The following are four methods of spiral steel pipe surface derusting treatment:Cleaning, Spray rust removal, Derusting tools, and Pickling.

At present, the proportion of oil and gas transported by longitudinally welded pipes in the world is increasing, accounting for about 75%-95% of the total oil and gas. At present, the scope of transportation is gradually expanding, not only petroleum and natural gas, but also various chemical industries.

The forming methods for manufacturing large-diameter LSA steel pipes include UOE forming method, roll forming method (CFE), CE forming and so on. For most of the forming methods, the last process is to perform a full-length expansion of the welded tube blank to improve the quality of the welded tube.

Flanged means that the end of the pipe is convex to the inside or outside, and the rounded edge: a pipe fitting that forms a bulge or groove in the circumferential direction of the pipe.

Pipe end thickening is mainly used for petroleum steel pipes and geological steel pipes. Because the pipe wall is thinned after the pipe end is threaded, the threaded connection part becomes the weak link of the strength of the entire pipe body.

In order to increase the use space of the building, the designer of the building will centrally install some pipes. In this case, there will be some pipes passing through the floor, roof and various walls.