Required Pump Horsepower

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