NPSH Calculator Author: Dimitrii Pokrovskii
[email protected] www.engineering-bear.com
www.azpiping.com
Nov. 16th, 2007, Brought to you by
with permittance from Auth
1 - Start Pump Operating Parameters
System Inlet Heig Open System:
Fluid Temperature (through the pump): Total Pump Volumetric Flow Rate:
(32 - 212 F) (can't change)
Atmospheroc Pressure: Fluid Vapor Pressure:
45 0 14.7 33.957 0.7516
liquid level
33.96
Water Vapor Pres. @ Sea Level 40 ) r e35 t a30 W . 25 t f ( . s20 e r15 P r10 o p a 5 V 0
y = 7.1929E-06x3 - 9.8352E-04x2 + 4.6395E-02x
0
50
100
150
Temperature Deg. F
liquid level
Surface Pr 0
Water Vapor Pressure Reference Table Water Water Temp Temp.. Vapo Vaporr Pres Pressu sure re (Deg. F) (ft. W ater) 80 1 100 2 120 4 140 7 180 18 200 28 212
deg. F gpm PSI ft. Water (ft. Water)
200
250
Each sub system is defined by a fitting that either changes the pipe size or a Tee that combines or separates flow.
r
2 ht 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 bran -
inlet
ssure PSIG inlet -h (Negative) Height
Qt.
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
(Optional)
4 Height:
Static Head 0 ft.
Pipe Type Pipe Size (Nominal) Pipe Length Flow Rate
Fittings 90 Ells 45 Ell Globe Valve Angle Valve Ball Valve BF-Valve Ck-Valve Stand. Tee - flow through ru Stand. Tee - flow through br -
Schedule 40 1 0 0
Qt.
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) 1.049 2.067 3.068 4.026 5.047 6.065 8.071 10.136 12.09 13.125 1.049 1.049 1.049 1.049 1.049 1.049
3 - When You're Done W/ Step 3 - Press the Calculate NP (Optional)
2 inch ft gpm
Total
Pipe Type Pipe Size (Nominal) Pipe Length Flow Rate
Fittings 90 Ells 45 Ell Globe Valve Angle Valve Ball Valve BF-Valve Ck-Valve Stand. Tee - flow throug Stand. Tee - flow throug -
0 0 0 0 0 0 0 0 0 0 0
Schedule 40 1 inch 0 ft 0 gpm
Qt.
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
(Optional)
5 inch ft gpm
Total 0 0 0 0 0 0 0 0 0 0 0
Pipe Type Pipe Size (Nominal) Pipe Length Flow Rate
Fittings 90 Ells 45 Ell Globe Valve Angle Valve Ball Valve BF-Valve Ck-Valve Stand. Tee - flow throug Stand. Tee - flow throug -
Schedule 40 1 inch 0 ft 0 gpm
Qt.
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) 0.864252924 3.355605014 7.392657602 12.73026436 20.00582617 28.89026276 51.16165396 80.69062607 114.8001573 135.2971055 0.864252924 0.864252924 0.864252924 0.864252924 0.864252924 0.864252924
Flow GPM NA NA NA NA NA NA NA NA NA NA
Flow (ft^3/s)
0 0 0 0 0 0
0.001
Velocity (ft/s) 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
Re 0.000 0.000 0.000 0.000 0.000 0.000 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 0 0 0 0 0
e/D 0.00095329 0.00048379 0.00032595 0.00024839 0.00019814 0.00016488 0.0001239 9.8658E-05 8.2713E-05 7.619E-05 0.0009533 0.0009533 0.0009533 0.0009533 0.0009533 0.00095329
Friction Factor NA NA NA NA NA NA NA NA NA 0 0.012915 0.011802 0.012284 0.011514 0.012185 0.011514 Total
H Button (Optional)
3
Pipe Type Pipe Size (Nominal) Pipe Length Flow Rate
Fittings 90 Ells 45 Ell Globe Valve Angle Valve Ball Valve BF-Valve Ck-Valve Stand. Tee - flow thro Stand. Tee - flow thro -
Schedule 40 1 inch 0 ft 0 gpm
Qt.
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
(Optional)
6
Pipe Type Pipe Size (Nominal) Pipe Length Flow Rate
Fittings 90 Ells 45 Ell Globe Valve Angle Valve Ball Valve BF-Valve Ck-Valve Stand. Tee - flow thro Stand. Tee - flow thro -
Schedule 40 1 inch 0 ft 0 gpm
Qt.
