Characteristics of polypropylene (PPR) pipes. Where is PPR (polypropylene) pipe used? Polypropylene pipe ppr pn 20

Polypropylene products belong to the group of environmentally friendly materials. They are more attractive than steel products with lower cost and weight, and are superior to metal-plastic options in terms of strength and durability. A wider area of application for parts marked PN 20, so they are more in demand compared to other options on the market. Let us consider in more detail the technical characteristics of the PN 20 pipe, the properties of the material, its pros and cons.

Material Features

The material from which the PPR PN 20 pipe is made is a random polypropylene copolymer (third type). It was invented relatively recently, which made it possible to use products in high-temperature conditions. The main features of the material include:

High resistance to direct attack by acidic and alkaline solvents.
High plasticity, due to which the products easily tolerate freezing and reverse thawing of moisture inside them.
The temperature range for the use of parts made from this material has been extended - from 10 to 90˚С.
The material is absolutely non-toxic, therefore it is successfully used for assembling drinking water supply systems.
During the processing and disposal of parts, environmentally harmful substances are not emitted.

All these distinctive features were obtained by adding ethylene molecules to the molecular chain of polypropylene. By modifying its structure, ductility, toughness and thermal strength have been improved.

For self-assembly of the system, you will need to purchase a special welding machine. The connection of the segments with the help of it is the most hermetic and reliable

Varieties

The pipe in question, marked PN 20, is produced by manufacturers only in a single form and does not have any variations. But you can often hear about the purchase or use of a reinforced pipe PN 20. In fact, this type of product is produced under a different marking - PN 25. It received the status of a reinforced analogue by mistake, since the external parameters of the products are the same.

The wall thickness of the pipes under these markings will match on all existing diameters, but their weight will vary. Parts with an aluminum reinforcing layer are the heaviest, those with a fiberglass layer are of medium weight, and the lightest are those in which there is no reinforcement at all.

Pipes also differ in the maximum allowable indicators of the temperature of the working medium and working pressure. So for PN 20 models, the allowable temperature is not higher than 80˚С. For parts reinforced with fiberglass, this figure is higher - 95˚С. For aluminum-reinforced parts, short-term exposure to a coolant with a temperature of 100 ° C is allowed. The maximum working pressure for non-reinforced models is 20 atmospheres, and for reinforced ones - 25 atmospheres.

Scope of application

PP PN 20 pipe is used for various purposes.

As a distribution water supply mechanism in residential, industrial, administrative buildings and agro-industrial complexes.
For laying water supply (hot and cold) indoors and outdoors.
For the installation of "warm floor" systems, which are laid in niches under the floor covering, or recessed in a concrete screed.
As connecting segments for connecting radiators to the heating system.
For the distribution of the heating system in rooms, in which the maximum temperature does not exceed the permissible value for the material used.
For connecting heating systems to boiler plants.
As systems transporting compressed air or aggressive chemicals.

It is forbidden to bend products. All turns are performed strictly at right angles using adapters and couplings.

Specifications

The marking is deciphered as follows: PPR - random polypropylene (improved third type), PN - nominal pressure. Technical characteristics of the PPR PN 20 pipe:

Linear expansion coefficient (1/˚С) – 12.7*10-5.
Thermal conductivity coefficient (W * m / ˚С) - 0.238.
The maximum allowable temperature is 80˚С (to increase the service life of products, it is recommended not to exceed 70˚С).
The maximum allowable pressure is 2 MPa (1 MPa = 10 atmospheres).
The wall thickness with a product diameter of 20 mm is 3.4 mm.
The mass of one meter of a product with a diameter of 20 mm is 170-175 g.

Product Benefits

Many of its positive qualities incline to the choice of a PN 20 pipe. We list the main advantages:

Lower cost and weight compared to traditional metal products.
Simple and fast system installation process. Socket welding securely and hermetically connects the segments (it takes 10-15 seconds to heat the parts).
The elasticity of the material allows the use of products for the assembly of "warm floor" systems and laying plumbing in unheated areas.
The material from which the parts are made is non-toxic and resistant to chemical attack.
The inner walls are not susceptible to corrosion, and the smooth surface prevents the formation of plaque.
Resistant to temperature changes and pressure surges.
The low thermal conductivity of the material eliminates the risk of condensation on the surface of the system.
A high level of sound insulation reduces the noise of the system.
Resistant to aggressive environments, which reduces the cost of additional protective measures (painting, priming and other procedures).

