PUMP HP, GPM AND PSI

The amount of power required to drive a pump intensifies as the desired pressure and flow increases.  Also it generally requires a gasoline engine rated at approximately twice the horsepower of an electric motor to get the same performance out of the same pump under continuous operation.

To figure out what horsepower is needed to operate a pump at a certain, desired flow and pressure, you just have to multiply the GPM (gallon per minute) and PSI (pounds per square inch) and figures you want together and divide the result by 1450 to come up with the required electric motor horsepower for pumps. To roughly determine the required gasoline engine horsepower, just multiply the figure by two.