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
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 rictional Head Loss:
Sum NA NA NA NA NA NA NA NA NA NA 0 0 0 0 0 0 ft. water 0 PSI 0
245507090.xls.ms_office
Date:
NPSH Calculation
9/25/2014 13:33
Address:
Job Name: Drawings / P age: Max GPM:
Constants / Assumptions: Mean Operating Fluid Temperature:
45 ºF
Pump ed Fluid: WATER
Total Flow Through Pum p:
0 gpm
Vapor Pressure of Liquid:
0.75 ft. water
A t m o s p h e r i c P r e s s u r e:
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
3
1 inch 0 feet 0 gpm
Pipe Pressure Drop: 0.0 ft. Water
0.0 ft. Water 0.0 psi
0.0 psi
4
1 inch 0 feet 0 gpm
5
1 inch 0 feet 0 gpm
0.0 ft. Water 0.0 psi
6
1 inch 0 feet 0 gpm
0.0 ft. Water 0.0 psi
1 inch 0 feet 0 gpm
0.0 ft. Water 0.0 psi
Total 0.0 0.0
0.0 ft. Water 0.0 psi
Valves (Fully Open) / Fittings
90 Ells 45 Ell Globe Valve Angle Valve Ball Valve BF-Valve Ck-Valve Stand. Tee - flow through r un Stand. Tee - flow through branch -
Eq. Length Total: Fitting Pressure Drop:
1 Eq. Qt. Length Total 0 20 0 0 16 0 0 340 0 0 150 0 0 8 0 0 29.9 0 0 55 0 0 20 0 0 60 0 0 0 0 0
2 Eq. Qt. Length 0 20 0 16 0 340 0 150 0 8 0 29.9 0 55 0 20 0 60 0 0
0.0 ft. water 0.0 psi
0.0 ft. water 0.0 psi
Total 0 0 0 0 0 0 0 0 0 0 0
Qt. 0 0 0 0 0 0 0 0 0 0
3 Eq. Length 20 16 340 150 8 29.9 55 20 60 0
Total 0 0 0 0 0 0 0 0 0 0 0
0.0 ft. water 0.0 psi
4 Eq. Qt. Length 0 20 0 16 0 340 0 150 0 8 0 29.9 0 55 0 20 0 60 0 0
Total 0 0 0 0 0 0 0 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 20 16 340 150 8 29.9 55 20 60 0
Total 0 0 0 0 0 0 0 0 0 0 0
0.0 ft. water 0.0 psi
Qt. 0 0 0 0 0 0 0 0 0 0
6 Eq. Length 20 16 340 150 8 29.9 55 20 60 0
Total 0 0 0 0 0 0 0 0 0 0 0
Total 0
0.0 ft. water 0.0 psi
0.0 0.0
Description
Additonal Pressure Drops:
input here input here input here input here input here Total:
0.0 0.0 0.0 0.0 0.0 0.0
ft. ft. ft. ft. ft. ft.
water water water water water water
Total Head Loss (Pipe + Fittings + Additional Drops) :
0.0
Results (Static Head)
NPSHA
= 34.0 + (Atmospheric Pressure)
0.0
+
(Vapor Pressure)
0.0 (Surface Pressure)
0.8
(Loss in Fittings)
-
0.0 (Loss in Pipe Length)
0.0
NPSHA
-
0.0 (Additonal Loss)
=
33.21
ft. Water
0
ft. Water
Net Positive Suction Head Available Pump Schedule #: MFR: Model #:
NPSHR Net Positive Suction Head Required (From Pump Curve)
Safety Factor Enter NPSHR
Air Systems Confidential
9/25/2014
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
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
0 4 e l u d e h c S
0 8 e l u d e h c S
ID ID Inches Inches 0.269 0.215 0.364 0.302 0.493 0.423 0.622 0.546 0.824 0.742 1.049 0.957 1.38 1.278 1.61 1.5 2.067 1.939 2.469 2.323 3.068 2.9 3.548 3.364 4.026 3.826 5.047 4.813 6.065 5.761 7.981 7.625 10.02 9.564 11.938 11.376 13.124 12.5 15 14.314 16.874 16.126 18.814 17.938 22.626 21.564
This Data is for Development Purposes
Note: Trying tofigure out how my fluids results compare to the tabl looks like there is a safety factor associated with the table values 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
3 2.5
e u l a 2 V E A1.5 R H S A 1
0.5
ASHRAE = 1.0016 * (My)
0 0
1
2 My Value
3
values found in the handbook and the pump wheel hen compared to the theoretical values. More testing needs to be done with a wider range of flows and 3
y = 1.3008x
e2.5 u l a 2 V E1.5 A R 1 H S A0.5 0 0
0.5
1 My Value
1.5
2
ASI-NPSH Calculator VS HVAC PUMP Handbook HVAC PUMP Handbook - Author: James B. Rishel
ipe sizes
) M P G ( e t a R w o l F 1000 1500 2000 2250 2500 2750 3000 3250 3500 3750 4000 4250 4500 4750 5000 5250 5000
0 ) 0 r d f o t e 1 a t r f e f a r o o o f t H 0 t W l f a 0 ( k 1 f u s s o r o c o e o o t p ) f l b f a L i r P d s ( d e C a f t n s e i p o a o i s e a H L P A H t f W