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Selection of Hose Diameter Determination of Pressure Drop in the Line Q W q Velocity: v = .409 = .0509 = 2 2 2 d pd .785d dvp W qp Reynold's Number: Re = 124 � = 6.31 d� = 378 d� Pressure Drop, Isothermal, Incompressible Flow (Liquids): 2 2 2 fL p v fLW fL q P = .001 294 = .000 00336 = .0121 5 d pd d5 Pressure Drop, Isothermal, Compressible, Long Lines (Gases and Vapors): v 2 P = 1 � 1 � fLp 1 1 P1 12 g d P 1 Symbols and Units for Listed Formulas d = inside diameter of hose, inches f = friction coefficient, dimensionless 2 g = gravitational constant, 32.2 ft./sec. P1 = input pressure, PSI P = pressure difference, PSI q = rate of flow at flowing condition, cu. ft./min. Q = rate of flow, gals./min. Re = Reynolds number, dimensionless v = flow velocity, ft./sec. W = rate of flow, lbs./hr. p = weight density of fluid, lbs./cu. ft. CoiledHose,Air&HydraulicPTFE&Technical (Fleet)TruckTooling&FittingsPneumaticHose&ThermoplasticDesignApprovals&AlphanumericHose � = absolute (dynamic) viscosity, centipoises ProductsEquipmentAccessories&Fit.&HoseFittingsTubingInformationGuidesIndexAccessories 273 Parker Hannifin Corporation Parflex Division Ravenna, Ohio
Goodyear Rubber Products
