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THE HAZEN-WILLIAMS FRICTION LOSS FORMULA
buildingcoderesourcelibrary.comBuilding Code Resource Library 1 May 16, 2010 THE HAZEN-WILLIAMS FRICTION LOSS FORMULA P = 4.52Q1.85/C1.85d4.87 Where P= pressure loss in psi/foot length of pipe Q = flow in the pipe in gpm C = roughness coefficient of the pipe