Quality Waterjet Newsletter 07/17/2007

Determination of Intensifier Pump Efficiency


In a 1999 paper*, Herbig and Trieb described an attempt to calculate the efficiency rate of an intensifier pump. They also compared the calculations with experimental results.


The efficiency rate of the pump was calculated based on these three main components: the electrical motor, the hydraulic system, and the double acting intensifier. The efficiency rate of the electrical motor was estimated to be 0.9, referring to another publication. The efficiency rate of the hydraulic system was calculated based on two factors: volumetric and hydraulic-mechanical efficiency rates. The volumetric efficiency rate reflects efficiency loss from leakages. The total efficiency rate of the hydraulic system was calculated by:

    , where Vr - real mass flow rate, Mr & ω - real torque and angular speed).


The efficiency rate of the intensifier was calculated by:

   , where 1 & 2 - the two sides of intensifier)


The calculated efficiency was compared to experimental data as below.


The calculated efficiency is always higher than the experimental data due to over-simplification. The calculation did not consider the losses due to heat and leakage. The rated load, instead of real load, was used in the calculation. The loss in the orifice and compressibility of water were not considered either.


* Herbig, N. & Trieb, F. (1999) Calculation of the efficiency rate of high pressure pumps, in Mohamed Hashish (ed.), Proceedings of the 10th American Waterjet Conference, August 14-17, Houston, Texas, Paper 38.



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