Session: DA-02-02 Design and Analysis of Piping Components-2

Paper Number: 123193

123193 - Design and Evaluation of Polyethylene Electrofusion Joints Based on Stress Classification 

The electrofusion joint is the main connection mode of the non-metallic pipeline. As a structural discontinuity, the structural performance evaluation of joints is very important for the safety of the pipeline system. For this complex structure, the design-by-rules method cannot accurately assess its safety, and the design-by-analysis method is more suitable for electrofusion joints with more complex stress distribution and can accurately evaluate the stresses that may lead to different failure modes. However, current analysis and design sections, such as those in ASME BPVC Ⅷ-2, do not provide statements for electrofusion joints, and their applicability is still unknown. In this study, a finite element model suitable for the stress analysis of the electrofusion joint was established, the stress intensity of different stress classification lines under short-time blasting conditions was extracted, and the stresses in the cold-welding zone and the fusion zone were classified, and the principal stress, secondary stress and peak stress of the electrofusion joint were determined. The various stress combinations are then assessed according to the stress intensity limits specified in ASME BPVC Ⅷ-2 to predict the possible failure forms and whether the fusion joint meets the safety requirements. This work provides an important reference for stress classification and stress assessment of electrofusion joints and determines whether ASME BPVC Ⅷ-2 is suitable for electrofusion joints.

Presenting Author: Xinwei Zong Zhejiang University

Presenting Author Biography: Xinwei Zong is a post-graduate student of Zhejiang University.

Authors:

Xinwei Zong Zhejiang University
Riwu Yao Zhejiang University
Jianfeng Shi Zhejiang University