Long-term coating process for metal surface of oil and gas equipment

Abstract

Disclosed is a novel long-acting coating technology of oil and gas equipment. The novel long-acting coating technology includes the steps that first, surface treatment is conducted, an angular finishing grinder is used for treatment at the positions which are simple in structure, a pneumatic type steel needle impacting brush is used for treatment at the positions of cracks and dead angles for connection of the equipment, and old paint films and oxidation substances on the surface of the equipment can be efficiently and reliably removed; second, ground coat paint is sprayed, before spraying, in the first place, the dead angles and cracks of the equipment have to be painted through a writing brush and a row of brushes, and the film thickness of the positions is made to meet design requirements; third, plastering and leveling are carried out; fourth, intermediate paint is sprayed, and the intermediate paint is sprayed in the way of executing the second step repeatedly; fifth, defects are found visually, and supplementary plastering and one more leveling are achieved; sixth, finish paint is sprayed, and the finish paint is sprayed in the way of executing the second step repeatedly. Repeated painting is conducted at the dead angles and cracks of the equipment by the adoption of the writing brush, the row of brushes and the like, a paint protective film can be formed, hence, potential quality hazards caused by leaky spaying of the dead angles and cracks of the equipment or poor spraying can be eradicated, and therefore the service life of the equipment is greatly prolonged.

Description

technical field [0001] The invention relates to the field of metal surface treatment and coating, in particular to a long-term coating process for the metal surface of outdoor oil and gas equipment that cannot be moved. Background technique [0002] During the exploitation and transportation of oil and gas, a large number of pipelines, gate valves, containers and other metal equipment with various functions are required. These equipment constitute many systems with complex structures and complete functions. And 80% of these systems are exposed to the outdoors and are subjected to the damage and rust of the natural environment (ultraviolet rays, acid-base media, rain). In order to protect these expensive equipment and System, regularly carry out qualified surface treatment on these equipment, and then spray anti-corrosion layer to achieve long-lasting and beautiful effect. The following six steps are adopted in the prior art: [0003] The first step: surface treatment (rust...

AI Technical Summary

Problems solved by technology

[0009] In general, the first step is to use an angle grinder to clean up the old paint film and rust caused by oxidation and corrosion, but this can only solve the problem of pipes and pipes with a simple structure that allows the angle grinder to have enough room for movement. The treatment of the surface of the container does not clean up the dead corners of many equipment such as gate valves and compressors (the industry standard is St2-St3); in special cases, sandblasting can be used to complete the first step of cleaning, but , although the sandblasting operation can solve the surface treatment problems of the dead corners and gaps of the equipment, it also causes serious pollution to the environment and produces a large amount of dust and waste, which greatly increases the cost of surface treatment

The third method is to use a chemical paint remover. After the paint remover sticks to the metal surface, it needs to be thoroughly cleaned to ensure that the new coating has good adhesion. The cleaning of dead corners is very difficult, and the cleaning quality Unreliable, but also high cost and chemical pollution

In the second step, the fourth step, and the sixth step, due to the inability to spray in place the dead corners and gaps of the equipment during the spraying process, the premature anti-rust of these parts cannot meet the design requirements of anti-corrosion construction, and these parts are often the connection of equipment. In this way, there are not only potential safety hazards caused by corrosion of important parts, but also the indicators of visual appearance cannot be met.