Views: 4 Author: Site Editor Publish Time: 2021-01-01 Origin: Site
1. Grinding of the pipe mouth of seamless steel pipe: After cutting, the plastic layer of the pipe mouth should be polished with an angle grinder. The purpose is to avoid melting or burning of the plastic layer during flange welding and destroying the pipe. Use an angle grinder to polish the plastic layer of the nozzle.
2. Plastic coating treatment of seamless steel pipe: After polishing, use oxygen and C2H2 to heat the pipe mouth on the outside of the pipe until the internal plastic layer is melted, and then the skilled worker will evenly spread the pipe mouth with the prepared plastic powder , It should be noted that it must be smeared in place, and the flange shall be smeared above the water stop line.
In this process, the heating temperature should be strictly controlled. If the temperature is too high, 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 shedding will eventually corrode and damage the seamless steel pipe part of the pipeline.
3. Seamless steel pipe cutting: According to the actual pipe length required, 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 molten iron 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, connect the pipe and the pipe fittings and install rubber pads between the flanges during the connection process, and tighten the bolts to the sealed state.