The simple and simple technological process for the production of
spiral seam submerged arc welded steel pipes: first, inspect the spiral seam submerged arc welded steel pipes to make them suitable for the conditions of making thermal insulation steel pipes, and inspect the steel pipes based on various conditions; the first step is to remove the embroidery on the steel pipes, use some special materials to clear the rust on the surface of the steel pipe so that the steel pipe is not corroded; the third step is to wear the pipe to form, and put the rust-removed and anti-corrosion steel pipe in the polyethylene casing; the fourth step is to repair the head, the center injects polyurethane foam to fully fill the space between the steel pipe and the polyethylene casing to make it integrated; the last step is product inspection, which is to inspect the finished spiral seam submerged arc welded steel pipe to meet the specifications. Good products are sold, and unsuitable products are refurbished and improved.
As long as the rust-removed and anti-corrosion steel pipe is placed in the polyethylene casing, polyurethane foam is injected in the middle to fully fill the space between the steel pipe and the polyethylene casing, so that the steel pipe, casing, and insulation layer form a stable group. The heat preservation steel pipe is formed to achieve the effect of anti-corrosion and heat preservation. This kind of anti-corrosion and thermal insulation method of thermal insulation steel pipe can be discharged or buried in the ground, and the whole construction process can be carried out on-site, which is convenient for construction and operation and is easy to be controlled by construction personnel, and the process is relatively simple.
