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NPSH Calculator

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NPSH Calculator

Author: Dimitrii Pokrovskii dimitrii@engineering-bear.com www.engineering-bear.com

Nov. 16th, 2007, Brought to you by

www.azpiping.com

with permittance from Author

1 - Start
Pump Operating Parameters
Fluid Temperature (through the pump): Total Pump Volumetric Flow Rate: Atmospheroc Pressure: Fluid Vapor Pressure: (32 - 212 F) (can't change) 45 0 14.7 33.957 0.7516 deg. F gpm PSI ft. Water (ft. Water) Open System:

2
System Inlet Height Configuration

liquid level (Positive) Height h

inlet Surface Pressure 0 PSIG inlet liquid level -h (Negative) Height

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

Water Vapor Pres. @ Sea Level


40

Height:

Static Head 0 ft.

Vapor Pres.(ft. Water)

35 30 25 20 15 10 5 0 0

y = 7.1929E-06x3 - 9.8352E-04x2 + 4.6395E-02x

50

100

150

200

250

Temperature Deg. F

Design Calcula

Ref.

1 4 2 5 3 6

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

3 - When You're Done W/ Step 3 - Press the Calcula


System Piping Configuration 1 Pipe Type
Pipe Size (Nominal) Pipe Length Flow Rate Schedule 40 1 inch 0 ft 0 gpm

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

Schedule 40 1 0 0

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 -

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

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

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

Schedule 40 1 inch 0 ft 0 gpm

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

Schedule 40 1 0 0

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 -

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

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

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

Rel. Roughness e= Total Fitting Eq. L NA NA NA NA NA NA NA NA NA 0 0 0 0 0 0 0.001

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

Nominal Diam. 1 2 3 4 5 6 8 10 12 14 1 1 1 1 1 1

Pipe ID Area ID (inch) (inch^2) 1.049 0.864252924 2.067 3.355605014 3.068 7.392657602 4.026 12.73026436 5.047 20.00582617 6.065 28.89026276 8.071 51.16165396 10.136 80.69062607 12.09 114.8001573 13.125 135.2971055 1.049 0.864252924 1.049 0.864252924 1.049 0.864252924 1.049 0.864252924 1.049 0.864252924 1.049 0.864252924

Flow GPM NA NA NA NA NA NA NA NA NA NA 0 0 0 0 0 0

Flow (ft^3/s) 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

3
inch ft gpm

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

Schedule 40 1 inch 0 ft 0 gpm

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

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 throug 0 20 Stand. Tee - flow throug 0 60 0 0 Total Eq. Length

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

6
inch ft gpm

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

Schedule 40 1 inch 0 ft 0 gpm

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

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 throug 0 20 Stand. Tee - flow throug 0 60 0 0 Total Eq. Length

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

Safety Factor Piping Fittings

1.3 1.3 HEAD LOSS

Friction Factor NA NA NA NA NA NA NA NA NA

HEAD Head Fittings Pipe NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA 0 NA NA 0.012915 0 0 0.011802 0 0 0.012284 0 0 0.011514 0 0 0.012185 0 0 0.011514 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

80367315.xls

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

1/5/2012 23:17

NPSH Calculation
Address:

Constants / Assumptions:
Mean Operating Fluid Temperature: 45 F Total Flow Through Pump: Vapor Pressure of Liquid: 0 gpm 0.75 ft. water Atmospheric Pressure: Surface Pressure: 14.70 PSIA 0 PSIG 33.96 ft. Water (if exposed to air surface pressure = 0)

Pumped Fluid: WATER

Piping Configuration:
Pipe Sub System#: Pipe Diam. (Nom): Pipe Length: Flow Rate: Pipe Pressure Drop: Valves (Fully Open) / Fittings 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 2 Eq. Length 20 16 340 150 8 29.9 55 20 60 0 3 Eq. Length 20 16 340 150 8 29.9 55 20 60 0 4 Eq. Length 20 16 340 150 8 29.9 55 20 60 0 5 Eq. Length 20 16 340 150 8 29.9 55 20 60 0 6 Eq. Length 20 16 340 150 8 29.9 55 20 60 0 1 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 0.0 0.0 2 1 inch 0 feet 0 gpm ft. Water psi 0.0 0.0 3 1 inch 0 feet 0 gpm ft. Water psi 0.0 0.0 4 1 inch 0 feet 0 gpm ft. Water psi 0.0 0.0 5 1 inch 0 feet 0 gpm ft. Water psi Total 0.0 0.0 6

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: Fitting Pressure Drop:

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

Qt. 0 0 0 0 0 0 0 0 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

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

Qt. 0 0 0 0 0 0 0 0 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

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

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

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

Total 0 0.0 0.0

0.0 ft. water 0.0 psi

0.0 ft. water 0.0 psi Description input here input here input here input here input here Total:

0.0 0.0

ft. water psi

0.0 0.0

ft. water psi

0.0 0.0

ft. water psi

0.0 0.0

ft. water psi

Additonal Pressure Drops:

0.0 0.0 0.0 0.0 0.0 0.0

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

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

0.0

Results
(Static Head) (Vapor Pressure) 0.8 (Loss in Fittings) 0.0 (Loss in Pipe Length) NPSHA

NPSHA
Net Positive Suction Head Available

= 34.0 + (Atmospheric Pressure)

0.0

0.0 (Surface Pressure)

0.0

0.0 (Additonal Loss)

33.21

ft. Water

Pump Schedule #: MFR: Model #:

NPSHR Net Positive Suction Head Required (From Pump Curve)

ft. Water

Safety Factor Enter NPSHR

Air Systems Confidential

1/5/2012

Page 1

PDF Table of Schedule 40 & 80 Pipe Geometry

Schedule 40

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

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

Schedule 80

This Data is for Development Purposes

Rel. Roughness e = 0.001 Ration 1.3

3 2.5
ASHRAE Value

2 1.5 1 0.5 0 0

ASHRAE = 1.0016 * (My)


1
My Value

ASHRAE Value

Rel. Roughtness e = 0.001 Ratio 1.0

Note: Trying tofigure out how my fluids results compare to the table values found in the handbook and the pump wheel looks like there is a safety factor associated with the table values when compared to the theoretical values. More testing ne Pressure Drop in 100 ft. of Pipe 3 My Value Flow Wheel DI GPM 2.5 1.85 2.4 3 100 2 1.5 1.95 3 90 1.5 0.92 1.2 3 70 1 0.68 0.9 3 60 2.7 2.7 5 400 0.5 1.6 1.6 5 300 0 2.4 2.3 6 700 0 0.5 1 1 My Value 1.2 1.3 8 900 1.5 1.6 8 1000

y = 1.3008x

ASI-NPSH Calculator VS HVAC PUMP Handbook HVAC PUMP Handbook - Author: James B. Rishel

1.5

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

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

Flow Rate (GPM)

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