Fluid Mechanics & Hydraulics

Pump System & NPSH Analyzer

Examine pump characteristic head curves against total system resistance, check for suction-lift cavitation thresholds, and simulate tank drainage events.

Fluid Type

Water @ 20°C

Density: 1000 kg/m³

Mesh

61 nodes

Continuum sweep

Output

CSV

Export ready

Parameters

System Layout Presets

Pump Shut-off Head (H₀)50 m

10200

Pump Max Flow (Q_max)100 m³/h

10500

Suction Static Level-2.00 m

-1010

Static Discharge Lift18 m

0150

Atm Pressure101.30 kPa

70120

Fluid Vapor Pressure2.30 kPa

0.525

Animated supply reservoir draw-down

Hydraulic Calculations

Pump Head

H_pump = H_0 - A * Q^2

System Resistance Head

H_sys = (H_discharge - H_suction) + R_total * Q^2

NPSH Available

NPSHa = (P_atm - P_vapor)/(ρ*g) + H_suction - h_suction_losses

NPSH Required Curve

NPSHr = NPSHr_0 + B * Q^2

Operating Point: Q = 63.2 m³/h intersecting at total head of 30.0 m.

Suction pipeline head loss: 2.00 m.

Safe operation. NPSHa exceeds NPSHr by 2.29 m.

Hydraulic System Layout

Cavitation Risk

SAFE OPERATION

Operating Flow Rate

63.2m³/h

Pump Operating Head

30.0m

NPSH Available (NPSHa)

6.09m

NPSH Required (NPSHr)

3.80m

Atmospheric Head

10.09m

Pump Head and NPSH Curves vs. Flow Rate

System Sweep Table

Flow (m³/h)	Pump Head (m)	System Head (m)	NPSH Available (m)	NPSH Required (m)
0.0	50.00	20.00	8.09	1.00
10.0	49.50	20.25	8.04	1.07
20.0	48.00	21.00	7.89	1.28
30.0	45.50	22.25	7.64	1.63
40.0	42.00	24.00	7.29	2.12
50.0	37.50	26.25	6.84	2.75
60.0	32.00	29.00	6.29	3.52
70.0	25.50	32.25	5.64	4.43
80.0	18.00	36.00	4.89	5.48
90.0	9.50	40.25	4.04	6.67