Hello all, I wanted to give an update on this. Pump cover was removed and it was found that the second stage impeller wear ring shifted outward. This coincides with recirculation/cavitation sound we heard and explains the loss of head at shut-off and reduced flow when valve was returned to fully...
Thank you all for the responses.
georgeverghese - Yes, there is an air/vac valve on a port located on top of the case. Verified air/vac working properly and pump is fully flooded.
Artisi - Thank you for the advice.
pierreick - Yes we did, confirmed amp reads at 62 amps (FLA = 69 amps). We do...
Rputvin - Sounds very similar to what I am experiencing. Pump rotation was verified prior to testing and our repair shop did not trim the impeller during overhaul. When vibration was measured after performance testing, it increased slightly from baseline reads taken just before performance...
Thank you all for the responses. Provided a little more info.
LittleInch - Sorry, I should have clarified the points a little better. Points labeled "Pump Test" on the graph are data points taken during pump performance testing and the data point at 1500 gpm is with a partially closed valve. We...
Hello All,
I did a pump performance test on a recently overhauled horizontal split-case pump for a potable water system. Under normal operating conditions, pump was operating slightly off curve (tank elevation was high) but was within our internal acceptable range. We typically do a pump...
