Technical handbook V 400 300 200 150 100 90 80 70 60 50 40 30 20 15 10 9 8 7 6 5 4 4,8 6,3 7,9 9,5 12,7 15,9 19,1 25,4 31,8 38,1 50,8 -3 -4 -5 -6 -8 -10 -12 -16 -20 -24 -32 1,2 1 0,6 2 3 4 5 6,1 7 8 9 30 25 20 15 10 8 7 6 5 4 3 2 3/16 1/4 5/16 3/8 1/2 5/8 3/4 1 1-1/4 1-1/2 2 Flow Q (l/min) Velocity m/s feet/s Recommended maximum velocity for suction lines Recommended maximum velocity for return lines Recommended maximum velocity for pressure lines Inside diameter d mm dash sizes inch The chart below is provided as an aid in the determination of the correct hose size. Example: at 10 gallons per minute (gal/min), what is the proper hose size within the recommended velocity range for pressure lines? Locate 10 gallons per minute in the left-hand column and 20 feet per second in the right-hand column (the maximum recommended velocity range for pressure lines). Lay a straight line across these two points. The inside diameter shown in the centre column is above -6 so we have to use -8 (1/2"). For suction hose, follow the same procedure except use recommended velocity range for intake lines in the right-hand column. where: Q = flow in gallons per minute (gal/min & l/min) V = velocity in feet per second (f/s & m/s) d = hose inside diameter (mm & dash size) * Recommended velocities are according to hydraulic fluids of maximum viscosity 315 S.S.U. at 38°C working at roomtemperature within 18° and 68°C. UK gallons Conversion factor: gal/min x 4,546 = l/min feet/s x 0,3048 = m/s Flow capacity nomogram Flow capacity nomogram Formel D = sqrt{{Q*K} over {V} } = sqrt{{45 l over m * 21,2025} over {6,1 m over D= Q∗K V = 45 l m ∗21,2025 6,1 m s =12,5mm Example Flow Q = 45 l/m Velocity V = 6,1 m/s Konstant K = 21,2025 Technical handbook
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