Abstract
In RBUI method, platform with higher risk level will need inspection done more intensively than those with lower risk level. However, the probability of failure (PoF) evaluation in RBUI method is usually carried out in semi quantitative way by comparing failure parameters associated with the same damage mechanism between a group of platforms located in the same area. Therefore, RBUI will not be effective for platforms spread in distant areas where failure parameter associated with the same damage mechanism may not be the same. The existing standard, American Petroleum Institute, Recommended Practice for Structural Integrity Management of Fixed Offshore Structures (API RP-2SIM), is limited on the general instructions in determining the risk value of a platform, yet it does not provide a detail instruction on how determining the Probability of Failure (PoF) of platform. In this paper, the PoF is determined quantitatively by calculating structural reliability index based on structural collapse failure mode, thus the method in determining the inspection schedule is called Risk-Reliability Based Underwater Inspection (RReBUI). Models of 3-legs jacket fixed offshore platform in Java Sea and 4-legs jacket fixed offshore platform in Natuna Sea are used to study the implementation of RReBUI.
Highlights
Risk Based Underwater Inspection (RBUI) method has been developed and implemented in offshore platform inspection in Indonesia [1]
Time Based Inspection (TBI) is conducted regularly based on the types of inspection
By using Risk-Reliability Based Underwater Inspection (RReBUI) method, risk on every platform can be determined quantitatively without comparing failure parameter based on expert justification
Summary
Risk Based Underwater Inspection (RBUI) method has been developed and implemented in offshore platform inspection in Indonesia [1]. The inspection of offshore platform used Time Based Inspection (TBI) system in accordance to Indonesian government regulations since 1977. TBI is conducted regularly based on the types of inspection. Minor inspection is carried out annually, while major inspection was carried out once for 2 years, and complete inspection was carried out once for four years [2]. Due to the development of technology and demand in efficiency, Indonesian government encourages application of RBUI method as an alternative of TBI in determining inspection interval. By RBUI method, platform with higher risk level will need more often inspection than those with lower risk level
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