We have 2 Pumps runs parallel. Pump Discharge before Turaround 70-72#. Pump Discharge right after Turnaround 65# of last year. We have about 7# differences ever since. First we thought that might be we changed out the impeller, with new metal, it might slow down the flow. But now, we don't know what happened, no change in cooling water process, no one did anything to the valves neither the line services. We are looking at some causes such as: Check Valve Stuck, Impeller Wear/Erosion, Obstruction in Suction Line, Lower Turbine Speed. Does anyone ever encounter similar type of problem?
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