Durability Evaluation of PE Pipe for Hot Water Application Under Various Test Conditions

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  • IGAWA Kazuhisa
    Residential Energy System Development Department, Osaka Gas Co., Ltd., Osaka, Japan
  • HONMA Hidekazu
    Analysis Research Center, KRI Inc., Ltd., Osaka, Japan
  • YAMADA Kazushi
    Advanced Fibro-Science, Kyoto Institute of Technology, Kyoto, Japan
  • NISHIMURA Hiroyuki
    Advanced Fibro-Science, Kyoto Institute of Technology, Kyoto, Japan

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  • 温水用PE管の各種試験条件における耐久性評価
  • オンスイヨウ PEカン ノ カクシュ シケン ジョウケン ニ オケル タイキュウセイ ヒョウカ

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Abstract

<p>This paper describes comparison of test results between the conventional hydrostatic stress rupture test and various accelerated durability tests considering the actual using condition using polyethylene pipes for heating and hot water supply containing a relative small amount of antioxidants which have low mobility in a resin. It was found that the dissolved oxygen in hot water and the diffusion factor of oxygen in a resin affect the degradation of a pipe. It was also clarified to the temperature dependence of oxidative degradation by the hot water circulation test and copper ion aqueous solution circulation test and to the mechanism of generation of thermal degradation by copper.</p>

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