The technical requirements for the anti-corrosion treatment of steel components during fabrication of pressure vessels like cryogenic stainless or carbon steel storage tanks, vaporators and oxygen generators are as follows:
1. After a steel surface is derusted, carry out anti-corrosion treatment immediately. Overnight anti-corrosion on derusted steel surface is prohibited, otherwise the derusting shall be undertaken again.
2. Outdoor anti-corrosion shall not be carried out in rainy, snowy and foggy days. The suitable anti-corrosion environment temperature should be 15-30 degrees.
3. The coating method, due to the large area of the siding, the roller coating method can be used for the intermediate coating and top coating on the site, and the profile steel and structural parts can be painted with a brush.
4. After the profile steel and structural parts are derusted, the primer and intermediate coats can be painted in sequence according to the design requirements. After installation, the anti-corrosion of profile steel and structural parts should be checked again. If local damage is found, derusting and anti-corrosion should be undertaken again for the damaged area.
5. During the storage and drying process, the anti-corrosion paint and thinner shall be kept away from acid, alkali, water, dust, direct sunlight, and fireworks.
6. When using the same paint for multi-layer painting, it is advisable to prepare different colors for different layers to avoid missing of any areas unpainted.
7. The selection of anti-corrosion paint and the thickness of the coating layers should be in accordance with the design requirements.
8. In the process of anti-corrosion painting, cooperate with the client or consulting engineers to check the number and quality of coating layers at any time.
9. After painting, the paint should have sufficient adhesion force and tinting strength. The surface should be smooth without marks, consistent in color, free from pinholes, bubbles, sagging, flaking, dew brushing, rusting, wrinkling, chalking and breakage.
10. When the design requires to measure the thickness, a magnetic thickness gauge can be used, and the thickness deviation is not less than 5% of the specified thickness to be qualified.
11. After the anti-corrosion coating is completed, it can be used after natural drying for more than 7 days and nights.
The technical requirements of pipes, pipes, anti-corrosion and heat insulation refer to Wanhua Enterprise Standard "Uniform Regulations for Pipelines" and "Uniform Regulations for Pipes".