I think we figured out the problem. The casting used on this impeller is from a foreign casting, the previous models used a domestic casting. We're going to do a CMM to verify whether the casting is done right or wrong.
Thanks for all the input!!!!!
The Pump is designed for 4375 GPM, 1780 RPM, 435 ft head, 600 BHP and 75% efficiency. Efficiency is Good, but head is 50 ft low, and BHP is also low. The pump is tested in the lab. We've tested a similar pump before and the results were fine.
We've got a vertical turbine pump 4 stages 3 primary and 1 inducer. The pump is tested and 50 ft low in head....we've checked the wear rings, there's no slip in the impellers, we don't expect it to be hydraulics because efficiency is fine. Impeller diameter is normal.
Any suggestions????
