Resonance
BACKGROUND: After starting a Demsy's Program at a Wastewater Treatment Facility. The baseline data showed that one of the vertical pumps was showing signs of RESONANCE.
FINDINGS: A Bump test was conducted and the results showed that the pump definitely had a RESONANCE in the radial direction.
SOLUTION: All base fasteners were tightened, the base was re-grouted and stiffening was added. The before and after spectral data are presented below. The unit is now running at acceptable levels.
CONCLUSION: Catastrophic failure was avoided. The resonance was identified and eliminated during a scheduled downtime.
Trending is the key. Once again the Demsy's Program was justified.
