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.
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e-mail: jyzh@zju.edu.cn
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April 2012
Research Papers
Development of Nondestructive Test and Safety Assessment of Electrofusion Joints for Connecting Polyethylene Pipes
Jinyang Zheng,
e-mail: jyzh@zju.edu.cn
Jinyang Zheng
Institute of Process Equipment, Zhejiang University
, Hangzhou 310027, P. R. China
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Jianfeng Shi,
Jianfeng Shi
Institute of Process Equipment, Zhejiang University
, Hangzhou 310027, P. R. China
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Weican Guo
Weican Guo
Institute of Process Equipment, Zhejiang University, Hangzhou 310027, P. R. China;
Zhejiang Special Equipment Inspection and Research Institute
, Hangzhou 310020, P. R. China
Search for other works by this author on:
Jinyang Zheng
Institute of Process Equipment, Zhejiang University
, Hangzhou 310027, P. R. China
e-mail: jyzh@zju.edu.cn
Jianfeng Shi
Institute of Process Equipment, Zhejiang University
, Hangzhou 310027, P. R. China
Weican Guo
Institute of Process Equipment, Zhejiang University, Hangzhou 310027, P. R. China;
Zhejiang Special Equipment Inspection and Research Institute
, Hangzhou 310020, P. R. China
J. Pressure Vessel Technol. Apr 2012, 134(2): 021406 (5 pages)
Published Online: January 30, 2012
Article history
Received:
February 20, 2011
Revised:
August 10, 2011
Online:
January 30, 2012
Published:
January 30, 2012
Citation
Zheng, J., Shi, J., and Guo, W. (January 30, 2012). "Development of Nondestructive Test and Safety Assessment of Electrofusion Joints for Connecting Polyethylene Pipes." ASME. J. Pressure Vessel Technol. April 2012; 134(2): 021406. https://doi.org/10.1115/1.4004869
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