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Research Papers: Design and Analysis

Plastic Collapse Moment for Weld Overlay Pipe With Multiple Circumferential Flaws

[+] Author and Article Information
Kunio Hasegawa

e-mail: hasegawa-kunio@ jnes.go.jp

Yinsheng Li

Japan Nuclear Energy
Safety Organization (JNES),
Toranomon 4-1-28, Minato-ku,
Tokyo 105-0001, Japan

Masayoshi Shimomoto

Mizuho Information and
Research Institute (MHIR),
Kanda-Nishikicho 2-3, Chiyoda-ku,
Tokyo 101-8443, Japan

1Corresponding author.

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received December 11, 2011; final manuscript received March 19, 2013; published online September 18, 2013. Assoc. Editor: Xian-Kui Zhu.

J. Pressure Vessel Technol 135(5), 051208 (Sep 18, 2013) (8 pages) Paper No: PVT-11-1224; doi: 10.1115/1.4024438 History: Received December 11, 2011; Revised March 19, 2013

Weld overlay is one of the useful repair methods for cracked piping that has been successfully applied for piping in many nuclear power plants. This paper proposes an approach for predicting plastic collapse moment for weld overlaid piping with single and multiple circumferential part-through flaws, using a new flaw depth parameter for weld overlay. The formulas for plastic collapse moments for weld overlaid pipes can be simply expressed by similar equations for a single flaw and multiple flaws using the parameter.

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Figures

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Fig. 2

Nomenclature and stress distribution of a pipe with a circumferential flaw

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Fig. 3

Flaw depth parameter f(r)

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Fig. 4

Two-layered material net-section stress distribution (θ + βWOL ≤  π)

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Fig. 5

Two-layered material net-section stress distribution (θ + βWOL > π)

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Fig. 6

Two-layered material net-section stress distribution, where crack tip is in WOL (2θ <  36 deg)

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Fig. 7

Two-layered material net-section stress distribution, where crack tip is in WOL (2θ ≥ 36 deg)

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Fig. 8

Two flaws in original pipe with WOL

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Fig. 9

Flaws in both original pipe and overlaid weld metal

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Fig. 10

Two flaws in overlaid weld metal.

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Fig. 11

Collapse bending moments for 24-in. diameter Sch. 80 pipes (twin flaws 2θ = 30 deg, single flaw 2θ = 60 deg, tW/tB = 0.5, σm/σfB = 0.3). (a) Collapse bending moments for pipes with two flaws and a single flaw as a function of flow stress ratios and (b) ratio of collapse bending moments for pipes with two flaws and a single flaw as a function of angles between two flaws

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