Coating method of Q345B seamless pipe
1. Pipe orifice grinding: after cutting, the plastic layer at the pipe orifice shall be polished with an angle grinder, so as to avoid melting or even burning of the plastic layer during flange welding and damaging the Q345B seamless pipe. Use an angle grinder to polish the plastic layer at the nozzle.
2. Plastic coating treatment: after polishing, use oxygen and acetylene to heat the pipe orifice outside the Q345B seamless pipe, until the inner plastic layer is melted, and then the technician will evenly apply the prepared plastic powder to the pipe orifice, and pay attention to the full application in place, and the flange plate plastic coating shall be applied above the water stop line. In this process, the heating temperature shall be strictly controlled.
3. Cutting: according to the actual required pipeline length, the metal saw and toothless saw shall be used to cut the pipeline. When using water welding in the cutting process, there must be a protection method for the raw materials. When cutting Q345B seamless pipe, the fire-resistant and heat-resistant materials shall be used as baffles at both ends of the fracture to catch the sparks and hot metal beans falling during the cutting and protect the original plastic layer of the raw materials.
4. Q345B seamless pipe connection: after the completion of plastic repair, connect and install the Q345B seamless pipe and pipe fittings, add rubber gasket between the flanges during the connection process, and fasten the bolts to the sealing state.