Due to the transportation process and the rough loading and unloading of 3PE anticorrosive steel pipe at the port, the coating of the anticorrosive steel pipe will inevitably be damaged. The following is the repair plan for the 3PE anticorrosive steel pipe coating damaged at the construction site. Description of maintenance and construction scheme of thermal shrinkage belt:

1. Bottom treatment: Clean the dust and oil on the damaged surface of the anticorrosive steel pipe coating, grind off the edge of the anticorrosive steel pipe coating, and remove the rust with the tool to the St3 level.

2. When the ambient temperature is low, the steel plate is heated with a gasoline blowtorch or liquefied gas spray gun, so that the surface of the steel plate is heated to 30 ℃.

3. Install the thermal shrink belt: open the packaging of the thermal shrink belt, wrap the thermal shrink belt on the damaged anti-corrosion layer, and pay attention to the inner wall of the thermal shrink belt should not have dust, stones, and other debris in the installation process, must be wiped clean with a clean cloth. One end of the glue is heated by the spray gun until the glue melts, the other end of the lap is pressed, and the heat shrink belt forms a circular sleeve, which is put over the damaged part. The laminating position is from the middle position of the roller to drive out the middle air until the molten glue overflows on both sides, and the overlapping end needs to be pressed tightly without air holes.

4. Heating heat shrink tape: a group of two people, two people on both sides of the wound respectively, the hand-held spray gun for heating heat shrink tape, adhesive layer melting, heat shrink belt contraction, clamp on the welding mouth. At the beginning of the operation, starting at the center line of the weld, one side is heated and contracted to the edge, then from the center - the line is contracted in the same way to the opposite side of the applied heat. This lets out the air in between and holds the heat-shrinkable tape tightly to the steel.

In the operation, two people should cooperate with each other, the direction is one to one, the movement is uniform, and the size of the French fries is moderate. The thermal shrinkage zone is too large and moves too fast, so the heat conduction of the thermal shrinkage zone cannot be maintained, the thermal shrinkage zone cannot be fully melted, and the adhesion force will be affected to reduce the peeling strength. And can not achieve the ideal anti-corrosion effect. Moving too slowly without causing heat shrinkage The surface of the tape will carbonize the rubber surface due to overheating, which will also reduce the overall performance. After carbonization, there will be seven color spots on the surface of the strip body, visual inspection found that the colloid did not melt, and can only be stripped test, so the construction quality is particularly important in the construction.

Compaction correction: After the shrinkage of the sleeve is completed, the cover plate and sleeve joint can no longer be rolled and grooves cannot appear. Check the whole body for integrity and damage. Is the side of the coverage extended by the sleeve, is there a hanging edge Angle that can be suspended and pulled, if it can be suspended, please cut it off with a knife, trim and make it smooth. If there are bubbles, the bubbles must be driven to the edge by the drum to release, do not pour the air body, must ensure the integrity of the sleeve, qualified sleeve at both ends of the structure will produce a small amount of colloid overflow.

Cangzhou shenlong pipe manufacturing co., ltd. Is engaged in oil, gas, water, coal slurry mixing medium steel pipeline coating operations, anti-corrosion, insulation, piping is set in a body's specialized pipeline engineering precast construction enterprises, products used in an oil pipeline, chemical piping, electrical, pipe, gas pipe, heat pipes, sewage pipes, etc. Anti-corrosion processing of straight pipe and bend pipe DN40-3000 three-layer structure polyolefin (PE, PP, TPEP,3LPE) steel pipe coated with anti-corrosion, DN40-3800 steel hot stewed bend pipe and pipe fittings coated with FBE, epoxy resin coating anti-corrosion, DN40-3800 steel pipe inner wall resistance reduction, solvent-free epoxy steel pipe, epoxy paint anti-corrosion, Coated plastic steel pipe, dip plastic steel pipe. Lined with plastic steel pipe PE, PO, PP, PTFE, HDPE, polymer polyethylene corrosion. The company is in strict accordance with China Petroleum and Natural Gas SY/T0413-2002, national GB/T23257-2009, German DIN 30670, American AWWA C210, and other international and domestic anti-corrosion standards.