Previous attempts by the maintenance department to find a solution to the trips had failed.
Examining the problem in isolation using FMECA did not and would not resolve the root causes as the problem related to the way in which the plant operated.
ProAIM decided to use FTA bringing process, operations and maintenance together to conduct a RCA of the situation. 6 compressors were examined in the Naphtha trains, 140 trip events examined identifying process conditions that caused the compressors to trip, and the reason for this was due to the trip limits within the equipment were set too low.
These were recalculated and validated using a HAZOP trips study to ensure that the new set points would not impose any risks and tested these new set points on the plant with our engineers before updating the operational philosophy and documentation.