Remnant life assessment of service-exposed pendent superheater tubes |
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| Affiliation: | 1. Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education, School of Chemistry and Materials Science, Heilongjiang University, Harbin, 150080, PR China;2. School of Chemistry and Chemical Engineering, Anhui University of Technology, Maanshan, Anhui, 243002, PR China;3. Zhejiang Chilwee Chuangyuan Industry Co, Ltd, Changxing, Zhejiang, 313100, PR China;4. School of Resources and Materials, Northeastern University at Qinhuangdao, Qinhuangdao, 066004, PR China;1. Department of Mechanical Engineering, Tokyo Institute of Technology, O-okayama 2-12-1, Meguro-ku, Tokyo 152-8552, Japan;2. Department of Mechanical Engineering, Nagaoka University of Technology, Kami-tomioka 1603-1, Nagaoka, Niigata 940-2188, Japan;1. Department of Mechanical Engineering, University of Arkansas, Fayetteville, AR, United States;2. Department of Mechanical Engineering, Chung Ang University, Seoul, South Korea;1. National Centre for Nuclear Research, st. A. Soltana 7/23, Otwock-Swierk, Poland;2. Faculty of Materials Science and Ceramics, AGH University of Science and Technology, av. Mickiewicza 30, 30-059, Krakow, Poland;3. Institute of Logistics and International Management, Czestochowa University of Science and Technology, av. Armii Krajowej 19, 42-200, Czestochowa, Poland;4. LaSIE UMR-CNRS 7356, Pole Science et Technologie, Université de La Rochelle, Av. M. Crépeau, 17042, La Rochelle Cedex, France |
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| Abstract: | Remnant life assessment and life extension has become an integral part of plant maintenance activities, Cr–Mo steels are widely used in thermal power plants at a temperature of about 550°C. This paper deals with the high temperature tensile and creep rupture properties of 1Cr–0.5Mo steels for pendent superheater tubes in a boiler of a thermal power plant after five years service exposure for 43,000 h. Based on stress vs Larson Miller Parameter plot and at the operating hoop stress level, the pendent superheater tubes in general are found to be in a good state of health and can continue to remain in service for a length of 10 years, provided the temperature of the tube is brought down below 500°C. This observation may not be true for those selected tubes where already expansion in the diameter has taken place. Such tubes should be identified and replaced. In the case that it is not possible to bring down the temperature below 500°C, it may be desirable to use a superior grade of material like 2.25Cr–1Mo or 9Cr–1Mo steel. A thicker tube of the same grade may also be considered provided the overall load of the panel does not exceed the limit. It is, however, recommended that a similar health check be carried out after five years. |
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