Boiler Feed Pump Calculator
Calculate Total Dynamic Head (TDH), pump flow rate, hydraulic power, shaft power, wire-to-water power, and NPSHa for boiler feed pump sizing and selection.
Boiler Parameters
lb/hr
psig
psig
%
SG
Head Components
ft
ft
psi
psi
psi
psi
Efficiency & Motor
%
%
📊
Results
—
Total Dynamic Head
feet
—
Total Flow Rate
GPM
—
Hydraulic Power
HP
—
Wire-to-Water Power
HP
| Flow Rate Calculations | |
| Base Flow Rate | — |
| Blowdown Flow | — |
| Total Flow Rate | — |
| Head Calculations | |
| Base Head (Duty Point) | — |
| Elevation Head | — |
| Friction & Valve Losses | — |
| Suction Head Credit | — |
| Total Dynamic Head (TDH) | — |
| Shutoff Head (Safety Valve) | — |
| Power Calculations | |
| Hydraulic Power | — |
| Shaft Power (Pump Input) | — |
| Wire-to-Water Power | — |
| Recommended Motor Size | — |
⚠ Safety Valve Warning: The pressure differential between operating pressure and safety valve setting exceeds 20 psig. Consider a safety valve rated closer to boiler operating pressure.
Note: TDH = Base Head + Elevation + Losses - Suction Credit. Base Head = Operating Pressure x 2.31 x 1.03 / SG. Hydraulic Power (HP) = Flow (GPM) x TDH / (3960 x SG). Verify results with pump manufacturer curves.
Calculate the Net Positive Suction Head Available (NPSHa) to ensure the pump does not cavitate. NPSHa must exceed the pump NPSHr by at least 1–2 ft.
psia
psia
ft
ft
ft
NPSHa (Net Positive Suction Head Available)
—
Estimate the yearly energy cost of running your boiler feed pump based on motor power, operating hours, and electricity rate.
HP
hrs
$/kWh
—
Motor Power
kW
—
Annual Energy
kWh/yr
—
Annual Cost
USD/yr