Range of pipes and fittings made of polypropylene. Polypropylene pipes

Evgeny Sedov

When hands grow from the right place, life is more fun :)

Content

Modern, affordable and reliable solution for centralized and decentralized systems - poly propylene pipes for heating (PPR, PPR), conventional or reinforced with fiberglass, aluminum. Such products are characterized by resistance to aggressive substances and chemical solvents, durability, they are not subject to corrosive processes, therefore polypropylene pipes are so popular for heating.

What are polypropylene pipes

Metal is replaced by more modern material- polypropylene for heating, which is a kind of thermoplastic polymer. Just ten years ago, products were made from pure material and did not have the best pressure and high temperature resistance. Today, the range of polypropylene pipes for heating has expanded significantly, each type has its own specifications.

Types

The characteristics of polypropylene pipes are determined by their type. Initially, PPR products were widely used - the most simple systems... Their declared service life is much lower than that stated, due to the temperature and pressure of the water, deformations occurred. Manufacturers modified the material and the following classification appeared on the consumer market:

PPH (type 1) is a homopolymer formulated for industrial piping, feed cold water and ventilation systems;
PPB (type 2) - random copolymer with polyethylene in structure, which can be used in cold water systems and floor heating systems;
PPR (type 3) - polypropylene with ethylene, which is characterized by high heat resistance;
PP-RCT (type 4) is a polymer similar to type 3, but with a denser structure, reinforced with aluminum or fiberglass.

Marking

Before purchasing, carefully study the markings on the first ones. The type must be indicated on the products: PPH, PPB, PPR, PP-RCT. 1, 2 types are not suitable for heating. Domestic manufacturers label products in accordance with GOST standards with an operation class. Only class 5 is suitable for the heating system, and classes 3 and 4 are also used for underfloor heating. Also on the side of the product is indicated operating pressure... The PN25 designation indicates that the pipe can withstand 25 atmospheres per day.

Manufacturers

On construction market presented polypropylene pipes for heating from all over the world. The sheer number of manufacturers and their products can mislead the inexperienced buyer. The choice should not be based on whether the product is cheap or expensive, whether there are promotions, discounts or sales for the material. The purchase must be based on the technical characteristics of the products and the reliability of the seller. Czech and German companies have earned particular trust of consumers.

Wavin

Builders and repairmen are likely to have heard about the high quality of Czech products from Vavin Ecoplastic. These products occupy leading positions in the ratings of online sanitary ware stores. Experienced craftsmen know where to order the products of this company from catalogs with mail delivery, so as not to overpay. One of the popular options is the following:

model name: Ekoplastik PN20 25x4.2;
price: 62 rubles per meter;
characteristics: 25 mm diameter, service life - 50 years, wall thickness - 4.2 mm, operating temperature - up to 700 ° C;
pluses: the presence of an oxygen protective layer;
cons: withstands pressure only up to 10 bar.

For solutions different tasks and operating conditions, Vavin manufactures several versions of its products. With significant loads on the system, experts recommend using the following form:

model name: Ekoplastik PN20 40x6.7;
price: 165 rubles / m;
characteristics: operating temperature - up to 700 ° C, allowable pressure - up to 20 bar, wall thickness - 6.7 mm;
pluses: withstands high pressure, suitable for central and local heating;
cons: high cost.

RVC

Polymer heating systems are a narrow specialization of the "Plastic" company, which manufactures products under the RVK trademark. The production is located in Russia, which provides an affordable cost of production. RVK are manufactured in accordance with European standards... Raw materials and equipment are imported from Europe.

model name: PP-pipe int. reinforcement with aluminum PN25 20X3.4 L2M RVK;
price: 58 rubles / m;
characteristics: wall thickness - 3.4 mm, diameter - 25 mm, inner reinforcement with aluminum, marking - PPRC, operating temperature - up to 900 ° C;
pluses: high permissible operating temperature, withstands high pressure;
cons: requires soldering during installation.

Heating using RVK products means low heat loss due to low thermal conductivity, long service life, and minimal pressure losses. The quality of Russian products is ensured not only by raw materials and technologies that meet standards, but also by specialists who are constantly improving their level, adopting the experience of colleagues from Europe. Fiberglass-reinforced products are reliable and inexpensive:

model name: glass fiber reinforced PN25 20X3.4 L2M RVK;
price: 49 rubles / m;
characteristics: operating temperature - up to 900 ° C, wall thickness - 3.4 mm;
pluses: affordable price, ability to withstand high temperatures and pressure;
cons: requires soldering during installation.

Prices for polypropylene pipes and fittings from the Russian company Pro Aqua are affordable, while the quality remains at the same level. One of the main advantages of Pro Aqua products is durability. Under normal operating conditions, the manufacturer promises a 50-year guaranteed service life. Resistance to aggressive media, alkalis, high pressures and temperatures is required for the use of products for central heating circuits:

model name: PN25 stabi. Pro Aqua 20 mm;
price: 83 rubles / m;
characteristics: aluminum reinforcement, pressure up to 20 bar, operating temperature - up to 900 ° C, service class - 5;
pluses: impact resistance, bendability, high permissible operating temperature;
cons: welding is required for installation.

