Reliability and FMECA analysis of helium refrigeration cycle in hydrogen liquefaction system
To satisfy the requirement of safe and stable operation of the helium refrigeration cycle system during liquid hy-drogen production,Reliability Block Diagram(RBD)and Failure Mode,Effects,and Criticality Analysis(FMECA)were com-bined and studied.Based on the actual production data and the equipment failure data from users of similar liquid hydrogen sys-tem,a comprehensive and in-depth stability analysis of the helium refrigeration cycle system was carried out by the reliability a-nalysis software PosVim.The results show that the helium refrigeration cycle system has a design life of 350 000 h,and the relia-bility of the system is 99.81％for 2 160 h of operation,93.83％for 50 000 h of operation,and 84.53％for 87 600 h of opera-tion,and it can be operated stably in the expected production cycle.17 failure models were analysed and risk mitigation measures were proposed by FMECA in conjunction with RBD analysis to improve the reliability and safety of this helium refrigeration cycle system.
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