Pressure pn16 how many MPa. What is nominal bore DN and nominal pressure PN. The classification of industrial pipeline fittings is carried out taking into account several technical, functional and operational characteristics
The main characteristic of the pipeline is the diameter and wall thickness of the pipes from which it is made. Each pipe has two diameters: inner D in and outer D n. Between the inner and outer diameters of the pipes there is the following relationship:
,
where S is the pipe wall thickness.
When the wall thickness of the pipe changes, the inner diameter of the pipe changes, while outside diameter pipe remains constant, since its change inevitably causes a change in the size of the attached fittings and fittings.
In order to preserve for all elements of the pipeline (pipes, fittings and fittings) the value of the flow area, which provides the design conditions for the passage of liquid, steam or gas, the concept conditional pass. The nominal diameter of pipes, fittings and fittings is understood as the average inner diameter of pipes (in the light), which corresponds to one or more outer diameters of pipes. The nominal bore is denoted by the letters DN with the addition of the nominal bore in millimeters: for example, a nominal bore with a diameter of 150 mm is indicated DN 150. The true inner diameter of pipes is usually not equal to and does not correspond (with rare exceptions) to the nominal diameter. So, for example, for pipes with an outer diameter of 159 mm and a wall thickness of 8 mm, the true inner diameter is 143 mm, and for a wall thickness of 5 mm - 149 mm, however, in both cases, the conditional bore is assumed to be 150 mm.
Nominal diameters of fittings, fittings, as well as all parts technological equipment devices to which pipes or fittings are attached are established by GOST 28338-89 “Pipeline connections and fittings. Conditional passages (nominal dimensions). Rows. These quantities have the following range of meanings:
* Can only be used for hydraulic and pneumatic devices
** For fittings general purpose not allowed to apply
The wall thickness of pipes and pipeline parts is selected depending on the highest pressure of the medium (gas or liquid) transported through the pipeline, on its temperature and mechanical properties pipe metal.
As is known, the mechanical strength of the metal of pipes, fittings and fittings changes with increasing temperature. To link the pressure and temperature of the medium flowing through the pipeline, the concept of " conditional pressure", which is denoted by the letters P y.
According to GOST 356-80 “Conditional test and working pressures. Rows. Conditional pressure (P y) should be understood as the highest overpressure at a medium temperature of 293 K (20 ° C), at which the permissible long work fittings and parts of the pipeline, having specified dimensions, justified by the calculation of strength for the selected materials and their strength characteristics, corresponding to a temperature of 293 K (20 ° C).
Test pressure (P pr) should be understood as excess pressure at which hydraulic testing of fittings and pipeline parts for strength and density with water at a temperature of at least 278 K (5 ° C) and not more than 343 K (70 ° C) should be carried out, if the regulatory and technical documentation does not indicate the specific value of this temperature. Limit deviation test pressure value should not exceed ±5%.
The working pressure (P p) should be understood as the highest overpressure at which the specified mode of operation of valves and pipeline parts is ensured.
The values of conditional pressures of fittings and pipeline parts must correspond to the following series: 0.10 (1.0); 0.16 (1.6); 0.25 (2.5); 0.40 (4.0); 0.63 (6.3); 1.00 (10); 1.60 (16); 2.50 (25); 4.00 (40); 6.30 (63); 10.00 (100); 12.50(125); 16.00 (160); 20.00 (200); 25.00 (250); 32.00 (320); 40.00 (400); 50.00 (500); 63.00 (630); 80.00 (800); 100.00 (1000); 160.00 (1600); 250.00 (2500) MPa (kgf / cm 2).
For fittings and pipeline parts, the production of which was mastered before the entry into force of GOST 356-80, conditional pressures of 0.6 (6) are allowed; 6.4 (64) and 8.0 (80) MPa (kgf / cm 2).
Production hydraulic tests test pressure is necessary to check the reliability of the pipeline under operating conditions, therefore, the test pressure is always 1.25-1.5 times greater than the working and conditional pressure, if normative documents does not install yet big values test pressure.
Polypropylene pipes are produced with various technical characteristics, which are displayed in a special marking.
To avoid mistakes when choosing necessary pipes for hot or cold water supply, as well as for heating, you need to have an idea of the marking that is applied to the pipe and is, as it were, its passport.
