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Pump Duty
Calculate pump duty point from flow and total head built from static lift, friction and minor losses, plus input power.
The Ensign ToolboxPump DutyCalculate pump duty point from flow and total head built from static lift, friction and minor losses, plus input power.
Flow
Head Build-up
m
Vertical lift suction → discharge
Valves, fittings, etc.
%
Typical 5–15 % on total head
Fluid & Efficiency
kg/m³
800–1200 covers glycol/brine
m/s²
%
Typical: VSD circulator 65–75%, end-suction 70–80%
NPSH Suction Check (optional)
kPa
Sea level ≈ 101.325; reduce ~1 kPa/100 m altitude
For hot fluids also lower ρ above to match temperature
m
Positive if liquid above pump; negative if lift
m
m
From pump curve; 0 disables check
Enter flow and head to calculate duty