In recent years, hydrogen gas has been gaining favor as a valuable energy transition option to help reducing carbon emissions. This transition requires hydrogen storage and distribution infrastructure with consideration of failure modes such as hydrogen embrittlement that is typically not a concern for other fuel types. ASME BPV Section VIII, Division 3, Article KD-10 has special requirements for vessels in hydrogen service. Although Article KD-10 has been in existence since the release of 2007 Edition of the Code, few studies have been done to compare conventional ASME Section VIII, Division 2 fatigue evaluation in air environment with ASME Section VIII, Division 3 fracture mechanics-based evaluation in gaseous hydrogen environment. This paper presents a comparison study of the calculated fatigue life using these two methods (S-N in air vs fracture mechanics in hydrogen) for different crack-like flaw sizes with the consideration of the current rules in both ASME Section VIII Division 3 and API 579 / ASME FFS-1 Codes. The comparison in this paper utilizes fatigue and fracture data of material in hydrogen service published by Sandia National Laboratories and various authors.

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