Calculate flow rate (Q) as follows: In case of driving through gears, pulleys or chains, the T option is recommended. This option allow radial and/or axial loads on the pump shaft. Calculate hydraulic power (P), transferred to fluid froma pump subject to a pressure differential between inlet and delivery as follows: Drive Connect the pump to the motor using a mechanical power transmission coupling so that no radial and/or axial force is transmitted to the pump shaft during rotation, otherwise pump efficiency will dramatically drop due to early wear of inner moving parts. jbj Techniques have a wide range of suitable couplings to suit a wide range of applications and we can advise on which coupling depending on the circumstances of the application. Absorbed power Dp = pressure differential [bar] Calculate the velocity (v) of a fluid in a pipe as follows: V = displacement [cm³/rotation] A= inside area of pipe [cm²] v =Q / 6 •A[m/s] Calculate necessary torque (M) of a pump subject to pressure differential between inlet and delivery as follows: Frequently Used Formulas Q= V • n • 10 -3 / hvol [litre/min] n = rotation speed [rotations per minute] V = displacement [cm³/rotation] Q= flow rate [litre/min] hvol = pump volumetric efficiency (take 0.95 as an indicative value for rotation speeds ranging between 1000 and 2000 rotations per minute) M= (V •Dp) / (62.8 • hhm) [Nm] For further details contact jbj Techniques technical office, email: info@jbj.co.uk or telephone: +44 (0)1737 767493 Fluid velocity Absorbed flow rate Dp = pressure differential [bar] Absorbed torque hhm= hydromechanical efficiency (take 0.80 as indicative value under cold conditions and 0.85 under working conditions). Q= flow rate [litre/min.] P= (Q •Dp) / (600 •htot) [kW] htot = total pump efficiency (hhm •hvol) Contact jbj Techniques technical office, email: info@jbj.co.uk or telephone: +44 (0)1737 767493 for further details on efficiency. The proper values for flow rate, torque and supplied according to pressure differential, rotation speed and set test conditions, can be found on thePerformance Curvepages. These pumps are hydraulic machines converting mechanical power into hydraulic power. This section deals with rotary positive-displacement pumps. In this type of pump, a given volume of fluid flows from inlet to outlet at each shaft rotation (theoretical displacement). Pressure depends on delivery line resistance to Values for hvol andhhm (and consequentlyhtot) depend on pressure differential between supply and delivery, rotation speed, fluid features (temperature and viscosity) and filtering degree. Gear Pumps ALP-GHP Series Installation and Running Information 12 www.jbj.co.uk/gear-pumps.html #DriveLineHarmony
RkJQdWJsaXNoZXIy NzQyNjQ=