Polypropylene pipes 20 sdr 6. Polypropylene pipes. What does SDR consist of?

You have built your own country house, dacha, or even bought yourself a new wonderful apartment. The time has come to lay utilities, such as heating systems, cold and hot water supply. The modern market allows buyers a huge selection of pipeline fittings, and of course modern plastic pipes. They all look the same, and it is almost impossible for a non-specialist to understand them. But how not to make a mistake and buy a truly reliable polypropylene, polyethylene, plastic pipe. How to guarantee to protect yourself from possible ruptures and leaking pipes. The answer lies in a very important parameter that you must know before purchasing a pipe.

SDR of a pipe is the main digital indicator of pipe reliability, and the lower it is, the more reliable the pipe.

What is SDR? This is the ratio of the diameter of the pipe to the thickness of its walls. The thicker the walls of a plastic pipe, the more reliable it is. Accordingly, if the diameter is divided by a larger number, the result obtained is smaller.

Let's look at several SDR values ​​using polypropylene pipes as an example.

Polypropylene pipe SDR 11, technical characteristics:

Working pressure no more than 10 atm

As a rule, this is a non-reinforced pipe that is used only for cold water supply. This pipe is not suitable for heating systems.

Can be used to supply cold water both in a private home and in urban areas. In both cases, the water pressure in the mains will not exceed 3-5 Atm.

Polypropylene pipe SDR 7.4, technical characteristics:

Working pressure no more than 20 atm

Can be used to supply cold and hot water both in a private home and in urban areas. But if we consider this SDR value for the supply to heating radiators in a city multi-storey building, you can play it safe by taking a pipe with a lower SDR value.

Polypropylene pipe SDR 6, technical characteristics:

Working pressure no more than 25 atm

Typically, this is a pipe reinforced with aluminum foil and fiberglass, which is used for both cold and hot water supply and heating.

Can be used to supply cold and hot water both in a private home and in urban areas. Technical parameters allow polypropylene pipes with this SDR value to be used even in heating systems of multi-storey buildings. This is a polypropylene pipe with a high safety margin.

You can buy polypropylene pipes with different SDR values ​​in our store in Moscow, and with delivery to the regions.

When purchasing from the SantekhnikUM company for the installation of communication systems for home or industrial purposes, you can see markings applied to them with a set of various data about a specific product. It contains:

• information about the pipe manufacturer,
• numbers of GOST standards in accordance with which it was manufactured,
• The abbreviation "PPR" means that the pipes are made of polypropylene - a thermoplastic polymer of the hydrocarbon "polypropylene".
• diameter of the product and thickness of the material of its walls,
• as well as the abbreviation SDR with a certain index.

In this case, the SDR of polypropylene pipes is a strength value by which the capabilities of pipe products can be most accurately determined.

What does SDR consist of?

SDR (from English Standard Dimension Ratio - standard dimensional ratio) is a dimensional characteristic of a polymer pipe, which is the result of the ratio of the outer diameter to the thickness of the polypropylene wall. This value is inversely proportional to the thickness of the pipe walls, that is, products with a higher SDR index have thinner walls, and vice versa - a thick-walled pipe is indicated by a lower SDR.

Pipes of the same diameter with thicker walls can withstand much greater loads, which are caused during operation by the following technical and natural factors:

• internal pressure of the contents,
• external compression, for example when covering a pipe with earth,
• external mechanical influences, such as seasonal soil movements, etc.

That is, the SDR indicator, along with the thickness of the polypropylene layer, indicates the possible load or pressure (internal and external) for a given pipe.

What is the difference between pipes with different SDR indexes?

General differences

At the moment, polypropylene pipes are produced with SDR from 6 to 41, for which the possible loads are presented in the following table by “pressure classes”:

Thus, the standard dimensional coefficient can be used when determining the purpose of the pipe for specific systems - pressure and non-pressure, namely:

• Pipes with index SDR 26-41 are used for free-flow (gravity) sewer outlets;
• With indicators of 21-26 they can already be used for intra-house low-pressure water supply to low-rise buildings;
• Products indexed with an index from 11 to 17 can be used for the construction of low-pressure water supply and irrigation systems;
• Pipes with an SDR greater than or equal to 9 are suitable for pressure systems intended for water supply, construction of pressure sewer collectors and even gas pipelines.

