Abstract
Abstract Polyethylene (PE) pipelines have been widely used as a substitute for steel pipelines in urban natural gas transportation around the world, due to their corrosion resistance, low cost, and good construction performance. As a kind of non-metallic material, PE pipelines age while being used. Currently, the aging status of PE pipelines is not clear and a reliable method to evaluate the aging life of them is necessary to be deeply explored. Due to the different contact with oxygen while using, the aging conditions of the outer, middle, and inner layers are also various. According to the research in this work, the aged PE80 pipelines in accelerated aging experiments were divided into three layers including outer, middle, and inner layers. The aging performance of the three layers has great differences. A comprehensive method for the aging properties of PE80 pipelines should be established while evaluating PE pipelines in service.
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