Reliability Analysis Method of a Control System for Subsea All-Electric Christmas Tree

The subsea all-electric Christmas tree (XT) is a key equipment in subsea production systems. Once it fails, the marine environment will be seriously polluted. Therefore, strict reliability analysis and measures to improve reliability must be performed before a subsea all-electric XT is launched; suc...

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Bibliographic Details
Published in:Journal of marine science and application 2021-06, Vol.20 (2), p.354-370
Main Authors: Liu, Peng, Chen, Qianqian, Zheng, Chao, Sun, Guofa
Format: Article
Language:English
Subjects:
Analysis
Availability
Common cause failures
Component reliability
Components
Control
Control systems
Electrical Machines and Networks
Engineering
Failure rates
Fault tolerance
Geotechnical Engineering & Applied Earth Sciences
Machinery and Machine Elements
Marine environment
Marine pollution
Markov chains
Offshore Engineering
Power Electronics
Reliability
Reliability analysis
Reliability aspects
Repair
Research Article
Subsea production systems
System reliability
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Summary:The subsea all-electric Christmas tree (XT) is a key equipment in subsea production systems. Once it fails, the marine environment will be seriously polluted. Therefore, strict reliability analysis and measures to improve reliability must be performed before a subsea all-electric XT is launched; such measures are crucial to subsea safe production. A fault-tolerant control system was developed in this paper to improve the reliability of XT. A dual-factor degradation model for electrical control system components was proposed to improve the evaluation accuracy, and the reliability of the control system was analyzed based on the Markov model. The influences of the common cause failure and the failure rate in key components on the reliability and availability of the control system were studied. The impacts of mean time to repair and incomplete repair strategy on the availability of the control system were also investigated. Research results show the key factors that affect system reliability, and a specific method to improve the reliability and availability of the control system was given. This reliability analysis method for the control system could be applied to general all-electric subsea control systems to guide their safe production.
ISSN:1671-9433
1993-5048
DOI:10.1007/s11804-021-00200-7