Building Water choose five points Details

Four ministries and commissions under the State Council regulations from June 1, 2000, in the new residential town, prohibit the use of cold galvanized steel pipe for indoor water supply pipeline, and gradually restrictions prohibit the use of hot galvanized steel in accordance with local conditions, promote the use of aluminum composite pipe, PE-X pipes, PP-R pipes and other new pipe, where conditions permit may promote the use of brass. Under the guidance of the government's industrial policy, China's construction of new water supply endless varieties, are widely used in engineering. So far, the building water pipe nearly more than 20 kinds of species, far beyond the promotion of the tube file types, which can be divided into metal pipes, metal plastic composite pipe, plastic pipe and three categories. In a water supply pipeline species can be derived in many forms according to their connections. Faced with a wide variety of pipe products how choice? The following is my analysis of project characteristics in various pipe characteristics, based on the principles of the proposed selection and consideration. First, the construction of water supply selection principles: 1. Security and reliability. This is the building to the water the most important principle, because there is pressure building water supply pipe, leaking burst once will make the building and the people and property losses. Pipe should be able to withstand shock and vibration, water hammer and thermal expansion and contraction, and time-tested, watertight, does not burst. 2. economy. Use safe water to meet the premise, spend the least money choice pipe. Price comparison pipe fittings but also compare prices, but also to compare the cost of construction and installation. 3. sexual health. Obviously, the current market of pipe are to meet the national standard GB / T17219-1998, and through nationally recognized testing department test, qualified to the market. On the current requirements of our health standards, the construction of water supply are within the scope of health permits. But various modifiers of plastic pipe, auxiliaries and additives, metal pipe water-soluble metal ion, which are collectively referred to as the cause of human-induced change of the environmental factors, such as an organ of the human body caused by factors need further study of the human being Discussion. So without modifiers plastics and chemical composition or surface coating good heavy metal molecules metal pipe health performance, and vice versa. 4. energy saving. Any pipe from the raw material refining synthetic, melt cadmium, rolling machine, injection extrusion have to consume energy, from a macro point of view, than the plastic pipe to the metal pipe energy. Using thermal expansion during compounding, spraying plastic composite pipe composite technology energy than metal pipe, thick-walled tubes energy than the thin-walled tube. From the perspective of the construction process analysis, with welding, gas welding, hot melt connection than brushing teeth twist to energy. 5. Sustainable development. Any kind of pipe that can be used by people without failure, which is very important reason is that it can be recycled and reused no new contamination. For plastic pipes, most of which could be reused waste recycling, and for PE-X pipe can not be used because of waste or reuse, and can not be degraded, this issue has been a problem to explore. There is a cross-linking agent is not added modified polyethylene (PE-RS) come out, which makes the development of such a plastic pipe becomes sustainable. Over time, some with mutagenic environmental factors in the development of plastic pipe has become unsustainable a. Choose over construction of water supply, such as the principle of contradiction between, first of obedience is safety and reliability. There is no doubt. Second, the construction of water supply selection considerations 1. architectural standards. Fully furnished with high-grade high-grade commercial housing should pipe, such as brass and stainless steel pipes, while rough housing is the most expensive pipe such as PVC-U or PE tubes, etc., because the design is not very thoughtful consideration for homeowners, often decorated at these pipes as construction waste away. 2. The life of the building. Usually high-rise buildings set life of 100 years, multi-storey buildings set at 50 years, selected pipe should match. Have already moved house, such as the replacement of water pipes is very difficult to be without water damage decoration. 3. Water temperature: can be divided into cold water pipes and hot water pipes applicable. 4. Water quality: Drinking water can be distinguished general transport and delivery of drinking water. 5. Use: pump house piping, due to the vibration and by water hammer and maintenance, etc., should be used metal pipe. Pressure riser, water mains as human aorta, high reliability requirements appropriate to the metal tube. Into the household manifold pressure generally does not exceed 0.6MPa, it can also be used with a metal pipe plastic pipe. Water tank (pool) in the pipe is generally made of metal pipe, switch to bear torque hydraulic valve. 6. laying method: Ariake apply Concealed Ming coated with indoor and outdoor Ming Lu. Plastic water pipe should not be outdoors for surface, vulnerable to solar ultraviolet radiation, accelerated aging. Some soft plastic tube is not suitable for indoor for surface, thermal expansion and contraction bent. Concealed inside the tube hole there, embedded in the ceiling wall, or embedded in the leveling layer, the inner aluminum lined pipe corrosion due to cement should not be buried or in-wall installation. 7. diameter: large diameter pipes or building to metal and plastic composite pipe, large diameter plastic pipe because some supplies and connection quality difficult to control, neither desirable nor economical. 8. Header form: card sets connected to removable, easy to install, but easy to leak, especially for the hot water system, due to alternating hot and cold, easy to loose joints. Press-on connection construction convenient, but not removable, sealing well. Adhesive socket construction convenient, non-removable, sealing is acceptable but requires special adhesive and avoid open flames. Groove connection, small caliber does not apply, generally used for large diameter pipe, but a section of pipe corrosion must deal with. General PE, PE-X plastic lining plastic composite pipe due to the toughness and creep resistance, can be used to groove connection. Hot melt connection leaking small chance, but requires fast construction, horizontal and vertical degrees to grasp, it can not be modified once the connection is a foregone conclusion, but the large-diameter melt quality assurance poor. Welded connection is only available in brass, high construction costs, and there is fire. Wire port connection is only available in plastic-lined (coated) steel-plastic composite pipe, electroless nickel-phosphorus alloy steel tube, fittings of malleable fittings injection molding applications. Flanged applicable only large diameter pipeline. 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