Rated pressure
- The letters PN stand for nominal pressure. It is expressed in bars (kg/cm2). PN- this is a constant nominal internal pressure of water with a temperature of 20 degrees Celsius, maintained by pipes without fail for 50 years.
- Most common polypropylene pipes PN 25, PN 20, PN 16 and PN 10. Here you need to take into account the fact that the thicker the wall of the pipe, the higher the PN designation will be. The marking of polypropylene pipes for heating is designated PN 20 and PN 25. They are also suitable for arranging hot water supply.
- Some manufacturers make pipes that have a blue longitudinal stripe for cold water(PN 10). The red stripe on the pipes indicates that they are intended for hot water (PN 20). There are tables according to which the service life of the pipe is calculated, guided by data on water temperature and its pressure. The higher the pressure and if the water temperature is above 20 degrees, the less the pipe will last.
Material designation
- Different pipe manufacturers use different designations. But the letters RR always indicate that the pipes are made of polypropylene. If you saw the designations PPH, PP-type 1 or PP-1, then this product is made from the first type of polypropylene - a homopolymer. Designations PP-type 2, PP-2, or PPB - pipes are made of a block copolymer. However, the copolymer is recognized as the best random copolymer: PP-3, PPR, PP-random, PPRC.
- The marking of polypropylene pipes for cold water supply will be indicated PPH. Such pipes are also used for laying ventilation. Pipes marked RRW, find their application in the central and autonomous heating and cold water supply.
- Pipe products with marking PPR most common due to its increased heat resistance. Therefore, they are also suitable for hot water, and for cold, as well as for heating systems varied kind.
What else is labeled
- Pipe diameter and minimum size its walls. The specially adopted scheme for this designation is similar to our metric system of measures. Pipe diameters are indicated in millimeters by numbers - from 10 to 1200 mm.
- Release date, lot number, etc.. Information in 15 digits is indicated by the last two digits of the year when the pipes were manufactured, the month and decade of the year, shift number, batch number, machine and production line.
- Product manufacturer's trademark, certificate information. There is also information on the assignment of a quality mark to a pipe manufacturer, which confirms the ability to produce products according to the national standard, the designation of the material used in production.
Video: Purpose of polypropylene pipes
Polypropylene (PP - according to Russian, PP - according to international classification) pipes are stiffer metal-plastic pipes, they are assembled by diffusion welding using fittings: angles, tees, etc. Polypropylene pipelines use permanent connections, the pipeline is assembled on welded fittings once and for all. Unlike a metal-plastic pipe, which, in fact, is thin aluminum pipe coated inside and outside with a protective layer of plastic, the polypropylene pipe is completely plastic. The plastic used to make pipes also differs. Unlike polypropylene pipes, most metal-plastic pipes use polyethylene.
Thanks to special properties materials piping system made of polypropylene can be used in: water supply of houses; connection of boilers; water distribution; plumbing risers; distribution by floors (normal or at each sampling point with individual connection); connecting the pipeline to existing water supply networks, assembled from metal pipes; heating networks; connection to the boiler plant; switchgears; heating risers; connection of metal radiators.
The long service life of the serial pipe made of polypropylene allows it to be used for all known species pipe laying: open laying, wall laying, concealed laying. For internal systems hot water supply and heating, the most heat-resistant type of polypropylene is used - a random copolymer (marked as PP type 3 or PP Typ 3). Pipelines made of this material, depending on the operating pressure, can serve for a long time with a liquid temperature of up to 95°C. The estimated duration of the use of the pipeline is more than 50 years, and in pipelines of cold water supply even more - from 50 to 100 years. Temperatures of the order of 100°C due to short-term failures do not adversely affect the service life of the pipeline.
All parts of the pipeline that are in contact with drinking water, comply with the current standards of Russia. Suitability of polypropylene for work in contact with liquid food products are confirmed by national certificates of Belgium, Germany, Great Britain, Italy, Spain, USA.
Pipes (fig. 20) are divided into three categories:
- PN 10 - thin-walled version, for cold water supply (up to +20°С) and underfloor heating (up to +45°С), nominal operating pressure 1 MPa (10.2 kg/cm²);
- PN 20 - universal pipe, used for hot water supply (temperature up to + 80 ° C), nominal pressure 2 MPa (20.4 kg / cm²);
- PN 25 - reinforced aluminum foil, for hot water supply and central heating(up to +95°C), nominal pressure 2.5 MPa (25.49 kg/cm²).
