CS23: Resolution of Steam Turbine High Vibration Due to Rotor Rub
Abstract
This case study presents a high vibration trip incident experienced on a SP steam turbine which was overhauled, during re-start The machine tripped 3 times on high vibration just before 1st critical The problem was identified quickly through vibration analysis and issue resolved without needing to re-open the turbineThe problem was suspected to be rubbing of the shaft and the labyrinth during acceleration which resulted in a thermal bow of the turbine shaft During detailed troubleshooting, a hold-down bolts on the turbine Drive-end casing was found to be excessively tight This restrained the normal thermal growth of the casing which caused a minor distortion as more steam was being introduced into the turbine The distortion resulted in a rub which thermally bowed the shaft and resulted in the high 1X vibrationThis case study will present the problem encountered, vibration analysis done and the resolution implemented
Description
Case StudiesCollections
Citation
Sing, Ng Wei (2021). CS23: Resolution of Steam Turbine High Vibration Due to Rotor Rub. Turbomachinery Laboratory, Texas A&M Engineering Experiment Station. Available electronically from https : / /hdl .handle .net /1969 .1 /197446.