Spiral pipe derusting and anti-corrosion process:
Derusting is an important part of the anti-corrosion process of spiral welded pipe pipelines. En el presente, there are many derusting methods, such as manual derusting, sand blasting and pickling and so on. Entre ellos, eliminación manual de óxido, eliminación mecánica de óxido y eliminación de óxido de pintura (aceite de cepillado anticorrosión) son métodos de eliminación de óxido relativamente comunes. The following is a brief introduction to the specific operation requirements of these three rust removal processes by welded pipe manufacturers.
1) Manual rust removal
Use scrapers and files to remove the oxide skin and casting sand on the surface of the pipes, equipos y contenedores, and then use a wire brush to remove the rust on the surfaces of the spiral pipes, equipos y contenedores, luego pulirlos con papel de lija, and then use cotton silk to remove them. Wipe clean.
2) Mechanical descaling
First remove the oxide skin and casting sand on the surface of the pipe with a scraper and a file; then one person is in front of the rust remover, and one person is behind the rust remover, and the pipe is placed in the rust remover repeatedly to remove rust until the metal color is exposed; brush Before oiling, wipe it again with cotton silk to remove the floating ash on its surface.
3) Aceite para cepillos anticorrosión
Tubería, equipment and container valves are generally subjected to anti-corrosion and oil brushing according to the design requirements. When there are no design requirements, the following regulations shall be followed:
1. Exposed pipes, equipment and containers must be painted with an anti-rust paint first, and then painted with two top paints before handover. If there are requirements for thermal insulation and anti-condensation, two anti-rust paints should be painted;
2. Two coats of anti-rust paint should be applied to concealed pipelines, equipos y contenedores. The second coat of anti-rust paint must be painted after the first coat of paint is completely dry, and the consistency of the anti-rust paint should be appropriate;
3. Cuando la tubería enterrada se utiliza como capa anticorrosión, if the construction is carried out in winter, es recomendable usar aceite solvente de caucho o gasolina de aviación para disolver 30 un o 30 asfalto de etilo de petróleo. Dos tipos:
① Cepillado manual: El cepillado manual debe aplicarse en capas., cada capa debe ser recíproca, entrecruzado, y el recubrimiento debe mantenerse uniforme sin perder o caer;
② Pulverización mecánica: Al rociar, el flujo de pintura rociada debe ser perpendicular a la superficie de rociado. Cuando la superficie de pulverización es plana, la distancia entre la boquilla y la superficie de pulverización debe ser de 250-350 mm. Si la superficie de pulverización es una superficie de arco, la distancia entre la boquilla y la superficie de pulverización debe ser de unos 400 mm. , Al rociar, el movimiento de la boquilla debe ser uniforme, la velocidad debe mantenerse en 10 ~ 18 m/min, y la presión de aire comprimido utilizada para la pintura en aerosol debe ser 0.2 ~ 0,4MPa.