This is an open system, so elevation in feet that we must lift the water to get into the return main is important. Pump Head Calculation: Elevation H lift and HD min suction If there is any pressure in that sewer pipe, you would have to add that pressure, in feet of head, to the pump head calculations. Those pipes are normally flowing water by gravity and there is no pressure that this pump would have to overcome. Most sump and sewage applications are pumping from a basin up and into a gravity sewer pipe. DO NOT USE THIS ARTICLE FOR GRINDER PUMP SIZING Pump Head Calculation: Residual Head H residual Forced main Grinder Pump applications will require a different calculation and friction loss which are not covered in this blog. Our assumption here is that we are piping into a gravity main. The calculations will be: H total = H lift + H friction + H residual – HD min suction + H safety The suction pressure is simply the minimum fluid level in the sump. We assume there is an open basin where the pump is located. We need the flow rate in gallons per minute (GPM), the elevation or lift required, friction loss, and the pressure of the pipe or system we are discharging into. The information required for the sump and sewage pump head calculations are really no different than any other open system. Required Pump Head Calculation Information Make sure to take a look at this great tool. We also are introducing our new plumbing Sump and Sewage website page. Deppmann Company Monday Morning Minutes will give you both. It is also great when you find a calculator that helps you find and document the answer. Simple or not, it is good to review the information required. Today we want to help you in determining the pump head for sump and sewage applications.
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