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Sizing an acid pump to a duty

Sizing a pump starts from the duty point — the flow and head the system demands — and the fluid. For acids, the fluid's specific gravity (often 1.2–1.84) raises the absorbed power above the water-equivalent, and the NPSH available at the suction must clear the pump's NPSH-required with margin to avoid cavitation. This tool computes the hydraulic and shaft power, specific speed and NPSH margin, then screens the acid-pump performance-curve database for pumps whose curve actually covers the duty.

How the match works

  • Head at duty — each pump's published curve (head at 100/90/80% impeller trim) is interpolated to your flow; a pump qualifies if its full-trim head meets or exceeds the required head.
  • Impeller trim — the calculator indicates the trim needed to land on the duty without over-pressuring the system.
  • Efficiency, NPSHr & power at your flow come from the pump's NPSH/efficiency data; results are ranked by efficiency and the NPSH margin is checked when an NPSH-available value is entered.

A screening tool — material compatibility for the specific acid, the certified pump curve, NPSH-available and the project specification must be confirmed before procurement.