Pipes for heating

For heating systems on the market today offer metal, plastic and metal pipes. In principle, they are all perfect for heating. The main differences between them lie in the peculiarities of installation, the materials of which they are made, as well as durability and price of the pipe. For the device of the heating system may not be suitable all the pipes. For example, pipes that are designed for cold water, can not be used for heating. So the first thing to check with prodavtsaprezhde than buying a pipe - it permissible for a pipe flow temperature reaching 90 ° C. The second important criterion for selection - is the design pressure pipes for heating. After all, if the pressure in the heating system will exceed the allowable value, the tube may rupture, and hot water - fill the room. Unlike the pressure-rise buildings in the heating system of private dwellings are generally small - from 2 to 3 ATM, so for him this option is not critical. The third characteristic - the diameter of the pipe. It is chosen in such a way as to ensure easy connection to the radiators and the boiler. For district heating is also important so-called hydraulic resistance of pipes and the velocity of the hot water in the pipes. Therefore, the question about what to buy diameter pipe, it is better to see a specialist. As mentioned above, the pipes of different materials manufacturing (metal, plastic, PVC). Metal pipes perfectly withstand high pressure, durable and very cheap. They can be constructed in the wall. However, the metal tubes have a significant weight. In addition, when the heating device can not do without additional equipment - welders, grinders and cutting device for bending tubes. All this complicates and increases the cost of installation of pipes. There is another argument not in favor of metal tubes - corrosion, while not necessary to dismiss the problem of "fouling" pipe inside. Most private developers now prefer plastic and metal pipes as the operating conditions of the heating system in a private home rather comfortable. She did not threaten any excess coolant temperature, or incidental hammer. Plastic pipes "softer" than steel, and have several advantages. First of all, the inner surface of the plastic pipe is much smoother. On the walls of almost postponed the various salts. Hence, the risk of "overgrowing" plastic pipe from the inside lower. Also, plastic does not threaten corrosion. Another important advantage of the plastic pipe can be called the reduction of heat loss on the path from the boiler to radiators, heated room. Pipe: plastic or metal-plastic? Plastic pipe is about twice more durable than metal. In addition, the plastic system minimized the number of threads, and hence reduces the likelihood of leaks, which over time will inevitably come. The disadvantage of plastic pipe is a high coefficient of thermal expansion. This tube will change its size depending on the temperature of water passing through it. This means that when you install a plastic tube through a certain distance is necessary to provide so-called temperature compensators. They will save the pipe from damage during the heating or cooling. Compensators eliminates the need for the use of plastic reinforced pipes - they expand slightly, however, are on average 50% more expensive than conventional pipes. Other features of plastic pipe can be called the demands for quality installation, installer training and sensitivity to sunlight. Installation and repair of composite tubes is somewhat simpler. These tubes are changed slightly. Metal pipes can be bent at any angle, while installing a plastic pipe to use connecting the knee, but the linear dimensions are not important. Vulnerabilities metal-plastic systems - it's the joints, which arise periodically from leaking, and gaskets that need periodic replacement. Besides, plastic pipes in the average lifespan of up to 20 years, whereas plastic pipes - up to 50. Also, be aware of heat loss. To reduce them, you must use insulated pipes. Installation of any heating system - no easy matter, it is better doverit competent technician. This is especially true of plastic pipes. The same can be said about the calculation of the heating system. After mounting in any case, the test system at a pressure of 6.8 atmospheres for an hour, then another hour to keep the working pressure of, depending on the heating system - 2 to 4 atmospheres. Circuits supplying heat pipe layout on the house to radiators can be one-and two-pipe. According to the two-pipe circuit to each of the radiators summed up the two pipes: the "direct" - from the boiler and the "reverse" - the boiler. Under such a system is easier to regulate the temperature of coolant in each of the radiators. Two-pipe layout can be a collector or a "star" in which all "direct" and "reverse" piping consolidated into two combs attached to the boiler. The second type of two-pipe routing - Three-or-type "plume" when the boiler set aside two pipes - a "direct" and "reverse", which with the help of tees join all the radiators. The advantages of "star" wiring are an optimum temperature in each of the radiators, ease of temperature control, a simple calculation scheme, in which the diameter of pipes in the loop takes the same, ease of installation and hydraulic balance of the heating system. However, this system has a high cost, because its implementation requires a large number of tubes. Wiring "plume" is different from the "star" in that it requires less pipe, and as a consequence, it is cheaper. However, its significant negative - the lack of hydraulic stability. A combination of "star" and "tail". For example, each room of the comb fit two pipes and radiators they are joined on a "trail". When wiring single pipe hot water consistently "obbegat" all the radiators. Naturally, the first "on the fly sink to the most ardent, and the last - the coldest. In order to operate such a heating system and be able to temporarily disconnect the battery, let the replacement, provided the so-called bypass. They allow you to send some hot water to bypass the radiator. This setup requires the lowest cost of pipes, but due to the low efficiency of management and complexity of repairs in private homes is seldom used. For private housing is preferable to two-pipe layout with forced circulation by pump. It is this type of system provides high efficiency heating and easy temperature control in each of the radiators. Pipelines regardless of the type of wiring is most often placed in the floor in a layer of acoustic insulation, below screed and waterproofing. It is recommended to provide additional heating pipes insulated. In addition to its basic purpose, it protects the pipe from damage during installation.