Painting process and precautions of cryogenic storage tank

When spraying paint on cryogenic storage tanks, pay attention to the surrounding environment. The ambient temperature for coating construction is not less than 5 degrees, and the relative humidity is not more than 85%. When rain, snow, fog, and wind are strong, outdoor construction is prohibited. If the surface of the pressure vessel is crystallized, construction is not allowed, so as not to affect the quality of the product. During the coating and drying process, the paint film is not exposed to the sun and the surface temperature of the coated part is not enough. It must not exceed 60 degrees. The construction area must be in the process of air circulation, painting, and drying of the paint film. It is forbidden to fly in the avatar and other foreign objects.

The cryogenic storage tank spraying process is as follows:
1. The pressure vessel should be strictly treated before painting so that the surface of the pressure vessel is free of oil, rust, oxide film, welding spatter, dust and other mechanical impurities.

2. Grinding method is used to remove the unevenness and scratches on the surface of the storage tank, and to ensure that the weld seam is uneven, uneven in thickness and rounded.

3. cryogenic storage tanks should be sprayed with a primer using high-pressure airless spray equipment or ordinary air spray guns. The sprayed primer is not allowed to have defects such as leaky spray, flow marks, wrinkled skin, uneven surface and surface; 4. After the primer of the storage tank is completely dried, use a cloth to roughen the surface of the primer first, and then use P240--P320 water-abrasive paper to finely polish the surface of the primer of the cryogenic storage tank until the surface is smooth and flat;

5. The pressure vessel uses a common air spray gun to spray the second primer, and the sprayed primer is not allowed to have defects such as leakage spray, flow marks, wrinkled skin, and uneven surface;

6. After the second primer of the storage tank is completely dried, the dry film thickness of the sprayed primer is measured by a special inspection instrument. The dry film thickness of the primer of the storage tank is not less than 30 μm, and then sprayed with a common air spray gun. Semi-gloss or non-gloss finish paint. The spray paint is not allowed to have defects such as leakage spray, sagging, air bubbles, cracks, wrinkles, uneven surface, and peeling, etc. Otherwise, it should be repaired; the top coat after spraying should be It is uniform and firm. If necessary, the thickness of the coating of the cryogenic storage tank can be detected by a special inspection instrument.