Efficiency of high pressure boiler feed pump

It is quite difficult task for me to find out the efficiency of a motor driven high pressure boiler feed waster pump. It might not be relevant for this forum. but if anybody of this forum, engage in Power Plant operations & maintenance, have any idea please inform me how to calculate the efficiency of High pressure boiler feed pump with several discharges like IP discharge, HP discharge, Min flow & leak off flow? There are flow meters at HP disch & IP disch only.
 
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