Reliability analysis of subsea control system using FMEA and FFTA
Chao Liu1,2,3, Guangxin Li3, Wensheng Xiao4,5
1College of Electromechanical Engineering, Qingdao University of Science & Technology, Qingdao, 266061, China.
Scientific Reports
|December 2, 2024
Summary
This study introduces a combined Failure Mode and Effects Analysis (FMEA) and Fuzzy Fault Tree Approach (FFTA) for subsea control systems. This method enhances reliability analysis by identifying and quantifying risks to ensure safe operations.
Area of Science:
- Reliability Engineering
- Marine Technology
- Risk Management
Background:
- Subsea control systems are critical for offshore operations, demanding high reliability.
- Ensuring the safety and integrity of these complex systems is paramount.
- Existing reliability analysis methods may not fully capture the complexities of subsea systems.
Purpose of the Study:
- To develop and apply a hybrid FMEA-FFTA approach for comprehensive reliability analysis of subsea control systems.
- To qualitatively and quantitatively assess system failure modes and their impact.
- To identify critical components and failure pathways for targeted risk mitigation.
Main Methods:
- Failure Mode and Effects Analysis (FMEA) for qualitative assessment of failure modes and causes.
- Risk matrix application to prioritize failure modes based on severity.
- Fuzzy Fault Tree Approach (FFTA) for quantitative reliability analysis, including minimum cut set determination.
- Fuzzy set theory integration for probabilistic failure calculation and importance analysis.
Main Results:
- The FMEA-FFTA method provides a dual qualitative and quantitative evaluation of subsea control system reliability.
- Identification of high-risk, medium-high risk, and medium-risk failure modes within the system.
- Pinpointing of weak points in subsystems through probabilistic importance analysis.
Conclusions:
- The integrated FMEA-FFTA methodology offers a robust framework for subsea control system reliability.
- Prioritizing preventive protection and regular testing for identified high-risk failure modes is crucial.
- This approach supports enhanced safety and operational integrity in subsea environments.
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