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Effect of Torsion on Collapse Bending Moment for 24-Inch Diameter Schedule 80 Pipes With Wall Thinning

[+] Author Affiliations
Kunio Hasegawa, Yinsheng Li

Japan Nuclear Energy Safety Organization (JNES), Tokyo, Japan

Bostjan Bezensek

Hunting Energy Service (UK) Ltd., Scotland, UK

Phuong Hoang

Sargent and Lundy LLC, Chicago, IL

Paper No. PVP2012-78736, pp. 131-137; 7 pages
  • ASME 2012 Pressure Vessels and Piping Conference
  • Volume 1: Codes and Standards
  • Toronto, Ontario, Canada, July 15–19, 2012
  • Conference Sponsors: Pressure Vessels and Piping Division
  • ISBN: 978-0-7918-5500-3
  • Copyright © 2012 by ASME


Piping items in power plants may experience combined bending and torsion moments during operation. Currently, there is a lack of guidance in the ASME B&PV Code Section XI for combined loading modes including pressure, torsion and bending. Finite element analyses were conducted for 24-inch diameter Schedule 80 pipes with local wall thinning subjected to tensile and compressive stresses. Plastic collapse bending moments were calculated under constant torsion moments. From the calculation results, it can be seen that collapse bending moment for pipes with local thinning subjected to tensile stress is smaller than that subjected to compressive stress. In addition, equivalent moment is defined as the root the sum of the squares of the torsion and bending moments. It is found that the equivalent moments can be approximated with the pure bending moments, when the wall thinning length is equal or less than 7.73Display FormulaR·t for the wall thinning depth of 75% of the nominal thickness, where R is the mean radius and t is the wall thickness of the pipe.

Copyright © 2012 by ASME
Topics: Torsion , Pipes , Collapse



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