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In piping design, we convert pressure drops into (meters or feet of fluid column). 1.3 Darcy-Weisbach Equation (The Core of Sizing) The primary equation for frictional pressure drop is:

[ h_f = f \cdot \fracLD \cdot \fracv^22g ]

[ D_opt = 0.363 \cdot Q^0.45 \cdot \rho^0.13 ]