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2004年,西气东输工程正式将管道天然气带入昆山地区,虽然起步晚,但天然气应用发展相当快,几年来用气量年年翻番,每年新增几十公里城市中压管线,聚乙烯管材由于耐腐蚀性强及安装方便,施工周期短、成本较低等优势,被普遍应用在设计压力不大于0.4MPa的城市中压天然气管网中。笔者从事公用天然气聚乙烯管线监检5年来,总结出以下几点体会。1焊接要点聚乙烯管材一般有热熔和电熔两种焊接方法。对于热熔焊接,除了要按焊接工艺正确设置吸热、冷却时间和加热温度等参数外,还应注意焊机
In 2004, the project of West-East Natural Gas Pipeline formally brought pipeline gas into Kunshan. Although it started late, the development of natural gas has been quite rapid. In recent years, the amount of gas used has doubled every year. Dozens of kilometers of urban medium-pressure pipelines and polyethylene pipes Due to its strong corrosion resistance, convenient installation, short construction period and low cost, it is widely used in urban medium-pressure natural gas pipelines with design pressure less than 0.4MPa. The author engaged in public natural gas polyethylene pipeline monitoring 5 years, summed up the following experience. 1 points of welding Polyethylene pipe generally have two methods of welding hot melt and fused. For hot melt welding, in addition to welding process according to the correct set heat absorption, cooling time and heating temperature and other parameters, but also should pay attention to the welding machine