The service life of parts in a heating or hot water supply system is 25 years. The service life of parts in the cold water system is twice as long

Technologically correct installation of the system, high-quality connection of its segments to each other and compliance with the operating rules will significantly increase the service life of the water distribution mechanism.

Pipe PPR PN25 is a polypropylene pipe reinforced with aluminum film or fiberglass, with a nominal pressure of PN25. According to the available properties, it is identical to metal-plastic. It is used in hot water and heating systems. We will consider the properties and characteristics of this pipe in this article.

What is a pipe PPR PN25

As mentioned above, the PPR PN25 pipe is one that is reinforced with an aluminum film or fiberglass and is similar in properties to metal-plastic. The period of operation of such a pipe depends on the operating pressure in the system and the temperature of the coolants. Nominal pressure - 2.5 MPa. Pipe dimensions: outer diameter 21.2–77.9 mm, inner diameter 13.2–50 mm, wall thickness 4–13.4 mm.

Manufacturers confidently declare that polypropylene has amazing properties. This material is universal and is used in the installation and reconstruction of utilities in residential and industrial complexes. The PPR pipe with a nominal pressure of PN25 has successfully passed tests in independent European and world laboratories, which is proved by confirming quality certificates. Its essential advantages:

Long service life - about 50 years, and in cold water systems such pipes can serve up to 100 years.

Special inner surface that does not form any deposits when exposed to water.

Excellent soundproofing. Polypropylene absorbs noise generated during water transport.

Low thermal conductivity of the PPR polypropylene pipe (resistant to temperature changes), due to which condensation does not form on it.

Light weight compared to metal counterparts (9 times lighter).

Ease of installation.

Resistance to acid-base substances.

High elasticity.

Acceptable price.

Polypropylene pipe PN25 according to GOST

Modern polypropylene pipes are highly reliable, durable and have an affordable price. A polypropylene pipe with a nominal pressure of PN25 is not subject to corrosion, is resistant to temperature changes, is easy to install and is made of environmentally friendly materials. The main properties in accordance with GOST are given in the table.

GOST	Parameter	Indicator
	Thermal conductivity, at +20 ° С
	Density
	Heat capacity at +20 ° С (specific)
	Melting
	Tensile strength (at break)	34 ÷ 35 N/mm2
	Yield strength elongation
	Yield strength (tensile)	24 ÷ 25 N/mm2
	Expansion factor

Polypropylene pipe with nominal pressure PN25: technical specifications

A few years ago, the PPR PN25 pipe was developed and put into mass production. Its technical characteristics can be found in the product data sheet.

	Characteristic name	Values for polypropylene pipes: dimensions
	Characteristic name
	Internal Ø
	Specific heat capacity	1.75 kJ/(kg K)
	Ø tolerance
	Linear expansion, (1/ 0 С)
	Heating time during welding
	Roughness coefficient (equivalent)
	Cooldown time, (seconds)
	Tensile strength
	Regulatory Series
	Elongation at break (relative)
	Weight (kg/linear meter)
	Tensile yield strength
	Melt flow rate (index) PPR	0.25 g/10 min
	Thermal conductivity	0.15 W m/ 0 C
	Heating time during welding
	Elastic modulus PPR
	Pipe socket depth (minimum) when welding
	Pipe density (equivalent)
	Volume (internal) running meter/l
	Elastic modulus PPR + fiber
	Dimensional ratio (standard)
	PPR Density
	Pressure (nominal), PN
	Time of welding

A polypropylene pipe with a nominal pressure of PN25 is a high quality product, despite the fact that it appeared on the market not so long ago. The use of this technology made it possible to eliminate the problem with a high coefficient of thermal expansion of plastic pipe products.

The above characteristics allow it to be used in drinking and hot water supply systems, during the installation of heating and other utilities. For non-aggressive liquids and gases that do not affect the pipe material, it is also excellent.

What are the advantages and disadvantages of PPR PN25 pipes

Polypropylene pipe is one of the most popular types of building materials due to its technical characteristics and the amazing properties of this polymer.

Experts talk about the following features of this material:

The period of operation is up to 50 years. And if used only in cold water supply, then this period can reach 100 years.

No hard deposits are formed. This was made possible thanks to a special technology for processing the inner surface.

Noise protection. This feature is also inherent in polypropylene pressure pipes, in which, due to high pressure, vibrating and rumbling noises unpleasant for the human ear may appear.

No condensation. The reason is the low thermal conductivity of polypropylene pipes.

Light weight. It is 9 times less than that of metal pipes.

Easy installation. But do not neglect the advice of professionals if you are new to this business. Particular attention should be paid to the heating time of polypropylene pipes when they are connected by welding.

