![]() ![]() ![]() The definition of pressure loss as it relates to head loss is This is contrary to Equation 2 and almost all other references. Equation 1 is intended for water, but it says that the pressure drop is independent of fluid density. The reason relates to Equation 1 being in terms of pressure drop but not having a fluid density in the equation. While both Equation 6 (and its variant Equation 7 ) in topic Pressure Drop in Pipes and Equation 1 (in this topic) are used heavily in industry, surprisingly they are not equivalent. This differs slightly from the Hazen Willams version used in AFT Fathom. P = Pressure drop gradient (psi per foot) Some in industry use an alternate form of the Hazen-Williams formula which has this form ( NNFPA 13, Installation of Sprinkler Systems, 1999 Edition, page 13-139. ![]()
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