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Required Pump Horsepower
Back to Conversion Formulas
Brake horsepower is the power out of the drive motor, and the power into the water pump and is how most pumps and drive motors are specified. Also calculate the total power requirements (energy use rate). The pump efficiency depends on the pump and the pressure and flow that the pump is operated at and is found on the pump chart from the manufacturer. Drive motor efficiency affects the total power requirements or energy use rate. Motors are usually specified by their power output, not input, so don't use this number to specify the drive motor necessary to drive the pump. For pumps in wells the depth to the free water surface in the well while pumping needs to be added to the pressure required at the surface.
Estimate the brake horsepower required. (Based on water properties)
Velocity
Pressure:
psi
kPa
feet of water
m of water
bar
Flow Rate:
gpm
cfs
acre-in/day
acre-in/hour
acre-ft/day
lps
lpm
cms
cu. m/hr
Pump Efficiency:
%
Drive Motor Efficiency:
%
Brake Horsepower:
HP
KW
Total Power Input Requirements (Energy Use Rate):
HP
KW
Other Pump Conversion Formulas
Pressure Conversions
Flow Conversions
Temperature Convertions
Vacuum Conversions
Speed Change (Affinity Laws)
Weight Converter
Length Converter
Viscosity Conversion
Volume Conversion and Calculations of Cylinders, Squares, and Rectangles
Pipe Velocity & Minimum Pipe Diameter
Required Pump Horsepower
Net Positive Suction Head Available (NPSHA)
Total Dynamic Head
Horsepower Conversion
Density to Specific Gravity