久久99国产精品久久,免费看美女被靠到爽的视频,亚洲欧美综合区丁香五月小说,五十路熟妇亲子交尾,久久99精品九九九久久婷婷

Plastic coated steel pipe manufacturer

What are the welding requirements for plastic coated steel pipe manufacturer? The manufacturer of plastic coated composite steel pipe recommended that 150 mm long smooth pipe should be reserved at the joint of plastic coated steel pipe, so that the plastic coating film will not be burned during welding. After welding, plastic tape winding method, shrinkage band method or flame spraying method shall be used for anticorrosion treatment for welding joint and reserved 300 mm pipe end. The plastic anti-corrosion tape winding method is used to grind the welded joint of the welded steel pipe, and remove the dirt and welding residues on the surface of the reserved 300 mm non coated steel pipe. After polishing, a special adhesive for plastic tape is applied. Under proper heating or normal temperature, the plastic anti-corrosion tape with the same material as the plastic film of the steel pipe is tightly wound at the joint. When winding, each circle should Overlap 1 / 2. The connection methods and requirements of the inner plastic coated steel pipe are as follows: firstly, the flange shall be welded at both ends of the steel pipe, and the flange shall be welded firmly, and then coated with polyethylene. During the installation, the sealing gasket should be installed between the two flanges of the coated composite pipe, which can be pressed down with bolts. In addition, plastic coated steel pipe should be fixed, such as buttress, bracket and hanger, to ensure that the pipe will not produce axial direction under pressure or water hammer. When fixing, it should be considered that the pipeline will not be displaced under the action of pressure and deflection. For vertically installed pipes, the distance between two fixed points shall not be greater than 2m. During horizontal installation, the distance between the two fixed points shall be no more than 750mm when the nominal outer diameter of the coated composite pipe is less than 76mm, and it shall not be greater than 1100mm when the nominal outer diameter of the coated composite pipe is not less than 76mm. Word of mouth recommendation of plastic coated composite steel pipe manufacturers: adopt sand blasting chemical dual pretreatment, preheating, internal coating, external coating, curing, post-treatment and other processes. The internal and external plastic coated composite steel pipe is a high cost-effective product upgraded from traditional steel plastic pipe and galvanized pipe. The recovery of sales volume of plastic coated steel pipe for fire protection is mainly due to the impact of warmer infrastructure investment. Generally, the order of machinery used in the project commencement is excavator, crane, loader, heavy truck, tower crane, etc. Excavators and other large machinery is generally considered as one of the barometers of industrial economic investment activity. The upstream of its industrial chain is coal, steel and other energy industries. The internal and external plastic coated composite steel pipe is mainly divided into two types: inner plastic coated steel pipe and inner and outer plastic coated steel pipe. The coating materials are generally epoxy resin and polyethylene, and can also be customized according to customer requirements. The plastic coated steel pipe effectively solves the defects in the production and installation of steel plastic composite pipe in the past. When the inner plastic coated steel pipe is fixed with cement or brick buttress, the pipe can be built in the buttress. When support, bracket and hanger are used for fixing, U-shaped or other type pipe clamps shall be set in pipe or pipe fittings. As the pipe surface is smooth, in order to prevent the pipe clamp from sliding, rubber pad shall be placed between the pipe surface and the pipe clamp, and the pipe shall be tightened with screws to prevent its sliding, and then the pipe clamp shall be firmly connected with the buttress, bracket and bracket through bolts, etc. The inner plastic coated steel pipe can also be installed according to the user's drawing. When the construction drawing cannot be provided, the special pipe connector can be designed and made for the user to connect with the mining pipe material or with the seamless steel pipe through the fast pipe clamp. During the installation of inner plastic coated steel pipe, the warning line on the pipe must face to the outside to form a line to show warning. Plastic coated composite steel pipe manufacturers recommend that the inner surface of the plastic coated steel pipe is smooth, with small flow resistance, flow rate, and no scaling, and is not easy to breed microorganisms, which can fully flow and use effect, save energy and environmental protection; and the plastic coated steel pipe has excellent chemical corrosion resistance, water resistance and solubility resistance, which can solve the corrosion of water transmission, buried pipeline and acid, alkali and salt on fire fighting pipeline, which will be large The service life of large pipeline can reach more than 50 years or more!