The Grundfos BM hp 77-4-R (product number 96293305) is a 4-stage high-pressure booster module built for reverse-osmosis and filtration duty, rated 405 US gpm at 233 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 | 405 US gpm |
| Rated head | 233 ft |
| Stages | 4 |
| Maximum operating pressure | 1199.46 psi |
| Maximum inlet pressure | 1189.31 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 — 1.4539 — 904L |
| Impellers | Stainless steel — EN 1.4539 — AISI 904L |
| Pressure sleeve | Stainless steel — EN 1.4462 — SAF 2205 |
| Motor | 1.4539 |
| Elastomers | NBR |
Motor & Electrical Data
| Voltage | 440-480 V |
| Phase | 3 |
| Frequency | 60 Hz |
| Rated current | 48-46,5 A |
| Enclosure class | IP66 |
Connections & Operating Limits
| Pipe connection | 139 mm |
| Connection standard | PJE |
| Maximum liquid temperature | 104 °F |
Approvals, Weights & Identification
| Grundfos product number | 96293305 |
| EAN | 5700831410171 |
| Net weight | 376 lb |
| Gross (shipping) weight | 557 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.
Need help? Contact ForeverPure Place for pricing, lead time, accessories, or help selecting the correct model for your application.
