| Popis: |
This case is a vibration issue on a Recycle Gas Compressor. The Machinery Diagnostics Engineer was requested on site to collect only steady state data using a multichannel data collector. When Unit was running at full load condition, vibration at Compressor suddenly increased and exceeded Alert setpoint. Operation at this condition is unsafe and can result in serious unit damage. This case study is designed to outline how the high vibration issue was successfully diagnosed based on a very limited set of information - only steady state data collection, the root cause for the high vibration found and correction actions were recommended and applied. The source of high vibration was considered as rotor unbalance, appeared due to material build up at the rotor. It was the initial issue, lead the Rubbing symptom in the compressor seals and the rotor thermal bow. A compressor rotor inspection was recommended. Signs of significant rubs were found. The compressor rotor was replaced. Vibration level at Unit Startup was well below OEM setpoints. |
