1. Pump (*Please check the item to solve) Click here for technical support on pump calculation.(1). Most positive displacement pumps fall in the range of 80% to 90% efficiency;
(2). For most hydraulic systems, pressure difference between the suction and discharge ends of pump may range from 500 to 5000 PSI;
(3). For systems of less than 500 PSI, horsepower calculations tend to become inaccurate because mechanical friction losses reduce pump efficiency;
(4). It is necessary to have around 5% of the pump maximum rated horsepower to idle the pump when it is unloaded and the oil is circulating at zero PSI. This amount of power is consumed in flow losses plus mechanical friction losses in bearings and pumping elements.