金属管道通过外防腐涂层减蚀增效。随着油气工业的不断发展，一些早年铺设的埋地管道外涂层会逐渐变质老化，每年将有数万公里的旧管道需要涂层更新，使管道维护和检测日趋重要。近年来，国外在旧管道外涂层更新方面已经取得了明显的效果，其中旧管道修复机构研究出管道外涂层的失效机理，针对多年埋地管道外涂层状况而研制出相应的旧涂层检测设备，准确地确定了管道外涂层损坏的程度，同时为一系列旧涂层整修计划做好了充分的准备。目前，国外已对年久失修的各种口径埋地管道的外涂层进行几年的更新工作，并开发出一系列修复设备（包括超高压水清除涂层设备和机械刮削式清除涂层设备）、表面预制（如喷砂法）、沿管道自动行走喷涂设备和胶带缠绕设备等均采用了计算机控制，使旧涂层更新水平日趋成熟，成套的旧管道外涂层设备不仅更新旧涂层质量高，而且也延长了埋地管道的使用年限，提高了企业的经济效益。 Metal pipe corrosion through anti-corrosion coating efficiency. As the oil and gas industry continues to evolve, some of the buried pipeline coatings that were laid in the early years will gradually deteriorate and age. Tens of thousands of kilometers of old pipelines will require coating renewal each year, which will make pipeline maintenance and testing increasingly important. In recent years, foreign countries in the old pipeline coating renewal has made obvious effects, in which the old pipeline repair agencies to study the failure mechanism of the pipeline coating, according to many years of buried pipeline coating conditions and the development of the corresponding old coating Layer inspection equipment accurately determines the extent of damage to the outer coating of the pipe and is well prepared for a range of old coating refurbishment programs. At present, foreign countries have been on the disrepair of various caliber buried pipe coating for several years of renewal and development of a series of repair equipment (including ultra-high pressure water removal coating equipment and mechanical scraper removal coating equipment ), Surface prefabrication (such as sand blasting), along the pipeline automatic walking spraying equipment and tape winding equipment are used computer control, so that the level of the old coating matures, the complete set of old pipe coating equipment not only renew the old coating High quality, but also extend the useful life of buried pipelines and improve the economic efficiency of enterprises.