Polypropylene pipe PN 16 - for cold and hot water supply (up to + 60 ° C), nominal working pressure 1.6 MPa (16.32 kg / cm²), could be the fourth in the list of categories of these pipes, but it is rare.
Rice. 20. Polypropylene pipes
 |
PN 10 Size, mm | D, mm | S, mm | d, mm |
|---|---|---|---|---|
| 20x1.9 | 20 | 1,9 | 16,2 | |
| 25×2.3 | 25 | 2,3 | 20,4 | |
| 32×3.0 | 32 | 3 | 26,0 | |
| 40×3.7 | 40 | 3,7 | 32,6 | |
| 50×4.6 | 50 | 4,6 | 40,8 | |
| 63×5.8 | 63 | 5,8 | 51,4 | |
| 75×6.9 | 75 | 6,9 | 61,2 | |
| 90×8.2 | 90 | 8,2 | 73,6 | |
| 110×10 | 110 | 10 | 90,0 | |
| PN 20 Size, mm | D, mm | S, mm | d, mm | |
| 16×2.7 | 16 | 16 | 10,6 | |
| 20×3.4 | 20 | 3,4 | 13,2 | |
| 25×4.2 | 25 | 4,2 | 16,6 | |
| 32×5.4 | 32 | 5,4 | 21,2 | |
| 40×6.7 | 40 | 6,7 | 26,6 | |
| 50×8.4 | 50 | 8,4 | 33,2 | |
| 63×10.5 | 63 | 10,5 | 42,0 | |
| 75×12.5 | 75 | 12,5 | 50,0 | |
| 90×15.0 | 90 | 15 | 60,0 | |
| 110x18.4 | 110 | 18,4 | 73,2 |
| D, mm | D1, mm | D2, mm | S, mm | |
|---|---|---|---|---|
| 20 | 13,2 | 21,2 | 4,0 | |
| 25 | 16,6 | 26,2 | 4,8 | |
| 32 | 21,2 | 33,2 | 6,0 | |
| 40 | 26,6 | 41,4 | 7,4 | |
| 50 | 33,2 | 52,5 | 9,1 | |
| 63 | 42,0 | 65,9 | 11,3 | |
| 75 | 50,0 | 77,9 | 13,3 |
Unlike metal-plastic pipes, the aluminum layer in PN 25 pipes is closer to the outside and, most often, perforation is made on it, which makes it possible not to use glue to fasten the pipe layers. The connection of the outer and inner layers of polypropylene with each other or with an aluminum layer occurs through perforated holes, which, in turn, can be through or surface for various manufacturers. The direct connection of polypropylene with aluminum significantly increases the stability and strength of the pipes. Pipes PN 25 are designed for special use- mainly in heating pipelines, as well as in pipelines for hot water supply, but can also be used for cold water supply systems. For example, among domestic plumbers, this is one of the most “favorite” pipes, it is installed on all types of wiring.
Polypropylene pipes are gray, white, black and green. A color other than black does not mean any restrictions on the use of pipes. The black color of the pipe shows that it is the most protected from ultraviolet radiation.
It should also be noted that the service life of polypropylene pipes declared by the manufacturer is 50 years, which implies that the pipeline will be operated at normal pressure and normal temperature. That is, pipes can withstand significant long-term pressures, but the temperature of the transported liquid must be low, or, conversely, the temperature of the liquid can be very high, but the pressure must be low. At high pressure and high temperatures, the service life of the pipe is sharply reduced and can reach up to 1–5 years. To determine the service life of pipes operating in extreme conditions, there is a special table. We will not give it, since at the domestic level such long-term loads do not occur in domestic pipelines, and short-term emergencies associated with a sharp jump in pressure or a sharp jump in the temperature of the transported liquid, the pipe will withstand.
For polypropylene pipelines, all types of fittings necessary for the device are produced engineering communications, which allows you to refuse to include in the pipe system metal parts and perform optimal piping installation. And also allow you to connect a polypropylene pipeline to a metal one. Pipes are environmentally friendly and are successfully used in pipelines of cold and hot water supply and heating. Thanks to fittings with chrome and brass inserts pipes can be easily combined with existing steel reinforcement and plumbing fixtures.
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What is DN, Du and PN? Plumbers and engineers need to know these parameters!
DN - The standard designating the conditional internal diameter.
PN - Standard designating nominal pressure.
What is Du?
