PIPE FRICTION LOSS CALCULATOR Enter the flow rate, internal pipe diameter and the type of pipe from the list supplied to calculate the total friction loss in a pipeline. Leave pipe length as 100 to get the friction loss per 100 m/ft of pipeline. Flow Rate Diameter Pipe Length Pipe Material Friction Loss m^3/hr l/min l/sec US gpm UK gpm mm in. m ft HDPE LDPE uPVC Rubber Lined New Steel Medium Steel Corroded Steel m ft