1. Thick-walled steel pipe cutting: According to the actual required pipeline length, metal saws and toothless saws should be used for cutting pipes. When using water welding in the cutting process, there must be a method of protecting the raw materials. When cutting, the fireproof and heat-resistant materials should be used as baffles at the ends of the fracture, so as to catch the sparks and hot metal beans falling during the cutting, protect the original plastic layer of the raw material.
2. Thick-walled steel pipe connection: After the plastic replenishment is completed, connect the pipe to the pipe fittings, add rubber pads between the flanges during the connection process, and tighten the bolts to a sealed state.
3. Plastic coating of thick-walled steel pipe: After polishing, use oxygen and C2H2 to heat the pipe mouth outside the pipe. After heating to the internal plastic layer, there will be a melting phenomenon, and then the technical workers will apply the prepared plastic powder to the nozzle evenly. It should be applied in place, and the plastic coating of the flange should be applied above the water stop line. This process should strictly control the heating temperature. 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. In the later stage, the thick wall steel pipe part of the pipeline was corroded and damaged.
4. Thick-walled steel pipe nozzle grinding: After cutting, an angle grinder should be used to grind the plastic layer of the nozzle. The purpose is to avoid melting or even burning the plastic layer during flange welding to damage the pipeline.
Post time: Jul-01-2020