Doo- formed from two words: Diameter and Conditional. DN = DN. Do is the same as DN. It's just that DN is more of an international standard. Du - Russian-language representation of DN. Now it is categorically necessary to abandon such a name Du.
What is DN?
DN- Standardized diameter representation. GOST 28338-89 and GOST R 52720
Nominal diameter DN(Nominal diameter; Nominal bore; Nominal size; Nominal diameter; Nominal bore): Parameter used for pipeline systems as a characteristic of the connected parts of the valve.
Note - The nominal diameter is approximately equal to the internal diameter of the pipeline to be connected, expressed in millimeters and corresponding to the nearest value from a series of numbers taken in the prescribed manner.
What is DN usually measured in?
Under the terms of the standard, it seems that it does not have a strict binding to a unit of measure (it is written in the documents). But it refers to the size of the diameter. And diameter is measured by length. And because the unit of length can be different. For example, inch, foot, meter, etc. For Russian documents, we simply measure in mm by default. Although the documents say that it is still measured in mm. GOST 28338-89. But it does not have a unit of measurement:
How does it not have, if it has? Can you write in the comments how to understand this phrase?
It seems to have reached ... DN (serial number of diameter expressed in millimeters). That is, it does not have a unit of measurement, but rather contains constant values (digital discrete values of the type: 15,20,25,32...). But it cannot be designated, for example, as DN 24. Because the number 24 is not in GOST 28338-89. There are strict values in order like: 15,20,25,32 ... And only they need to be chosen for designation.
DN is measured by the nominal diameter in mm (millimeter = 0.001 m). And if you see DN15 in Russian documents, then this will indicate an inner diameter of about 15 mm.
Conditional pass- says that this is the inner diameter of the pipe, expressed in millimeters - conditionally. The term "Conventional" means that the diameter value is not accurate. Conventionally, we accept that it is approximately equal to some values of the standard.
Under the conditional passage (nominal size) is understood the parameter used for pipeline systems as a characteristic of the connected parts, for example, pipeline connections, fittings and fittings. The nominal diameter (nominal size) is approximately equal to the inner diameter of the connected pipeline, expressed in millimeters.
According to the standard from: GOST 28338-89 it is customary to choose those numbers that have been agreed upon. And you should not invent your own numbers with commas. For example, DN 14.9 would be a designation error.
Nominal diameter approximately equal to the internal diameter of the connected pipeline, expressed in millimeters and corresponding to the nearest value from a series of numbers taken in the prescribed manner.
Here are the numbers:
For example, if the real inner diameter is 13 mm, then we write as: DN 12. If the inner diameter is 14 mm. then we take the value DN 15. That is, we select the number closest in value from the list of the standard: GOST 28338-89.
If both the diameter and wall thickness of the pipe should be indicated in the projects, then it should be indicated as follows: f20x2.2 where the outer diameter is 20 mm. And the inner diameter is equal to the difference in wall thickness. In this case, the inner diameter is 15.6 mm. GOST 21.206–2012
Alas, we have to obey someone else's standards
Any imported materials from abroad were most often developed using a different length dimension: Inch
Therefore, most often the sizes are focused on the inch. Usually, a quotation mark is written for the place of the word inch.
1 inch = 25.4 mm. Which is the same 1” = 25.4mm.
Dimension table. Usually, a quotation mark is written for the place of the word inch.
1/2" = 25.4 / 2 = 12.7. But in reality, this 1/2" dimension is equal to a 15 mm passage. More precisely, maybe 14.9mm. for steel pipe. In general, the dimensions may differ by a few mm. Therefore, in such cases, for accurate calculations, you need to find out the inner diameter of a particular model separately.
For example, size 3/4” = 25.4 x 3/4 = 19 mm. But we write in the documents “conditionally” DN20 - approximately the inner diameter is 20mm.
Here are the actual sizes that most often correspond in the Russian translation.
The table shows the inside diameter in mm.
Nominal pressure PN: More details in GOST 26349 and GOST R 52720.
