Machine data
- Manufacturer: Ariel
- Drive power: 6150 kW (8636 hp)
- Speed: 700 rpm
- 6 cylinder
- Double acting, 2 stages
- Suction pressure: 40 bar
- Discharge pressure 240 bar
Sequence of events:
3:45 AM
PROGNOST®-SILver Protection hardware shut down the monitored compressor. Initiated because of piston rod position of cylinder 1.
5:02 AM
PROGNOST®-SILver tripped the compressor again during start-up. Again due to rod position cylinder 1.
9:45 AM
PROGNOST Customer Support recommends to make no restart, cause of high piston rod movement
Screenshots from Online Condition Monitoring system PROGNOST®-NT
- 2 months 3D-trend of rod position
- 2 months 3D-trend of crosshead slide vibration
Evaluation
- No long term indications on crosshead slide (CHS) and rod position (RP)
- No changing pressure gradient
- Higher dynamic in RP signal
- CHS peak nearly 2nd rod load reversal point decreases
- CHS vibration is increasing nearly 1st rod load reversal point increases
Conclusion
- Babbitt metal wear will be collected
- Possibly caused with lower lubrication
