NPSH CalculatorAuthor: Dimitrii Pokrovskii

Nov. 16th, 2007, Brought to you by with permittance from Author

1 - Start 2Pump Operating Parameters System Inlet Height Configuration

Open System:

Fluid Temperature (through the pump): (32 - 212 F) 45 deg. FTotal Pump Volumetric Flow Rate: 0 gpm

Atmospheroc Pressure: (can't change)14.7 PSI

33.957 ft. WaterFluid Vapor Pressure: 0.7516 (ft. Water)

Surface PressureWater Vapor Pressure Reference Table 0Water Temp. Vapor Pressure(Deg. F) (ft. Water)

80 1100 2120 4140 7180 18200 28

212 33.96

dimitrii@engineering-bear.com www.engineering-bear.com

www.azpiping.com

60 80 100 120 140 160 180 200 220

0

5

10

15

20

25

30

35

40

f(x) = 7.1929E-06 x³ − 9.8352E-04 x² + 4.6395E-02 x

Water Vapor Pres. @ Sea Level

Temperature Deg. F

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liquid level

with permittance from Author

2 3 - When You're Done W/ Step 3 - Press the Calculate NPSH ButtonSystem Inlet Height Configuration System Piping Configuration

1 Pipe Type Schedule 40Pipe Size (Nominal) 1Pipe Length 0Flow Rate 0

Fittings Qt. Eq. Length90 Ells 0 2045 Ell 0 16Globe Valve 0 340Angle Valve 0 150

Surface Pressure Ball Valve 0 8PSIG BF-Valve 0 29.9

Ck-Valve 0 55Stand. Tee - flow through run 0 20

Stand. Tee - flow through branch 0 60- 0 0

Total Eq. Length

(Optional)

4 Pipe Type Schedule 40Pipe Size (Nominal) 1

Static Head Pipe Length 0Height: 0 ft. Flow Rate 0

Fittings Qt. Eq. Length90 Ells 0 2045 Ell 0 16Globe Valve 0 340Angle Valve 0 150Ball Valve 0 8BF-Valve 0 29.9Ck-Valve 0 55Stand. Tee - flow through ru 0 20Stand. Tee - flow through br 0 60- 0 0

Total Eq. Length

h

-h

inlet

inlet

(Positive) Height

(Negative) Height

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

Design Calculator - Do not Edit Values Here

Pipe Length (ft.) ID (inch)

Ref.

NA NA 1 1.049NA NA 2 2.067NA NA 3 3.068NA NA 4 4.026NA NA 5 5.047NA NA 6 6.065NA NA 8 8.071NA NA 10 10.136NA NA 12 12.09

14 13.1251 0 0 1 1.0494 0 0 1 1.0492 0 0 1 1.0495 0 0 1 1.0493 0 0 1 1.0496 0 0 1 1.049

Total Fitting Eq. L

Nominal Diam.

3 - When You're Done W/ Step 3 - Press the Calculate NPSH Button(Optional)

2 Pipe Type Schedule 40inch Pipe Size (Nominal) 1 inchft Pipe Length 0 ftgpm Flow Rate 0 gpm

Total Fittings Qt. Eq. Length Total0 90 Ells 0 20 00 45 Ell 0 16 00 Globe Valve 0 340 00 Angle Valve 0 150 00 Ball Valve 0 8 00 BF-Valve 0 29.9 00 Ck-Valve 0 55 00 Stand. Tee - flow throug 0 20 00 Stand. Tee - flow throug 0 60 00 - 0 0 00 Total Eq. Length 0

(Optional)

5 Pipe Type Schedule 40inch Pipe Size (Nominal) 1 inchft Pipe Length 0 ftgpm Flow Rate 0 gpm

Total Fittings Qt. Eq. Length Total0 90 Ells 0 20 00 45 Ell 0 16 00 Globe Valve 0 340 00 Angle Valve 0 150 00 Ball Valve 0 8 00 BF-Valve 0 29.9 00 Ck-Valve 0 55 00 Stand. Tee - flow throug 0 20 00 Stand. Tee - flow throug 0 60 00 - 0 0 00 Total Eq. Length 0

