Affiliation:
1. Institute of Process Equipment, Zhejiang University, Hangzhou 310027, P. R. China
2. Institute of Process Equipment, Zhejiang University, Hangzhou 310027, P. R. China; Zhejiang Special Equipment Inspection and Research Institute, Hangzhou 310020, P. R. China
Abstract
Polyethylene (PE) pipes are widely used in transporting natural gas since 1960s. However, there are few published literatures on method for safety assessment of PE pipes. This paper introduces recent work in developing ultrasonic nondestructive testing (NDT) equipment and research on safety assessment of electrofusion (EF) joints of PE pipes. According to the geometrical characteristics and ultrasonic response, defects in EF joints can be divided into four categories, i.e., poor fusion interface, voids, structural deformity, and over welding. The defect of the poor fusion interface includes three typical forms, i.e., cold welding, unscraped oxide skin, and contamination of the fusion interface. Cold welding, which is the most common and dangerous defect, has been successfully detected by using ultrasonic NDT equipment and assessed with a patented cold welding Eigen-line method.
Subject
Mechanical Engineering,Mechanics of Materials,Safety, Risk, Reliability and Quality
Reference38 articles.
1. Environmental Oxidation Processes in Yellow Gas Pipe: Implications for Electrowelding;Allen;Polym. Degrad. Stab.
2. Review of the Electrofusion Joining Process for Polyethylene Pipe Systems;Bowman;Polym. Eng. Sci.
3. Investigation of Appropriate Cooling Times for Electrofusion Jointing of PE pipes for Gas distribution;Higuchi;Polym. Eng. Sci.
4. Shi, J. F., Zheng, J. Y., Guo, W. C., and Qin, Y., “Defects Classification and Failure Modes of Electrofusion Joint for Connecting Polyethylene Pipes,” J. Appl. Polym. Sci., in press.
Cited by
6 articles.
订阅此论文施引文献
订阅此论文施引文献，注册后可以免费订阅5篇论文的施引文献，订阅后可以查看论文全部施引文献