In what polipropilenovy pipes win before the pipes made of other materials?
Russia takes the second place in the world after the United States till extent of the pipeline highways, statistically the length of the external pipeline reaches two million kilometers, and extent pozemny and internal, about fourteen million kilometers. However about 50 000 kilometers of the pipeline of da today is in a preemergency condition, and even more than five thousand kilometers of pipes was laid on an outcome of the last century. Thus, nearly a half of pipes which belong to housing and communal services system, need not only capital repairs, but also at least in their partial replacement.
One of the reasons of such disgusting condition of the Russian pipelines is that fact that in the majority of a pipe steel, and as it is known steel short-lived was thrown and term of its service fluctuates within ten - fifteen years.
Pipes of the last generation are made of the latest material – the polypropylene having a number of advantages before other materials, applied when manufacturing engineering communications.
Presumable service life of a polipropilenovy water supply system at supply of cold water makes more than fifty years, and is hotter – twenty five – thirty.
Thus, lines of operation of steel pipes expires several times quicker, than polipropilenovy. Thanks to the durability of a pipe from polypropylene promptly gain popularity to what the statistics in the field of their sales testifies. However today the market of plastic pipes is presented by quite wide range of materials of which they are made, besides old fifty years' prescription materials quietly compete to the latest development, moreover, they differ from each other not only the price, but also quality.
In spite of the fact that plastic pipes were invented about sixty five years ago, in the Russian market they are still perceived as a novelty. In this regard even experts, not always know from what party to them to approach, after all by and large we have yet no uniform systematized database containing about them objective information and technical characteristics that very much complicates a choice. Though it is possible to try to understand this difficult situation.
Today in the Russian market some main types of pipes made of plastic are presented:
- the polyvinylchloride;
- the polyethylene;
- the metalplastic;
Polyvinylchloride pipes appeared in the United States approximately in the mid-thirties the past century. Initially they were intended for small constructions and had restrictions in diameter. Moreover, connection of a fitting and pipes was carried out by means of special glue.
Today the European countries refused flatly application of polyvinylchloride pipes and for this purpose there are weighty reasons. First of all, over time polyvinylchloride starts to allocate actively the cancerogenic substances possessing a wide range of action. In the second, PVC is unstable to fire and during burning allocates poisonous gases deadly to the person – dioxides and oxides, in this regard pipes from polyvinylchloride can be seen only in the European sewer systems.
In Russia pipes from this dangerous material apply only underground and that, outside of buildings. At construction of high-rise buildings they proved from a negative side, without having sustained even a warranty period of operation.
Polyethylene pipes appeared slightly after the polyvinylchloride. Them started to let out in the mid-fifties of the XX century. The main advantage of these pipes was that they perfectly transfer low temperatures, to a minus of twenty degrees inclusive that allows to lay from and to maintain even in the conditions of severe Russian winter. Connect polyethylene pipes not chemical, and mechanically, by means of a polipropilenovy or brass fitting.
Apply them, as a rule, to supply of cold water. However polyethylene has also the shortcomings, he badly transfers a heat, bursts and cracks under the influence of solar therefore in case of application of polyethylene pipes with outside, polymer for stabilization fill with soot.
In the seventies there was the new type of polyethylene pipes "sewed". It differed from the predecessor immunity to temperature differences and special durability.
However as a result of a sshivka of linear molecules, the material ceased to cook, therefore for a sshivka began to use very dense polyethylene, and a sshivka to carry out in several ways: ionizing radiation, peroxide kremniyorganichesky substances. Pipes from the sewed polyethylene apply as to giving cold, and hot water. Moreover the "sewed" pipes equipped with "a kislorodozapirayushchy layer» can be applied in heating systems.
The following type of plastic pipes - metalpolymeric. They have five layers, besides the main layer is made of the "sewed" polyethylene on which the glue layer is put, then the foil, again a glue layer, and from above the polyethylene cover protecting a pipe from external influences is imposed thin, to 0,15 mm. Such method of creation of plastic pipes is called an ekstuziya method at which the tape of aluminum closing the main pipe, in a joint is ready ultrasound and becomes covered by glue on which impose some layers of polyethylene.
https://appdeveloper2017blog.wordpress.com/2017/03/27/finding-the-right-app-developer/ The pipes made in the similar way, factor of linear thermal expansion have in 5 times less than usual and as practically are not subject to oxidation. Moreover, metalplastic pipes perfectly bend and keep formed them, in this regard they can be used for creation of difficult systems on the configuration, for example for ля eyeliners to the thermal equipment and devices: to water heaters, radiators of a central heating also we designate. However and this, apparently, universal material has the shortcomings, the metalplastic pipe in diameter can be no more than forty millimeters that essentially limits a range of its application.