Rel. Roughnesse = 0.001

Flow GPM Flow (ft^3/s) Velocity (ft/s) Re e/D0.8642529244 NA 0 0.000 0 0.00095329 NA3.3556050137 NA 0 0.000 0 0.00048379 NA7.3926576024 NA 0 0.000 0 0.00032595 NA12.730264362 NA 0 0.000 0 0.00024839 NA20.005826166 NA 0 0.000 0 0.00019814 NA28.890262757 NA 0 0.000 0 0.00016488 NA51.161653963 NA 0 0.000 0 0.0001239 NA80.690626069 NA 0 0.000 0 9.8658E-05 NA114.80015729 NA 0 0.000 0 8.2713E-05 NA135.29710549 NA 0 7.619E-05 00.8642529244 0 0 0.000 0 0.0009533 0.0129150.8642529244 0 0 0.000 0 0.0009533 0.0118020.8642529244 0 0 0.000 0 0.0009533 0.0122840.8642529244 0 0 0.000 0 0.0009533 0.0115140.8642529244 0 0 0.000 0 0.0009533 0.0121850.8642529244 0 0 0.000 0 0.00095329 0.011514

Total Frictional Head Loss:

Pipe ID Area (inch^2)

Friction Factor

3 - When You're Done W/ Step 3 - Press the Calculate NPSH Button(Optional)

3 Pipe Type Schedule 40Pipe Size (Nominal) 1 inchPipe Length 0 ftFlow Rate 0 gpm

Fittings Qt. Eq. Length Total90 Ells 0 20 045 Ell 0 16 0Globe Valve 0 340 0Angle Valve 0 150 0Ball Valve 0 8 0BF-Valve 0 29.9 0Ck-Valve 0 55 0Stand. Tee - flow thro 0 20 0Stand. Tee - flow thro 0 60 0- 0 0 0

Total Eq. Length 0

(Optional)

6 Pipe Type Schedule 40Pipe Size (Nominal) 1 inchPipe Length 0 ftFlow Rate 0 gpm

Fittings Qt. Eq. Length Total90 Ells 0 20 045 Ell 0 16 0Globe Valve 0 340 0Angle Valve 0 150 0Ball Valve 0 8 0BF-Valve 0 29.9 0Ck-Valve 0 55 0Stand. Tee - flow thro 0 20 0Stand. Tee - flow thro 0 60 0- 0 0 0

Total Eq. Length 0

Safety FactorPiping 1.3Fittings 1.3

HEAD LOSS

SumNA NA NANA NA NANA NA NANA NA NANA NA NANA NA NANA NA NANA NA NANA NA NANA NA NA

0 0 00 0 00 0 00 0 00 0 00 0 0 ft. water

Total Frictional Head Loss: 0 PSI0

HEAD Fittings

Head Pipe

document.xls

Air Systems Confidential 04/08/2023 Page 9

Date: 4/8/2023 9:35 NPSH CalculationJob Name: Address:

Drawings / Page:Max GPM:

Constants / Assumptions:

Mean Operating Fluid Temperature: 45 ºF Total Flow Through Pump: 0 gpm Atmospheric Pressure: 14.70 PSIA 33.96 ft. Water

Pumped Fluid: WATER Vapor Pressure of Liquid: 0.75 ft. water Surface Pressure: 0 PSIG (if exposed to air surface pressure = 0)

Piping Configuration:

Pipe

Sub System#: 1 2 3 4 5 6Pipe Diam. (Nom): 1 inch 1 inch 1 inch 1 inch 1 inch 1 inch

Pipe Length: 0 feet 0 feet 0 feet 0 feet 0 feet 0 feetFlow Rate: 0 gpm 0 gpm 0 gpm 0 gpm 0 gpm 0 gpm

TotalPipe Pressure Drop: 0.0 ft. Water 0.0 ft. Water 0.0 ft. Water 0.0 ft. Water 0.0 ft. Water 0.0 ft. Water 0.0

0.0 psi 0.0 psi 0.0 psi 0.0 psi 0.0 psi 0.0 psi 0.0Valves (Fully Open) / Fittings

1 2 3 4 5 6

Qt. Total Qt. Total Qt. Total Qt. Total Qt. Total Qt. Total90 Ells 0 20 0 0 20 0 0 20 0 0 20 0 0 20 0 0 20 0

