The Grundfos 77S50-8 (product number 98979555) is a stainless steel submersible groundwater pump supplied complete with motor, rated 77 US gpm nominal flow, 8 stages, a 5 HP submersible motor.
Pump & Hydraulic Data
| Model | 77S50-8 |
| Nominal flow | 77 US gpm |
| Stages | 8 |
| Minimum well diameter | 4" minimum |
| Discharge connection | 2" NPT |
| Pump orientation | Vertical, submersible |
Values decoded from the Grundfos type designation. Full head/flow curve and NPSH data for this configuration are available on request.
Motor & Electrical
| Rated power | 5 HP |
| Phase | Three-phase |
| Voltage | 575 V |
| Frequency | 60 Hz |
| Motor type | Grundfos submersible, supplied with pump |
Materials & Construction
| Pump material | AISI 304 stainless steel |
| Construction | Sand-resistant, corrosion-resistant stainless steel |
| Built-in check valve | Yes — standard on SP |
Weights & Identification
| Net weight | 70.8 lb |
| Gross (shipping) weight | 126.2 lb |
| Shipping dimensions (L × W × H) | 74.4 × 11.4 × 14.4 in |
| Grundfos product number | 98979555 |
| EAN | 5712604614358 |
| Material pricing group | WG |
Typical Applications
Groundwater supply from drilled wells • municipal and rural water supply • irrigation and agriculture • pressure boosting • reverse osmosis and membrane filtration feed • industrial process water • mine dewatering.
Need the performance curve, NPSH data, or help matching this pump to your well depth and duty point? Contact ForeverPure Place — we will pull the factory data for this exact configuration and confirm lead time.
