Guides
Pump system guides and calculators
Last reviewed 21 October 2026.
Short pages on the system curve, available NPSH, suction lift, the operating point, tanker offload, prime-assisted dewatering, and affinity laws. The calculators are estimates for engineering review, not a sealed study.
Pump system curve calculator
Calculate a system curve from static head and Darcy-Weisbach friction, overlay a pump curve, and read the operating point.
Open guideNPSH calculator
Estimate available NPSH from atmospheric pressure, suction lift or flooded head, suction friction, and vapour pressure.
Open guideSuction lift pump sizing
Size a self-priming centrifugal pump on suction lift from static lift, suction-line losses, priming, and NPSH.
Open guidePump curve vs system curve
The operating point is where the pump curve crosses the system curve, and a throttle or a speed change moves that intersection.
Open guideSuction lift wastewater example
Fictional wastewater sample: 4 in steel at 1350 RPM, 301 gpm at 49.6 ft, with NPSH available 18.58 ft versus 9.97 ft required.
Open guideTanker offload pump sizing
Size a tanker offload of diesel or gasoline on suction-hose friction, static head into the tank, and NPSH at the start and end of the load.
Open guidePrime-assisted dewatering
See how a prime-assisted dewatering pump spends atmospheric head on lift, suction-hose friction, and elevation.
Open guideVariable speed and affinity laws
Compare an affinity-scaled pump curve with the real intersection on the system curve, including when static head removes the operating point.
Open guide