Fluid Mechanics

NPSHa Pump Simulator

Examine Net Positive Suction Head Available (NPSHa) inside industrial pump circuits. Simulate suction lift heights, friction losses, atmospheric pressures, and fluid vapor limits to safeguard systems from vapor cavity collapse.

Medium

Liquid Water

Dynamic fluid model

Mesh

31 steps

Static lift sweep

Output

CSV

Export ready

Parameters

Liquid Condition Preset

Static Suction Head (Hs)2.00 m

-1020

Atmospheric Head (Hatm)10.30 m

515

Vapor Pressure Head (Hvap)0.24 m

Friction Head Loss (Hf)1.50 m

015

Pump NPSH Required3.00 m

0.510

Animated static head sweep

Governing Equations

NPSH Available

NPSHa = Hatm - Hvap + Hs - Hf

Safety Margin

Margin = NPSHa - NPSHr

Cavitation Limit

Cavitation occurs when NPSHa < NPSHr

Hatm: Atmospheric Pressure Head (10.3 m)

Hvap: Fluid Vapor Pressure Head (0.24 m)

Hs: Static Suction Head (2.0 m)

Hf: Friction Head Loss (1.5 m)

Piping System Diagram

NPSH Available

10.56m

NPSH Required

3.0m

Safety Margin

7.56m

System Status

SAFE

NPSHa & NPSHr vs Static Head

Suction Dataset

Static Head Hs (m)	NPSHa (m)	NPSHr (m)	Status
-10.0	0.00	3.0	Cavitation
-7.0	1.56	3.0	Cavitation
-4.0	4.56	3.0	Safe
-1.0	7.56	3.0	Safe
2.0	10.56	3.0	Safe
5.0	13.56	3.0	Safe
8.0	16.56	3.0	Safe
11.0	19.56	3.0	Safe
14.0	22.56	3.0	Safe
17.0	25.56	3.0	Safe
20.0	28.56	3.0	Safe