The anti-corrosion layers of steel pipelines that are widely used in China include petroleum asphalt, PE jacket and PE foam jacket, epoxy coal asphalt, coal tar enamel, epoxy powder and three-layer composite structure, epoxy coal asphalt cold-wrapped tape (PF type), rubber-plastic epoxy coal pitch cold-wrapped tape (RPC type), etc. The most widely used pipeline anti-corrosion methods at present are three-layer PE composite structure, single-layer powder epoxy, PF type cold-wrapped tape, and RPC type cold-wrapped tape Tape.
Petroleum asphalt has a wide range of raw materials and low prices. However, the working conditions are poor, quality is difficult to guarantee, and environmental pollution is serious.
Epoxy coal pitch is easy to operate, but the covering layer takes a long time to cure and is greatly affected by the environment. It is not suitable for field operations and is difficult to construct below 10°C.
Epoxy powder anti-corrosion uses electrostatic spraying. It fuses well with the anti-corrosion pipe body of the same material and has strong adhesion. However, the epoxy powder has poor waterproofing (water absorption rate is high, reaching 0.83%), so it is designed for cathodic protection. bring certain difficulties. On-site equipment requirements are high, operation is difficult, and quality is difficult to control.
3PE heat shrink material has strong anti-corrosion and sealing properties for pipelines, high mechanical strength, strong waterproofing, stable quality, convenient construction, good applicability, and does not pollute the environment. PE has low water absorption (less than 0.01%), high epoxy strength, low PE water absorption, and good hot melt adhesive softness, etc. It has high anti-corrosion reliability. The disadvantage is that compared with the cost of other repairing materials, costly.
The construction of PF type and RPC type cold-wrapped tape is simple and easy. The three matching fixing glues enable the PF type epoxy coal pitch cold-wound tape to be constructed in any environment, any season, and any temperature condition.
The characteristics of cold-wrapped tape and 3PE heat shrink tape are: they are suitable for main anti-corrosion layer pipes of various materials, while other methods are suitable for main anti-corrosion layer pipes of the same or close materials.
Post time: Dec-19-2023