Product classification
2PP/3PP anti-corrosion steel pipe
The anti-corrosion method of anti-corrosion steel pipes is generally to use coatings for anti-corrosion, which are mainly used for the protection of solid metal surfaces and occasionally also applicable to non-metallic materials. Coating corrosion prevention is one of the basic methods for steel pipe corrosion prevention, which involves uniformly and densely coating a rusted metal pipeline surface with a coating to isolate it from various corrosive media.
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The anti-corrosion method of anti-corrosion steel pipes is generally to use coatings for anti-corrosion, which are mainly used for the protection of solid metal surfaces and occasionally also applicable to non-metallic materials. Coating corrosion prevention is one of the basic methods for steel pipe corrosion prevention, which involves uniformly and densely coating a rusted metal pipeline surface with a coating to isolate it from various corrosive media.
At present, there is no industry standard for 3PP coating in China, and the processed 3PP anti-corrosion pipelines generally use the German DIN30678 "Polypropylene Coating for Steel Pipelines" standard. 3PP coating is mainly used for anti-corrosion pipelines transporting high-temperature media and as an anti-corrosion layer for pipelines in desert areas with high surface temperature and long sunshine time. Therefore, it has been increasingly widely used on buried water, gas, and oil pipelines in areas with high surface temperature and long sunshine time.
Product specifications: Ф 89mm- Ф 1820mm, wall thickness 6mm-20mm.
Materials: Q235B, Q345B, 10 # steel, 20 # steel, X42-X80 grade, etc.
Usage: The product is widely used in oil pipelines, natural gas pipelines, heating pipelines, and water supply pipelines.
Executive standard: DIN30678 Technical standard for polypropylene coatings on steel pipes and fittings
The anti-corrosion method of anti-corrosion steel pipes is generally to use coatings for anti-corrosion, which are mainly used for the protection of solid metal surfaces and occasionally also applicable to non-metallic materials.
Coating corrosion prevention is one of the basic methods for steel pipe corrosion prevention, which involves uniformly and densely coating a rusted metal pipeline surface with a coating to isolate it from various corrosive media.
When selecting an appropriate anti-corrosion system, we must consider the corrosive environment in which the protected assets are located, such as pipelines, buildings, vehicles, ships, bridges, equipment, buildings, and tunnels that exist underground in urban or rural areas; In addition, materials exposed to air, ocean, mining, or industrial environments are also affected by corrosion. However, the selected coating must be compatible with the substrate material, composition, and environment in which the material is used. Let's take a look at the main corrosion factors that professional pipeline anti-corrosion manufacturers need to consider.
1. Anti corrosion coating on the outer wall: Types and usage conditions of coating materials for the outer wall of pipelines.
2. Inner wall anti-corrosion coating: A thin film applied to the inner wall of a pipe to prevent corrosion, reduce friction resistance, and increase throughput. The commonly used coatings include amine cured epoxy resin and polyamide epoxy resin, with a coating thickness of 0.038-0.2 millimeters. To ensure strong adhesion between the coating and the pipe wall, surface treatment must be carried out on the inner wall of the pipe. Since the 1970s, there has been a trend towards using the same materials for coating the inner and outer walls of pipes, in order to facilitate simultaneous coating of the inner and outer walls.
3. Anti corrosion and insulation coating: In medium and small diameter hot oil or fuel oil pipelines, a composite layer of insulation and anti-corrosion is added to the outside of the pipeline to reduce heat dissipation to the soil. The commonly used thermal insulation material is rigid polyurethane foam plastic, and the applicable temperature is -185~95 ℃. This material has a soft texture, and to improve its strength, a layer of high-density polyethylene is added outside the insulation layer to form a composite material structure to prevent groundwater from infiltrating the insulation layer.
4. If the outer protective pipe is made of polyethylene, there is no need to apply anti-corrosion measures again
Polyethylene is odorless, non-toxic, and feels like wax to the touch. It has excellent low-temperature resistance (up to -70~-100 ℃ at low temperatures), good chemical stability, and can withstand most acids and bases (not oxidizing acids). It is insoluble in general solvents at room temperature and has low water absorption. However, due to its linear nature, it can slowly dissolve in certain organic solvents without swelling, and has excellent electrical insulation performance.
5. General recommendations for coating selection
For coatings that are resistant to acid, alkali, or salt, polyurethane, coal tar epoxy paint, and chlorinated rubber coatings can be selected.
For coatings that are resistant to solvents, inorganic zinc rich coatings, polyurethane or chlorinated rubber coatings can be selected.
For coatings used in oxidizing environments, vinyl and polyurethane, or inorganic zinc rich coatings can be chosen.
Generally speaking, metals working in high-temperature environments should avoid using polymer coatings on them.
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Main business: American standard oil casing, pipeline pipe, Cangzhou oil casing, API oil casing, Hebei oil casing, polyurethane insulation pipe, galvanized wire steel pipe, 3PE anti-corrosion steel pipe, thickened oil pipe, large diameter oil casing, oil casing factory, insulation pipe, oil casing, anti-corrosion steel pipe, etc.
Address: Zhenggang Development Zone, Yanshan County, Hebei Province
Email:czbggy@163.com
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