Three-layer polypropylene pipes reinforced with fiberglass are one of the achievements of Pro Aqua. The main advantage of such products is a low coefficient of linear expansion, which is especially important when arranging heating units. One of the popular options for fiberglass-reinforced products is the following model:

model name: RUBIS SDR7.4. Pro Aqua 25 mm;
price: 82 rubles / m;
characteristics: nominal pressure - 25.7 bar, operating temperature - up to 900 ° C, service class - 5;
pluses: low coefficient of linear expansion;
cons: with prolonged contact with the sun's rays, the destruction of products may occur.

The German company Banninger supplies the market with PP-RCT polypropylene products for heating and plumbing. Banninger polypropylene pipes are available in green or white. The products are characterized by high resistance to acids and alkalis. High quality products allows you to use it not only in household but also on an industrial scale. The budget version of the product has won popularity among consumers:

model name: Banninger PP-RCT PN16 20x2,3
price: 53 rubles / m;
characteristics: working temperature - up to 700 ° C, working pressure - 16 bar, wall thickness - 2.3 mm;
pluses: affordable cost;
cons: low permissible temperature.

There is another option:

model name: Banninger PP-RCT Watertec PN20 32x3.6;
price: 180 rubles / m;
characteristics: fiberglass reinforcement, working temperature - up to 700 ° C, working pressure - 20 atmospheres;
pluses: low coefficient of linear expansion, tear resistance, good thermal insulation qualities, minimizing losses from the coolant;
cons: low operating temperature.

The German company Wefatherm is engaged in the production of systems for plumbing and heating. The peculiarity of Wefatherm is the perfect smoothness of the inner surface. This property helps to minimize pressure loss. Experts say that the products of this company are characterized by excellent resistance to pressure and temperature changes.

Per long period the existence of the company was confirmed by the wear resistance, durability of pipes from a German manufacturer. Special attention deserves the fact that the products are resistant to sunlight. For heating systems, it is often used:

model name: Wefatherm Stabi SDR 7.4 PN 20 32 X 4.4;
price: 440 rubles / m;
characteristics: PP-RCT, operating temperature - 700 ° C, permissible increase - up to 1000 ° C, diameter - 32 mm;
pluses: reliability, durability, resistance to chemicals and sunlight;
cons: high price.

One of Wefatherm's unique developments, which is becoming more and more popular, is fiber reinforcement. Such systems are easy to install, the material does not delaminate during operation. Such products are characterized by exceptional smoothness of the inner walls. Low coefficient of thermal expansion, environmental friendliness, high chemical resistance make fiber-reinforced products ideal for heating systems. The only drawback is that the price of the products of the German manufacturer is too high:

model name: SDR 7,4 Faser PN20 Wefatherm 90 х 12,3 mm
price: 604 rubles / m;
characteristics: fiber reinforcement,
pluses: simplified installation, pipes do not delaminate when exposed to high temperatures, exceptional smoothness of the walls, which ensures minimal pressure loss;
cons: thermal expansion is higher than that of glass-reinforced models, high price.

Heisskraft

Heisskraft is a Russian company. The manufacturer claims that the pipes are manufactured in Germany, but the plant is located in Pushkino, Moscow region. Although this deception of the manufacturer has already ceased to be a secret, PT Heisskraft continues to be popular with consumers, because the quality of the products is at a decent level.

The peculiarity of Heisskraft is that it contains technical soot. The substance has established itself as an excellent stabilizer for such products, therefore, it improves the technical characteristics of the product.

model name: KraftStabi S3,2 (SDR7,4) PN16;
price: 52 rubles / m;
characteristics: reinforcement with aluminum foil, up to 900 ° C;
pluses: affordable price, resistance to chemicals, no need to use metal fittings during installation;
cons: the process of destruction begins with prolonged contact with sunlight.

For hot water systems, centralized and decentralized heating systems, Heisskraft has developed the FestFaser thermo-stabilized glass fiber reinforced pipe. Such systems are used in multi-storey construction.

model name: FestFaser (SDR 6) PN 25;
price: 520 rubles / m;
characteristics: PN 25, T max 95 ° C, SDR 6;
pluses: stability and safety of characteristics under prolonged exposure to hot water, minimal linear expansion, material is not prone to delamination, increased strength;
cons: high cost.

How to choose polypropylene pipes for heating

On the modern Russian market, polypropylene pipes for heating are offered by dozens of companies from all over the world. Sorting out the widest range can be tricky. The main thing is to pay attention to the characteristics of polypropylene and the reputation of the manufacturer, because the manufacturer's statements do not always correspond to the real state of affairs. Before purchasing polypropylene products, consider the following selection factors:

Operating pressure. The number in the marking should be slightly less than the system requires.
Temperature. The pipe must be designed for hot water, otherwise it cannot be used for heating.
Reinforcement. This factor is optional, but it is better to choose models of polypropylene products with such an advantage. Reinforcement can be fiberglass or aluminum.
Diameter. The indicator for this parameter cannot be less than the internal section of the risers.
Manufacturer. When buying, it is important to take into account who manufactures the products. Companies that have been in this segment of the market for a long time and have earned the trust of consumers are preferable to little-known one-day ventures.
Price. This point does not mean that it is worth chasing the lowest price and buying the cheapest products. It is unlikely that a pipe "for three kopecks" will be reliable and durable. Choose the right price-performance ratio so that your products last a long time and withstand all the loads.

Polypropylene pipes, widely used for the installation of heating systems, cold and hot water supply, as well as other engineering systems, are represented by a fairly wide range. Different types products have various characteristics and scope of application. Therefore, when choosing pipe products, it is important to understand which polypropylene pipe is best suited for certain purposes.

