Detection of Misalignment from Vibration Data
Abstract
On a boiler feed pump driven by a motor running close to 3600 rpm, a horizontal misalignment issue was suspected by examining orbit plots besides shaft centerline plots. The follow-up inspection did uncover large parallel misalignment of 0.012 inch along the horizontal direction between the pump and the motor. The root-cause of changes in alignment indicates piping strain as evidenced by loose bolts between the pump and the foundation. The unit was then re-aligned to below 0.001 inch in parallel alignment, followed by correct re-assembly of the coupling. Shaft vibration was successfully reduced to below 2 mil pp and with a normal orbit orientation
Description
Case StudyCollections
Citation
Yu, John; Péton, Nicolas (2020). Detection of Misalignment from Vibration Data. Turbomachinery Laboratory, Texas A&M Engineering Experiment Station; Texas A & M University. Libraries; Texas A & M University. Libraries. Available electronically from https : / /hdl .handle .net /1969 .1 /196838.