Has a unit of measurement: kgf/cm2. The designation kgf means kg x s (kilogram times s). c=1. c characterizes, as it were, the coefficient of force. That is, by multiplying a kilogram (mass) by a force, we convert mass into force. This is such an amendment for meticulous physicists. If you designate kg / cm2, in principle, you will also not be mistaken if you believe that we perceive mass as a force. Also, such a unit as kg / cm2 is erroneous in that pressure is formed from two units (force and area). Mass is another parameter. Because the mass only on the surface of the earth creates the force that presses on the earth (gravitational force). The value of c=1 on the surface of the earth. And if you fly away to another planet, then the gravitational force will be different, and the mass will create a different force. And on another planet, the coefficient c=1 will be equal to another value. For example, c=0.5 will create half the pressure.
What is PN for?
The PN value is needed in order to indicate to the device the pressure limit that must not be exceeded for the normal operation of the device for which this value is set. That is, when designing, the designer must know in advance what maximum pressure the device is designed for.
For example, if the device was given a value of PN15, this means that the device is designed for operation with a pressure not exceeding 15 kgf / cm2. Which is approximately equal to 15 bar.
1 kgf/cm2 = 0.98 bar. Roughly speaking, the value of PN is approximately equal to the Bar or the atmosphere.
For example, if the device was given a value of PN10, then it is designed for a pressure not exceeding 10 bar.
Definition of PN according to the standard
The highest excess working pressure at a working medium temperature of 293 K (20 °C), at which a given service life (resource) of valve body parts having certain dimensions, justified by strength calculation with selected materials and their strength characteristics at a temperature of 293 K (20 °C).
Russian norms: GOST 26349-84, GOST 356-80, GOST R 54432-2011
European Norms: DIN EN 1092-1-2008
American norms: ANSI/ASME B16.5-2009, ANSI/ASME B16.47-2006
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A series of video tutorials on a private house
Part 1. Where to drill a well?
Part 2. Arrangement of a well for water
Part 3. Laying a pipeline from a well to a house
Part 4. Automatic water supply
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Hydraulic calculation of a two-pipe associated heating system Tichelman's loop
Hydraulic calculation of a single-pipe heating system
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Manual hydraulic heating calculation
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Constructor of water supply and heating
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What is DN, Du and PN? Plumbers and engineers need to know these parameters!
Hydraulic meanings, concepts and calculation of heating circuits
The leakage coefficient in a one-pipe heating system
Video
Heating
Automatic temperature control
Simple make-up of the heating system
Heat engineering. Walling.
Rated pressure- nominal value technical parameter various equipment, pumps, heat exchangers, pressure vessels, pipelines, fittings, etc. Any product has specific dimensions, justified strength calculations. The calculations take into account the materials selected for manufacturing with the characteristics of their strength at 20 °C of the working environment, which ensures the specified service life of the equipment at a certain working pressure of the environment. This pressure is called nominal (conditional) pressure.
For many technical devices this parameter is the most important due to the fact that it determines the strength characteristics of the equipment, the possibility of its interface with the connecting parts of various pipelines, the possibility of standardizing the requirements for testing conditions for strength and density of materials and joints.
Standards and regulations
The definitions of this parameter, as well as its specific values, establish various state rules and standards approved in a particular country. In Russia, it is also known in technical documentation, literature, catalogs as conditional pressure, which is explained by the fact that this term was renamed in 1986 in connection with the release of new GOSTs to bring the designation to international standards. Initially, the new standards upheld the designation Py as an alternative to the new designation PN(also used notation rnom), these designations were used for marking technical products. However, since January 1, 2011, this alternative in the standards regarding the use of the obsolete designation ( Py) was excluded[ source not specified 85 days]. Thus, the only correct designation for the nominal pressure at present is PN.
Examples of established standards and regulations
Rated pressure(in hydraulic drive, pneumatic drive and lubrication systems) - the highest overpressure at which the device must operate for installed resource(service life) while maintaining the parameters within the established norms.
Rated pressure(in water supply and sewerage systems) is the constant internal overpressure of water that pipes and fittings can withstand during their entire service life (50 years) at a water temperature of 20 °C.
concept nominal pressure it is used according to GOST 26349-84 for fittings and connecting parts of pipelines, such as flanges, bends, tees, etc., the same standard establishes specific values \u200b\u200bof the nominal (conditional) pressures used in this area.
Row nominal pressures in the hydraulic drive, pneumatic drive and lubrication systems, GOST 12445-80 is established.
In the "Rules for the device and safe operation pressure vessels (PB 03-576-03)" defines the terms:
- Test pressure - the pressure at which the vessel is tested.
- Operating pressure - the maximum internal excess or external pressure that occurs during the normal course of the working process.
