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A New Heat Treatment Technology for On-Site Life Extension of High Energy Pipe Weldments Degraded by Creep Damage

[+] Author Affiliations
Fumitoshi Sakata, Masashi Ozaki, Nobuhiko Nishimura, Akira Shiibashi, Masahiro Kobayashi

Mitsubishi Heavy Industries, Ltd., Yokohama, Japan

Ko Takeuchi, Hideshi Tezuka

Tokyo Electric Power Company, Inc., Tokyo, Japan

Paper No. PVP2008-61493, pp. 549-554; 6 pages
doi:10.1115/PVP2008-61493
From:
  • ASME 2008 Pressure Vessels and Piping Conference
  • Volume 7: Operations, Applications and Components
  • Chicago, Illinois, USA, July 27–31, 2008
  • Conference Sponsors: Pressure Vessels and Piping
  • ISBN: 978-0-7918-4830-2 | eISBN: 0-7918-3828-5
  • Copyright © 2008 by ASME

abstract

This report presents the development of technology enabling temporary countermeasures for the on-site application of life-extending induction heating to high energy pipe weldments having experienced degradation due to creep. The results of an investigation into the cross-sectional structure thus suggested that material life can be extended by the application of regenerative heat treatment. The life-extending effect of regenerative heat treatment is greatest toward the short-life vicinity of the pipes outer surface, thus providing an efficient life extension. The remaining life converted for an actual installation from the result of real scale creep burst test increased from 63,000hrs before treatment to 200,000hrs after treatment, confirming that life can be extended by approximately 130,000hrs.

Copyright © 2008 by ASME

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