Technical requirements for pipeline anti-corrosion construction

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Technical requirements for pipeline anti-corrosion construction I. Surface treatment: All steel pipes and steel pipe fittings must undergo surface treatment. Before carrying out anti-corrosion work, the inner and outer surfaces of the steel pipes must be rust-removed; any residual rust, iron oxide, dirt, slag, etc. on the surface must be completely removed, with the rust removal level reaching St3 standard. II. Materials Used and Anti-corrosion Structure: For internal anti-corrosion treatment of steel pipes, anti-corrosion materials that have been approved by the Health Ministry are used, namely IPN8710-2 coating for drinking water equipment (whose health and safety requirements comply with those specified in GB/T17219-1998). The coating structure consists of a primer, another primer, a topcoat, and yet another topcoat, with a thickness of 150 microns ± 10 microns ； External anti-corrosion coating for buried steel pipes: IPN8710—1, a new type of polymer-based anti-corrosion coating (primer) is used ； The IPN8710-3 thick-coat anti-corrosion coating (topcoat) is used; its structure consists of a primer – glass fiber cloth – primer – glass fiber cloth – two layers of topcoat. The required thickness is not less than 500 microns ± 20 microns, and a voltage test of 5000 V is carried out. External anti-corrosion treatment for Minglu steel pipes: A weather-resistant and color-preserving anti-corrosion coating with strong UV resistance, such as IPN8710-4, can be used. The anti-corrosion structure consists of primer – primer – topcoat – topcoat, with a thickness of 180 microns ± 10 microns. Anti-corrosion coatings for inside and outside of pipelines: \"Hengchang Brand\" produced by Zhangjiagang Hengchang Health Technology Co., Ltd ； IPN8710—1: New type of polymer-based anti-corrosion coating; IPN8710—2: Coating for drinking water equipment; IPN8710—3: Thick-slurry type anti-corrosion coating; IPN8710—4: Weather-resistant, color-preserving anti-corrosion coating. Precautions for anti-corrosion treatment: (1) When using the IPN8710 series of anti-corrosion coatings, it is necessary to remove oil, dust, welding slag, and other contaminants from the metal surface before applying the coating; the surface of the component to be protected must be dry and free of moisture. (2) During anti-corrosion coating, the next coat can only be applied after the previous coat has fully dried. (3) To ensure the thickness of the paint film at the weld area, apply two coats to that area first, and then apply the anti-corrosion paint throughout. (4) After application, the surface should be smooth, free from sagging, wrinkling, brush marks, exposed underlying material, or cracking, and the coating should be even. (5) Leave 100 mm uncoated on each side of the weld at the installation site; painting shall be applied as required after the installation is completed. (6) During transportation and lifting, the pipeline should be prevented from coming into hard friction with foreign objects to avoid damage; if damage occurs, it must be repaired until it is in good condition. (7) Outdoor construction shall not be carried out in rainy or foggy weather. (8) When working in areas with poor ventilation, artificial ventilation facilities should be used. In the comments, everyone can add information to clarify any incorrect or missing parts of the article, so that those who read it next will learn more. What you know is exactly what everyone needs.