No need for additional maintenance.

Resistant to chemically aggressive acid-base compounds.

Has increased flexibility.

Affordable. There is a wide price range on the market.

It must also be said that a polypropylene pipe with a nominal pressure of PN25 has good frost resistance, because this parameter is important for the special climate of our country.

Before that, we talked about the advantages of polypropylene pipes. But they also have disadvantages:

Characterized by a fairly high linear expansion. Unreinforced polypropylene pipes require the use of special expansion joints during installation.

Low thermal stability. Regardless of the type of selected polypropylene pipes, a heater must be used. This is especially important for heating systems.

Almost incapable of deformation. To change the direction of the pipe, additional fittings are needed.

Avoid exposure to direct sunlight. And although direct solar exposure does not contribute to an increase in temperature, it leads to premature aging of the material.

Advice! When installing the pipeline, the expansion coefficient must be taken into account and special rules must be followed. So, pipes should not be allowed to sag. To do this, the pipe attachment points on the wall must be located at a certain small distance from each other.

What to be guided by when choosing a pipe PPR PN25

Maximum temperature. Pipes are selected depending on the temperature of the coolant, taking into account the marking of polypropylene pipes. As mentioned above, a PPR pipe with a nominal pressure of PN25 is an excellent option for heating systems, with PN20 - used in hot water supply, with PN16 - in cold water supply systems.

Diameter. They are selected taking into account the technical characteristics of the planned pipeline system. For wiring in an apartment, pipes with a diameter of 20 mm and 25 mm are best suited. For risers, products with a diameter of 32 mm or 40 mm are used. Polypropylene pipe with thick walls and large diameter is used for the main pipeline installed in the basement of a high-rise building.

Maximum allowable pressure. For domestic conditions, almost all types of pipes are used, including products of the PN10 brand. The effect of temperature on the service life of the PPR can be considered using this pipe as an example.

At a water temperature of +20 ˚С: service life - up to 50 years, provided that the pressure in the central line does not exceed the prescribed one.

At a water temperature of +50 ˚С: in order for the pipeline to serve for 50 years, the pressure must not be higher than the proper one.

At a water temperature of +70 ˚С: the service life will be equal to that declared by the manufacturer at pressure.

If the water temperature is often +95 ˚С: in such cases, the pipe is unlikely to last 50 years. The maximum service life under these circumstances is 5 years at constant pressure.

Thermal expansion coefficient. It is known that polypropylene pipes change their geometry under the influence of high temperature of the transported liquid. The thickness of their walls changes. And this affects the throughput of the pipeline.

Closed laying of pipe with nominal pressure PN20 is undesirable. When deformed, cracks may appear on the plaster. For pipes with a nominal pressure of PN25, both closed and open laying is acceptable. With open laying, the interior of the living space will not become worse, because there are no bends on these products. The pipe is polypropylene, reinforced with fiberglass, with a nominal pressure of PN25 perfectly retains its shape.

Important! The coefficient of linear expansion of polypropylene pipes largely determines how to lay the pipeline for hot water supply.

The service life of polypropylene pipes with proper operation is at least half a century.

How to connect pipes PPR PN25

Welding of pipes is carried out by the method of thermal polyfusion. The parts to be welded must be heated and joined quickly. A special soldering iron is used for heating. Some models have two heating elements at once, the power of which is designed to heat pipes of a specific diameter, but this does not always have a positive effect on the quality of welding.

Important! The use of two elements at once can lead to overheating of the plastic and overloading the electrical network. Therefore, the second heater should be used when the first becomes unusable.

The heating time depends on:

pipe diameter;

welding belt width;

ambient temperature - it should be within normal limits.

The material after heating retains plasticity for a short time. Fixing the connection should be done within a few seconds, while avoiding distortions. The optimum temperature for warming up is +260 ˚С. For a reliable connection, the pipe material must be heated strongly. But excessive heat can cause shape change. To avoid this, it is necessary to control the execution time of this operation. It must not exceed:

8 ... 9 seconds for pipes with a cross section of 20 millimeters;

9 ... 10 seconds when welding a pipe with a diameter of 25 millimeters;

10 ... 12 seconds for pipes with a diameter of 32 mm, etc.

Heated and already connected pipes must cool down. Fixing takes the same amount of time as heating. If you do not withstand the required time, deformation of the connection will occur. Welding polypropylene pipes is a relatively difficult process. The quality is affected not only by the heating time, but also by the violation of soldering rules. They are the following:

during operation, the welding machine must be constantly heated;

marks must be applied to the pipes in order to ensure the proper depth of the weld;

the elements to be joined must be heated at the same time.

