Boiler Feedwater Pump Hydraulic Power & TDH Calculator
Calculate boiler feedwater pump (BFP) total dynamic head, hydraulic liquid power, shaft brake horsepower, and electric motor sizing margins.
Boiler Pressure & Friction Losses
Suction State, Flow & Elevation
Pump Head & Driver Sizing
Recommended Tools & Equipment
Tested hardware and components for high reliability
Frequently Asked Questions
Why must boiler feed pumps be sized with substantial head and power margins?
The BFP must overcome boiler drum pressure under safety valve pop conditions, plus worst-case economizer and control valve drops, and still supply maximum continuous rated steam flow (MCR) plus boiler blowdown (~2-5%). If the pump lacks sufficient head, the boiler will suffer drum low-water trip.
Why does water density matter so much in BFP calculations?
At high temperatures (e.g. 138°C / 280°F leaving the deaerator), boiler feedwater density drops from 1000 kg/m³ to ~927 kg/m³. Because centrifugal pumps generate head in fluid column height (meters), a lower density requires higher head to produce the same bar pressure, directly raising required kilowatt driver power.
What is the difference between BB3 and BB5 pump casing designs for BFP?
For operating pressures up to 100-120 bar and temperatures under 200°C, horizontally split multi-stage pumps (API 610 Type BB3) are standard and easy to maintain. For supercritical boilers or pressures above 120 bar, double-casing barrel pumps (API 610 Type BB5) are mandatory to withstand extreme pressure containment and thermal transient shocks without flange leaks.