0
Research Papers: Codes and Standards

Technical Basis for Application of Collapse Moments for Locally Thinned Pipes Subjected to Torsion and Bending Proposed for ASME Section XI

[+] Author and Article Information
Kunio Hasegawa

Japan Atomic Energy Agency (JAEA),
Shirakata,
Tokai-mura 319-1195, Japan
e-mail: kunioh@kzh.biglobe.ne.jp

Yinsheng Li

Japan Atomic Energy Agency (JAEA),
Shirakata,
Tokai-mura 319-1195, Japan
e-mail: li-yinsheng@jaea.go.jp

Bostjan Bezensek

Shell UK, Ltd.,
1 Altens Farm Road,
Nigg, Aberdeen AB12 3YF, UK
e-mail: bostjan.bezensek@shell.com

Phuong H. Hoang

Sargent & Lundy LLC,
55 E Monroe,
Chicago, IL 60603
e-mail: phuong.h.hoang@sargentlundy.com

Howard J. Rathbun

Lawrence Livermore National Laboratories,
7000 East Avenue,
Livermore, CA 94550
e-mail: Rathbun4@llnl.gov

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received October 13, 2014; final manuscript received August 27, 2015; published online October 6, 2015. Assoc. Editor: Hardayal S. Mehta.

J. Pressure Vessel Technol 138(1), 011101 (Oct 06, 2015) (8 pages) Paper No: PVT-14-1167; doi: 10.1115/1.4031505 History: Received October 13, 2014; Revised August 27, 2015

Piping components in power plants may experience combined bending and torsion moments during operation. There is a lack of guidance for pipe evaluation for pipes with local wall-thinning flaws under the combined bending and torsion moments. ASME boiler and pressure vessel (B&PV) Code Section XI Working Group is currently developing fully plastic bending pipe evaluation procedures for pressurized piping components containing local wall thinning subjected to combined torsion and bending moments. Using elastic fully plastic finite element (FE) analyses, plastic collapse bending moments under torsions were obtained for 4 (114.3)–24 (609.6) in. (mm) diameter pipes with various local wall-thinning flaw sizes. The objective of this paper is to introduce an equivalent moment, which combines torsion and bending moments by a vector summation, and to establish the applicable range of wall-thinning lengths, angles, and depths, where the equivalent moments are equal to pure bending collapse moments.

FIGURES IN THIS ARTICLE
<>
Copyright © 2016 by ASME
Topics: Torsion , Pipes , Collapse
Your Session has timed out. Please sign back in to continue.