Features of marking polypropylene pipes

To choose the right types and characteristics of PP pipes, you need to pay attention to their marking. First of all, you need to pay attention to the designations that characterize the working pressure and temperature of pipe products. The current standardization system classifies polypropylene pipes into 4 groups:

PN10 - polypropylene pipes designed for an operating pressure of 10 atmospheres and an operating temperature of up to +45 ° C. These products have thin walls and can only be used to transport cold liquids;
PN16 - PP pipes designed for operating pressure up to 16 atmospheres and operating temperature up to +60 ° С. Not intended for hot water supply and heating systems;
PN20 - polypropylene pipes designed for operating pressures up to 20 atmospheres and operating temperatures up to 95 ° С. They can be used in heating and hot water supply systems, however, due to significant temperature deformation, their use in these systems is limited;
PN25 - polypropylene pipes designed for operating pressures up to 25 atmospheres and operating temperatures up to 95 ° С. Polypropylene pipes PN 25 are produced in a reinforced design. A layer of aluminum foil or fiberglass serves as a reinforcing element. The use of an additional reinforcing layer significantly increases the strength characteristics and reduces thermal deformation. Thereby reinforced pipes ideal for heating and hot water supply.

Advantages and disadvantages of polypropylene pipes

When installing heating systems, the question often arises as to which pipes are better: polypropylene, metal-plastic or metal. To determine this issue, it is important to take into account all the advantages and disadvantages, as well as the characteristics of polypropylene pipes.

The main advantages of reinforced polypropylene pipes are their following features:

It is also necessary to consider the disadvantages characteristic of pipes made of this material. The main disadvantage for heating systems is, of course, the high value of the coefficient of linear expansion. This can lead to deformation of the pipelines and their exit from the fasteners, which is often accompanied by depressurization at the joints and causes leaks. In this regard, it is recommended to use reinforced PP pipes, in which the coefficient of thermal expansion is significantly lower. However, reinforcement does not completely eliminate thermal deformation, therefore, the installation technology provides for the installation of attachment points and expansion joints at certain intervals.

Another disadvantage is that polypropylene pipes are not subject to deformation during installation. Therefore, special fittings are necessarily used to perform turns. In addition, it is important to take into account the negative effects of solar radiation, which can cause accelerated aging of the material, when performing installation work and placing pipelines.

In general, we can say that the ratio of the advantages and disadvantages of polypropylene pipes determines their high efficiency when used as part of heating systems, as well as in other engineering networks.

Features of the choice of polypropylene pipes

When choosing polypropylene pipes, four main parameters must be taken into account:

maximum operating temperature;
maximum working pressure;
diameter;
coefficient of linear expansion.

The values of these parameters should be related to the purpose and operating conditions of the pipelines to be installed.

The maximum operating temperature makes it possible to use pipes of a certain brand for completing engineering systems for a specific purpose. So, pipes PN10 and PN16 can only be used for transporting cold water. PN20 products can be used for hot water systems, and PN25 pipes are best suited for heating.

For household systems pipes with almost any working pressure can be used. However, the value of this parameter, especially in combination with temperature, directly determines the service life of the products. That is why, for operation as part of a heating system, it is necessary to choose pipes designed for the highest working pressure.

The diameter of a polypropylene pipe determines its throughput, which determines the possibility of using it in certain conditions. For example, a 32 mm or 40 mm polypropylene pipe is used for the installation of risers. Internal wiring is used with a 20 mm polypropylene pipe. Also for the same purpose, polypropylene pipes 25 mm can be used.

The coefficient of linear expansion is an important parameter that determines the degree of change in the geometry of the product under the influence of high temperature. Depending on this coefficient, the possibility of using pipes for heating or hot water supply, as well as the method of their installation, is determined. So, PN20 pipes have a higher coefficient of linear expansion, so they are not allowed to be laid closed way... Deformation of the pipe when it is heated can lead to destruction of the plaster. At open way gaskets require more frequent installation of fasteners and expansion joints. PN25 have a much lower coefficient of linear expansion, which allows them to be installed both inside walls and outside.

Range of polypropylene pipes

Depending on the composition of the material, the following types of polypropylene pipes are distinguished:

PPH is a hard plastic polypropylene homopolymer. It has a weak resistance to high temperatures, therefore it is used exclusively in cold water supply networks, in ventilation and air conditioning systems;
PPB is a complex block copolymer of polypropylene and polyethylene. Differs in high elasticity, has sufficient temperature resistance. Thanks to this, PPB pipes can be used for the installation of underfloor heating. They are also used in water supply networks, ventilation systems, industrial pipelines;
PPR (PPCR) is a random copolymer of polypropylene, in the molecular chain of which ethylene molecules are present. Pipes made of this material can be used as part of hot water supply and heating systems at a maximum coolant temperature of up to 70 ° C.
PPs. Flame retardant polypropylene homopolymer. The most suitable material for the production of pipes for heating systems. Withstands operating temperatures up to 95 ° C.

Color of polypropylene pipes

Polypropylene pipes can be produced in four color options: white, gray, black, green. The color depends on the composition and properties of pipe products, which determines the scope of its application.

White and gray pipes are widely used for the installation of almost all utilities, including heating and water supply systems. A limitation in the use of white pipes is their low frost resistance, which does not allow their use in outdoor conditions.

As for gray pipes, they have the following advantages:

ability to withstand significant working pressure;
high chemical and temperature resistance;
significant durability;
easy installation by soldering.

