3EP coated steel tube Generally used in municipal and major building water supply and drainage above, it is the outer wall coating high adhesion, impact resistance, anti-corrosion weather-resistant thermosetting powder coating, inner wall coating high adhesion, anti-corrosion thermoplastic powder coating.It is made by sandblasting chemical double pretreatment, preheating, internal coating, external coating, solidification, post-treatment and other processes.Besmear steel tube wall bright and clean, good drainage performance, fluid resistance is small, not fouling is compared with other pipe advantages, can greatly reduce the loss.In the meantime, the linear expansion coefficient of besmear model tube is very small, this makes its as main trunk conduit very advantageous, overcame the blemish with big linear expansion coefficient of other plastics and common pipe material greatly.Large diameter coated steel pipe is the traditional steel and plastic pipe, galvanized pipe upgrade type of high cost performance products.It has comprehensive characteristics, namely steel pipe high strength, high extensibility, low temperature brittleness, small expansion coefficient, and plastic pipe corrosion resistance, wear resistance, fluid resistance, small and other advantages, belongs to a new water supply and drainage, anticorrosive green large diameter pipe, by the domestic industry more and more widely used.The fire service plastic-coated composite pipe is used in the hot water pipe, and it is necessary to prepare the polyethylene lining in advance.When using sealant, it is necessary to apply heat-resistant rubber for sealing. Hot water cannot be directly used in cold water pipes and fittings.
Plastic coated composite pipe fire pipeline system at present the high ratio of fire water supply pipe material, because the interior and exterior wall coating thermosetting powder materials, epoxy resin, it is easy to absorption after high temperature preheating of steel pipe on the pipe wall, the wall is not easy to rust, not easy scaling, not easy to breed microorganisms, makes the pipe wall is smooth, fluid resistance is small, and adsorption on steel pipe of epoxy resin through adsorption test, not easy to fall off.Fire water plastic coated composite pipe through a continuous high temperature combustion test, burned for an hour at 300 ℃, has reached the limit, shows that the pipe has a strong resistance to high temperature performance, in addition to the above performance, pipeline also has the very strong shock resistance, health and safety performance of high strength, fits in well in the field of fire sprinkler system.This paper solves the problem of corrosion and scaling of common fire water supply pipe buried in ground and water conveyance.no clogging pipe and clogging spray head will occur, and the service life of fire water supply pipe is improved.At the same time, it reduces the maintenance cost and saves the cost of replacing the pipe.Due to the adhesion problem of epoxy powder dipping process, epoxy powder dipping has not been popularized.Inner EP and outer PE coated composite steel tube has been treated with superior anti-static treatment from the inside to the outside, and the effective materials and components of anti-static performance are evenly distributed on every little point inside and outside the whole pipe.Moreover, the anti-static ability has reached the standard of the whole industry in our country, and even the whole has been surpassed, which is suitable for special work in the underground mine of our coal mine.In addition, our internal and external coated steel tubes have the performance of preventing combustion, which is also produced according to relevant standards. This characteristic is not possessed by other pipe locks.
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