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Pressure Tests for Thickness Management of Wall Thinning Tees

[+] Author Affiliations
Kaina Teshima, Yoichi Iwamoto, Tomoyuki Oka

Mitsubishi Heavy Industries, Ltd., Takasago, Japan

Kiminobu Hojo

Mitsubishi Heavy Industries, Ltd., Kobe, Japan

Kunihiro Kobayashi

Tohoku Electric Power Co., Inc., Sendai, Japan

Syuichi Tsuno

Hokkaido Electric Power Co., Inc., Sapporo, Japan

Paper No. PVP2012-78685, pp. 123-130; 8 pages
doi:10.1115/PVP2012-78685
From:
  • ASME 2012 Pressure Vessels and Piping Conference
  • Volume 3: Design and Analysis
  • Toronto, Ontario, Canada, July 15–19, 2012
  • Conference Sponsors: Pressure Vessels and Piping Division
  • ISBN: 978-0-7918-5502-7
  • Copyright © 2012 by ASME

abstract

Although the minimum thickness of pipe wall required (tsr) of T-joints (tees) of class 2, 3 and lower classes of nuclear power plants in Japan is calculated from the design pressure and temperature, there is no rule or standard of wall thinning T-joints for thickness management.

This paper describes the pressure tests procedure and six test results with parameters of T-joint geometry such as outer diameter D, thickness T and T/D to establish structural integrity of wall thinning T-joints. Based on the fracture surface observation, a ductile crack initiation of each test mock-ups was confirmed.

Copyright © 2012 by ASME
Topics: Pressure

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