1. Grinding of the nozzle of seamless Steel pipe: after cutting, an angle grinder should be used to polish the plastic layer of the nozzle. The purpose is to avoid melting or even burning of the plastic layer during flange welding and destroying the pipeline.
2. Seamless steel pipe plastic coating treatment: after polishing, use oxygen and C2H2 to heat the pipe mouth outside 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 plate 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 coating process. If the temperature is too low, the plastic powder will not melt completely during the coating process and the plastic layer will fall off.
3. Seamless steel pipe cutting: according to the actual required pipeline length, metal saws and toothless saws should be used to cut the pipelines. When using water welding 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 pipeline connection: after the plastic repair is completed, connect the pipeline and the pipe fittings and install rubber pads between the flanges during the connection process, and tighten the bolts to the sealed state when tightening the bolts.
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