- Calculated pressure - the pressure for which the strength calculation is performed.
- Conditional pressure - design pressure at a temperature of 20 °C, used in the calculation of the strength of standard vessels (assemblies, parts, fittings).
Range of pressure ratings
When designing a hydraulic drive, the nominal pressure in the hydraulic system is assigned in accordance with the normal range of pressures in accordance with GOST 6540-68 and GOST 12445-80 (MPa): 0.63; 1.0; 1.6; 2.5; 6.3; ten; sixteen; 20; 25; 32. For pipeline fittings (ball valves, wedge and gate valves) and pipeline parts (tees, couplings, transitions, elbows, bends, etc.) are prescribed in accordance with the normal range of pressures according to GOST 356-80 (MPa): 0 ,one; 0.16; 0.25; 0.4; 0.63; 1.0; 1.6; 2.5; 4.0; 10.0; 12.5; 16.0; 20.0; 25.0; 32.0; 40.0; 50.0; 63.0; 80.0; 100.0; 160.0; 250.0.
Polypropylene pipes: specifications, application
What is polypropylene pipes? What are the scope of their application, technical characteristics, what does their marking mean? In this article, we will try to understand all these issues. And to understand why this type of pipe structures is truly considered unique materials, without which today it is impossible to imagine the installation or repair of plumbing, heating or sewer communications.
Polypropylene pipe - what is it?
Polypropylene is a type of thermoplastic polymer. It is made by combining (polymerization) molecules of ethylene gas derivative. The international designation of polypropylene is "PP". Next, we will consider polypropylene pipes in more detail: technical characteristics, properties and manufacturing technology of this new generation material.
Having a unique resistance to alkaline solvents and aggressive substances, the material is widely used in the installation of heating systems, water pipes and sanitary facilities. Can withstand low temperatures (up to -10 degrees) or high (up to +110 degrees).
The main properties of polypropylene pipes and their GOST
Modern polypropylene pipes, the technical characteristics and properties of which can be seen in the table, are reliable, durable and quite affordable. The main and indisputable advantage is the fact that they are not subject to corrosive processes, resistant to temperature conditions, easy to install, made of environmentally friendly clean materials. The main properties according to GOST are presented below.
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GOST |
Parameter |
Indicator |
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Thermal conductivity, at +200C |
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|
Density |
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Heat capacity at +200С (specific) |
||
|
Melting |
||
|
Tensile strength (at break) |
34 ÷ 35 N/mm2 |
|
| 18599 |
Yield strength elongation |
|
|
Yield strength (tensile) |
24 ÷ 25 N/mm2 |
|
|
Expansion factor |
A type of polypropylene pipe. Scope of application
The latest production technologies plastic products These are polypropylene pipes. Specifications are presented below. 
- PN10 is a thin pipe. The service life is approximately 50 years. It is used when installing cold water supply, underfloor heating (heat carrier temperature should not exceed + 450C). Standard sizes: Ø outside 20÷110 mm, Ø inside 16.2÷90 mm, pipe wall thickness 1.9÷10 mm. Nominal pressure - 1 MPa.
- PN20 - this type of pipe is used in cold water supply systems in residential or industrial buildings or hot water (up to + 800C). The service life is 25 years. Nominal pressure - 2 MPa. Dimensions: outer Ø 16÷110 mm, inner Ø 10.6÷73.2 mm, pipe wall thickness 16÷18.4 mm.
- PN25 is a polypropylene pipe reinforced with aluminum film or glass fiber. By its properties it is identical to metal-plastic. The service life depends on the pressure inside it and temperature carriers. It is applied at installation of systems of heating and hot water supply. Nominal pressure - 2.5 MPa. Dimensions: outside Ø 21.2÷77.9 mm, inside Ø 13.2÷50 mm, pipe wall thickness 4÷13.4 mm
The main advantages of polypropylene pipes
What are the indisputable advantages of polypropylene pipes? The technical characteristics of polypropylene, according to manufacturers, are truly amazing. It is considered a universal building material for the installation and reconstruction of utilities in residential and industrial complexes. They have been successfully tested in independent European and world laboratories and have confirming quality certificates. Let's consider the benefits.
- Their main advantage is long term operation - about 50 years, and when used in a cold water supply system, they can serve up to 100 years.
- Thanks to a specially designed inner surface pipes that are constantly in contact with water, no deposits form on their surfaces.
