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Plastic Behaviour of Small Bore Piping Bend/Elbow Under Combined Internal Pressure and Bending Moment

[+] Author Affiliations
Xinjian Duan, Michael Kozluk

Atomic Energy of Canada, Ltd., Mississauga, ON, Canada

Paper No. PVP2011-57097, pp. 79-92; 14 pages
  • ASME 2011 Pressure Vessels and Piping Conference
  • Volume 2: Computer Technology and Bolted Joints
  • Baltimore, Maryland, USA, July 17–21, 2011
  • Conference Sponsors: Pressure Vessels and Piping Division
  • ISBN: 978-0-7918-4452-6
  • Copyright © 2011 by Her Majesty the Queen in Right of Canada


This paper presents some preliminary observations from six representative tests on the plastic behavior of small bore carbon steel piping bends/elbows with general and local wall loss subject to combined internal pressure and bending moment loading at typical CANDU® reactor operating temperature. These six tests include three materials (normalized elbow, stress relieved bend and cold worked bend), two piping sizes (NPS 2 and NPS 2 1/2), two loading modes (monotonic and cyclic) and three modes of failure (collapse, burst and leak). The test results show that a collapsed piping bend/elbow can still withstand five times design pressure without the loss of pressure boundary. The stress relieved bend appears to offer a compromise in the resistance to both environmental assisted cracking and plastic collapse relative to the normalized elbow and cold worked bend.

Copyright © 2011 by Her Majesty the Queen in Right of Canada
Topics: Pressure , Pipes



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