Black polypropylene pipes are used for the installation of sewage systems and drainage systems... Thanks to the use of special additives, they have the following features:

high resistance to aggressive substances;
increased strength characteristics;
UV resistance;
long service life.

Green pipes are the cheapest type of product. They are used in private homes and summer cottages for irrigation systems.

Corrugated polypropylene pipes

Corrugated polypropylene pipes are a special type. They are used to create sewerage systems, drainage systems, storm sewer, drainage. Modern products of this type are designed to receive Wastewater with temperatures up to 60 ° C, and with short-term exposure up to 100 ° C.

Today, two-layer corrugated polypropylene pipes are produced. They have the following advantages:

high chemical resistance;
increased level of ring stiffness;
excellent dielectric properties;
maintaining high throughput throughout the entire service life;
high resistance to abrasive wear;
long service life.

Features of the installation of polypropylene pipes

Installation of polypropylene pipes is performed by thermal polyfusion. Its essence is in heating the parts to be joined using a special soldering iron to a temperature of about 260 ° C, after which they are quickly connected.

When brazing polypropylene pipes, it is very important to observe technological requirements by heating time, which depends on the following factors:

the diameter of the pipes to be connected;
temperature environment;
width of the welding belt.

Heating provides the necessary plasticity of the material, which is maintained for several seconds. Therefore, it is very important to quickly fix the joint assembly, while ensuring correct location mating parts. It is also important to avoid excessive heating, which can lead to deformation of the pipes.

Optimal time heating when welding polypropylene pipes of different diameters:

with a diameter of 20 mm: 8-9 seconds;
with a diameter of 25 mm: 9-10 seconds;
with a diameter of 32 mm: 10-12 seconds.

The same time is needed to fix the connection. If this requirement is violated, deformation of the connection may occur, which will lead to its depressurization.

Sale of polypropylene pipes

The Lammin trademark sells polypropylene pipes and fittings from the manufacturer in bulk. Here you have the opportunity to order a wide range of products of excellent quality, perfectly adapted for durable and reliable operation in heating systems. At the same time, we have favorable prices for.

And high performance characteristics polypropylene pipelines in water supply and heating systems - only the upper part of the iceberg. For the correct operation of the installed communications, it is not enough to choose the type of polymer pipe and buy material in the right amount- preliminary design sketches are required, and for large objects - serious thermal and hydraulic calculations. For the heating system to be effective, polypropylene pipes for heating must have a diameter confirmed by these calculations.

Let us consider in more detail the significance of the size of the diameter of polypropylene pipes in the construction of pipelines.

Pipe material for communications. What are the parameters of the pipe

Questions of how the water supply system should look like, what diameter of pipes should be in the main supplying heat, are solved at the stage of designing life support systems in the house. As a result, the diameter of polypropylene pipes for water supply can often differ from the identical size of the heating system pipeline, since these communications have miscellaneous purpose and therefore are exposed to various factors.

On a note: if the boiler water supply rate in the heating system pipeline is less than 0.2 m / s, then there is a high likelihood of airing the line, and exceeding the supply rate by 0.2 m / s will lead to an increase in costs - the costs of equipment exposed to heavy loads will increase.

The use of polypropylene products has greatly simplified the work on equipping residential buildings with water heating and water supply systems. However, you need to know exactly which type of polymer pipe material is suitable in a particular case. The types of polypropylene pipes that exist today have different technical characteristics and are designed for a specific area of use.

The most reliable products for the installation of hot water heating pipelines and hot water supply systems (DHW) are PN25 or PN30 products. It is these brands that are able to withstand pressures up to 25 and 30 atm. respectively, at the operating temperature of the coolant 95 0 C. Even short-term operation of such pipes at a water temperature of 120 0 C is allowed, since distinctive feature these products are thick walls.

Samples of polypropylene pipes reinforced with aluminum.

For cold water supply, polypropylene pipes with a uniform wall are used. For DHW systems and heating circuits, reinforced products are used, since the inclusion of an aluminum shell in the structure of the wall of a polypropylene pipe or significantly increases the strength of the pipe material and reduces the amount of thermal expansion.

For reference: thermal expansion is 0.03 mm / m 0 C, while for channels with a wall of homogeneous polypropylene this value is about 0.15 mm / m 0 C. Based on this, homogeneous products are suitable for cold water supply, and for systems heating and hot water supply, only reinforced polypropylene is used.

What diameters are polypropylene pipe materials produced?

When choosing components for a heating and water supply system, the decisive factors are the temperature of the liquid, its flow rate and pressure. The required cross-sectional area of the water supply system is determined in this case by calculations performed in accordance with the scope and operating conditions of the equipment.

Based on the configuration of the pipe section (circular ring), its geometric parameters are determined by the outer and inner diameters. The current classification of polypropylene pipes clearly defines the typical dimensions of each type of pipe products used for installation.

To date, both domestic and foreign manufacturing firms produce components for pipelines in a standard design. Taking into account practical application standard engineering solutions have been developed to determine the optimal passage in products for home heating and other water communications. Based on the data in the table, you can make the right choice of equipment and components for the heating main without resorting to hydraulic calculations.

As a rule, the marking contains one of the following values for the outer diameter:

16, 20.25, 32 and 40 mm,

which correspond to the inner diameters of PN25 polypropylene pipes:

10.6; 13.2; 16.6; 21.2; 26.6 mm.

