Residual lifetime assessment of cold-reheater pipe in coal-fired power plant through accelerated degradation test

Myung-Yeon Kim, Dong-Ju Chu, Young-Kook Lee, Jae-Hyeok Shim and Woo-Sang Jung

Reliability Engineering and System Safety, 2019, vol. 188, issue C, 330-335

Abstract: Non-destructive testing (NDT) is the process of evaluating and inspecting materials without damage. The purpose of present study is to evaluate the residual lifetime of materials by proposing a new concept of non-destructive testing. The residual lifetime of service-exposed 1.25Cr-0.5Mo (P11) steel cold-reheater pipes in a coal-fired power plant, which were used for approximately 23 years at 310 °C, was investigated with accelerated degradation tests of a fresh P11 steel. The hardness and the microstructure of the P11 steel aged at 550 °C for 1000 h were similar to those of the service-exposed cold-reheater pipe. The creep-rupture tests of the steel aged at 550 °C for 1000 h were performed under various temperature and stress conditions together with the fresh steel. The creep-rupture properties analyzed using a Larson–Miller parameter (LMP) approach suggested that the residual lifetime of the service-exposed pipes is approximately 53% at the current conditions. The proposed methodology is expected to serve as a useful tool to check the timing of materials replacement and to maintain safety in a coal-fired power plant.

Keywords: 1.25Cr-0.5Mo steel; Cold-reheater pipe; Creep; LMP; Residual lifetime (search for similar items in EconPapers)
Date: 2019
References: View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:reensy:v:188:y:2019:i:c:p:330-335

DOI: 10.1016/j.ress.2019.03.043

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