Field case · Condition monitoring
Cooling water pump: one of three identical new pumps with 5.3 mm/s RMS and 1X shocks, an open diagnostic
Quick answer
Three new cooling water pumps were installed, and only one vibrated: 5.3 mm/s RMS, mostly horizontal, a strong 1X line, and acceleration of 5.23 g peak-to-peak with shocks at 1X. Alignment and soft foot were within tolerance and cross-coupling phase was linear. The source does not give a resolution.
What the case covers
- The situation
- What was checked and found
- Why it is puzzling
- What the facts rule out and what stays open
- What to take from it
Takeaway. Unbalance gives a sine wave. Shocks at 1X mean something is touching once per turn. Compare the odd machine with its identical twins.
Read the full case, with the data and the numbers