For ease of use, the correspondence of the diameters and wall thickness of polypropylene pipes used in heating and water supply systems are summarized in the table:

Table with data on the diameters and wall thickness of polypropylene pipes used in everyday life

A reasonable question. Why on finished products external parameters are applied, if the size of the internal passage of the pipeline is so important for functionality. The thing is that outside diameter indicates the appropriate type of connection.

Potential of using polypropylene pipes of various outer diameters at a speed of movement of the coolant in the pipeline 0.7 m / s:

a pipe with a diameter of 16 mm is designed to connect one or two heating radiators;
a value of 20 mm corresponds to connecting up to 5 radiators with a total power of up to 7000 watts);
for a larger number of radiators (with a total power of up to 11 kW), propylene polymer pipes with an outer diameter of 25 mm are used;
polypropylene pipe material with an outer dimension of 32 mm is designed for equipping a house as a whole or one floor with a heating system of 10-12 kW of total power (maximum 19 kW);
products with a diameter of 40 mm are used for laying trunk pipelines in residential buildings of a large area. Usually these are cottages and country houses, in which the number of heating devices reaches 20 pieces, and the total power of all connection points is approximately 30 kilowatts.

Influence of the pipe diameter on the performance of the heating system

The rate of supply of the coolant and the amount of transferred thermal energy directly depends on the inner section of the polypropylene pipelines. For clarity of this statement, the dependence of the provision of thermal energy on the intensity of the coolant supply and the values of the pipeline diameters is summarized in the table:

Selection table for polypropylene pipe material depending on the intensity of the heat carrier supply and the need for thermal energy

Thermal power is indicated in W, heat carrier flow rate in kg / sec. The calculated data are based on average temperatures: the supplied heat carrier at 80 0 С, return flow at 60 0 С, air in the room +20 0 С.

For example: at a flow rate of 0.4 m / s, the following amount of heat energy will be transferred in the pipeline:

for a line with an outer size of 20 (inner section 13.2 mm), the amount of heat is 4.1 kW;
for propylene products Ø 25 and 16.6, respectively, the amount of heat will be 6.3 kW;
propylene pipelines with outer and inner diameters of 32 and 21.2, respectively, have a heat energy supply of 11.5 kW;
pipe materials of 40 millimeters (size of the inner lumen 26.6 mm) will provide a heat supply of 17 kW.

With an increase in the flow rate of the liquid to 0.7 m / s, the flow rate of the coolant will immediately increase by 70-80%.

Important! The practical purpose of the above table is to recommend, based on the value of the required amount of thermal energy, the required pipe diameter during the selection of pipe materials for a residential heating system.

Let's look at an illustrative example:

There is typical house useful area of 250 m 2. The building is sufficiently insulated and in order to create normal living conditions it needs heating at the rate of 1 kW per 10 sq. m, that is, to create a comfortable temperature in the house, 25,000 watts of thermal energy (maximum) will be enough.

On a note: more heat is always required for the first floor - about 2/3 of the total consumed amount.

Thus, out of 25 kW, heating the first floor will require 15 kW, the second - 10 kW.

House equipped autonomous system heating on the basis of a double-circuit boiler. The radiators installed in the rooms are connected in parallel. The house has a wiring for two wings with equal heat output. On the ground floor, the power for each wing is 7,500 watts. For the second floor, both wings require 5000 watts.

Two-storey house with a hot water heating system based on an autonomous boiler - sectional view

The boiler produces 25 kilowatts of thermal energy for heating the house. This means that for the heating main it is necessary to use polypropylene pipes and fittings with an inner diameter of 26.6 mm (at a feed rate of 0.6 m / s). This value corresponds to the outer diameter of the pipe 40 millimeters.

To supply the branches on the ground floor, 1500 watts of heat will be required. Using the data from the table, we get the following:

at a flow rate of 0.6 m / s optimal diameter the internal lumen of polypropylene pipes will be 21.2 mm - the corresponding external parameter corresponding to this value is 30 mm according to the table;
for each wing, a pipe material with an inner diameter of 16.6 mm is suitable, which corresponds to a Ø 25 mm of the outer contour of the cross-section of polypropylene pipes.

Now we will consider the procedure for connecting heating devices.

Water heating radiators have an average power of 2 kilowatts, therefore, theoretically, pipes with a minimum outer diameter of 16 mm (PN16) are suitable for inserting them into the circuit. However, in practice it is recommended to use polypropylene products with an internal section of 13.2 mm and an external diameter of 20 mm (PN20), since the application polymer pipes PN16 was found to be impractical due to its low manufacturability.

The second floor is equipped with a 32 mm pipeline. Pipes and connecting fittings Ø25 mm are used for each wing. With radiators, the picture is the same as on the first floor - the batteries are connected using PN20 pipes.

Conclusion

Based on the above example, for each section of the pipeline in the heating system, it is possible to select components of the required diameter - including the efficiency of the heating equipment will depend on this.

It should be remembered that the materials for the piping in the heating system are selected in accordance with the maximum technical characteristics of an autonomous boiler, despite the fact that in most cases the unit will operate normally - in accordance with given parameters exploitation.

This article will present polypropylene pipes for water supply with a description of their main properties, types and applications. As well as metal-plastic pipes, or a heating system made of polypropylene pipes can even be done by an unskilled person. It is enough to get the necessary minimum of knowledge so that the quality and appearance of pipelines in your house, bathhouse or other individual buildings would meet the highest requirements.

