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Suction Check & Safe Speed

NPSH available on a suction-lift install — and the maximum pump speed that keeps a margin against cavitation.

No sign-upRuns offline in your browserFormula shown
m
m
Surface below pump centreline.
m
°C
m

Result

Fill in the fields — the result appears as you type.

Method & assumptions
NPSHa = Patm − lift − Hf − Pvap(T) Nmax = 8500 · NPSHa0.75 ÷ √H

Suction-specific-speed limit of 8,500 (conservative process value) rearranged for speed: run slower and cavitation risk falls. This is the check a VFD turns into a live guard — the drive caps speed automatically.

Engineering aid only — verify results against the applicable code edition and the equipment datasheet before committing to a design.

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