Abstract
Reliability-Availability-Maintainability (R-A-M) is one of the most important sets of functional requirements for a Blowout Preventer (BOP) system. Requirements derived from R-A-M are key for the success of pressure control and the BOP system. Using the design for reliability (DfR) process and system engineering approach, the team established feasible reliability and maintainability requirements based on field performance of similar equipment, performed risk analysis to identify necessary mitigations, and allocated system requirements to the various subsystems. Consequently, the team created system models to assess system reliability as subsystem data is captured. Where necessary, subsystem reliability demonstration tests were executed. The test and analysis results from the components are integrated, via reliability modeling approaches, to the system-level. These results will demonstrate the mean time between maintenance and drilling availability for the BOP system, as well as the probability to perform on-demand for each critical BOP function. The test and analysis results also help identify the weakest link in the system to proactively drive design improvement, and determine the optimal maintenance strategy. The methodology presented in this paper is not only essential to ensure the R-A-M of the BOP system under design, but can be applied to other DfR work.
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