The Grundfos BM 3A-18 (product number 10783618) is a 18-stage high-pressure booster module built for reverse-osmosis and filtration duty, rated 17.6 US gpm at 328.1 ft. The pump element runs inside a pressure sleeve, so the full system pressure is contained by the sleeve rather than the pump housing.
Performance & Hydraulic Data
| Rated flow | 17.6 US gpm |
| Rated head | 328.1 ft |
| Stages | 18 |
| Maximum operating pressure | 1199.46 psi |
| Maximum inlet pressure | 725.19 psi |
| Maximum outlet pressure | 1189.31 psi |
| Curve tolerance | ISO9906:2012 3B |
Performance Curve
Official Grundfos curve — 60 Hz, water at 68 °F.
Materials of Construction
| Pump | Stainless steel — 1.4301 — 304 |
| Impellers | Stainless steel — EN 1.4301 — AISI 304 |
| Pressure sleeve | Stainless steel — EN 1.4301 — AISI 304 |
| Elastomers | NBR |
Motor & Electrical Data
| Phase | 3 |
| Frequency | 60 Hz |
| Enclosure class | IP66 |
| Grundfos motor number | 7C193706 |
Connections & Operating Limits
| Pipe connection | 42 mm |
| Connection standard | PJE |
| Maximum liquid temperature | 104 °F |
| Booster type | BM3A |
Approvals, Weights & Identification
| Grundfos product number | 10783618 |
| EAN | 5711492336281 |
| Net weight | 79.4 lb |
| Gross (shipping) weight | 148 lb |
| Country of origin | Denmark |
| HS / customs tariff code | 8413.70.2004 |
Typical Applications
Seawater and brackish-water reverse osmosis • membrane filtration • high-pressure boosting • energy-recovery circuits • industrial process water.
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