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NPSH
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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
[email protected] 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
Va
po
r P
res
.(ft
. W
ate
r)
liquid level
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 4:09 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
Sc
he
du
le 4
0
Sc
he
du
le 8
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
AS
HR
AE
Val
ue
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
lue
ASI-NPSH Calculator VS HVAC PUMP Handbook
HVAC PUMP Handbook - Author: James B. Rishel
Flo
w R
ate
(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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