The basic method of rust removal of high pressure boiler steel pipe:
(1) Cleaning: Use solvents and emulsions to clean the surface of high-pressure boiler steel pipes to remove oil, grease, dust, lubricants and similar organic substances, but it cannot remove rust, oxide skin, welding flux, etc. on the surface of high-pressure boiler steel pipes.
Therefore, it is only used as an auxiliary means in anti-corrosion production.
(2) Derusting with tools: mainly use tools such as wire brushes to polish the surface of high-pressure boiler steel pipes, which can remove loose or raised oxide scale, rust, welding slag, etc. The rust removal of hand tools can reach Sa2 level, and the rust removal of power tools can reach Sa2 level.
Reaching the Sa3 level, if the surface of the high-pressure boiler steel pipe is adhered to a firm iron oxide scale, the rust removal effect of the tool is not ideal, and the anchor pattern depth required by the anti-corrosion construction cannot be reached.
(3) Pickling: Generally, two methods of chemical and electrolytic pickling are used for pickling, and only chemical pickling is used for pipeline anticorrosion, which can remove oxide scale, rust, and old coatings, and can sometimes be used as reprocessing after sandblasting and rust removal . chemical cleaning
Although the surface can achieve a certain degree of cleanliness and roughness, the anchor pattern is shallow, and it is easy to cause pollution to the environment.
(4) Spray (throwing) rust removal: Spray (throwing) rust removal is driven by a high-power motor to drive the spray (throwing) blade to rotate at a high speed, so that abrasives such as steel sand, steel shot, iron wire, and minerals are affected by centrifugal force. Spray the surface of the steel pipe
The (throwing) treatment can not only completely remove rust, oxides and dirt, but also achieve the required uniform roughness under the action of the violent impact and friction of the abrasive.
After spraying (throwing) rust removal, it can not only expand the physical adsorption of the surface of the pipe, but also enhance the mechanical adhesion between the anti-corrosion layer and the surface of the pipe. Therefore, spraying (throwing) rust removal is an ideal rust removal method for pipeline anticorrosion.
Generally speaking, shot blasting (sand) derusting is mainly used for inner surface treatment of high-pressure boiler steel pipes, and shot blasting (sand) derusting is mainly used for outer surface treatment of pipes. Several problems should be paid attention to when using spray (throwing) rust removal.
With the current development of my country’s economy, long-distance oil and gas pipelines are an important way of energy security. During the anti-corrosion construction of oil (gas) pipelines, the surface rust removal of high-pressure boiler steel pipes also leads to their service life factors. make sure
On the basis of the same equipment, the quality of the anti-corrosion layer is greatly improved, and the production cost is greatly reduced.