Research On Reliability Evaluation Of Deep-Water Manual Gate Valve Based On Markov Method

As a key equipment of the subsea production system, the deep-water manual gate valve is typically in an extremely complex working environment, making its reliability crucial. In this paper, the reliability model of a deep-water manual gate valve is established according to the Markov method. The main failure modes of deep-water manual gate valve are failure to open on demand, failure to close on demand, leakage of fluid media, and leakage when closing by failure mode effects and criticality analysis. According to the established Markov equation set, the steady-state availability and mean time to failure of the system are calculated. The results show that the most effective way to improve the reliability of the deep-water manual gate valve is to reduce the failure rate during normal operation. Meanwhile, the repair time and test completion rate should be shortened and improved. According to the research results, this paper proposes a plan to standardize the valve manufacturing and establish a maintenance test system.