Properties of polypropylene pipes for water supply

Recently, the installation of polypropylene water pipes received wide use during construction individual houses... This is explained by the availability and low price of all components, simplicity and reliability of installation, long service life (over 50 years), absence of corrosion and growth, attractive appearance, the ability to use in heating systems, hot, cold and drinking water supply.

Depending on the modification of polypropylene, three types of pipes are produced:

From a homopolymer - PP-H (according to the European classification), corresponds to PP-G and PP type 1 according to the Russian classification;
From block copolymer - PP-8 (PP-B and PP type 2);
Made of random copolymer - PP-R (PP-R and PP type 3).

According to GOST R 52134 -2003, which regulates the use of thermoplastic pipes, all three of the above types of polypropylene can be used in the production of pipes for water supply and heating. The standards of countries such as Germany, Great Britain and the USA also allow their use for pipelines, taking into account all sanitary and hygienic requirements.

In accordance with the purpose of the water supply system, the following classes of polypropylene pipes are produced:

Pipe class	Working temperature max, ˚C	Application
		For cold water supply
		Hot water supply
		Hot water supply
		Low temperature underfloor heating
		High temperature underfloor heating, low temperature radiator heating
		High temperature radiator heating

According to their structure, polypropylene pipes are produced both from a solid material and reinforced with aluminum or fiberglass. Pipes made of solid polypropylene are used only in hot and cold water supply systems, and water supply from, and reinforced ones can be used in all systems, including radiator heating.

Compared to solid pipes, reinforced pipes have a significantly lower temperature elongation. So, for pipes reinforced with fiberglass, it is half as much, and for aluminum - four times. The perforated aluminum interlayer reliably protects against harmful diffuse penetration of oxygen through the pipe walls into the coolant or water. These factors are especially important for heating closed view with a long length of pipelines, when the amount of oxygen in the water can reach such a value that it will harm plumbing equipment.

As a rule, the marking of the pipe should contain the value of the internal stress in MPa (1 MPa≈10 kg / cm²). For example, PP-R 63, where the number "63" means an internal stress of 6.3 MPa in a pipe at 20 ˚C, at which the manufacturer guarantees that it will not collapse for at least 50 years. This property of a polypropylene pipe is called minimum long-term strength and is denoted as MRS (Minimum Required Strength). The higher this figure, the stronger the pipe. Therefore, it must be borne in mind that an incorrectly selected pipe may not withstand the guaranteed service life.

In addition, polypropylene pipes can be classified into the following categories:

	Working pressure, MPa	Application area
		Cold water supply up to +20 ˚C, underfloor heating up to +45 ˚C
		Cold water supply with high blood pressure, hot water supply up to +60 ˚C
		Suitable for cold and hot water up to + 80 ˚C
		Reinforced aluminum pipe for hot water and heating at a temperature of +95 ˚C

The color of polypropylene pipes does not indicate their technical characteristics and scope. Depending on the manufacturer, it can be like this:

Gray;
White;
Green;
Black;
With a red stripe.

Selection and use of polypropylene pipes for water supply

The scope of application of polypropylene pipes in individual houses, baths and outbuildings is extensive - from hot to the arrangement of radiator and floor heating systems. With their help, you can connect to pipelines made of various materials: steel, copper and metal-plastic. Their long service life allows them to be laid with confidence in both open and closed systems.

How to choose the right polypropylene pipes

However, it is important to make the right choice in the wide range of pipes offered by many manufacturers. Here are some criteria to follow when buying them:

The pipes must correspond to the parameters of the plumbing or heating systems;
For a high-quality assembly of pipelines, all their components must be from the same manufacturer. Only then can we talk about the reliability and durability of the installed water distribution system;
When buying, be sure to evaluate the quality of pipes and fittings:

smoothness of the inner and outer surfaces;
the presence of cracks, chips, bubbles, structural heterogeneity, foreign inclusions;
right geometric shape on the outer and inner diameter of the pipe;
absence different thickness walls.

Considering that polypropylene pipes can withstand temperatures no more than minus 20 ˚C, you should ask the seller about the conditions of their storage in winter time of the year. Improper storage can lead to irreversible processes in the pipe material and, as a result, to a defect in the work done.
If provision is made for drinking water, then it will be useful to familiarize yourself with the quality certificate for the compliance of the pipe with sanitary and hygienic standards.
So that there are no additional difficulties when installation works, select only straight pipes. In stores, they are often stored upright, which leads to bending, sometimes quite significant.
Buy pipes only from well-known manufacturers that have proven themselves with better side and providing certificates of conformity to the declared quality. For example, domestic Sinikon, FD Plast, Valtec and Ikaplast or foreign Ostendorf, Valsir, Firat.

Range of polypropylene pipes, mm

Note: PN25 pipe is made with a reinforcing aluminum layer, which can be a simple or perforated interlayer with through holes. The perforated layer provides reliable connection all layers without the use of glue. The aluminum layer can be either offset to the outer surface of the pipe, or symmetrically relative to the inner and outer surfaces. This only affects the pipeline assembly process, which will be discussed in the corresponding article.

What VALTEC offers:

Which is better - polypropylene or metal-plastic pipes

And in conclusion, a few words in favor of the choice exactly polypropylene pipes for all pipeline systems.

Today, polypropylene pipes (PP) are considered the best pipe products among specialists. They have good technical and operational characteristics and differ in their purpose, color, quality and scope. They are used for laying both indoor and outdoor engineering communications.

