Boiler Feed Pump Calculator

Free boiler feed pump calculator: WHP and BHP from GPM, TDH, SG, efficiency; BHP sensitivity bar chart, hydraulic vs shaft overhead stacked bar, scenario table; guide covers BFP sizing, deaerator context, NPSH, VFD feed pumps—not a stamped design.

Boiler Feed Pump Calculator | GPM, TDH, BHP Charts & Scenarios

Summary: Estimate water horsepower (WHP) and brake horsepower (BHP) for a boiler feed pump (BFP) from GPM, total dynamic head (TDH) in feet, specific gravity (SG), and pump hydraulic efficiency. Uses the common U.S. shortcut WHP = (GPM × TDH × SG) ÷ 3960, then BHP = WHP ÷ η. Charts show BHP sensitivity to flow/head nudges and a hydraulic vs coupling power split bar for your base case.

Engineering reality check (tap to expand)
  • Not modeled: NPSHa vs NPSHr, minimum flow / recirc, viscosity, deaerator transient, multi-pump runout, VFD curve shape, or vendor test block tolerances.
  • Does: quick hydraulic kW-ish feel for meetings and training—then you pull the approved water balance, control valve authority, and pump curve from the OEM.

Educational estimator only—not a stamped design basis.

Boiler feed pump calculator (GPM, TDH → WHP & BHP)

Whether you are sanity-checking a heat balance line item, comparing a constant-speed BFP story to a VFD retrofit narrative, or translating a consultant’s “we need about X hydraulic kW” into horsepower at the coupling, the denominator is honest physics and the numerator is whatever TDH you believe today.

Hydraulic inputs

Near-1.0 feedwater is typical; change only if your properties sheet says otherwise.

WHP, BHP, approximate kW, charts, and scenario rows will appear here.

For TDH stack-up, deaerator pegging, and why the boiler feed pump always stars in outage stories, read BFP hydraulics without the vendor fog below.