AutoEngCalc - Engineering Calculators

Pump Sizing Calculator

Centrifugal and positive displacement pump selection and performance analysis. Calculate hydraulic power, NPSH, and affinity laws.

Pump Sizing: Q=100 m³/h, H=30 m
P = 10.9 kW

Pump Sizing Calculator

Centrifugal and positive displacement pump selection and performance analysis

Basic Parameters

Calculate hydraulic power, shaft power, and motor power requirements

m³/h
m
kg/m³
cP
%
%
%

NPSH Analysis

Calculate Net Positive Suction Head available and required to prevent cavitation

kPa
kPa
m
m
m
kg/m³

Affinity Laws

Calculate pump performance at different speeds or impeller diameters

m³/h
m
RPM
RPM
mm
mm
kW

Calculation Results

Hydraulic Power

-

kW

Shaft Power

-

kW

Motor Power

-

kW

Motor Power (with SF)

-

kW

NPSH Available

-

m

NPSH Required

-

m

NPSH Margin

-

m

Status

-

-

New Flow Rate

-

m³/h

New Head

-

m

New Power

-

kW

Change Factor

-

-

Impeller Inlet Outlet
Pump Diagram

Pump Sizing Reference

Hydraulic Power Calculation

Hydraulic power (Ph) is calculated as:

Ph = (ρ × g × Q × H) / (3.6 × 106)

Shaft power (Ps) is calculated as:

Ps = Ph / ηpump

Where:
ρ = fluid density (kg/m³)
g = gravitational acceleration (9.81 m/s²)
Q = flow rate (m³/h)
H = total head (m)
ηpump = pump efficiency (decimal)

NPSH Calculation

Net Positive Suction Head Available (NPSHA):

NPSHA = (Ps - Pv)/(ρ × g) + hs - hf

Where:
Ps = suction pressure (Pa)
Pv = vapor pressure (Pa)
hs = static head (m)
hf = friction losses (m)
ρ = fluid density (kg/m³)
g = gravitational acceleration (9.81 m/s²)

Additional Pump Engineering Resources

Pump Selection

Choose the right pump for your application

NPSH Calculation

Net Positive Suction Head analysis

System Curve Analysis

Analyze pump and system interactions

Footer - AutoEngCalc