The failure mechanism of field polyethylene gas pipeline with gas leakage at electrofusion joint

IF 2.3 4区 材料科学 Q2 METALLURGY & METALLURGICAL ENGINEERING
Qing Bao, Baojin Wang, Manman Li, Chao Li, Jin Gao
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Abstract

Purpose

A section of in-service PE gas pipeline in Guocun, Beijing, was found to appear gas leaking at the electrofusion (EF) joint. This study is dedicated to reveal the material cause of EF joint failure to help with a more accurate prediction of service life of PE gas pipe and further normalize the construction of PE gas pipeline.

Design/methodology/approach

Defect detection was carried out on the leaking EF joint using ultrasonic phased array. The mechanical degradation and structural aging behavior was studied by tension test, FTIR technology, TG test and DSC test. The organic components in the soil surrounding the PE gas pipe failure area were qualitatively identified.

Findings

The results showed that the organic surfactants in the soil environment could accelerate the aging behavior of PE material, leading to a deterioration of mechanical properties and a serious reduction in the ability of the PE pipe and EF joint, especially at the welding defect, to resist external force.

Originality/value

A novel study was conducted to investigate the failure cause of the EF joint of in-service PE gas pipe, incorporating the analysis of environmental factors and structural deterioration.

电熔接头处气体泄漏的现场聚乙烯燃气管道的失效机理
目的 在北京郭村的一段在役聚乙烯燃气管道上发现电熔(EF)接头处有气体泄漏。本研究致力于揭示电熔接头失效的材料原因,以帮助更准确地预测聚乙烯燃气管道的使用寿命,并进一步规范聚乙烯燃气管道的施工。通过拉伸试验、傅立叶变换红外技术、TG 试验和 DSC 试验研究了机械降解和结构老化行为。结果表明,土壤环境中的有机表面活性剂会加速聚乙烯材料的老化行为,导致聚乙烯管材和 EF 接头(尤其是焊接缺陷处)的机械性能恶化,抵抗外力的能力严重下降。
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来源期刊
Anti-corrosion Methods and Materials
Anti-corrosion Methods and Materials 工程技术-冶金工程
CiteScore
2.80
自引率
16.70%
发文量
61
审稿时长
13.5 months
期刊介绍: Anti-Corrosion Methods and Materials publishes a broad coverage of the materials and techniques employed in corrosion prevention. Coverage is essentially of a practical nature and designed to be of material benefit to those working in the field. Proven applications are covered together with company news and new product information. Anti-Corrosion Methods and Materials now also includes research articles that reflect the most interesting and strategically important research and development activities from around the world. Every year, industry pays a massive and rising cost for its corrosion problems. Research and development into new materials, processes and initiatives to combat this loss is increasing, and new findings are constantly coming to light which can help to beat corrosion problems throughout industry. This journal uniquely focuses on these exciting developments to make essential reading for anyone aiming to regain profits lost through corrosion difficulties. • New methods, materials and software • New developments in research and industry • Stainless steels • Protection of structural steelwork • Industry update, conference news, dates and events • Environmental issues • Health & safety, including EC regulations • Corrosion monitoring and plant health assessment • The latest equipment and processes • Corrosion cost and corrosion risk management.
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