A centrifugal pump was investigated due to multiple seal failures. Readings indicated high amplitude vibration at 1x running speed. Typically this is an indication of misalignment. However, the motor/pump had been aligned and later confirmed to be within tolerance. Motion Amplification to the rescue!!
After taking multiple videos it was discovered that the center support section of the base was hollow and flexing due to fatigue, temporarily and rapidly throwing the pump runner out of alignment. The software also enabled us to analyze phase, and it was clear the foot was going in and out of phase with the runner itself.
Looseness and fatigue in the pump runner’s support leg was also evident. By simply replacing the support leg and stiffening the base the vibration was drastically reduced.