Pipes from polypropylene
And the last, the pipes made of a modern material - polypropylene. Unlike above listed pipes, polipropilenovy have a number of essential advantages:
- They are durable, the guaranteed service life of such pipes not less than fifty years;
- Polipropilenovye pipes do not need painting;
- They have low heat conductivity in this connection do not allocate condensate and do not demand isolation;
- At supply of hot water on polipropilenovy pipes loss of heat is much lower on ten, and even twenty percent are lower, than at water supply on metal pipes;
- A pipe and polypropylene are capable to sustain even emergency loadings as depending on pressure they heat up from 95 to 130 degrees Celsius, without destructive consequences for themselves.
- Due to the small weight of polypropylene, installation of polipropilenovy pipes manages much cheaper than the metal;
- They do not carry out an electric current;
- Are not subject to impact of corrosion in this connection passableness of a pipe in independence of term of its operation remains the former;
- On installation of polipropilenovy pipes of time goes to two, and even four times are less, than at installation of the metal;
- In polipropilenovy pipes there is no limy raid as they have a smooth and external and internal surface;
- Chemicals do not act on them, such as solvents, acids and other aggressive chemical reactants;
- As in polipropilenovy pipes there can not live bacteria, water, passing through them, does not change the qualities;
- Polipropilenovye pipes are silent and do not publish humming and howling sounds as it is done by the metal;
- At the expense of a smooth surface of pipes, speed of water flow practically does not decrease;
The most suitable raw materials for manufacturing of these pipes is polypropylene copolymer — type 3 (PPR 80) welt. It represents a strong and easy material – copolymer which treats thermolayers and possesses resistance to influence of alkaline and acid solvents. However special value of this material I represent its reactions on thermal influence, it is capable to maintain temperature from a minus 10 to 95 degrees Celsius. Besides thanks to the elasticity, the polipropilenovy pipe does not burst even then when water in it turned into ice.
Copolymer received during updating of polipropilenovy structure when substance molecules joined its molecule under the name ethylene, having given it elasticity, viscosity and ability to resist to temperatures.
Today scientists of the whole world recognized that propylene copolymer the best material for manufacturing of pipes. Its technical characteristics allow to use the pipes made of this universal material everywhere to use for creation of engineering networks. Most of all its small heat conductivity disposes to it, its factor is equal 0,23 W/m * to °C.
Moreover PPR is ecologically safe that is important at total environmental pollution. As it can be utilized without application of poisonous substances.
Where apply polipropilenovy pipes?
Them establish in household engineering systems for supply of cold and hot water, for providing a central heating, the sewerage and heating of floors. Each above-stated system has the distinctive features, in particular it concerns pressure and a temperature mode. These factors influence a choice of pipes for these or those communications, after all pipe service life depends on it.
The tubas which working pressure corresponds to indicators the 10th bar — PN10 quite will be suitable for supply of cold water not above twenty five degrees, and for hot - the 16th bar — PN16. For creation of systems of a central heating usually take pipes calculated on pressure the 20th bar — PN20 or the 25th bar — PN25. By the way, communications from polypropylene can include metal sites, details for connection of the pipes, made of polypropylene with brass shaving and supplied both external, and a female thread easily allow to connect a metal pipe to the plastic.
Plastic pipes of the last generation often use creations of sewer systems indoors, and as for removal of waste and soil waters.
However it is necessary to notice that polipropilenovy sewerages are calculated only on service of the small houses, separately taken apartment or a cottage.
Pipes from polypropylene as are used in drainage and irrigating systems for transfer of chemical structures and the compressed air.
Assembly of polipropilenovy pipes
Installation of systems from PPR of pipes differs the simplicity and in the high speed of performance of installation works as, polipropilenovy pipes, are much more rigid polyethylene and gather by means of every possible tees, corners and an other fitting. Pipe PPR after installation become not folding.
It occurs because they incorporate a diffusive method at temperature of two hundred sixty degrees, speaking in language of professionals the bell-shaped welding, allowing to do strong and tight connection. Besides welding becomes quickly enough and consists of three stages: are sharp, heating and connection. It should be notedIt should be noted that after the completion of welding the made system is already ready for operation.
When joining pipes of different diameter, as a rule, use a special fitting. A fitting made with an impregnation of brass elements, is applied when joining polipropilenovy pipes with metal mixers or cranes.