High Grade Spiral Steel Pipe Life Limit
High grade spiral steel pipe How long is the service life?
High grade spiral steel pipe Its own life without the restrictions, the service life and the main operation of the environment and the production process has a great relationship. High-grade spiral steel pipe operating environment is relatively poor in order to extend the service life of the steel pipe for the outer wall and diameter of anti-corrosion.
Anti-corrosion steel pipe is treated by anti-corrosion process, can effectively prevent or slow down the transport and use of chemical or electrochemical reaction occurred in the phenomenon of corrosion of steel pipe. Anti-corrosion steel pipe can effectively prevent or slow down the corrosion to extend the service life of steel pipe, reducing the cost of steel pipe operation.
High grade spiral steel pipe The domestic application of more steel pipe coating with oil asphalt, PE jacket and PE foam jacket, epoxy coal tar pitch, coal tar enamel, epoxy powder and three composite structure, epoxy coal tar pitch (PF type) , Rubber and plastic type epoxy coal tar pitch (RPC type), and so on to promote the most widely used in a number of pipeline corrosion protection for the three-tier PE composite structure, single-layer powder epoxy, PF cold-banding, RPC-type cold Wrapped around.
1, oil asphalt, raw materials widely, low prices. But poor working conditions, quality is difficult to guarantee, serious environmental pollution.
2, epoxy coal tar pitch, easy to operate, but the cover layer of curing time is long, affected by the environment, not suitable for field operations, 10 ℃ below difficult to construction.
3, epoxy powder corrosion, electrostatic spraying method, with the same material corrosion tube body sintered, strong adhesion, but the epoxy powder waterproof (water absorption is high, reaching 0.83%), to the cathode Protection design to bring some difficulties. Site equipment demanding, difficult to operate, the quality is not easy to control.
4,3 PE heat shrinkable material, pipe anti-corrosion sealing strong, high mechanical strength, waterproof, stable quality, easy construction, good applicability, does not pollute the environment. PE low water absorption (less than 0.01%), at the same time with high epoxy strength, low PE water absorption and good flexibility of hot melt adhesives, etc., has a high anti-corrosion reliability, the drawback is: compared with other cost of filling materials ,costly.
5, PF type, RPC type cold strip construction is simple and convenient, supporting the three kinds of stereotypes of plastic, so that PF epoxy coal tar pitch can be in any environment, any season, any temperature conditions.
6, cold-wrapped and 3PE heat shrinkable belt is characterized by: a variety of materials for the main anti-corrosion pipe, and other methods apply to the same or close to the main material of the coating pipe.
Second, with the development of some pipes in the anti-corrosion also need to heat, oil is a very complex mixture, easy to corrosion pipes, corrosion is necessary, but the oil pipeline in the case of anti-corrosion also need to do insulation, in the northeast and winter, Thermal expansion and contraction will freeze the pipeline, affecting the stable supply.