- Noise isolation. When transporting hot water from a heating medium or with a simple flow of water, noises can occur. Polypropylene is able to absorb them.
- No condensation. The PPR polypropylene pipe is resistant to temperature changes due to low thermal conductivity.
- Light weight. Compared to their metal counterpart, they are 9 times lighter.
- Ease of installation.
- Additional maintenance is not required.
- Resistance to acid-base substances.
- The elasticity of the polypropylene pipe is very high.
- Affordable price.
Product data sheet pn25
Not so long ago, manufacturers developed and mass-produced a polypropylene pipe pn25. Its technical characteristics are described in detail in the product data sheet.
|
Characteristic name |
Values for polypropylene pipes: dimensions |
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|
63÷10.5 |
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Internal Ø |
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|
Specific heat capacity |
1.75 kJ/kg0С |
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|
Ø tolerance |
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|
Linear expansion, (1/0С) |
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|
Heating time during welding |
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|
Roughness coefficient(equivalent) |
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|
Cooldown time, (seconds) |
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|
Tensile strength |
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|
Regulatory series |
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Elongation at break (relative) |
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|
Weight (kg/linear meter) |
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|
Tensile yield strength |
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|
Melt flow rate (index) PPR |
0.25 g/10 min |
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|
Thermal conductivity |
0.15 W m/0C |
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|
Heating time during welding |
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|
Elastic modulus PPR |
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|
Pipe socket depth (minimum) when welding |
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|
Pipe density (equivalent) |
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|
Volume (internal) linear meter / l |
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|
Elastic modulus PPR + fiber |
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|
Dimensional ratio(standard) |
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|
PPR Density |
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|
Pressure (nominal), PN |
25 bar | ||||||
|
Time of welding |
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A novelty in the metal-plastic industry with high quality and properties - polypropylene pipe pn25. Specifications are detailed in the table above. It was she who was able to solve the problem with a high coefficient of thermal expansion of plastic pipe products. This makes it possible to use it in the system drinking water supply, hot water supply, heating installation and other utilities. And also for the transportation of other liquids or gases that are not aggressive with respect to the materials from which they are made.
Design features
Layers with inner and outside made of special polypropylene brand PPR100. In it, the percentage of fiberglass fiber is at least 12%. The inner layer is made from the same material, but the fiber content is increased to 70%, and also with a red dye content. The presence of fiberglass fiber in the composition of the pipe reduces the level of deformation from temperature effects, but, unfortunately, cannot cope with oxygen diffusion.
What is the reinforcement of polypropylene pipes. Types of reinforcement
Consider universal pipes reinforced polypropylene, their technical characteristics, types of reinforcement, where they are used. Special reinforcement makes it possible to use in a heating or hot water supply system. In addition, they are not only famous for their long operational life but also high quality and efficiency. To date, there are two methods of reinforcing this type of product: fiberglass and aluminum. Let's consider each of them separately.
fiberglass reinforcement
Fiberglass reinforcement is three-layer construction pipes: two layers of polypropylene (internal and external) and a fiberglass layer. Marked as PPR-FB-PPR. Such an abbreviation in the marking confirms the monolithic structure and fiberglass reinforcement. During installation, these products do not need the need for calibration or stripping, experts recommend installing more additional fasteners during installation.
Reinforcement with aluminum
Pipe products with such reinforcement are a material for the installation of heating or hot water systems with high level structural rigidity. They are identical in strength to metal counterparts with thin walls. On their surface, the PPR-AL-PPR marking must be present. Reinforced with two layers of aluminum: the first is perforated with small holes, and the second is solid and solid over the entire surface of the pipe structure. When installing heating, the pipe needs to be stripped of the aluminum layer, only the polypropylene layer is soldered. If the technology is correctly implemented, then the mounted system will work long years no problem.
Polypropylene and its application in the sewer system
So, we found out that polypropylene as a pipe material is highly resistant to aggressive alkaline and chemical substances. Therefore, to the question "which pipes are better to choose for engineering communications?" the answer is unequivocal - modern polypropylene sewer pipes. Technical characteristics: stability, strength and durability. In addition to resistance to the effects of aggressive substances on them, and there are a lot of such in gutters, they will also serve quite well. a long period. They are not affected by corrosive processes in comparison with metal pipes. Pipe length for sewer system is about 4 meters, the diameter of polypropylene pipes (technical specifications contain such information) is from 16 mm to 125 mm. That is, their scope in the sewerage system is quite wide. They are connected to each other by diffuse welding or using special fittings.
