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

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Hasegawa, Kunio Li, Yinsheng Bezensek, Bostjan Hoang, Phuong
Copyright Year	2012
Abstract	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 7.73R·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.
Sponsorship	Pressure Vessels and Piping Division
Starting Page	131
Ending Page	137
Page Count	7
File Format	PDF
ISBN	9780791855003
DOI	10.1115/PVP2012-78736
Volume Number	Volume 1: Codes and Standards
Conference Proceedings	ASME 2012 Pressure Vessels and Piping Conference
Language	English
Publisher Date	2012-07-15
Publisher Place	Toronto, Ontario, Canada
Access Restriction	Subscribed
Subject Keyword	Collapse Compressive stress Power stations Tension Finite element analysis Wall thickness Pipes Torsion Pressure
Content Type	Text
Resource Type	Article

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