We have three boiler feed pumps operating in parallel and suspect cavitation in the #1 & #3 Pumps. The pumps supply water to a boiler, and 90% of the time two pumps must operate to satisfied the steam demand. The original pumps were installed in 1970, and the #2 pump was replace last year due to failure. Since that time we've experience what we suspect as cavitation, #1 Pump failed from outboard bearing demise and the #3 Pump failed from the 1st stage impeller, #1 of six, being excessivley eroded to the point holes existed. We suspect cavitation has been present for quite some time because operational records indicate similar problems. Do you feel this is a correct assumption? The recirc line was removed years ago, and as of this writting, there is no ability to balance flow by recirculation, which is what we'd like to achieve as we feel this is the resolution to our problem. I am new at this, so please understand when I ask how is this accomplished. I would think installation of a recirc line would be somewhat simple, but have been insuccessful in finding any plans or what instrumention and equipment one should use to correct this type problem. I would appreciate any help one could provide, and will be looking forward to whatever responses I receive. Thank you.
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