You have decided to replace old water pipes to the new? But wondering what material in favor of making a choice. Consider the advantages and disadvantages of tubes of the most common modern materials: plastic, copper, polypropylene. Metal pipes. in general form metal-tube are three-layer structure: the main pipe of cross-linked polyethylene (modified polyethylene with closed spatial molecular structure) is a good heat resistance (the maximum long-term operating temperature – 95 . C, maximum short-term – 110 C for several hours) is chemically neutral, harmless, long-lasting ability to withstand high pressure (working pressure of 10 atm.) Thermal expansion coefficient = 0.02 (mm / m * K) Metal pipes scope quite extensive – cold, hot water, central heating, heated floors. Disadvantages: range of diameters from 16 to 40 mm. Polypropylene tubes. Cyrem for PP pipes is a copolymer poliproplen-random bit of thermoplastics.
durability (according to all standards of construction is 50 years) low thermal conductivity of high temperature resistance (in Depending on the thickness – up to 75 C), the ability to withstand short-term temperature rise of up to 95 media. C, the absence of the electrical conductivity of chemically vopriimchiv to many aggressive media, eco-friendly easily washed out during operation, maintaining the hygienic properties during its useful life, which according to all standards of construction is 50 years. produce three types of pipes with a wall of varying thickness, designed for working pressure of 10, 16, 20 atm. reinforced polypropylene with improved thermal properties, allows for flexible and targeted use of the pipe – not overpaying, and with maximum efficiency. (K p = 0.062), reduced deformation temperature (one meter lengthened by 0.026 mm), increases the strength of the tube Disadvantages: The high coefficient of thermal expansion = 0.15 Copper pipe high resistance to corrosion Copper has a low roughness coefficient – 0.01 mm is not afraid of high temperatures.
The melting point of copper – 1083 S. There is no problem to use copper for the heating schedule of 95/70. She is not afraid of high pressures. Working pressure depends on the type of copper pipe diameter and wall thickness, for example, for not annealed tube 15h1 pressure – 85 atm. and for the annealed – 50 atm. linear expansion coefficient = 0.017 (mm / m * K) is not permeable to oxygen, leading to corrosion of radiators, valves especially when high temperatures. Copper has antibacterial properties, is environmentally friendly. Disadvantages: The price of the material, not much, but higher. According p.10.1 SNP April 2 01-85 mandatory use of steel pipes in water supply system is preservation of the inner and outer protective antirust layer. In most cases, connections are made by welding, which leads to the destruction of the inner and outer layer antirust. Consequently, the use of traditional technologies mounting steel pipe leads to a violation of regulatory requirements. Mistakenly believe! that the replacement radiators for modern materials will be less reliable due to the threaded connection (switching to a combined coupling), because Screwed imagine the most vulnerable point in the system. But do not wind onto the valves on the thread? Thread on the valves is no different from any thread on the adapter. (SNIP April 2 05 – 91 "steel and plastic pipes, when used in heating systems is equivalent to a technical decision") Be careful! Poor quality material, unskilled spetsialistyprivedut you to re-replacement or repair of the system, causing material damage