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Research Papers: Design and Analysis

Plastic Collapse Stresses Based on Flaw Combination Rules for Pipes Containing Two Circumferential Similar Flaws

[+] Author and Article Information
Kunio Hasegawa, Yinsheng Li

Japan Atomic Energy Agency (JAEA),
Tokai-mura,
Naka-gun, Ibaraki-ken 319-1195, Japan

Yun-Jae Kim

Korea University,
1,5-ka, Anam-Dong,
Sungbuk-ku, Seoul 136-701, South Korea

Valery Lacroix

Tractebel Engineering (ENGIE),
Bd. Simon Bolivar 34-36,
Brussels B-1000, Belgium

Bohumir Strnadel

Center of Advanced Innovation Technologies,
VSB-Technical University of Ostrava,
17. listopadu 15/2172,
Ostrava-Poruba 708 33, Czech Republic

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received August 8, 2018; final manuscript received February 19, 2019; published online March 21, 2019. Assoc. Editor: Andrew J. Duncan.

J. Pressure Vessel Technol 141(3), 031201 (Mar 21, 2019) (5 pages) Paper No: PVT-18-1145; doi: 10.1115/1.4042991 History: Received August 08, 2018; Revised February 19, 2019

When discrete multiple flaws are in the same plane, and they are close to each other, it can be determined whether they are combined or standalone in accordance with combination rules provided by fitness-for-service (FFS) codes. However, specific criteria of the rules are different among these FFS codes. On the other hand, plastic collapse bending stresses for stainless steel pipes with two circumferential similar flaws were obtained by experiments, and the prediction procedure for collapse stresses for pipes with two similar flaws was developed analytically. Using the experimental data and the analytical procedure, plastic collapse stresses for pipes with two similar flaws are compared with the stresses in compliance with the flaw combination criteria. It is shown that the calculated plastic collapse stresses based on the flaw combination criteria are significantly different from the experimental and analytical stresses.

FIGURES IN THIS ARTICLE
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Copyright © 2019 by ASME
Topics: Stress , Pipes , Collapse
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References

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Figures

Grahic Jump Location
Fig. 1

Nomenclature and stress distribution of a pipe with two symmetrical flaws

Grahic Jump Location
Fig. 2

Plastic collapse stresses for pipes with two circumferential similar surface flaws

Grahic Jump Location
Fig. 3

Plastic collapse stresses for pipes with θ = 60 deg in accordance with combination criterion

Grahic Jump Location
Fig. 4

Plastic collapse stresses for pipes with θ = 45 deg in accordance with combination criterion

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