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Simulation of Degraded Repair Weld and Serviceability Assessment of Petroleum Pressure Vessel

[+] Author Affiliations
Rinzo Kayano, Tatsuo Hasegawa

Japan Steel Works, Ltd., Muroran, Hokkaido, Japan

Hirokazu Inoue

Nippon Mitsubishi Petroleum Refining Company, Ltd., Muroran, Hokkaido, Japan

Paper No. PVP2002-1311, pp. 67-74; 8 pages
doi:10.1115/PVP2002-1311
From:
  • ASME 2002 Pressure Vessels and Piping Conference
  • Fitness for Service Evaluations and Non-Linear Analysis
  • Vancouver, BC, Canada, August 5–9, 2002
  • Conference Sponsors: Pressure Vessels and Piping Division
  • ISBN: 0-7918-4653-9
  • Copyright © 2002 by ASME

abstract

In order to simulate temper and hydrogen embrittlement in 2.25Cr-1Mo pressure vessel steel in the laboratory, test specimen exceeding 100 mm (4 in.) in thickness containing repair welds made with the shielded metal arc welding (SMAW) process were exposed to hydrogen environment in an autoclave. By investigating the dilution, hardness and microstructure characteristics of the specimen repair welds, it was possible to determine a standard repair technique including minimum stainless steel overlay thickness. From the test results, it was concluded that a minimum of 3.0 mm (1/8 in.) residual overlay thickness was recommended as part of the repair technique by SMAW. In addition, tensile tests of the hydrogen exposed specimens confirmed the serviceability of recent and old generation 2.25Cr-1Mo pressure vessel steel repair welds. In particular, the effect of temper and hydrogen embrittlement on serviceability was examined by detailed observation of microstructure and fracture surface of the tensile specimens.

Copyright © 2002 by ASME

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