Abstract
The Hydraulic submersible pump system (HSPS) is integral to the offloading of oil on offshore platforms and oil tankers. Due to the inflammable and explosive properties of the oil, the working process of HSPS is of high risk. Therefore, this study focused on the safety assessment of HSPS, key potential failure modes of HSPS were identified. A Fuzzy Failure Mode Effects and Criticality Analysis (FFMECA) model was proposed based on fuzzy logic theory and failure mode effects and criticality analysis (FMECA) method. Fuzzy linguistic terms were used to assess the Occurrence (O), Severity (S), and Detection (D) of the identified failure modes. The weights for O, S, and D were calculated based on experts’ ratings and entropy theory. A case study was carried out and the Fuzzy Risk Priority Numbers (FRPNs) for the failure modes were obtained. The results highlighted that 5 failure modes, namely wear of bearings, failure of mechanical seal, failure of rotary seal, zero pressure on the outlet and influence of excessive temperatures, were of critical level and required immediate preventive action. Risk control measures were proposed to ensure the safety of HSPS in practical application and to improve the reliability of system operation.
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