Examples

Polypropylene pipes of the same brand with different SDRs can have significant differences. So, for the most popular brand of polypropylene SDR 11 (PN 10) VALFEX

1. Polypropylene pipe SDR 11 (PN 10) VALFEX– Polypropylene pipe PPR-C SDR 11 (PN 10) complies with GOST 32415-2013, suitable for drinking and domestic cold water supply systems, hot water supply, as well as process pipelines transporting liquids and gases that are non-aggressive to pipe materials. The pipes have good thermal insulation properties, chemical resistance to more than 300 substances and solutions, as well as noise-absorbing properties. Maximum operating temperature: +60 °C. Pipeline installation technology – polyfusion welding;

Polypropylene pipe SDR 6 (PN 20) VALFEX-Pipe made of polypropylene PPR-C SDR 6 (PN 20) complies with GOST 32415-2013, suitable for drinking and domestic cold water supply systems, hot water supply, as well as process pipelines transporting liquids and gases that are non-aggressive to pipe materials. The pipes have good thermal insulation properties, chemical resistance to more than 300 substances and solutions, as well as noise-absorbing properties. Maximum operating temperature: +95 °C, briefly up to +100 °C. Pipeline installation technology – polyfusion welding;

Glass fiber reinforced polypropylene pipe SDR 7.4 (PN 20) VALFEX-Polypropylene pipe PP-R, reinforced with glass fiber, SDR 7.4 (PN 20), complies with GOST 32415-2013 and is used for radiator heating systems, drinking hot and cold water supply systems, air conditioning, industrial pipeline networks. The pipe has an increased service life in heating and cooling systems, because The glass fiber layer ensures the strength of the pipes with a smaller wall thickness, while the conductivity of the carrier is increased by 20%. Pipeline installation technology is polyfusion welding. Maximum operating temperature: +95°C.

Glass fiber reinforced polypropylene pipe SDR 6 (PN 25) VALFEX — Polypropylene pipe PP-R, reinforced with glass fiber, SDR 6 (PN 25), complies with GOST 32415-2013 and is used for radiator heating systems, drinking hot and cold water supply systems, air conditioning, industrial pipeline networks. The pipe has an increased service life in heating and cooling systems, because The glass fiber layer ensures the strength of the pipes with a smaller wall thickness, while the conductivity of the carrier is increased by 20%. Pipeline installation technology is polyfusion welding. Maximum operating temperature: +95°C.

Polypropylene pipe reinforced with aluminum SDR 6 (PN 25) VALFEX — Polypropylene pipe reinforced with aluminum PP-R PN 25 SDR 6 (PN 25) complies with GOST 32415-2013. It is used in cold and hot water supply, low- and high-temperature heating, when laying pneumatic pipelines, process pipelines, and in integrated fire-fighting water supply systems. The inner aluminum layer has absolute oxygen impermeability, reduces the thermal expansion of the pipeline, and also increases the strength of the pipe due to the presence of a continuous longitudinal weld. The special design of the pipes does not require stripping before welding. Nominal pressure (cold water transportation) – 25 bar. The maximum operating temperature is 90 °C. The range of outer diameters of the proposed polypropylene pipes is 20–110 mm.

IMPORTANT! When choosing an SDR pipe, be sure to consider the grade of polypropylene from which it is made. Even for the same dimensional coefficients, a pipe of a higher grade will be stronger and more resistant to mechanical stress. For example, SDR 6 (PN 25) VALFEX, Unlike SDR 6 (PN 20) VALFEX with the same index, can be used for pressure water and gas pipelines.

Polypropylene pipes are a modern alternative to metal pipes. They are used for transporting cold and hot water, for internal and external sewerage, in heating systems, underfloor heating and other areas.

A new type of polypropylene (“random copolymer”, marked “PP-R”) is a plastic, lightweight and durable material that consists of a mixture of polypropylene and ethylene.

