Currently, anticorrosive steel pipes are among the commonly used steel pipes, including but not limited to 3PE anticorrosive steel pipes, TEPE anticorrosive steel pipes, and epoxy resin anticorrosive steel pipes. So, what precautions should be taken during the construction of anticorrosive steel pipes?
Spraying Technology for 3PE Anticorrosive Steel Pipes
Currently, most domestic 3PE anticorrosive steel pipe production technologies employ a production process of "epoxy powder spraying, adhesive and polyethylene lateral extrusion, and winding rolling." This method eliminates the need for rolling, as the powder and electrostatic thermal spraying technique addresses the issue of thin coatings on the welded seams of spiral structure steel pipes. It also saves on mechanical equipment such as plastic extruders on the production line, reducing energy consumption.
Specific construction steps: The steel pipe, after shot blasting for rust removal, is heated to a moderate temperature of 210°C to 220°C, where the epoxy powder remains in a molten state. The adhesive and PE are extruded into thin sheets by an extruder and sprayed onto the steel pipe, which is then flattened with a roller. The epoxy powder is in powder form, while the adhesive and PE are in granular form, requiring electrostatic spraying and plasticizing extrusion wrapping.
Painting Construction for Epoxy Resin Anticorrosive Steel Pipes
Coal tar enamel anticorrosive paint is a type of hot-applied anticorrosive material, primarily composed of coal tar, wash oil, and asphalt, with additives as auxiliary materials. It boasts strong adhesion, low water absorption, good insulation, resistance to bacterial corrosion, penetration by plant roots, dissolution by petroleum and its products, soil stress, cathodic disbondment, and a long service life. Therefore, it is suitable for the anticorrosion of various underground pipelines.
However, during the painting process of epoxy resin anticorrosive steel pipes, it is necessary to first open the thick paper drum, take out the solid topcoat, and break it into small pieces. After heating and melting, the topcoat should be placed in a container with a stirrer to avoid contamination. Use a closed heater to heat slowly and evenly to prevent direct contact between the topcoat and the flame source.
Safety Precautions During Anticorrosive Steel Pipe Construction
The spraying process generates highly dispersed paint mist and volatilized solvents. Fine particles in spraying or plastic coating can easily be inhaled into the lungs, posing a hazard to human health. Additionally, it may cause discomfort, headaches, dizziness, nausea, vomiting, loss of appetite, and inattention, potentially causing varying degrees of toxicity to the respiratory, circulatory, digestive, and reproductive systems.
Therefore, safety precautions should be taken during the construction of anticorrosive steel pipes, such as wearing protective goggles, gas masks, or long-tube respirators. Suitable chemical protective gloves can effectively protect hands from harm caused by spray materials or other liquids.
