It is the losses due to the friction against the internal wall of the pipe. Pressure loss from the linear length of pipe can be represented by the Hazen-Williams Equation, which is explained in more detail in the tab “Linear Length Pipe Loss Calculator”. Hazen-Williams Pressure Loss Equation - The Hazen-Williams equation can be used to calculate the pressure drop (psi) or friction loss in pipes or tubes. Overall System Pressure Loss (feet) = Pipe Loss (A) + Fitting Loss (B) + Static Loss (C) The overall system pressure loss arise from losses through the linear length of pipe, losses through fittings or accessories, and losses to overcome gravity (static loss). The pump’s pressure head should be designed to overcome these pressure losses. Nonetheless, a quick estimation of the overall system’s pressure loss can also provide an idea where the range should be. A pump’s pressure head can be estimated with many simulation softwares available in the market.
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