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, Woo Sang Jung

Research output: Contribution to journalArticle

1 Citation (Scopus)

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.

Original languageEnglish
Pages (from-to)330-335
Number of pages6
JournalReliability Engineering and System Safety
Volume188
DOIs
Publication statusPublished - 2019 Aug

All Science Journal Classification (ASJC) codes

  • Safety, Risk, Reliability and Quality
  • Industrial and Manufacturing Engineering

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