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 1, seamless steel pipe orifice grinding: cutting is completed, should use the angle grinder on the orifice of the plastic layer grinding treatment, the purpose is to avoid the plastic layer in the flange welding melting or even burning the pipe damage. The purpose is to avoid melting or even burning of the plastic layer during flange welding, so that the pipe will be destroyed.

 2, seamless steel pipe coating treatment: grinding is completed, the use of oxygen, C2H2 in the pipeline outside the mouth of the pipe heating, heating to the internal plastic layer part of the melting phenomenon, and then skilled workers will be prepared to use the plastic powder on the mouth of the pipe evenly coated, should pay attention to be coated in place, the flange coated with plastic to be coated to the water stop line above. This process should strictly control the heating temperature, such as the temperature is too high, there will be bubbles in the process of plastic coating, such as the temperature is too low, in the process of plastic coating plastic powder melting is not complete, the above situation in the pipeline put into use will produce the phenomenon of plastic layer off, and ultimately, the seamless steel pipe part of the pipeline was corrosion damage.

 3, seamless steel pipe cutting: according to the actual length of the required pipeline, the pipe should be cut using metal saws, toothless saws. In the cutting process when using water welding must have a protection method for raw materials, cutting should be in the position of both ends of the fracture with fire-resistant and heat-resistant materials to do the baffle to catch the cutting of the falling sparks and hot iron water beans, to protect the original plastic layer of raw materials.

 4, seamless steel pipe pipe connection: make up the plastic is completed, the pipe and pipe fittings connected to the installation, in the connection process between the flange with a rubber gasket, tighten the bolt when tightened to the sealing state.