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PE燃气管烧熔漏气案例失效原因及热影响区结构性能退化研究
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Abstract:
本文采用宏观/微观形貌、傅里叶红外光谱、差示扫描量热法(DSC)和热失重法等对城市管网中烧熔失效的PE燃气管的表观性能和结构老化性能与未服役管材进行了比较分析，阐明了烧熔PE燃气管失效漏气的本质原因。烧熔管材在服役过程中已经发生了结构劣化，性能下降；但烧熔区域由于高温氧化发生小分子链的再结晶，结晶度、熔融温度和耐热氧老化性能相对提高；未烧熔区域受到烧熔区的影响，性能明显下降；提出应重点关注结构严重劣化的PE燃气管烧熔热影响区的范围。
This paper presents a comparative analysis of the apparent and structural aging properties of polyethylene gas pipe which was hot-melting and failure in urban networks and unused pipes, using macro/microscopic morphology, Fourier transform infrared spectroscopy, differential scanning calorimetry (DSC) and thermal weight loss, to clarify the essential causes of failure and gas leakage of PE gas pipes. The ablative pipe has structural deterioration and performance degradation taken place during the service. However, the crystallinity, melting temperature and thermal oxygen ageing properties of the ablative polymer area were relatively improved due to the recrystallisation of short chains polymer as a result of high temperature oxidation behavior. The performance of the vicinity of ablative area was significantly reduced affected by thermal ablation diffusion. It was proposed that the focus should also be put on the extent of the ablation heat-affected zone where the pipe was severe structural deterioration.
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