Application processing method of seamless steel pipe

Fujin Iron and Steel2021-09-29

1. Grinding the nozzle of seamless steel pipe: After cutting, the plastic layer of the nozzle should be polished with an angle grinder. The purpose is to avoid melting or even burning of the plastic layer during flange welding and destroying the pipeline. Use an angle grinder to polish the plastic layer of the nozzle.

2. Seamless steel pipe plastic coating treatment: After polishing, use oxygen and C2H2 to heat the pipe mouth outside the pipe until the inner plastic layer is melted, and then the skilled worker will evenly apply the prepared plastic powder to the pipe mouth , It should be noted that it must be applied in place, and the flange plate shall be painted above the water stop line. In this process, the heating temperature should be strictly controlled. If the temperature is too high, air bubbles will be generated during the plastic coating process. If the temperature is too low, the plastic powder will not melt completely during the plastic coating process. The above conditions will produce plastic after the pipeline is put into use. The phenomenon of layer peeling, and finally the seamless steel pipe part of the pipeline is corroded and damaged.

3. Seamless steel pipe cutting: According to the actual required pipeline length, the pipe should be cut with a metal saw or a toothless saw. When water welding is used in the cutting process, the raw materials must be protected. When cutting, fire-resistant and heat-resistant materials should be used as baffles at the two ends of the fracture to catch the sparks and hot iron water beans that fall during cutting to protect the raw materials. The original plastic layer.

4. Seamless steel pipe pipe connection: After the plastic repair is completed, the pipe and the pipe fittings are connected and installed, and rubber gaskets are added between the flanges during the connection process, and the bolts are tightened to the sealed state.