45 Ell 0 16 0 0 16 0 0 16 0 0 16 0 0 16 0 0 16 0Globe Valve 0 340 0 0 340 0 0 340 0 0 340 0 0 340 0 0 340 0Angle Valve 0 150 0 0 150 0 0 150 0 0 150 0 0 150 0 0 150 0

Ball Valve 0 8 0 0 8 0 0 8 0 0 8 0 0 8 0 0 8 0BF-Valve 0 29.9 0 0 29.9 0 0 29.9 0 0 29.9 0 0 29.9 0 0 29.9 0Ck-Valve 0 55 0 0 55 0 0 55 0 0 55 0 0 55 0 0 55 0

Stand. Tee - flow through run 0 20 0 0 20 0 0 20 0 0 20 0 0 20 0 0 20 0Stand. Tee - flow through branch 0 60 0 0 60 0 0 60 0 0 60 0 0 60 0 0 60 0

- 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 TotalEq. Length Total: 0 0 0 0 0 0 0

Fitting Pressure Drop: 0.0 ft. water 0.0 ft. water 0.0 ft. water 0.0 ft. water 0.0 ft. water 0.0 ft. water 0.00.0 psi 0.0 psi 0.0 psi 0.0 psi 0.0 psi 0.0 psi 0.0

DescriptionAdditonal Pressure Drops: input here 0.0 ft. water

input here 0.0 ft. waterinput here 0.0 ft. waterinput here 0.0 ft. waterinput here 0.0 ft. water

Total: 0.0 ft. water Total Head Loss (Pipe + Fittings + Additional Drops) : 0.0

Results

(Static Head) (Vapor Pressure) (Loss in Fittings) NPSHA

NPSHA = 34.0 + 0.0 + 0.0 - 0.8 - 0.0 - 0.0 - 0.0 = 33.21 ft. Water(Atmospheric Pressure) (Surface Pressure) (Loss in Pipe Length) (Additonal Loss)

Net Positive Suction Head AvailablePump Schedule #: NPSHR 0 ft. Water

MFR: Net Positive Suction Head RequiredModel #: (From Pump Curve)

Safety Factor Enter NPSHR

Eq. Length

Eq. Length

Eq. Length

Eq. Length

Eq. Length

Eq. Length

Nom. Diam.Inchs

1/81/43/81/23/4

11 1/41 1/2

22 1/2

33 1/2

45

68

1012

1416

1820

24

PDF Table of Schedule 40 & 80 Pipe Geometry

Adobe Acrobat 7.0 Document

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0

Sc

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0

ID IDInches Inches

0.269 0.2150.364 0.3020.493 0.4230.622 0.5460.824 0.7421.049 0.957

1.38 1.2781.61 1.5

2.067 1.9392.469 2.3233.068 2.93.548 3.3644.026 3.8265.047 4.8136.065 5.7617.981 7.62510.02 9.564

11.938 11.37613.124 12.5

15 14.31416.874 16.12618.814 17.93822.626 21.564

This Data is for Development Purposes

Note: Trying tofigure out how my fluids results compare to the table values found in the handbook and the pump wheellooks like there is a safety factor associated with the table values when compared to the theoretical values. More testing needs to be done with a wider range of flows and pipe sizes

Rel. Roughtness Pressure Drop in 100 ft. of Pipee = 0.001 My Value Flow Wheel DI GPMRatio 1.0 1.85 2.4 3 100

1.5 1.95 3 90Rel. Roughness 0.92 1.2 3 70e = 0.001 0.68 0.9 3 60Ration 1.3 2.7 2.7 5 400

1.6 1.6 5 3002.4 2.3 6 7001.2 1.3 8 9001.5 1.6 8 1000

1 1.2 1.4 1.6 1.8 2 2.2 2.4 2.6 2.8

0

0.5

1

1.5

2

2.5

3

f(x) = 1.00155440414508 x

My Value

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Note: Trying tofigure out how my fluids results compare to the table values found in the handbook and the pump wheellooks like there is a safety factor associated with the table values when compared to the theoretical values. More testing needs to be done with a wider range of flows and pipe sizes

0.6 0.8 1 1.2 1.4 1.6 1.8 2

0

0.5

1

1.5

2

2.5

3

f(x) = 1.300760603326 x

My Value

AS

HR

AE

Va

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ASI-NPSH Calculator VS HVAC PUMP Handbook

HVAC PUMP Handbook - Author: James B. Rishel

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