Coated spiral steel pipe

Cang Sheng Hebei Pipe Manufacturing Co. (company specializing in the production of steel-plastic composite pipe production of large enterprises, over the years the company relies on advanced production equipment and strong technical force, with the production of a variety of composite pipe production capacity can be lined in the production, internal and external coating (PE, EP, PO, PEX) galvanized coated steel pipe, and other composite pipes. The company has a modern management model, has passed the ISO9001 international quality system certification. product quality by detecting the national authorities, the indicators have reached the standards of its products are widely used in large-scale drainage projects, water projects, desalination, oil, gas, power, chemical, metallurgy, coal, shipbuilding, food and other industries a basic overview of lining plastic composite pipe: the implementation of standards CJ / T136-2007 cold water tube, adapt to the temperature of minus 40 degrees --95 degrees, connections to /; using a variety of contact connection mode thread, flange, grooves, welding, etc. Application: construction, municipal, water, sea water, air conditioning circulating water, purified water, sour, salty, and salt water pipelines, water supply and environmental protection lined with plastic composite pipe, also known as: water supply plastic pipe, composite plastic pipe, plastic composite pipe, painted plastic fire control products to seamless, welded steel pipes for the base pipe, wall coating high adhesion, corrosion, food grade hygienic polyethylene powder coating or epoxy paint. using pre-treatment, preheating, inside painting leveling, galvanized water after treatment in the process made plastic composite pipe, galvanized pipe upgrade traditional products 2 2.1 a steel advantages for a wide range range specifications: Currently, in building water supply industry , high-rise building water supply and fire pipe is about long-term use of pressure 1.6MPa, therefore embedded in the plastic-lined steel bars designed to determine the pressure in 2.0MPa can basically meet the requirements of building water supply pressure, but the parameters are wall Important design parameters thick using temperature is an important parameter in the design of the pipe, which determines the allowable stress of the material in the industry, according to the temperature of transport water into cold water and hot water, cold water temperature is generally 0 ℃ ~ 25 ℃, But inside surface mounted pipeline medium temperature by atmospheric temperature, summer temperatures in southern China up to about 40 ℃, while the northern winter temperatures can be lower than -40 ℃, but water freezes at below 0 ℃ ice, so as to achieve not the purpose of water. So there are some in the industry norm insulation, make pipe water temperature has remained above 0 ℃, in order to maintain a fluid may flow. Usually used for heating hot water, shower, the water temperature is usually 75 ℃, instantaneous temperature up to about 95 ℃. between the above investigation, embedded within the gluten-lined steel pipe into cold water and hot water type two categories, long-term use to determine the type of cold water temperature is 0 ℃ ~ 55 ℃, heat Long-term use of water-pipe temperature of 0 ℃ ~ 75 ℃, instantaneous temperature up to 95 ℃. Specifications standardized by pipe diameter is determined as DN15, DN20, DN25, DN32, DN40, DN50, DN65, DN80, DN100, DN125, DN150 , DN200, DN250, DN300 and other varieties. 2.2 Second, the production process unique: In the product structure to determine what technology of production is a vital economic activity, it is directly related to the cost of production and production efficiency, while in turn the product design, The choice of materials requested workmanship. Lined steel reinforcement embedded within a unique complex mechanical drawing process, through the metal tube necking oppression inner plastic tube, two materials cause permanent reasonable interference, coupled with the inner surface of the pipe inner ribs unique tread design Embed effect on the plastic surface of the tube, as well as physical and chemical modification of composite plastic pipe before such reinforcement embedded within the plastic-lined steel pipe with a non-hierarchical, indented tube, long-term use is guaranteed technical characteristics. And won the national utility model patents in 2001. This unique process to produce high efficiency, process control easy, high quality composite. 2.3 Third, reliable connection shortcut: pipe connection between the building materials industry is the most important issue, the connection strength may not be reliable, it is not easy to install, repair, can not adapt to the harsh natural conditions, these issues are users, design, construction and other issues are most concerned about the various units. Lined with steel reinforcement embedded within the use of cold extrusion principle at a distance from the pipe end surface is formed as an extension of a small circular groove change, then spring type stainless steel ferrule into the slot, put a nut or interface, the new enamel pipe fittings and its annexes, can be tightened, quick installation. Because part of the snap ring with self-locking tapered design, and the use of two-way end and radial seal design, so that it has a reliable connection strength and anti-leakage performance. At the same time as all fittings used removable structure, coupled with special live takeover pieces to use, it is extremely easy to maintain. 