Pipelines, as the transmission carriers of oil and gas, are one of the main facilities of surface projects. They serve as the link between upstream resources and downstream users. Since pipelines are buried underground for a long time, over time, factors such as external soil characteristics and terrain subsidence can cause pipelines to corrode, perforate, and leak, resulting in serious losses for fields and countries. The economic losses caused by pipeline corrosion due to construction can be divided into direct and indirect losses. Direct losses include: replacement equipment and component costs, repair costs, and anti-corrosion costs; Indirect losses include: production halt losses, loss of products caused by leaks in gas pipelines, losses caused by accumulation of corrosion products or corrosion damage. Indirect losses are much greater than direct losses and cannot be calculated. In addition to considering the serious economic losses caused by pipeline corrosion, it can also lead to harmful substance leaks, polluting the environment, and even causing sudden disasters, endangering personal safety. For long-distance pipelines and gathering and transportation networks that transport natural gas, the use of external anti-corrosion technology for pipelines and construction quality directly relate to the safe operation and service life of pipelines. Due to the complex terrain and varying soil properties of the regions the pipelines traverse, different external anti-corrosion methods need to be adopted for buried steel pipes. The development of key features in pipeline external anti-corrosion technology is reflected in high-performance, composite, long service life, and good economic performance of anti-corrosion materials.
The main types of adhesive tape products used for pipe anti-corrosion are polyethylene anti-corrosion tape, polypropylene fiber anti-corrosion tape, 660 type polyethylene anti-corrosion tape, and epoxy coal asphalt anti-corrosion cold-wrap tape. Among them, polyethylene anti-corrosion tape and polypropylene fiber anti-corrosion tape have the widest application scope and can fully meet various pipeline anti-corrosion projects. These tapes feature strong adhesion, good bonding with backing materials, excellent impact resistance, and compatibility with cathodic protection. They are widely used in some pipeline projects in North America, South America, and domestically.
Three-layer structure polyolefin (PE), developed and applied in Europe in the 1980s, combines the excellent anti-corrosion performance, adhesion, and high resistance to cathodic stripping of FBE with the high anti-permeability, good mechanical properties, and resistance to soil stress of polyolefin materials. Once introduced, it was utilized in many projects, especially in European countries, where its usage continues to grow. The bottom layer of three-layer PE is an epoxy coating, the middle layer is a polymer adhesive, and the outer layer is polyolefin. The adhesive can be modified polyolefin, which contains polar groups grafted onto the polyolefin carbon chain backbone. Thus, the adhesive can both fuse with unmodified polyolefin surfaces and react with epoxy resins through polar groups. This combination characteristic allows for optimal bonding strength among the three layers, while the performance and characteristics of each layer complement the three-layer coating. Its features include high cost and complex process. Company website: http://www.jsgkgs.cn Business hotline: 0515-88290219; 88229336; 15962080188.
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