References

Li, Y. , Ida, W. , Hasegawa, K. , Hoang, P. , and Bezensek, B. , 2010, “ Effect of Pressure on Plastic Collapse Under the Combined Bending and Torsion Moments for Circumferentially Surface Flawed Pipes,” ASME Paper No. PVP2010-25102.
Hoang, P. , Hasegawa, K. , Bezensek, B. , and Li, Y. , 2010, “ Effect of Torsion on Equivalent Bending Moment for Limit Load and EPFM Circumferential Pipe Flaw Evaluations,” ASME Paper No. PVP2010-2528.
Bezensek, B. , Li, Y. , Hasegawa, K. , and Hoang, P. , 2010, “ Proposal for Inclusion of Torsion in Section XI Flaw Evaluation Procedures for Pipes Containing Surface Crack-Like Flaw,” ASME Paper No. PVP2010-25133.
Hoang, P. , Hasegawa, K. , Bezensek, B. , and Li, Y. , 2012, “ Effect of Torsion on Equivalent Bending Moment for Limit Load and EPFM Circumferential Pipe Flaw Evaluations,” ASME J. Pressure Vessel Technol., 134(6), p. 061206. [CrossRef]
Li, Y. , Hasegawa, K. , Hoang, P. , and Bezensek, B. , 2012, “ Prediction Method for Plastic Collapse of Pipes Subjected to Combined Bending and Torsion Moments,” ASME J. Pressure Vessel Technol., 134(6), p. 061207. [CrossRef]
Bezensek, B. , Li, Y. , Hasegawa, K. , and Hoang, P. , 2012, “ Inclusion of Torsion Loads in Section XI Flaw Evaluation Procedures for Pipes Containing Circumferential Planar Surface Crack-Like Flaw on the Basis of Limit Load Analysis,” ASME J. Pressure Vessel Technol., 134(3), p. 031003. [CrossRef]
Hasegawa, K. , Li, Y. , Bezensek, B. , and Hoang, P. , 2011, “ Evaluation of Torsion and Bending Collapse Moments for Pipes With Local Wall Thinning,” ASME Paper No. PVP2011-57839.
Hoang, P. , Hasegawa, K. , Bezensek, B. , and Li, Y. , 2011, “ Effect of Bending Moment and Torsion on the Internal Pressure Limit Load of Locally Thinned Pipes,” ASME Paper No. PVP2011-57731.
Bezensek, B. , Li, Y. , Hasegawa, K. , and Hoang, P. , 2011, “ Inclusion of Torsion With Bending and Pressure Loads for Pipes With Thinned Wall Region,” ASME Paper No. PVP-2011-57856.
Hasegawa, K. , Li, Y. , Bezensek, B. , and Hoang, P. , 2012, “ Effect of Torsion on Collapse Bending Moment for 24-inch Diameter Schedule 80 Pipes With Wall Thinning,” ASME Paper No. PVP2012-78736.
ASME Boiler and Pressure Vessel Code Section III, 2010, Rules for Construction of Nuclear Facility Components: Div. 1, Subsection NC, Class 2 Components, NC-3653.3, American Society of Mechanical Engineers, New York.
RCC-M, 2007, Design and Construction Rules for Mechanical Components for PWR Nuclear Island, Subsection C-3658, AFCEN, France.
ASME Boiler and Pressure Vessel Code Section XI, 2010, Rules for Inservice Inspection of Nuclear Power Plant Components, Appendix C, American Society of Mechanical Engineers, New York.
Miyazaki, K. , Kanno, S. , Ishiwata, M. , Hasegawa, K. , Ahn, S. H. , and Ando, K. , 2002, “ Fracture and General Yield for Carbon Steel Pipes With Local Wall Thinning,” Nuclear Engineering & Design, Vol. 211, Elsevier, Dordrecht, pp. 61–86. [CrossRef]
Hoang, P. , Bezensek, B. , and Rathbun, H. , 2013, “ A Benchmark Study of Bending Limit Load Finite Element Analysis for Locally Wall Thinned Pipes,” ASME Paper No. PVP2013-97837.
ASME Section XI, 2003, Code Case N-597-2, Requirements for Analytical Evaluation of Pipe Wall Thinning.

Figures

Grahic Jump Location
Fig. 1

Cantilever beam loading model of locally thinned pipe

Grahic Jump Location
Fig. 2

FE method mesh break down of shape of wall thinning inside a pipe

Grahic Jump Location
Fig. 3

Discrepancy between simple beam versus cantilever beam loading configuration

Grahic Jump Location
Fig. 4

Relationship between the bending moment and bending angle for a pipe with wall thinning of a/t = 0.75, 2θ = 90 deg, and L/D0 = 1.0

Grahic Jump Location
Fig. 5

Relationship between the bending moment and bending angle for a pipe with wall thinning of a/t = 0.75, 2θ = 90 deg, and L/D0 = 2.0

Grahic Jump Location
Fig. 6

Collapse bending moment and equivalent moment for a24 in. (609.6 mm) schedule 80 pipe with wall thinning of a/t = 0.75, 2θ = 90 deg, and L/D0 = 1.0

Grahic Jump Location
Fig. 7

Collapse bending moment and equivalent moment for a24 in. (609.6 mm) schedule 80 pipe with wall thinning of a/t = 0.75, 2θ = 90 deg, and L/D0 = 2.0

Grahic Jump Location
Fig. 8

Area of Meq = MB0 for pipes with wall thinning of a/t = 0.5

Grahic Jump Location
Fig. 9

Area of Meq = MB0 for pipes with wall thinning of a/t = 0.6

Grahic Jump Location
Fig. 10

Area of Meq = MB0 for pipes with wall thinning of a/t = 0.65

Grahic Jump Location
Fig. 11

Area of Meq = MB0 for pipes with wall thinning of a/t = 0.7

Grahic Jump Location
Fig. 12

Area of Meq = MB0 for pipes with wall thinning of a/t = 0.75: (a) 4 in. (114.3 mm) diameter pipes, (b) 12.75 in. (324 mm) diameter pipes, and (c) 16 in. (406.4 mm) and 24 in. (609.6 mm) pipes

Grahic Jump Location
Fig. 13

Summary of area of Meq = MB0 for pipe with wall thinning

Grahic Jump Location
Fig. 14

Proposal of applicable local wall-thinning area: (a) depth and length and (b) depth and angle

Tables

Errata

Discussions

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In