This report summarizes recent modifications and proposals of flaw evaluation methods by the Working Group on Flaw Evaluation and the Task Group for Piping Flaw Evaluation for the American Society of Mechanical Engineers (ASME) Boiler and Pressure Vessel Code, Section XI.
Main items of the modifications and proposals are as follows:
(1) Reference fatigue crack growth curves for carbon and low alloy ferritic steels in air environments.
(2) Allowable end-of-evaluation period flaw depth to thickness ratio in base metals (austenitic steel piping).
(3) Allowable end-of-evaluation period flaw depth to thickness ratio for circumferential flaws in flux welds (austenitic steel piping).
(4) A procedure for tearing instability analysis of flaws in piping.
(5) Evaluation of flaws in carbon steel piping.
(6) An equation to compute fatigue crack growth rates for austenitic stainless steels in air environments.
(7) Reference fatigue crack growth curves for austenitic steels in air environments.
(8) Recommended residual stress distributions for austenitic steel pipe welds.
(9) Recommended fatigue and corrosion crack growth rates for austenitic steels.
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