SantekhStandart specialists are always ready to help you make the right choice. Our company has been a supplier of engineering plumbing in Russia since 2004.

Cooperating with our company "SantekhStandart", you get the following advantages:

quality products at reasonable prices;

constant availability of products in stock in any quantities;

conveniently located warehouse complexes in St. Petersburg, Moscow, Novosibirsk and Samara;

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delivery of goods to the regions through any transport companies;

individual approach and flexible work with each client;

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certified and insured products;

trademarks registered in Russia, which is an additional protection against low-quality fakes.

The specialists of our company "SantekhStandart" are ready to help both individuals and companies choose plumbing equipment. All you need to do is call:

Polypropylene pipes are gradually replacing metal pipes from such types of construction as laying cold and hot water pipes, as well as heating pipelines (up to certain temperatures). The most commonly used for these purposes are polypropylene pipes of grades PN10 and PN20. The difference between them is that pipes PN10 are nominally designed for operation at a pressure not exceeding 10 atm., PN20 pipes - at 20 atm. Moreover, the former go mainly to the laying of pipelines for cold water supply (CWS), the latter - for hot water (DHW). The raw material for polypropylene pipes PPR PN 20 is a random copolymer of this material, which has good performance characteristics. Therefore, the pipes obtained from it have high impact strength, low thermal conductivity (this is essential for heating and hot water networks), and a long service life. The letters PPR in the pipe brand mean Poly Propylene Random - random polypropylene. When creating a pipeline polypropylene pipes PN20 are connected to each other through fittings by welding (sometimes this process is not quite right called soldering, because soldering is the connection of two homogeneous or dissimilar materials with the help of a third during melting and subsequent curing of the latter). For welding, a simple device is used, which softens the connected polypropylene parts of the pipeline under the influence of the temperature created by it. Now polypropylene PPR pipes PN20 are increasingly used in many types of construction. This is due to the fact that such pipes are insensitive to emergency freezing of liquid in them. Because at the same time, the pipes do not crack like metal pipes, and when defrosted, they continue to perform their functions again. When using metal pipes, in order to avoid freezing them in the cold season, as a result of some circumstances, it is often necessary to use various antifreezes as a coolant. In our warehouse you can purchase cheap PN20 pipes with a diameter of 20-110 mm and a length of 4 m.

With the development of technology, new materials appear on the market that are superior in their characteristics to their predecessors. In the field of communications, old metal pipes are being replaced by modern ones made on the basis of polymers.

One of the most popular materials in heating systems and water supply is polypropylene (PPR in Russian abbreviation or PPR in international marking). Polypropylene pipes have a number of advantages, due to which, when laying sewerage and heating, builders are increasingly inclined towards them.

Polypropylene pipes are used in the installation of communication systems for residential buildings, public buildings, as well as technical and industrial buildings:

for supplying drinking water,
in cold water supply
for hot water supply,
in central space heating,
for installation of warm floors and walls,
in agricultural irrigation,
at industrial enterprises,
in fire safety systems,
in swimming pools and other sports facilities,
in shipping and so on.

Depending on the diameter of the pipe and the presence of additional layers, polypropylene products are used for laying both domestic pipelines and highways.

Varieties of PPR pipes

There are several types of polypropylene pipes:

PN 10 is a thin-walled product that can be used for cold water supply or installation of underfloor heating. The water temperature should not exceed +45°C. Such a pipe can withstand pressure up to 1 MPa (10.2 kg / cm²). This option is very convenient if only cold water is supplied through the pipeline, since a thin-walled product requires the least resources for production, and therefore is cheaper than other types of PPR pipes. Pipes PN 10 are produced with a diameter of 20 mm to 110 mm, with a wall thickness of 2.3-10 mm. The standard pipe length is 4 m.
PN 16 has thicker walls and can be used for both cold and hot water supply (but the temperature must be below +60°C). Working pressure in pipes PN 16 - up to 1.6 MPa (16.32 kg / cm²). On average, the wall thickness of such a product is 0.5 mm greater than that of PN 10, which makes it possible to transport liquids of a higher temperature.
PN 20 is used for hot water supply (up to +80°С) and withstands pressure up to 2 MPa (20.4 kg/cm²). This product has much thicker walls, up to + 1 mm compared to PN 10.
PN 25 are polypropylene pipes that can withstand temperatures up to + 95 ° C, and therefore are used in hot water supply and heating systems. Working pressure - up to 2.5 MPa (25.49 kg / cm²).

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