Apache Forties Assets
A top down approach was used to develop a Risk Based Inspection (RBI) schedule for the Apache Forties Assets. This approach identified corrosion circuits at a P&ID level across each of the five North Sea assets; Alpha, Bravo, Charlie, Delta and Echo. This enabled an assessment of the probability of corrosion and the consequence of failure on each circuit to be clearly defined through a set of structured questions. This is in contrast to assessing the corrosion risks on each individual item of piping.
- To reflect recent platform modifications in the ACET database, the latest P&IDs were reviewed, corrosion circuits allocated and redundant and missing lines identified. A dead leg register was also prepared for upload into the database.
- After the identification of suitable corrosion circuits, the preparation of detailed RBI methodology was carried out for all pipework and vessels in a workshop format.
- The corrosion assessment/Risk Based Assessment (RBA) meetings were chaired by CAPCIS and the workshop attended by Apache integrity operations and process engineers, in addition to inspection engineers, to validate the workshop output. This workshop-based approach used the ACET database to drive the structured questions and responses.
- The output of the workshops: production of a risk matrix and risk profiles for all circuits, were used to generate a risk based inspection plan along with key monitoring activities that were captured in the ACET RBA output (equivalent to a Written Scheme of Examination) and embedded into the Apache Integrity Management System.
- Continued support was provided and chairing of quarterly inspection reviews meetings. Production of an inspection calendar from RBA assessments and risk matrices in a format that allowed input into the MAXIMO maintenance management system. Also, preparation of written inspection schemes for all vessels and pipework systems.
This process was carried out for Charlie initially, the largest platform followed by the other four Apache assets in turn. This enabled the procedure to be completed for Charlie and the output embedded rather than trying to complete all assets in one stage.
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