Pump Wire-to-Water Efficiency
Water HP, brake HP estimate, and wire-to-water % with good/ok/degraded category.
Example
You enter
- Flow (GPM) 500
- Total dynamic head (ft) 120
- Motor input (kW) 25
- Motor efficiency (0-1) 0.92
- Drive efficiency (0-1) 1
You get
- Water HP 15.15
- Brake HP estimate 30.84
- Wire to water (%) 45.19
- Category degraded
Details, formula, and sources
Water HP WHP = (GPM × TDH) / 3960. Brake HP estimate BHP = motor_kW × 1.341 × motor_eff × drive_eff. Wire-to-water % = WHP / motor_HP × 100. Categories: ≥ 65% good, ≥ 50% ok, < 50% degraded.
Hydraulic Institute (HI) standards by name; ANSI/HI 14.6 (Rotodynamic Pumps for Hydraulic Performance Acceptance Tests) by name.
HI standards licensed; principles free in published pump-engineering texts.
Estimate. Operator of record and primacy agency govern.
Field names used by the API: flow_gpm, tdh_ft, motor_kW, motor_eff, drive_eff, whp, bhp, wire_to_water_pct, category
- Constant 3960 (550 ft-lb/sec/HP × 60 sec/min) / (8.34 lb/gal × 1 ft height) ≈ 3960physical-fact derivation