When a flaw is detected in a stainless steel piping system of a nuclear power plant during in-service inspection, the limit load estimation method provided in codes such as ASME Section XI or JSME S NA-1-2008 can be applied to evaluate the integrity of the pipe. However, in the current editions of these codes, a limit load estimation method is only provided for pipes containing a single flaw. Independent multiple flaws, such as stress corrosion cracks, have actually been detected in the same plane of stainless steel piping systems. In this paper, a failure estimation method by formula is proposed for any number and arbitrary distribution of multiple independent circumferential flaws in the same plane of a pipe. Using the proposed method, numerical solutions are compared with experimental results to validate the model, and several numerical examples are provided to show its effectiveness.
Prediction of Collapse Stress for Pipes With Arbitrary Multiple Circumferential Surface Flaws
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Li, Y., Hasegawa, K., Onizawa, K., and Cofie, N. G. (October 14, 2010). "Prediction of Collapse Stress for Pipes With Arbitrary Multiple Circumferential Surface Flaws." ASME. J. Pressure Vessel Technol. December 2010; 132(6): 061204. https://doi.org/10.1115/1.4001732
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