Pump sizing calculator - EnggCyclopedia

This is a sample of the pump sizing calculator. To access the working calculator, please sign up for free membership trial.

Consider a system such as shown in the following schematic. This is a basic or most common system where pumps are used for fluid transportation.

This page provides a basic calculation tool for sizing of pumps for a system such as given in the schematic.

For the schematic given above,

FLOW INPUTS
W - Mass Flow rate		kg/hr
ρ - Fluid density		kg/m³
μ - Fluid viscosity		cP
T - Fluid temperature		⁰C
Pv - Vapour pressure at T		bara
Expected pump efficiency		%
Expected motor efficiency		%
SUCTION SIDE INPUTS
Psv op (suction vessel operating Pressure)		barg
Sll min (Minimum suction side liquid level- refer the schematic)		m
ΔPsuct (Pressure loss across the straight suction line)		bar
ΔPs (Pressure loss across the strainer / filter)		bar
ΔPsother (Additional pressure loss on the suction side from fitting etc.)		bar
Psl (Pump suction nozzle level – refer the schematic)		m
DISCHARGE SIDE INPUTS
Pdl (Pump discharge nozzle level – refer the schematic)		m
Pdv op (discharge vessel operating Pressure)		barg
ΔPdisch (Pressure loss across the straight discharge line)		bar
ΔPcv (Pressure loss across the control valve)		bar
ΔPdother (Additional pressure loss on the discharge side from fitting etc.)		bar
dll max (Maximum liquid level required to be attained on the discharge side – refer the schematic)		m

RESULTS
NPSHa (available)		m
Suction pressure		barg
Dischrge pressure (required)		barg
Differential pressure (required)		bar
Shaft Power (required)		kW
Motor Power (required)		kW

This pump sizer tool will output the shaft power and motor power requirement for your given service, flow rate and differential head required across the pump.

Tutorials and references

Tutorial for using the pump sizing calculator
Net positive suction head - NPSH definition
Difference between NPSHr (required) and NPSHa (available)

Here is an NPSH calculation tutorial that makes extensive use of the EnggCyclopedia calculators for quick calculations.
Pipe pressure drop calculation tutorial

Tutorials and references

Login