npsh calculator for process engin

NPSH CalculatorAuthor: Dimitrii Pokrovskii

Nov. 16th, 2007, Brought to you by with permittance from Author1 - Start 2

Pump Operating Parameters System Inlet Height ConfigurationOpen 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 PSI33.96 ft. WaterFluid Vapor Pressure: 0.75 (ft. Water)

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

80 1100 2120 4140 7180 18200 28212 33.96

[email protected] www.engineering-bear.comwww.azpiping.com

75 100 125 150 175 200 2250

5

10

15

20

25

30

35Water Vapor Pres. @ Sea Level

Temperature Deg. F

Vapo

r Pre

s.(ft

. Wat

er)

liquid level

liquid level

with permittance from Author2 3 - When You're Done W/ Step 3 - Press the Calculate NPSH Button

System Inlet Height Configuration System Piping Configuration1 Pipe Type Schedule 40

Pipe 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 40

Pipe Size (Nominal) 1Static Head Pipe Length 0

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

Total Eq. Length

h

-hinlet

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 1.05NA NA 2 2.07NA NA 3 3.07NA NA 4 4.03NA NA 5 5.05NA NA 6 6.07NA NA 8 8.07NA NA 10 10.14NA NA 12 12.09

14 13.131 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 through run 0 20 00 Stand. Tee - flow through branch 0 60 00 - 0 0 00 Total Eq. Length 0


inch 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 through run 0 20 00 Stand. Tee - flow through branch 0 60 00 - 0 0 00 Total Eq. Length 0

Rel. Roughnesse = 0

Flow GPM Flow (ft^3/s) Velocity (ft/s) Re e/D0.86 NA 0 0.000 0 0 NA3.36 NA 0 0.000 0 0 NA7.39 NA 0 0.000 0 0 NA

12.73 NA 0 0.000 0 0 NA20.01 NA 0 0.000 0 0 NA28.89 NA 0 0.000 0 0 NA51.16 NA 0 0.000 0 0 NA80.69 NA 0 0.000 0 0 NA114.8 NA 0 0.000 0 0 NA135.3 NA 0 0 0

0.86 0 0 0.000 0 0.0009533 0.010.86 0 0 0.000 0 0.0009533 0.010.86 0 0 0.000 0 0.0009533 0.010.86 0 0 0.000 0 0.0009533 0.010.86 0 0 0.000 0 0.0009533 0.010.86 0 0 0.000 0 0.00095329 0.01

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 through run 0 20 0Stand. Tee - flow through branch0 60 0- 0 0 0

Total Eq. Length 0


Pipe 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 through run 0 20 0Stand. Tee - flow through branch0 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

13769344.xls

Air Systems Confidential 01/31/2009 Page 9

Date: 1/31/2009 7:28 NPSH CalculationJob Name: Address:

Drawings / Page:Max GPM:

Constants / Assumptions:

Mean Operating Fluid Temperature: 45 F 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) NPSHANPSHA = 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 Available

Pump Schedule #: NPSHR 0 ft. WaterMFR: Net Positive Suction Head Required

Model #: (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

Sche

dule

40

Sche

dule

80

ID IDInches Inches

0.27 0.220.36 0.30.49 0.420.62 0.550.82 0.741.05 0.961.38 1.281.61 1.52.07 1.942.47 2.323.07 2.93.55 3.364.03 3.835.05 4.816.07 5.767.98 7.63

10.02 9.5611.94 11.3813.12 12.5

15 14.3116.87 16.1318.81 17.9422.63 21.56

This Data is for Development Purposes

Note: Trying tofigure out how my fluids results compare to the table values found in the 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 2.81.25

1.5

1.75

2

2.25

2.5

2.75

My Value

ASH

RAE

Valu

e

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 20.75

11.251.5

1.752

2.252.5

My Value

ASHR

AE

Valu

e

ASI-NPSH Calculator VS HVAC PUMP Handbook

HVAC PUMP Handbook - Author: James B. Rishel

Flow

Rat

e (G

PM)

looks 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 10001500200022502500275030003250350037504000425045004750500052505000

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STARTREPORTTABLE DATADEVELOPMENT

npsh calculator for process engin

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