We all know that the individual quality of spiral welded pipe is relatively large, so it must be stacked outdoors. But it is difficult to avoid being exposed to the sun and rain. So the rust problem has been puzzled the storage time and conditions of spiral welded pipe. Today, we need to carry out a comprehensive solution to the knowledge of anti-corrosion technology of spiral welded pipe.
The toolrust-removal of spiral welded pipe mainly uses steel wire brush and other tools to polish the steel surface, and then cleans and preheats the spiral welded pipe, which can remove loose or turnup mill scale, rust, welding slag and so on. Using manual tool to remove rust can reach Sa 2 level, using power tools can reach Sa 3 level. If there is steady oxide-scale adhering to the steel pipe surface, the effect of toolrust-removal is not ideal, it can not up to the depth of abrasion pattern that required by anti-corrosion construction.
Pickling refers to use solvents, emulsions to clean the surface of the spiral welded pipe (SSAW steel pipe) delivered by low pressure fluid, to achieve removing of oil, grease, dirt, lubricants, and similar organic matter, but it can not remove the rust, mill scale, welding flux, etc. on the surface of spiral welded pipe. So Pickling can only as an auxiliary mean in the anti-corrosion production. Manufacturer general use chemical and electrolytic two methods for pickling treatment, pipeline anti-corrosion technology only adopts chemical pickling, that can remove mill scale, rust, the old coating. And sometimes it can be used as re-treatment after derusting by sandblast. Although Chemical cleaning can make the surface to achieve a certain degree of cleanliness and roughness, but its anchor is shallow, and it is easy to cause stacking environment pollution of spiral pipe welding.
Reasonable using the means to clean the rusty pipe can ensure that spiral welded pipe serves the production for a long time and create more production efficiency.
