CASE STUDY RELIABILITY IMPROVEMENT PROTECT MULTI-STAGE FABRICATED CENTRIFUGAL BLOWERS

摘要

Multistage fabricated centrifugal blowers are used by many companies for relatively low cost air and gas service. A popular model has impellers mounted on a shaft supported at both ends by ball bearings and direct coupled to a motor. This article discusses the in-depth analysis of six blowers and efforts to reduce maintenance costs and improve reliability. Vibration analysis, transient vibration data captured during startup and coastdown, operating deflection shape analysis, experimental modal analysis, rotor dynamic models, continuous laser alignment measurements, witnessed shop disassembly, balancing and reassembly were used to provide an understanding of the dynamics of the blowers, pipe strain effects on alignment and help identity improvement opportunities to increase reliability.