The Grundfos 5S15-31 (product number 81530315) is a SP1A stainless steel submersible well pump rated 4.4 US gpm at 541.4 ft across 31 stages, supplied complete with a three phase Grundfos MS402 submersible motor.
Performance Curve
Official Grundfos curve — 60 Hz, water at 68 °F. Head (H) and efficiency (η) against flow (Q); lower chart shows power and NPSH required.
Performance & Hydraulic Data
| Rated flow | 4.4 US gpm |
| Rated head | 541.4 ft |
| Stages | 31 |
| Pump speed (data basis) | 3450 rpm |
| Pump type | SP1A |
| US designation | SP1A-31 |
| Maximum operating pressure | 217.56 psi |
| Maximum outlet pressure | 362.59 psi |
| Built-in return valve | Yes |
| Curve tolerance | ISO9906:2012 3B |
Materials of Construction
| Pump housing | Stainless steel — EN 1.4301 — AISI 304 |
| Impellers | Stainless steel — EN 1.4301 — AISI 304 |
| Motor material | Stainless steel — 1.4301 — 304 |
Installation & Connections
| Discharge connection | 1 NPT(F) |
| Motor diameter | 4 inch |
| Minimum borehole diameter | 4.13 in |
| Overall length | 45.5 in |
| Liquid temperature range | 5 °F to 104 °F |
Motor & Electrical Data
| Motor power (P2) | 1.5 HP |
| Voltage & phase | 230 V, three phase |
| Frequency | 60 Hz |
| Rated current | 7.3 A |
| Starting current | 510 A |
| Service factor | 1.30 |
| Insulation class | B |
| Starting method | direct-on-line |
| Enclosure class | IP68 |
| Motor cable | 3.94 ft |
| Grundfos motor number | 79302005 |
Approvals, Weights & Identification
| Approvals | CULDWUS,CCSAUS |
| Drinking water | PROP65 |
| Grundfos product number | 81530315 |
| Pump-end number | 08110031 |
| EAN | 5700394509633 |
| Net weight (pump + motor) | 35.5 lb |
| Gross (shipping) weight | 50.1 lb |
| Country of origin | United States |
| HS / customs tariff code | 8413.70.2004 |
Typical Applications
Well and borehole water supply • groundwater abstraction • irrigation • pressure boosting • livestock and rural water • industrial process water.
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