Risk Based Inspection for Prioritizing Repair and Inspections of Large Numbers of Platforms in Gulf of Suez

GUPCO has more than hundred platforms located in Gulf of Suez that require topsides and underwater inspections on a regular basis as a part of integrity management system. Because of the high cost of underwater inspections and repair, GUPCO has developed a risk-based process to more effectively implement inspection resources. The process is based upon the critical key characteristics of each platform (year designed, number of legs, framing configuration, manning level, etc.) as well as results from previous inspections (date of last inspection, amount of inspection, flooded members, cut member, excessive marine growth, anode status, etc.). Using this information, the overall “risk” of the platform is determined using a rule-based scoring estimation of the likelihood and consequence of failure. In parallel, the severe damage platform structure is assessment by performing pushover analysis. The platforms are then ranked from highest to lowest risk, with the highest risk platforms receiving priority for repair and inspections. By calculating the likelihood of failure which is the main part of the assessment it is found that the age is the main factor affecting the structure condition. So from this paper one can calculate approximate value for failure likelihood occurring to the structure by knowing its age.