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An Alarming Increase in Catastrophic Thermal Fatigue Failures in Cold Reheat Lines: QAE NDI for On-Line, Post Thermal Shock/Water Hammer Assessment

[+] Author Affiliations
Dan Ezra

Margan Inc., Atlanta, GA

James Yagen

Yagen Consulting, Decatur, IL

Paper No. POWER2009-81028, pp. 311-314; 4 pages
doi:10.1115/POWER2009-81028
From:
  • ASME 2009 Power Conference
  • ASME 2009 Power Conference
  • Albuquerque, New Mexico, USA, July 21–23, 2009
  • Conference Sponsors: Power Division
  • ISBN: 978-0-7918-4350-5 | eISBN: 978-0-7918-3853-6
  • Copyright © 2009 by ASME

abstract

Cold Reheat Piping has received little attention in power plants for many years. Carbon Steel piping that handles steam at 500 F to 600 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. A number of catastrophic failures in Cold Reheat Piping have occurred in recent years. Most of these recent failures can be traced back to water hammer or a change 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.

Copyright © 2009 by ASME

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