Polypropylene pipe marking

When choosing polypropylene products, attention is primarily paid to the markings applied to them. This is due to the fact that the technical characteristics of different modifications may differ markedly. For example, not every polypropylene pipe is suitable for systems operating at high temperatures and elevated pressures.

The current classification of polypropylene products suggests their division into 4 groups. These types of polypropylene pipes are marked with two Latin letters PN and two digits, which make up a number indicating the pressure value for which PP pipes are designed.

Let's figure out what pressure polypropylene pipes withstand, and what characteristics they have various groups material.
These values are applied to the surface of the product:

PN10... If the system is constructed from products of this group, then it is able to withstand a pressure not exceeding 10 atmospheres. Moreover, the maximum temperature regime the working environment cannot be over 45 degrees Celsius. Using pipes of this type, they equip communications capable of transporting extremely cold liquids. Since this pipe product has thin walls, it is not widely used in the construction of internal water supply systems.
PN16... The presence of such symbols means that polypropylene pipes can withstand a pressure of no more than 16 atmospheres and a liquid whose temperature does not reach 60 degrees can move through them. These products are used for laying cold pipelines. Products of the PN16 group have a high deformation rate under the influence of high temperatures, which is unacceptable when creating pressure pipelines that provide hot water supply or heat supply.
PN20... As evidenced by such marking, pipe products can withstand a pressure of about 20 atmospheres (read also: ""). Can move on it hot water, which has a temperature of up to 95 degrees. Technical parameters of polypropylene pipes of this group allow them to be used in supply systems hot water... Currently, they are practically not used due to the occurrence of significant deformation in pressure-type heating structures. When moving along such a PP pipe under a high pressure of a liquid having the maximum permissible temperature, the product begins to lead and bend.
PN25... Pipes made of polypropylene with this marking are complete products for laying heating systems. They can easily maintain a pressure of 25 atmospheres. In their production, a composite material is used together with reinforcing inserts made of nylon fiber or aluminum foil. An interlayer of them reduces thermal deformation and increases the strength of the pipes. PP products with PN25 marking are widely used in pressure pipelines. Heat loss in them is 2 times less than in other types of pipes.

Advantages and disadvantages of polypropylene products

It is the properties of polypropylene pipes that make them in demand among developers, both multi-storey buildings and small country houses.

Among the positive features of polypropylene products, it should be noted:

Long service life of approximately 50 years. When pipes are used in cold water systems, manufacturers claim they can last up to 100 years.
Solid deposits do not collect on the inner surface of the product, since a special processing technology is used at the production stage.
Lack of condensation and frost resistance due to low thermal conductivity.
Low weight of polypropylene pipes, which is 9 times less than that of metal products.
Easy assembly and transportation.
Anti-corrosion resistance.
No additional maintenance required.
Resistance to aggressive chemical environments.
Elasticity.
Inexpensive cost. You can purchase pipes in different price categories.

In addition to the advantages, polypropylene pipes have disadvantages:

High degree of linear expansion. If PP products are not reinforced, an expansion joint for polypropylene pipes must be used during installation.
Insufficient heat resistance. Regardless of the choice of the type of pipes, it is necessary to insulate them, especially for the arrangement of heat supply systems.
To change the direction of the pipe laying, you will need to use special fittings.
Poor resistance to direct sunlight. Its negative effect can cause aging of the material and thereby reduce the service life of polypropylene products.

Since the degree of linear expansion is quite high, during the installation of the pipeline, the sagging of the PP pipes must not be allowed - for this, the attachment points on the wall should be located with small gaps.

PP pipe selection process

In order to select these products without error, four important points should be considered in addition to the product labeling, which was described above:

Maximum permissible temperature... It has already been said that for heating systems the best choice there will be products with PN25 symbols, for hot water supply - PN20 and for cold water supply structures - PN16.
Diameter... The section is selected taking into account the technical parameters that the pipeline should have. The optimal choice for wiring in apartments is considered to be pipes in which this parameter is 20 or 25 millimeters, for arranging drains - 32 or 40 millimeters. PP pipe of large diameter with thick walls is used for laying main pipelines, which are located in basements apartment buildings.
Maximum allowable pressure... If it comes about domestic use, then all pipes are suitable, including products of the PN10 brand. The duration of their service is directly related to the pressure in the line and the temperature regime of the working environment. For example, if the temperature of the liquid is kept for a long time at around 95 degrees, at constant pressure the products will last no more than 5 years, and if the water temperature is about 20 degrees and the pressure is 10 atmospheres - almost 50 years.
Thermal expansion coefficient... Products made of polypropylene are distinguished by their ability to change their geometry, provided that water at a high temperature is transported. These changes relate to the thickness of the pipe walls, and this is very critical for the throughput of pipelines.

Experts do not recommend laying products with PN20 marking in a closed method, since as a result of their deformation, cracks will appear in the plaster layer. As for the application of PN25 products, it can be mounted in both ways - open and closed.

Open option will not worsen the interior of the room, since the PP reinforced pipe holds its shape well and does not need to be bent. Thus, the method of laying a hot water supply system depends on the coefficient of linear expansion of polypropylene pipe products.

Range of polypropylene pipes

In the world market, PP pipes are presented in the following assortment.

PPH - type 1... These polypropylene products are considered the simplest of the entire range of products manufactured by modern industry. Their scope of application is the laying of cold water supply structures, ventilation systems, industrial pipelines.

