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• Straight Pipe <br /> <br />Flow of liquid in HDPE pipe can be represented by the Hazen <br />Williams formula. <br /> <br />Where hf = head loss in feet of water per 100 feet of pipe C = <br />Roughness Coefficient <br />Q = Flow in US Gallons per minute <br />D = Internal Diameter of Pipe in inches <br /> <br />C values are typically about 150 for HDPE pipe, but may fall to 140 <br />if the pipe contains many butt fusion welds; for forced sewage <br />applications, 130 is recommended. <br /> <br />• Select a Pump <br /> <br />• Refer to manufacturer’s data curves for the pump types available <br />to determine which one(s) are required to deliver the flow volume <br />applicable at the pressure required. <br /> <br />