Using 3-P Weibull Distribution Evaluate Reliability of DDV and SPM Valve Hydraulic System of BOP

The direct drive valve and subplate mounted valve are critical components of the blowout preventer’s hydraulic system. The reliability analysis theory is used to analyze the service life of direct drive valve valves and subplate mounted valve valves in order to improve their reliability. The fault data is analyzed and Weibull probability plot is fitted, which is determined to follow the Weibull distribution of three parameters. The Weibull parameters are estimated by maximum likelihood estimation, and the optimal solution is obtained by particle swarm optimization. The probability density function reliability function and failure rate function are obtained. The results show that the direct drive valve and subplate mounted valve fault data follow the three-parameter Weibull distribution, and the average direct drive valve fault time is 2700 times, for subplate mounted valve is 6000 times.