PPB - type 2. This variety pipe polypropylene rolled products are made from a complex block copolymer. Such products are used in the arrangement of pressurized systems for supplying cold liquids and heat supply. Also, these products are used in the production of impact connecting elements with high strength.

PPR - type 3... Specifications PPR pipes based on the fact that a random copolymer is used for its production. Its introduction into industrial production was of global importance. Initially, it had the abbreviation PPRC - polypropylene random copolymer, later it was shortened to PPR (read: ""). Of the products related to this variety, cold and hot water supply systems are laid. It is these products that are used to create a warm water floor.

This molecular structure provided the following characteristics of the PPR pipe:

Highest strength and heat resistance compared to other types of polypropylene;
chemical resistance to various acids and alkalis;
unlike PPH and PPB products, this material is able to withstand the temperature regime of the working environment for a short time up to 140 degrees and in a constant mode up to almost 90 degrees;
frost resistance - products completely restore their shape after exposure to negative temperatures.

The technical characteristics of PPRC polypropylene pipes have made them an alternative to galvanized metal products. Among them there are products that are reinforced with aluminum or fiberglass.

PPs - type 4... The raw material for the production of these products is a highly flammable high-strength polymer. The maximum allowable temperature of the working environment of these PP pipes is 95 degrees. Experts consider them to be the best option for unreinforced single-layer products for heating systems.

Polypropylene pipe color

Polypropylene tubular products are produced in four colors.

Description of polypropylene pipes different color will help you make the best choice:

White PP products... They are used when installing plumbing systems. They are easily assembled by welding, so the work can be completed in no time. White propylene pipes are not recommended for outdoor use and at low temperatures. Products should be transported with extreme caution, since any physical or mechanical impact on them can cause damage. PP pipe has many advantages: long service life, ability to withstand pressure of 25 bar, corrosion resistance, affordable cost.
Gray pipes... These polypropylene products are often used in the installation of plumbing and individual and centralized heating systems. Their main technical characteristics: thermal and chemical resistance, long-term operation, environmental friendliness, tightness, etc. They are securely connected with a soldering iron.
Black PP pipes... Experts recommend using them when arranging sewer communications and drainage structures. In the production of these products, special additives are used that improve them. technical specifications... Black pipes have a number of advantages: resistance to UV radiation, various aggressive media and drying out; high strength.
Green polypropylene products... Pipes of this color are chosen for the installation of irrigation and irrigation systems backyard territory... They are inexpensive and therefore the owners of summer cottages and vegetable gardens prefer not to pay attention to their low strength characteristics. Green PP pipes do not respond well to physical influences, including system pressure. After installation during operation, you need to regularly monitor the state of communications, since the risk of pipe breakage is quite large.

Corrugated polypropylene pipes

This type of pipe products is used to create utilities for drainage and sewerage, as well as structures for the disposal of precipitation and groundwater. The maximum permissible temperature of the liquid that moves along the corrugated PP pipes is + 60 degrees for permanent drains, and for short-term no more than 100 degrees.

Pipelines that are built using corrugated products are installed in open trenches and using the trenchless method. Crossings are equipped with reinforced concrete wells. No additional equipment and special equipment is required for laying large diameter corrugated pipes.

Now industrial enterprises have mastered the production of double-layer corrugated pipes made of polypropylene.

Their positive qualities are:

long service life;
good bandwidth;
resistance to corrosion and aggressive chemical compounds;
increased ring stiffness;
the presence of dielectric properties that provide resistance to the effects of stray currents;
resistance to water-jet wear.

Among the disadvantages is susceptibility to accelerated aging.

Welding technology for polypropylene pipelines

In the process of installing a system of pipes made of polypropylene, the method of thermal polyfusion is used - the parts to be welded are heated and quickly connected using a soldering iron.

Some manufacturers equip the welding tool with two heating elements instead of one. In this case, the power becomes enough to heat pipe sections of different diameters without problems.

But this advantage can also become a disadvantage at the same time. Performing heating with two elements at once can overheat the plastic and overload the power supply network. For this reason, the second heater should only be used as a backup when the first fails.

The duration of the heating phase depends on a number of factors:

diameter of pipe products;
ambient temperature, which should not deviate from the norm;
the size of the welding belt.

After heating, polypropylene retains its ductility for a short period of time. In a matter of seconds, it is required to fix the connection, avoiding distortions. Optimum temperature for warming up is + 260 degrees.

To ensure a reliable and strong connection, polypropylene must be very hot, but excessive heat can lead to loss of shape of the product. Therefore, you should control the time during which welding is performed.

Depending on the cross-section of PP pipes, it should be:

with a diameter of 20 millimeters - 8-9 seconds;
when welding products with a diameter of 25 millimeters - 9-10 seconds;
when connecting parts with a diameter of 32 millimeters - 10-12 seconds.

It is not enough to heat and connect polypropylene pipes, they still need to be properly cooled. The freeze period should be the same as the heating phase. If the execution this process as a result of the rush to complete earlier, the connection will undergo deformation.

The technology of welding PP pipes is not an easy job. Of great importance is not only violation of the heating time, but also failure to comply with the rules for performing soldering.

The main nuances of the process are as follows:

During work, the welding machine must be constantly turned on.
Markings should be applied to the surface of the pipes, which will provide the required depth of the welds.
The parts to be joined must be heated at the same time.

Most developers, having familiarized themselves with the advantages of polypropylene pipe products, opt for these particular products. The finances spent on purchasing PP pipes will certainly pay off over time.