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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.

 

Pressure (psig)   Efficiency (%)  
Flow (gpm)   Power (hp)  
         
2. Pipe (*Please check the item to solve) Click here for technical support on pipe calculation.Pipe size should be selected on the basis of oil flow velocity.
(1). For pump suction lines, the oil velocity inside the pipe should be within the range of 2 to 4 feet per second;
(2). For oil return lines, the oil velocity inside the pipe should be within the range of 10 to 15 feet per second;
(3). For medium pressure lines carrying 500 to 2000 PSI, flow velocity inside the pipe should be kept at 15 to 20 feet per second. Please use extra strong weight pipe or steel tubing;
(4). For high pressure lines carrying 3000 to 5000 PSI, flow velocity inside the pipe may be allowed up to 30 feet per second.
         
Flow (gpm) Inner Dia. (in)
Velocity (ft/sec) Flow area (in^2)
    
3. Cylinder (*Please check the item to solve)
    
Bore dia. (in) Piston area (in^2)
Rod dia.  (in) Rod area (in^2)
Stroke (in) Annular (in^2)

Extend Retract Regen
Volume (in^3)
Pressure (psig)
Force (lb)
Speed (in/sec)
Flow (gpm)
Time (sec)