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Current status and future of pipeline anticorrosion structure

Time:2020/5/8 posted:Kehong Enterprises Co.,Ltd.

   At the beginning of the 20th century, pipelines used anti-corrosion materials mainly based on petroleum asphalt. In the 1990s, the number of anticorrosion layers using polyethylene structure in the world was almost the same as epoxy powder and coal tar enamel. At the turn of the century, the three-layer PE structure and epoxy powder dominated. At present, the anti-corrosion structure of domestic long-distance pipeline construction is mainly composed of three-layer PE structure, and partly adopts epoxy powder anti-corrosion structure.


   (1) Three-layer PE structure and epoxy powder anti-corrosion layer


China's three-layer PE structure anti-corrosion layer and epoxy powder anti-corrosion layer were introduced from abroad in the 1990s and have been widely used. The so-called three-layer PE structure refers to the outer surface of the steel pipe that is heated after surface cleaning and rust removal, and is formed by epoxy powder spraying and adhesive / PE winding; the epoxy powder anti-corrosion layer refers to the outer surface of the steel pipe. After cleaning and derusting, heating is carried out, and the anticorrosive layer is formed after spraying with epoxy powder. At present, most of the domestic anti-corrosion plants are set up in steel pipe plants. After the steel pipes are manufactured, they enter the anti-corrosion plant for anti-corrosion operations. The anti-corrosion structure at the welding joint is also made of 3PE anti-corrosion structure, commonly used are 3PE heat shrinkable tape and 3PE heat shrinkable sleeve.


   (2) Internal drag reduction coating


China's internal drag reduction coating technology was developed on a large scale at the end of the 20th century. It is mainly used in the pipeline gas transportation process, which can achieve the purposes of reducing friction, increasing pipeline transportation, and reducing the overall cost of pipeline operation. The main process is to clean the inner surface of the pipeline, through the rotation of the steel pipe, spray the epoxy coating on the inner surface of the steel pipe through the high-pressure airless spray gun, so that the inner surface of the steel pipe forms a high-quality, continuous and smooth effective coating. The coating operation line in the pipeline is mainly composed of a preheating system, an internal derusting system, an internal spraying system, and a coating curing system.


    With the progress and development of long-distance pipeline technology, pipeline anti-corrosion technology is also progressing and developing, and new anti-corrosion processes and new materials are constantly being researched.

管道防腐层结构的现状与未来

  20世纪初,管道采用以石油沥青为主的防腐材料。20世纪90年代,国际上采用聚乙烯结构防腐层与环氧粉末、煤焦油瓷漆等的数量基本差不多。世纪之交时,三层PE结构与环氧粉末占据了主导地位。目前,国内长输管道建设的防腐结构,以三层PE结构为主,部分采用环氧粉末防腐结构。


  (1)三层PE结构与环氧粉末防腐层


我国的三层PE结构防腐层与环氧粉末防腐层是20世纪90年代从国外引进的,并得到了广泛应用。所谓三层PE结构是指钢管的外部通过表面清理与除锈后进行加热,经环氧粉末喷涂、胶黏剂/PE缠绕后形成的防腐层;环氧粉末防腐层是指钢管的外部通过表面清理与除锈后进行加热,经环氧粉末喷涂后形成的防腐层。目前,国内的防腐厂大部分都在钢管厂设立,钢管制造完成后,即进入防腐厂进行防腐作业。在焊口处的防腐结构也是采用3PE防腐结构,常用的是3PE热缩带和3PE热缩套。


  (2)内减阻涂层


我国的内减阻涂层技术是20世纪末期开始进行大规模研制的,主要用于管道输送气体过程,可达到降低摩阻、增加管输量、降低管道运行综合成本的目的。其主要工艺是在清理干净的管道内表面,通过钢管的旋转,将环氧涂料通过高压无气的喷枪喷涂在钢管的内表面,使钢管内表面形成高质量、连续光滑的有效涂层。管道内涂敷作业线主要由预热系统、内除锈系统、内喷涂系统、涂层固化系统组成。


   随着长输管道技术的进步与发展,管道防腐技术也在进步与发展,新的防腐工艺及新材料也在不断地被研究出来。



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