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We have three boiler feed pump out of which one is stand by. When we decrease load on turbine feed water pressure drop suddenly and it remain for about 3 to 4 minute. we tried by starting stand by pump but it didn't works. All three pumps have common suction and common discharge. We have inspect suction filter of pump but it was ok. and while this going so motor current drop to no load current. please tell me why this is happening. this problem is for us first time in 8 years. I thought it may due to cavitation but from this much of years why it didn't happen.