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The technical requirements of this standard are equivalent to the oil and gas industry standards SY/T0447-96 "Epoxy Coal Tar Anti Corrosion Coating Technology for Buried Steel Pipelines" and SY/T0457-2000 "Epoxy Coating Internal Anti Corrosion Coating Technology for Steel Pipelines", and also comply with the requirements of the American Water Works Association AWWAC210-03 "Epoxy Coating Internal and External Anti Corrosion Coating for Steel Water Pipelines". It has the characteristics of corrosion resistance, high hardness, and fatigue resistance.
keyword Q/DH02 Category Anti-coating pipe standards Related products Get a quoteQ/DH02 Epoxy Anti corrosion Coating Anti corrosion Steel Pipe
Technical positioning of Q/DH02-2009 standard
Q/DH02-2009 is the enterprise standard for epoxy anti-corrosion coatings, which mainly specifies the technical indicators and production processes of anti-corrosion steel pipes. The technical requirements of this standard are equivalent to the oil and gas industry standards SY/T0447-96 "Epoxy Coal Tar Anti Corrosion Coating Technology for Buried Steel Pipelines" and SY/T0457-2000 "Epoxy Coating Internal Anti Corrosion Coating Technology for Steel Pipelines", and also comply with the requirements of the American Water Works Association AWWAC210-03 "Epoxy Coating Internal and External Anti Corrosion Coating for Steel Water Pipelines". It has the characteristics of corrosion resistance, high hardness, and fatigue resistance.
Core performance of anti-corrosion steel pipes
The anti-corrosion steel pipe produced based on Q/DH02-2009 adopts materials such as epoxy resin and coal tar asphalt, and forms a composite anti-corrosion layer through multi-layer coating process. For example, 3PE anti-corrosion steel pipes combined with epoxy powder bottom layer, adhesive intermediate layer, and polymer outer layer have impermeability, electrical insulation, and chemical corrosion resistance. The adhesion test of the coating shows that the adhesion of the epoxy coating reaches 1-3 levels, and the adhesion of the polymer coating is ≥ 30N/cm. The pipeline can be used stably for a long time in buried or underwater environments.
Application scenarios and construction requirements
This type of steel pipe is widely used in municipal drainage, oil and gas transportation, chemical thermal pipelines, and drinking water engineering. During construction, the surface of the steel pipe needs to be shot blasted or sandblasted to Sa2.5 level, and the humidity of the coating environment should be controlled (below 75%). Typical processes include the "two cloth, three oil" or "three cloth, four oil" structure, where epoxy coal tar and glass fiber cloth are alternately coated to enhance mechanical strength. Underground pipelines also require cathodic protection measures to extend their service life.
Collaboration with other standards
Q/DH02-2009 is highly compatible with various domestic and international standards, such as complying with GB50268-97 "Code for Construction and Acceptance of Water Supply and Drainage Pipeline Engineering" in the field of sewage treatment, and meeting the anti-corrosion requirements of ship coatings in marine engineering. The durability design of its thermoplastic coating enables the steel pipe to adapt to temperature differences ranging from -30 ℃ to 110 ℃, and the sealing performance is verified through a 5.05Mpa water pressure test.
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