface Pressure PSIG inlet -h (Negative) Height

4 Height:

Static Head 0 ft.

Qt.

(Optional) Pipe Type Pipe Size (Nominal) Pipe Length Flow Rate

Fittings Qt. 90 Ells 45 Ell Globe Valve Angle Valve Ball Valve BF-Valve Ck-Valve Stand. Tee - flow through run Stand. Tee - flow through branch -

Eq. Length 0 20 0 16 0 340 0 150 0 8 0 29.9 0 55 0 20 0 60 0 0 Total Eq. Length

Schedule 40 1 0 0

Eq. Length 0 20 0 16 0 340 0 150 0 8 0 29.9 0 55 0 20 0 60 0 0 Total Eq. Length

Design Calculator - Do not Edit Values Here

Total Fitting Eq. L NA NA NA NA Ref. NA NA NA NA NA 1 4 2 5 3 6

Nominal Diam.

Pipe Length (ft.) NA NA NA NA NA NA NA NA NA 0 0 0 0 0 0

0 0 0 0 0 0

1 2 3 4 5 6 8 10 12 14 1 1 1 1 1 1

ID (inch) 1.05 2.07 3.07 4.03 5.05 6.07 8.07 10.14 12.09 13.13 1.049 1.049 1.049 1.049 1.049 1.049

3 - When You're Done W/ Step 3 - Press the Calculate NPSH Button 2 inch ft gpm

Total

Fittings Qt. 90 Ells 45 Ell Globe Valve Angle Valve Ball Valve BF-Valve Ck-Valve Stand. Tee - flow through run Stand. Tee - flow through branch -

0 0 0 0 0 0 0 0 0 0 0

5 inch ft gpm

Total 0 0 0 0 0 0 0 0 0 0 0

(Optional) Pipe Type Pipe Size (Nominal) Pipe Length Flow Rate

(Optional) Pipe Type Pipe Size (Nominal) Pipe Length Flow Rate

Fittings Qt. 90 Ells 45 Ell Globe Valve Angle Valve Ball Valve BF-Valve Ck-Valve Stand. Tee - flow through run Stand. Tee - flow through branch -

Schedule 40 1 inch 0 ft 0 gpm

Eq. Length 0 20 0 16 0 340 0 150 0 8 0 29.9 0 55 0 20 0 60 0 0 Total Eq. Length

Total 0 0 0 0 0 0 0 0 0 0 0

Schedule 40 1 inch 0 ft 0 gpm

Eq. Length 0 20 0 16 0 340 0 150 0 8 0 29.9 0 55 0 20 0 60 0 0 Total Eq. Length

Total 0 0 0 0 0 0 0 0 0 0 0

Rel. Roughness e=

Pipe ID Area (inch^2) Flow GPM 0.86 NA 3.36 NA 7.39 NA 12.73 NA 20.01 NA 28.89 NA 51.16 NA 80.69 NA 114.8 NA 135.3 NA 0.86 0.86 0.86 0.86 0.86 0.86

Flow (ft^3/s) Velocity (ft/s) 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0

Re

Friction Factor 0 NA 0 NA 0 NA 0 NA 0 NA 0 NA 0 NA 0 NA 0 NA 0 0 0.0009533 0.01 0.0009533 0.01 0.0009533 0.01 0.0009533 0.01 0.0009533 0.01 0.00095329 0.01 Total Frictional Head L

e/D

0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000

0 0 0 0 0 0 0 0 0

0.000 0.000 0.000 0.000 0.000 0.000

0 0 0 0 0 0

ate NPSH Button 3

(Optional) Pipe Type Pipe Size (Nominal) Pipe Length Flow Rate

Schedule 40 1 inch 0 ft 0 gpm

Fittings Qt. Eq. Length 90 Ells 0 20 45 Ell 0 16 Globe Valve 0 340 Angle Valve 0 150 Ball Valve 0 8 BF-Valve 0 29.9 Ck-Valve 0 55 Stand. Tee - flow through run 0 20 Stand. Tee - flow through branch0 60 0 0 Total Eq. Length

6

(Optional) Pipe Type Pipe Size (Nominal) Pipe Length Flow Rate

Total 0 0 0 0 0 0 0 0 0 0 0

Schedule 40 1 inch 0 ft 0 gpm

Fittings Qt. Eq. Length 90 Ells 0 20 45 Ell 0 16 Globe Valve 0 340 Angle Valve 0 150 Ball Valve 0 8 BF-Valve 0 29.9 Ck-Valve 0 55 Stand. Tee - flow through run 0 20 Stand. Tee - flow through branch0 60 0 0 Total Eq. Length

Total 0 0 0 0 0 0 0 0 0 0 0

Safety Factor Piping Fittings

HEAD Fittings NA NA NA NA NA NA NA NA NA NA

1.3 1.3 HEAD LOSS

Head Pipe NA NA NA NA NA NA NA NA NA NA

0 0 0 0 0 0 0 0 0 0 0 0 Total Frictional Head Loss:

Sum NA NA NA NA NA NA NA NA NA NA 0 0 0 0 0 0 ft. water 0 PSI 0

13769344.xls

Date: Job Name: Drawings / Page: Max GPM:

NPSH Calculation

1/31/2009 7:28

Address:

Constants / Assumptions: Mean Operating Fluid Temperature:

45 ºF

Total Flow Through Pump:

0 gpm

Pumped Fluid: WATER

Vapor Pressure of Liquid:

0.75 ft. water

Atmospheric Pressure:

14.70 PSIA

33.96 ft. Water

Surface Pressure:

0 PSIG

(if exposed to air surface pressure = 0)

Piping Configuration: Pipe Sub System#: Pipe Diam. (Nom): Pipe Length: Flow Rate:

