STRESS EVALUATION FOR CLASS 2 AND 3 PIPES WITH REINFORCEMENT AND WALL-THINNING USING EQUIVALENT STIFFNESS CONCEPT

Jae Yoon Kim, Jin Ha Hwang, Yun Jae Kim

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Due to various reasons, wall-thinning can occur in nuclear piping under the operating environment. When wall-thinning occurs in large-diameter Class 2 and 3 pipes, reinforcement is typically applied before replacement. To check structural integrity of reinforced pipes, stress analysis should be performed, which is not straightforward due to three-dimensional nature of reinforced pipes. Full 3-D FE analysis would not be so useful because calculated stresses would not be compatible to the equations given in ASME BPVC Sec. III NC/ND-3650 for Class 2 and 3 piping system. In this paper, stress evaluation methods for reinforced wall-thinned pipes are presented using the equivalent straight pipe concept. The equivalent straight pipe is defined as the pipe having the same elastic stiffness as reinforced wall-thinned pipe. Analytical expressions for the stiffness of wall-thinned pipe with reinforcement are given for axial tension and bending moment, using which the dimensions of the equivalent pipe can be obtained. The equations in ASME BPVC Sec. III NC/ND-3650 for Class 2 and 3 piping system are then used using the dimensions of the equivalent pipe. Finally, a method to quantify the stress concentration factor of reinforced wall-thinned pipe for fatigue evaluation is presented using the structural stress method.

Original languageEnglish
Title of host publicationMaterials and Fabrication
PublisherAmerican Society of Mechanical Engineers (ASME)
ISBN (Electronic)9780791887486
DOIs
Publication statusPublished - 2023
EventASME 2023 Pressure Vessels and Piping Conference, PVP 2023 - Atlanta, United States
Duration: 2023 Jul 162023 Jul 21

Publication series

NameAmerican Society of Mechanical Engineers, Pressure Vessels and Piping Division (Publication) PVP
Volume5
ISSN (Print)0277-027X

Conference

ConferenceASME 2023 Pressure Vessels and Piping Conference, PVP 2023
Country/TerritoryUnited States
CityAtlanta
Period23/7/1623/7/21

Bibliographical note

Publisher Copyright:
© 2023 American Society of Mechanical Engineers (ASME). All rights reserved.

Keywords

  • ASME BPVC Sec. III
  • Equivalent Stiffness Concept
  • Reinforced wall-thinned Class 2 and 3 pipes
  • Stress evaluation

ASJC Scopus subject areas

  • Mechanical Engineering

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