The Grundfos BM 95-4N (product number 19893604) is a 4-stage high-pressure booster module built for reverse-osmosis and filtration duty, rated 498 US gpm at 236.2 ft, driven by a 35 HP three-phase motor. 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 | 498 US gpm |
| Rated head | 236.2 ft |
| Stages | 4 |
| Maximum operating pressure | 1199.46 psi |
| Maximum inlet pressure | 362.59 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 — 1.4401 — 316 |
| Impellers | Stainless steel — EN 1.4401 — AISI 316 |
| Pressure sleeve | Stainless steel — EN 1.4404 — AISI 316L |
| Motor | Stainless steel — 1.4539 — 904L |
| Elastomers | NBR |
Motor & Electrical Data
| Rated power (P2) | 35 HP |
| Voltage | 440-460-480 V |
| Phase | 3 |
| Frequency | 60 Hz |
| Rated current | 56.5-54.0-53.0 A |
| Starting current | 530-580-630 A |
| Service factor | 1.15 |
| Power factor (cos φ) | 0.88-0.86-0.84 |
| Starting method | direct-on-line |
| Enclosure class | IP66 |
| Grundfos motor number | 78195119 |
Connections & Operating Limits
| Pipe connection | 139 mm |
| Connection standard | PJE |
| Maximum liquid temperature | 104 °F |
| Booster type | BM95 |
Approvals, Weights & Identification
| Grundfos product number | 19893604 |
| EAN | 5700390112066 |
| Net weight | 388 lb |
| Gross (shipping) weight | 568 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.
