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THE HAZEN-WILLIAMS FRICTION LOSS FORMULA
buildingcoderesourcelibrary.comTHE 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 d = inside diameter of the pipe in inches Note 1: It shoul d be noted that the unit s of P in the H azen- Williams for mula are psi/foot ,