Cold Reheat Piping in power plants has received little attention for many years. Carbon Steel piping that handles steam at 500 F to 700 F has only had problems when not properly supported or water hammered on start up. Most recorded failures have been mechanical fatigue at a girth weld. Excessive attemperation in both coal fired plants and combined cycle ones, has become a routine practice. Consequently the number of failures (catastrophic or non-catastrophic) in Cold Reheat Piping have occurred in recent years. Most of these recent failures can be traced back to water hammer or a thermal shock due to changes in the operation of attemperator sprays. This paper shows how a Cold Reheat Piping system, that was included in a nondestructive test program, failed in a short period of time due to thermal fatigue, from a change in spray operation.
Thermal Shock: Early Stage Damage Detection and Monitoring or .....Failure Analysis
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Ezra, D, & Yagen, J. "Thermal Shock: Early Stage Damage Detection and Monitoring or....Failure Analysis." Proceedings of the ASME 2011 Power Conference collocated with JSME ICOPE 2011. ASME 2011 Power Conference, Volume 2. Denver, Colorado, USA. July 12–14, 2011. pp. 25-33. ASME. https://doi.org/10.1115/POWER2011-55164
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