The basic ways of high-pressure boiler steel pipe derusting

The basic ways of high-pressure boiler steel pipe derusting:

 1  cleaning: use solvent, emulsion high-pressure boiler steel pipe surface cleaning, to remove oil, grease, dirt, lubricants, and similar organic matter, but it cannot remove high-pressure boiler steel pipe surface rust, scale, welding flux, etc., therefore in the production of anti-corrosion only as a supplementary means.

[2] tool cleaning: mainly USES steel wire brush and other tools of high-pressure boiler steel pipe surface grinding, can remove loose or cock scale, rust, slag, etc. Hand tools can achieve derusting Sa2 level, power tool cleaning can reach grade Sa3, if a high-pressure boiler steel pipe firmly adhered on the surface of iron oxide, tool cleaning effect is not ideal, anchor pattern depth of anticorrosion construction requirements

[3] pickling: generally do with two methods of chemical and electrolytic pickling process, pipeline corrosion protection using chemical pickling, can remove scale, rust, old coating, sometimes can be used as sandblasting derusting after reprocessing. Chemical cleaning while can make the surface reaches a certain cleanness and roughness, but the anchor lines shallow, and easy to damage to the environment.

[4] shot derusting spray (cast) : shot derusting spray (cast) is driven by high-power motor spray (cast) shoot high-speed rotating blades, make steel grit, steel shot, segment, minerals and other abrasive wire under the action of centrifugal force on steel pipe surface spray (cast) processing, not only can thoroughly remove rust, oxides and dirt, and high-pressure boiler steel pipe under the action of abrasive violent impact and friction, also can achieve the required uniform roughness.

After shot derusting spray (left), not only can enlarge the physical adsorption on the surface of the pipe, and can enhance anti-corrosion layer and mechanical adhesion on the surface of the pipe. Therefore, shot derusting spray (cast) is an ideal cleaning pipeline corrosion protection method. In general, shot peening (sand) is mainly used for high pressure boiler steel pipe derusting surface treatment, shot (sand) is mainly used for pipe derusting outside surface treatment. Using spray (cast) shot derusting several problems should be paid attention to.

With the development of the current our country economy, long distance oil and gas pipeline is an important means of energy security, in the process of oil (gas) pipeline anticorrosion construction, high pressure boiler tube surface derusting also led to the life they use factor. To ensure the quality of the anticorrosive coating, on the basis of the same equipment, improve the technological level, reduce the production cost.