Application processing technology of seamless steel pipe:
1. Grinding the nozzle of seamless steel pipe: After cutting, the plastic layer of the nozzle 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 pipeline. 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 outside the pipe until the internal plastic layer is melted, and then the technician will evenly spread the pipe mouth with the prepared plastic powder , It should be noted that it must be applied in place, and the flange plate shall be painted 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 peeling, and finally the seamless steel pipe part of the pipeline is corroded and damaged.
3. Seamless steel pipe cutting: According to the actual required pipeline length, the pipe should be cut with a metal saw or a toothless saw. 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 the cutting, so as to protect the raw materials. The original plastic layer.
4. Seamless steel pipe pipe connection: After coating the plastic, connect the pipe and 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.
Tips: API 5L X52 seamless pipe is a steel grade of API 5L which specifies the manufacture of two product levels (PSL1 and PSL2) line pipe, X52 Line Pipe can be made seamless or welded, which are widely used as pipeline in the transportation of petroleum and natural gas.
Long-term storage of seamless steel pipes in sales shops may cause some rust problems.
Let's take a look together.1.
Tools for rust removal: mainly use wire brushes and other tools to polish the surface of seamless steel pipes, which can remove loose or warped oxide scale, rust, welding slag, etc.
The rust removal of hand tools can reach the Sa2 level, and the power tools can reach the Sa3 level.
Spray (throwing) rust removal: The spray rust removal is to drive the spray blades to rotate at a high speed through a high-power motor, so that steel grit, steel shot, iron wire segments, minerals and other abrasives are sprayed on the surface of the steel pipe under the action of centrifugal force.
It can completely remove rust, oxide and dirt, and the seamless steel pipe can achieve the required uniform roughness under the action of the violent impact and friction of the abrasive.
