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一、概 述 管道的内壁涂层始于国外(美国等),其最初是作为防止管道的内壁腐蚀而提出来的。1947～1948年,内涂层第一次应用于含硫原油管道和含硫天然气管道,1953年第一次应用于干线输气。以后发现,内涂层不仅是防止管道内腐蚀的有效办法,而且还是提高管道输量的有效手段,特别是对于干线输气管道。根据文献介绍,国外的输气管道使用内涂层后,可使输气量增加5～20％。因此,自六十年代以来,内涂层有了更快的发展。目前,许多国家都已普遍使用内涂层,有些国家甚至规定:不采用内涂层的新输气管道不准投产(特殊情况除外)。各国输气管道使用内涂层的情况如表1。
First, an overview of the pipeline wall coating began in foreign countries (the United States, etc.), which was originally proposed as a way to prevent corrosion of the pipe wall. From 1947 to 1948, the inner coating was first applied to sulfur-bearing crude oil pipe and sulfur-containing natural gas pipelines, and was first applied to main gas pipeline in 1953. Later found that the inner coating is not only an effective way to prevent corrosion within the pipeline, but also to improve the effective means of pipeline traffic, especially for the trunk gas pipeline. According to the literature, after the inner coating is used in gas pipelines in foreign countries, the gas transmission capacity can be increased by 5% to 20%. Therefore, the inner coating has developed even faster since the 1960s. At present, the internal coating is commonly used in many countries. Some countries even stipulate that new gas pipelines that do not use an internal coating should not be put into production (except in special cases). Domestic gas pipelines within the coating as shown in Table 1.