How to carry out anti-corrosion design for the steel structure of petrochemical production equipment after maintenance?

This post was last edited by Zhongyuan people at 2020-6-26 05:40: Do whatever you want. 1. For steel structures: Sand and remove rust. Check the unusable steel gratings and pattern plates, clean them out and replace them, polish and remove rust that can be retained, and then re-spray primer, intermediate paint, and topcoat according to the spraying requirements. 2. For reinforced concrete structures: Re-patch and reinforce, and apply anti-corrosion paint on the exterior. 3. Carefully conduct internal and external inspections of process pipelines and equipment, re-polishing and removing rust from the appearance, and then spray primer, intermediate paint and topcoat according to spraying requirements. ； If you need to repair thermal insulation or cold insulation, you need to keep up with the steps.

Cleaning up, putting on makeup, it’s another modern factory, haha. It is recommended to sort out according to the risk analysis method and replace what needs to be replaced! No safety hazards can be left behind! ! There is a big gap between the design concepts of old factories and modern chemicals, such as earthquake resistance, fire resistance, and spacing. . .

According to the service environment and purpose of the steel structure, the anti-corrosion of steel structures is divided into general anti-corrosion and heavy anti-corrosion. At the same time, reinforcement measures are taken for seriously damaged load-bearing components. For stairs, railings, platforms, guards, chutes, pipes, etc., the corrosion in their environment is relatively weak, the threat to coating failure is weak, and the vibration force is light. A general anti-corrosion plan of sandblasting and rust removal + anti-corrosion coating is adopted, and the total thickness of the anti-corrosion layer is controlled at 250~320 μm. For important load-bearing or key protection parts such as beams, longitudinal beams, columns, and trusses of the modular steel structure, a heavy-duty anti-corrosion plan of sandblasting and rust removal + thermal spraying + anti-corrosion coating is adopted, and the total anti-corrosion thickness is controlled at 300~360 μm. For pipeline anti-corrosion, it is necessary to fully understand its use environment and operating parameters. If necessary, it should be tested and anti-corrosion and temperature-resistant treatments should be carried out. Seriously damaged steel columns, steel beams and other load-bearing parts need to be replaced in time or corresponding reinforcement measures must be taken. In short, the corrosion environment of industrial equipment is complex and requires on-site investigation and detailed analysis of specific problems to provide reasonable anti-corrosion technical solutions.

The rest is coating selection and matching. If necessary, we can continue to communicate: handshake

Anti-corrosion in petrochemical enterprises is urgent. If it can be solved, it will* * and save a lot of losses and waste in the industry.

The material selection is based on the previously used coatings, which are not only highly breathable and water-permeable in terms of molecular structure, but also dry at room temperature during construction, and the solvent evaporates slowly. At this time, impurities such as dust in the environment are easily mixed in, causing more pinholes in the paint layer. In addition, conventional oily materials are not resistant to aging and are not resistant to acid, alkali and solvent erosion. It hardly dries at low temperatures, and its gloss and hardness are not as good as resin paint. Therefore, choosing the anti-aging properties, impermeability, acid and alkali resistance, solvent resistance and gloss retention of the paint film is a better way to extend the service life of the coating. The principles for coating selection, construction and acceptance are required to refer to the international standard "ISO 12944 Paints and Varnishes - Protection of Steel Structures by Protective Coating Systems", and implement the "SH 3022-1999 Technical Specifications for Anti-corrosion Coatings for Petrochemical Equipment and Pipelines" and "SHT3603-2009 Technical Specifications for the Application of Anti-Corrosion Coatings on Petrochemical Steel Structures". Among them ISO12944-2:2017. Considering that the environment where the production equipment is located is relatively corrosive, coatings can be selected according to the very high corrosion level of C5. The anti-corrosion coating is designed to be above 300 microns. Choose acrylic urethane paint or fluorocarbon topcoat paint ； The construction requirements of the two coatings are basically the same ； However, the performance of fluorocarbon paint is superior, but the price is higher. Acrylic polyurethane coatings are commonly used products in petroleum and petrochemical industries. Both paints feature an acrylic urethane topcoat. Because acrylic polyurethane does not absorb ultraviolet light and sunlight above 300nm, the coating composed of hydroxyl acrylic resin and aliphatic isocyanate cross-linking agent has excellent weather resistance, light resistance, good color retention, plump paint film, strong impact resistance, and excellent elasticity. Using acrylic resin, solvent, color filler and additives to form component A, and aliphatic isocyanate as component B, a coating with excellent weather resistance and anti-corrosion properties can be obtained. This kind of paint has been used on metal surfaces in chemical atmospheres for more than 8 years. The coating is still intact, while the chlorosulfonated rubber coating constructed during the same period has been powdered and peeled off. Fluorocarbon anticorrosive coatings are coatings that use organic fluorocarbon polymers or organic fluorine modified polymers as the main film-forming substance. Their main features are excellent weather resistance, chemical resistance, corrosion resistance, abrasion resistance, and stain resistance. Note that the selection of materials is very important and the quality of construction is very important.