一、概述随着我国石油工业的飞速发展,油气管道逐年增加,用于输油管道防腐保温的新型结构不断出现,无疑是石油管道防腐保温工艺技术上的一次重大突破。目前,我国长输管道和集输油管网,已全面采用“泡沫夹克”新型防腐保温材料和工艺技术。它取代了过去多年来延续使用的煤沥青缠玻璃布落后的防腐保温体系和工艺技术,提供了输油管道不加热或少加热的流程,节省大量能源,减少建安工作量,并有显著的技术经济效益,深受有关部门的欢迎。我国各大油田从1985年开始已大量采用“泡沫夹克”防腐保温体系,约占全部油气管网的85％左右。目前我们所采用的成型工艺方法基本上分为二种:即“一步法”和“二步法”(或称管中管)。所谓“一步法”即是在同一工艺路线,进行一次投料生产“泡沫夹克”防 I. Overview With the rapid development of China’s oil industry, oil and gas pipelines have been increasing year by year. New structures for anticorrosion and thermal insulation of oil pipelines are emerging constantly. This is undoubtedly a major breakthrough in the anti-corrosion and heat preservation technology of petroleum pipelines. At present, China’s long-distance pipelines and pipeline networks have fully adopted the new foam jacket anti-corrosion insulation materials and technology. It replaces the coal-bitumen wrapped glass cloth that has been used for many years in the backward anti-corrosion and heat preservation system and technology, and provides a process of not heating or heating oil pipelines, saving a large amount of energy, reducing the workload of Jian’an, and having remarkable technical economy Benefit, welcomed by the relevant departments. Since 1985, China’s major oilfields have adopted a large amount of foam jacket anti-corrosion insulation system, accounting for about 85% of all oil and gas pipelines. At present, we use the molding process is basically divided into two types: the “one-step” and “two-step method” (or tube). The so-called “one-step” means that in the same process route, a production of “foam jacket” defense