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SY/T0457 is a technical standard for the internal anti-corrosion coating of liquid epoxy coatings for steel pipelines in the petroleum and natural gas industry. The version is SY/T0457-2019, which was released in 2019 and replaced the 2010 version.
keyword SY/T 0457 Category Anti-coating pipe standards Related products Get a quoteSY/T 0457 Liquid Epoxy Coating Internal Anti Corrosion Steel Pipe
SY/T0457 Technical Specification for Anti corrosion Steel Pipe
SY/T0457 is a technical standard for the internal anti-corrosion coating of liquid epoxy coatings for steel pipelines in the petroleum and natural gas industry. The version is SY/T0457-2019, which was released in 2019 and replaced the 2010 version. This standard specifies the design, application, construction, and inspection requirements for the internal anti-corrosion layer of liquid epoxy coatings, applicable to steel pipes transporting crude oil, natural gas, and industrial water, with a medium temperature not exceeding 80 ℃. The anti-corrosion coating is divided into ordinary grade (≥ 200 μ m), reinforced grade (≥ 300 μ m), and extra reinforced grade (≥ 450 μ m), and the specific grade needs to be determined based on factors such as the corrosiveness of the medium and operating temperature.
Application Fields and Material Characteristics
SY/T0457 anti-corrosion steel pipes are widely used in urban water supply, fire protection pipelines, industrial circulating water, and oil and gas transportation. Its core advantage lies in the combination of the mechanical strength of steel pipes and the corrosion resistance of plastic coatings. For example, water supply coated plastic steel pipes are coated with modified epoxy resin, which has the characteristics of acid and alkali resistance, microbial erosion resistance, and no scaling, ensuring safe water quality. In addition, IPN8710 coating is specifically designed for drinking water pipelines, meets hygiene standards, and is suitable for water supply, drainage, and chemical fluid transportation.
Production process and construction requirements
The production of anti-corrosion steel pipes requires strict surface treatment, including spray rust removal to Sa2.5 level, anchor depth of 35-75 μ m, and the use of airless spraying or centrifugal coating processes. During construction, it is necessary to control the environmental humidity (below 85%) and temperature (above 3 ℃ above the dew point), and it is prohibited to work under conditions of rain, snow, and sandstorms. Liquid epoxy coating is a two-component system that forms an interpenetrating network structure through chemical reactions, with strong adhesion and excellent chemical corrosion resistance.
Quality Inspection and Standard Reference
SY/T0457-2019 requires inspection of the appearance, thickness, and leakage points of the anti-corrosion coating, and evaluates the surface cleanliness by referencing standards such as GB/T18570.3. Coated steel pipes also need to comply with industry standards such as CJ/T120-2008 for their pressure resistance, impact resistance, and hygiene performance. For example, plastic coated steel pipes for water supply need to undergo bending tests to verify that the coating does not peel off or break, and that long-term use does not release harmful substances.
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