Question and Calculation Regarding Hydraulic Pump

In a hydraulic system, there are a few components that will make sure that the system will circulate the hydraulic fluid throughout the system. One of the major components of the hydraulic system would be the hydraulic pump which is responsible for forcing the hydraulic fluid to flow in one direction and to supply energy for the fluid to circulate. There are a few equations that you should know during a calculation evolving a hydraulic pump will be given with a some question sample that may aid you to understand how to used the equation.

Question 1: (volumetric flow rate)

Consider a piston that has a RPM of 900 or 15Hz and an area of 0.00196 meter square for each piston. The number of piston present in this pump is 6 and the stroke for each piston would be 0.04m, evaluate the volumetric flow rate (VFR) of the hydraulic pump.

From this equation, we can determine the amount of hydraulic fluid that will be pump from the reservoir to the hydraulic system in every second which will come in handy to calculate the theoretical output of the hydraulic pump which will be shown in the next question.

Question 2: (Theoretical Output)

Based on the answer obtain in the question above, determine the theoretical output of the hydraulic pump.

The reason why the theoretical output is important to know is for the next equation where we can find the Volumetric Efficiency of the hydraulic pump which shows how efficient the pump transfer the hydraulic fluid base on the predicted transfer per pump.

Question 3: (Volumetric Efficiency)

Given that the theoretical output of a certain hydraulic pump is 0.08 cubic meter for every pump cycle, but the actual output is 0.06 cubic meter, calculate the volumetric efficiency of the hydraulic pump.



Just bear in mind if the efficiency is above that 100 percent, then you have something wrong with your calculation. Of course, the total efficiency of the hydraulic pump is not equal to the volumetric efficiency because the pump involve some mechanical function which will include the mechanical efficiency which will be further explain in the next question.

Question 4: (Overall Efficiency)

Find the overall efficiency of a hydraulic pump which has the volumetric efficiency of 0.75 and a mechanical efficiency of 0.8.

The efficiency does not have any unit because it is cancel out in the equation, a good pump will provide with a high efficiency, these given value are for question and learning purpose and not base on a real hydraulic pump, but the equations and formulas are, so there is no worry in that.