1

2

1 inch 0 feet 0 gpm

Pipe Pressure Drop: 0.0 ft. Water 0.0 psi Valves (Fully Open) / Fittings

Qt. 90 Ells 45 Ell Globe Valve Angle Valve Ball Valve BF-Valve Ck-Valve Stand. Tee - flow through run Stand. Tee - flow through branch Eq. Length Total:

0 0 0 0 0 0 0 0 0 0

1 Eq. Length Total 20 0 16 0 340 0 150 0 8 0 29.9 0 55 0 20 0 60 0 0 0 0

Fitting Pressure Drop: 0.0 ft. water 0.0 psi

Additonal Pressure Drops:

3

4

5

6

1 inch 0 feet 0 gpm

1 inch 0 feet 0 gpm

1 inch 0 feet 0 gpm

1 inch 0 feet 0 gpm

1 inch 0 feet 0 gpm

0.0 ft. Water 0.0 psi

0.0 ft. Water 0.0 psi

0.0 ft. Water 0.0 psi

0.0 ft. Water 0.0 psi

0.0 ft. Water 0.0 psi

Qt. 0 0 0 0 0 0 0 0 0 0

2 Eq. Length Total 20 0 16 0 340 0 150 0 8 0 29.9 0 55 0 20 0 60 0 0 0 0

0.0 ft. water 0.0 psi

Qt. 0 0 0 0 0 0 0 0 0 0

3 Eq. Length Total 20 0 16 0 340 0 150 0 8 0 29.9 0 55 0 20 0 60 0 0 0 0

0.0 ft. water 0.0 psi

Description input here input here input here input here input here Total:

0.0 0.0 0.0 0.0 0.0 0.0

Qt. 0 0 0 0 0 0 0 0 0 0

4 Eq. Length Total 20 0 16 0 340 0 150 0 8 0 29.9 0 55 0 20 0 60 0 0 0 0

Qt. 0 0 0 0 0 0 0 0 0 0

0.0 ft. water 0.0 psi

5 Eq. Length Total 20 0 16 0 340 0 150 0 8 0 29.9 0 55 0 20 0 60 0 0 0 0

0.0 ft. water 0.0 psi

ft. water ft. water ft. water ft. water ft. water ft. water

Qt. 0 0 0 0 0 0 0 0 0 0

Total 0.0 0.0

6 Eq. Length Total 20 0 16 0 340 0 150 0 8 0 29.9 0 55 0 20 0 60 0 0 0 0

0.0 ft. water 0.0 psi

Total 0 0.0 0.0

Total Head Loss (Pipe + Fittings + Additional Drops) :

0.0

Results (Static Head)

NPSHA

(Vapor Pressure)

+ + = 34.0 0.0 0.0 (Atmospheric Pressure) (Surface Pressure) Net Positive Suction Head Available Pump Schedule #: MFR: Model #:

0.8

(Loss in Fittings)

-

0.0 (Loss in Pipe Length)

0.0

NPSHA

-

0.0 (Additonal Loss)

=

NPSHR Net Positive Suction Head Required (From Pump Curve)

33.21

ft. Water

0

ft. Water

Safety Factor Enter NPSHR

Air Systems Confidential

01/31/2009

Page 9

PDF Table of Schedule 40 & 80 Pipe Geometry

Adobe Acrobat 7.0 Document

Nom. Diam. Inchs 1/8 1/4 3/8 1/2 3/4 1 1 1/4 1 1/2 2 2 1/2 3 3 1/2 4 5 6 8 10 12 14 16 18 20 24

Schedule 80

Schedule 40

ID ID Inches Inches 0.27 0.22 0.36 0.3 0.49 0.42 0.62 0.55 0.82 0.74 1.05 0.96 1.38 1.28 1.61 1.5 2.07 1.94 2.47 2.32 3.07 2.9 3.55 3.36 4.03 3.83 5.05 4.81 6.07 5.76 7.98 7.63 10.02 9.56 11.94 11.38 13.12 12.5 15 14.31 16.87 16.13 18.81 17.94 22.63 21.56

This Data is for Development Purposes

Note: Trying tofigure out how my fluids results compare to the table values found in the hand looks like there is a safety factor associated with the table values when compared to the theo Pressure Drop in 100 ft. of Pipe My Value Flow Wheel DI GPM 1.85 2.4 3 100 1.5 1.95 3 90 0.92 1.2 3 70 0.68 0.9 3 60 2.7 2.7 5 400 1.6 1.6 5 300 2.4 2.3 6 700 1.2 1.3 8 900 1.5 1.6 8 1000

Rel. Roughtness e = 0.001 Ratio 1.0 Rel. Roughness e = 0.001 Ration 1.3

2.75

ASHRAE Value

2.5 2.25 2 1.75 1.5 1.25 1

1.2 1.4 1.6 1.8

2

My Value

2.2 2.4 2.6 2.8

ASHRAE Value

re to the table values found in the handbook and the pump wheel table values when compared to the theoretical values. More testing needs to be done with a wider range of flows and pipe sizes 2.5 2.25 2 1.75 1.5 1.25 1 0.75 0.6

0.8

1

1.2

1.4

My Value

1.6

1.8

2

e of flows and pipe sizes

ASI-NPSH Calculator VS HVAC PUMP Handbook

1000 1500 2000 2250 2500 2750 3000 3250 3500 3750 4000 4250 4500 4750 5000 5250 5000

Asi Calculator Head Loss for 100 ft of Pipe (ft of Water)

Handbook Head Loss for 100ft of Pipe (ft of Water)

Flow Rate (GPM)

HVAC PUMP Handbook - Author: James B. Rishel

View more...

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