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Truck(Fleet)PTFE &Hydraulic&TechnicalThermoplasticAlphanumericTooling&HoseHose,AirCoiledApprovals& ProductsHose& DesignTubingPneumaticAccessoriesEquipmentFittingsIndexGuides Selection of Hose Diameter FittingsHose&Fit.InformationAccessories& Selection of Hose Diameter from Flow Rate and Velocity The Fluid Velocity Nomogram gives the velocity of a liquid or gas as a function of flow rate and inside diameter of the fluid line. The commonly recommended maximum velocities for hydraulic oil systems at 200�F or less are indicated for guidance. Example: At 10 gpm, what is the minimum size within the recommended velocity range for a hydraulic pressure line? The dashed line drawn from the 10 gpm mark on the left hand line to the maximum velocity of 20 fps inter- sects the middle line at .438 " (7/16" I. D. hose or tubing). For a hose application, use 1/2" I. D., the nearest common standard size. This chart is based on the following formulas: v = .321Q , Q = gal per min fps 2 �d d = hose or tube I. D. (inch) 4 cu. ft./min. = .1337 Q The cu. ft. per min. value is the actual volume flow rate under flowing condi- tions. For air, standard cfm of free air = 7.81 actual cfm when the inlet air is at 100 PSIg, 68�F. 272 Parker Hannifin Corporation Parflex Division Ravenna, Ohio
Goodyear Rubber Products
