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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
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Copyright © 2016 by ASME
Topics: Torsion , Pipes , Collapse
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References

Figures

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Fig. 1

Cantilever beam loading model of locally thinned pipe

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Fig. 2

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

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Fig. 3

Discrepancy between simple beam versus cantilever beam loading configuration

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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

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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

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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

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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

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Fig. 8

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

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Fig. 9

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

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Fig. 10

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

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Fig. 11

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

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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

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Fig. 13

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

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Fig. 14

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

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