Grundfos BM 18-4N Booster Module - 4 Stages (P/N 93078118)

The Grundfos BM 18-4N (product number 93078118) is a horizontal, sleeve-enclosed high-pressure booster module from the BM 18 range, built with 4 stages in the N variant — stainless steel sleeve and shaft. The pump element runs inside a pressure sleeve, so system pressure is contained by the sleeve rather than the pump housing — which is what lets a compact module work at reverse-osmosis pressures.

Specifications published by Grundfos for this exact product number.

Official Grundfos curve for this product number — 60 Hz, water at 68 °F.

Dimensional drawing for the BM 18 frame. Confirm critical dimensions against the certified drawing for your order.

Seawater and brackish-water reverse osmosis • membrane feed and interstage boosting • energy-recovery circuits • industrial process water at elevated pressure.