2.4 Fourth, the outer surface of the perfect anti-corrosion measures: As we all know, the corrosion of steel is very popular, and the resulting economic losses are enormous. We know that the corrosion of steel was mainly due to electrochemical corrosion, corrosion aging of plastics and chemical corrosion is mainly caused by ultraviolet radiation, embedded within the gluten-lined steel pipe due to the inner plastic tube by an outer metal tube shelter, complete elimination of the plastic Causes of corrosion aging, the plastic tube has a durable performance. The protective outer layer of the metal tube is much more difficult. Lined with steel reinforcement embedded within the outer surface using a three-tier anti-corrosion measures: first layer of zinc plating, steel forming the cathode protection rust. Second layer: epoxy primer, dense polymer in the outer layer to form a protective film galvanized, so that air, water isolation, slow down the corrosion of zinc oxide layer, thereby increasing the useful life of the pipe. Third layer: finish, strengthen the protection of the role of film, and improve aesthetic appearance of the product. When buried use, the use of appropriate anti-corrosion measures to improve the life of the system; also can be used in plastic-lined steel pipe for the group, the outer surface and then covered with a layer of plastic pipe "embedded within the gluten-sided plastic-lined pipe" ( PE pipe + carbon steel pipe + PP pipe) products directly buried underground. 2.5 V. reasonable pipe wall thickness: wall thickness is an important parameter in the design formula "Mechanical Design Manual" Article 3 pipe wall thickness is given: S = PD / (2 [δ] ψ) + C where: S: pipe wall thickness (mm) P: inner tube medium pressure (MPa); D: tube diameter (mm); [δ]: Pipe operating temperature allowable stress (MPa); j: longitudinal weld pipe coefficient, seamless j = 1; welded steel pipe j = 0.8; C: wall thickness value (mm); including making negative bias C1; corrosion allowance C2; ??thread depth C3; C = C1 + C2 + C3. Steel bars embedded in the plastic-lined pipe wall thickness is determined by the above theory. Xu piping material stress [δ] generally based on the strength of the material divided by the safety factor corresponding to take the lowest value as the material allowable stress, the stress on the piping material to allow the value. And because the embedded lined steel pipe inner ribs snap ring connection, cold extrusion recesses, without regard to the added value of the wall thickness of C3. As compared with traditional galvanized steel pipe, wall thickness is more reasonable, there is significant economic potential. 3 Pipe disadvantage: the high cost 2: Install laborious 3: You can not completely solve the tube connecting portion of the water pollution problem 4 pipe application (environmental) technology lined steel pipe lined with steel pipe and plastic pipe inherit their respective advantages, and in accordance with After a comprehensive analysis of market demand, production technology, corrosion protection, connection, cost-effective, and many other aspects of the rational design of pipe. Thus, the pipe has a number of technical features, is widely used in various types of construction of water supply system of hot and cold water. Connections are dedicated snap ring connection, the groove (snap) connection or threaded connection, the construction process is similar to steel pipe and steel pipe trench connecting threaded connection. With the popularity of environmental awareness, health awareness, a new environmentally friendly water supply pipe mushroomed after another, it is difficult to enumerate the many varieties. Lined steel pipe and plastic pipe inherited their advantages, but also abandoned their disadvantages. Tube design in one of the most important content is based on the use conditions and requirements, reasonably determine the wall thickness of the pipe, while the parameters directly affect the price of the product. Lined steel pipe wall thickness of unique design includes an inner plastic pipe wall thickness and outer pipe wall thickness, which determines its range of technical features: 1, a wide range, the full range specifications; 2, a unique production process; 3, the connection reliable and efficient manner; 4. measures to improve the surface corrosion, beautiful; 5, the outer pipe wall thickness design is reasonable; reasonable thickness 6, the inner plastic tube, ensuring path; 7, energy saving and environmental protection, development potential;