This paper is a case study in the comparison of different methods of evaluation of components in the creep range. The root of the problem derives from an interesting "fitness-for-purpose" question, in that the component, a header end cap, had only been in service for a few months and it therefore fell between a new part design review and a in-service, fitness-for-purpose analysis. This led to a comparison being made of different methods drawn both from design procedures, and from more recent fitness-for-service methods, initially with a view to developing a plausible and acceptable procedure for validating the design within the rules of the relevant section of the Code, but also as an exercise to explore the applicability of various methods being offered currently in, for instance, recent API guidelines.
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