Material of 3PP anti-corrosion pipelines
Release time:
2020-10-26
The choice of anti-corrosion materials for 3PP-coated pipelines is determined by the type of anti-corrosion coating used on the main pipeline. Repair methods include petroleum asphalt, polyethylene heat-shrinkable materials, and others. When the pipeline body has a three-layer PE composite structure, a three-layer PE heat-shrinkable coating should be selected.
3PP The materials for corrosion-resistant pipelines are determined based on the type of anti-corrosion coating used on the main pipeline. Repair methods include petroleum asphalt, polyethylene heat-shrinkable materials, and others. When the pipeline body consists of a three-layer structure, PE When using a composite structure, a three-layer design should be selected. PE Thermal shrinkage coating.
3PP Anti-corrosion pipelines can use epoxy powder and three-layer coatings. PE Heat-shrinkable joints. In addition, China’s anti-corrosion coatings for steel pipelines include petroleum asphalt, polyethylene jackets and polyethylene foam jackets, epoxy coal tar, epoxy powder and three-layer composite structures, epoxy coal tar cold-applied tapes, rubber-based cold wraps, and epoxy coal tar cold wraps.
Most widely used 3PP The pipeline’s anti-corrosion method consists of three layers. PE Composite structure. PF Type cold-wound winding, RPC Formed cold-wound coils. They are inexpensive and their quality is guaranteed, but they cause severe environmental pollution. 3PP Epoxy coal tar asphalt is easy to apply, but it has a long curing time and significant environmental impacts, making it unsuitable for on-site construction.
10℃ The following construction is difficult. 3PP Epoxy powder coatings for corrosion protection are applied using electrostatic spraying and fused with pipes made of the same material, ensuring strong adhesion. However, epoxy powders have relatively poor water resistance and can pose certain challenges to cathodic protection design. Moreover, the equipment is difficult to operate and control. 3PE Thermally shrinkable material for pipeline corrosion protection and sealing—stable quality, easy to install, and environmentally friendly.
3PP Polyethylene has low water absorption, high epoxy strength, and good softness when used as a hot-melt adhesive. It also offers high corrosion resistance. However, its cost is higher compared to other repair materials. PF Type and RPC The cold-coiled tape has a simple structure and is easy to operate. Three types of curing adhesives can enable... pf The epoxy coal tar cold-wrap tape is suitable for any environment, season, and temperature. It is particularly well-suited for pipelines with various primary anti-corrosion coatings, as well as for pipelines that already have the same primary anti-corrosion coating.
Second, some requirements are put forward for pipeline insulation. Petroleum is a highly complex mixture that can easily corrode pipelines. Therefore, it is essential to prevent corrosion. However, finished-oil pipelines also need to be insulated under anti-corrosion conditions. In the northeastern region, pipelines may freeze and crack due to thermal expansion and contraction. These are protective technologies designed to prevent pipeline corrosion caused by soil and the conveyed medium.
Most oil and gas pipelines are located in complex soil environments, and the media they carry are also corrosive; therefore, 3PP Both the inner and outer walls of pipelines can be subject to corrosion. Once a pipeline develops a corrosion-induced perforation, it can lead to oil and gas leaks, which not only disrupt transportation but also pollute the environment and even trigger fires.
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