The presented material is non-toxic, harmless to humans and the environment. It also does not affect the quality of transported water.

Types of polypropylene pipes

The Ego Engineering company sells plumbing equipment, including the following polypropylene pipes:

SDR 11(PN10) – unreinforced PP-R pipes. The standardized thickness of their walls is 1.9 - 11.4 mm, internal diameter - 16.2 - 102.2 mm, external diameter - 20 - 125 mm. This type is recommended for cold water supply systems (up to 20 °C), the operating pressure in which does not exceed 1 MPa.
SDR 6 (PN20) – universal unreinforced PP-R. Standard internal diameter – 13.2 – 83.2 mm, external – 20 – 125 mm. This polypropylene pipe has a wall thickness of 3.4 - 20.9 mm. Experts advise using it for both cold (up to 20 °C, pressure - 2 MPa) and hot (maximum 75 °C, pressure - 0.8 MPa) water supplies.
SDR 5 (PN25) is a PP-R reinforced with aluminum foil (perforated or solid) located at the outer wall. The presented type of pipes is suitable for heating systems (maximum temperature - 90 °C, pressure - 0.8 MPa), cold (up to 20 °C, pressure - 2.5 MPa), hot (maximum 75 °C, pressure - 0.8 MPa) water supplies.
SDR 6 DUO (PN20) is PP-R with aluminum foil reinforcement (perforated or solid) located in the middle part. The presented type of pipes is suitable for heating systems (maximum temperature - 90 °C, pressure - 0.6 MPa), cold (up to 20 °C, pressure - 2.0 MPa), hot (maximum 75 °C, pressure - 0.8 MPa) water supplies.
SDR 7.4 RUBIS (PN16) is PP-R with fiberglass reinforcement located in the middle part. The presented type of pipes is suitable for cold (up to 20 °C, pressure - 1.6 MPa) and hot (maximum 75 °C, pressure - 0.6 MPa) water supplies.
SDR 6 RUBIS (PN20) is PP-R with fiberglass reinforcement located in the middle part. The presented type of pipes is suitable for heating systems (maximum temperature - 90 °C, pressure - 0.6 MPa), cold (up to 20 °C, pressure - 2.0 MPa), hot (maximum 75 °C, pressure - 0.8 MPa) water supplies.

Advantages of polypropylene pipes

Long service life. Buying these pipes is beneficial from the point of view of its durability. The service life in heating systems is at least 50 years, in cold water supply – more than 100 years.
Noise absorption. At a low cost of pipes, they have a high level of sound absorption. Due to the fact that polypropylene dampens noise well, the transportation of water and coolants is as quiet as possible.
Resistance to changes. Random copolymer is resistant to deposits of hardness salts, aggressive substances (acids and alkalis), corrosion, pressure changes, and temperature. This quality makes the pipes resistant to destruction and does not allow the internal diameter to decrease when used in heating and water supply systems.
Loyal cost. The price of polypropylene pipes is much more pleasant compared to its competitors. At the same time, the low weight makes it possible to further save money on transportation and installation processes.
Speed ​​of installation. Polypropylene pipes and fittings (bends, tees, etc.) allow you to create pipeline systems of varying complexity. At the same time, the features of socket welding ensure their rapid installation by just a few installers.

Single-layer pressure pipe made of random copolymer polypropylene with a maximum design pressure in the system not higher than 2 MPa. Recommended use is cold and hot water supply and low-temperature heating, including the transportation of drinking water. Operating temperature – up to 70°C. Service life up to 50 years. * *see operating requirements in accordance with GOST 32415-2013 Pipe PN20, often used in residential, commercial and industrial buildings, private construction, in hot and cold water supply systems. Pipeline made of polypropylene "Random copolymer" complies with GOST 32415-2013. The special production technology plus the properties of the manufacturing material contribute to the creation of a reliable pipeline system with an extended service life of up to 50 years, withstanding a nominal pressure of 2 MPa. Basic properties The defining technical characteristics of the polypropylene pipe PP-R PN20 look like this: operating temperature range - 70 ° C (determines the use for a heating system);