Engineering-Stream - Software for Engineering Applications

Pump NPSH Calculator - Reciprocating Pumps (SI Units)

Volumetric flow rate, Q    m3/s
Speed of revolution, n    rpm
Type of pump, PT
Acceleration head factor, C
Type of fluid, FT
Fluid compressibility factor, k

Calculate Accelerating head - Suction Line1

Pipe Nominal Size and Schedule
Selected Pipe Outside Diameter, Do1    mm
Selected Pipe Nominal Wall Thickness, Tn1    mm
Selected Pipe Inside Diameter, Di1    mm
Liquid mean velocity, V1    m/s
Length of suction pipe, L1    m
Acceleration head, ha1    m

Calculate Accelerating head - Suction Line2

Pipe Nominal Size and Schedule
Selected Pipe Outside Diameter, Do2    mm
Selected Pipe Nominal Wall Thickness, Tn2    mm
Selected Pipe Inside Diameter, Di2    mm
Liquid mean velocity, V2    m/s
Length of suction pipe, L2    m
Acceleration head, ha2    m

Calculate Total Accelerating head

Total Acceleration head, hat m

Enter Additional Data

Density of the liquid, rho    kg/m3
Pressure at the location in the suction line / vessel, Psv    kPa
Vapor Pressure of the liquid, Pvp    kPa
Net head due to pressure in the suction line / vessel, Hsv    m
Available Liquid level at the location in the suction line / vessel, Zsv    m
Friction Loss in suction line1, Pd1    kPa
Friction Loss in suction line1, hf1    m
Friction Loss in suction line2, Pd2    kPa
Friction Loss in suction line1, hf2    m
Total friction Loss in suction line, hft    m

Results

Net Positive Suction Pressure Available, NPSHA    m
Net Positive Suction Pressure Required (from pump datasheet), NPSHR    m
Margin of NPSHA over NPSHR (20 to 35 kPa recommended), NP_Margin_Low    m

Margin of NPSHA over NPSHR (20 to 35 kPa recommended), NP_Margin_High    m

Margin of NPSHA over NPSHR, NP_Margin    m
Design Verification

Help

General Notes:

Note: Refer to the "Terms and Conditions" in the 'About' section before using the software.

1) Pump NPSH Calculator is a software program that can be used to verify the Net Positive Suction Head (NPSH) requirements of a Centrifugal / Reciprocating pump.

2) The procedure is based on GPSA Engineering Data Book - 14th Edition.

3) Pipe sizes varying from 1/2 NPS (DN 15) nominal diameter to 48 NPS (DN 1200) nominal diameter.
Pipe sizes are taken from ANSI / ASME 36.10M,

4) You may use 'Piping Pressure Drop Calculator', available in this site to find the pressure drop in the piping.

5) The user needs to select / fill in relevant input data. It is assumed that the suction line can consist of a maximum of 2 different pipe diameters. Once the relevant input data is filled / selected, the user needs to hit the 'Submit' button. so the acceleration head, ha value for the reciprocating pump can be calculated by the program. The program calculates the available NPSH for the centrifugal reciprocating pump and then compares this value to the required NPSH value for the pump.

Terminology used for centrifugal / reciprocating pumps:
NPSHA - Net Positive Suction Head Available, m
NPSHR - Net Positive Suction Head Required, m

6) If you notice any error, please let us know, so that can be rectified.

7) Contact us with any comments / questions : engineeringstream11@gmail.com

8) Visit us for more software programs at https://engineering-stream.com