Polypropylene Valtec pipes
Today, there are a lot of offers from manufacturing companies of these products for buyers in our country. And when choosing the material for the gasket engineering systems sometimes it is quite difficult to make a choice in favor of one of them. By appearance they are exactly the same, and differ only in manufacturing technology. And even then, if a person is incompetent in the issue of pipe products, then he is unlikely to understand the characteristics either. This is especially true for new firms that have recently appeared on the sales market.
Italian manufacturers Valtec present their new Valtec polypropylene pipes to the buyer. Specifications: great quality, new manufacturing techniques, durability and reliability. Moreover, this company has occupied a leading position in the sales market for several years. Its products have always been and are in demand. The quality is high due to the fact that the company keeps pace with the development of new technologies and introduces them into its production. Manufacturers give a 7-year warranty on the goods.
The price for the entire range of products is quite affordable. There are always available integral for cold water supply systems and composite polypropylene pipes reinforced with glass fiber or aluminum with a section diameter of 20 ÷ 90 mm. Employees of the company are very closely monitoring the quality of products, so errors or deviations from the standards are completely excluded. Produced in special tubes up to 4 meters with printed markings, with accompanying documentation and certificates.
PPRC pipes
These are pipes made of high temperature polypropylene. They are produced with a section diameter of 20÷160 mm. Reinforced with fiberglass or aluminum. Their main difference is small indicators of thermal expansion, low pressure loss. The production technology fully complies with GOST and the requirements of foreign standards. What are polypropylene pipes pprc? Specifications, properties and advantages of the plastic product: 
- low thermal conductivity;
- high level of sound insulation;
- resistance to corrosion processes;
- resistance to aggressive substances;
- high strength;
- resistance to bending more than once;
- environmentally friendly material;
- ease of installation;
- affordable price;
- long service life.
The use of polypropylene in the water supply system
Plastic pipe products rapidly entered the list of demanded building materials, polypropylene water pipes became no exception. Specifications, advantages and disadvantages are presented below.
Advantages:
- resistant to corrosion;
- service life - from 50 years;
- zero conductivity, hygiene;
- ease of installation;
- do not require additional care;
- affordable price;
- ability to withstand pressure of about 20 bar;
- excellent thermal insulation.
Disadvantages:
- do not withstand temperatures over 1000C;
- inability to repair or repair;
- welding work required.
Produced in different color schemes: grey, green, black and white. The color of the pipe does not depend on the properties and quality, except for black. It has the ability to protect it from ultraviolet radiation. For the installation of the water supply system, pipes with a diameter of 16 ÷ 110 mm are used. For cold water supply, pipes labeled PPH homopolymer or PPB block copolymer are suitable. To supply hot water or heating, pipes marked PEX-AL-PEX are used. They are reinforced with either fiberglass or aluminum.
Classification of polypropylene pipes
All polypropylene pipe products are classified in a certain way. 
- PPB - marking means that these are pipes with mechanical strength advanced level, polypropylene pipes are used for heating. Characteristics: reinforced (fiberglass or aluminum foil), strong, durable, affordable.
- PPH - marking of products with large diameters. Used in ventilation systems or in cold water systems.
- PPR is the most popular and versatile brand. Its versatility lies in the fact that it is able to carry high temperatures water flow. It is used in hot water supply and heating systems.
All these three brands differ from each other only in the type of plastic used in the manufacture. They include special additives which make them more flexible and durable.
How are modern taps for water and gas marked? e.g. DN 15, PN 40? what does 1-1/4, 1-1/2 mean?
ambulance
1-1/4 is called an inch and a quarter, i.e. 32mm. i.e. DN-32; 1-1/2 inch and a half, i.e. 40mm. or DN-40. What DN what Du is nominal (conditional) INTERNAL! diameter of the pipe opening, since the outer diameter of the pipe varies depending on the wall thickness. The wall thickness is determined by the scope of the pipes. (reinforced, normal, light)
Uncle from the future...
You have already answered this question absolutely correctly.
DN - nominal bore in mm (here 15)
PN - nominal pressure (here 4 MPa or 40 atmospheres)
fractions - thread size in inches (1 inch = 2.54 cm)
And there are markings indicating the type of material.
Type in a search engine - there is a lot of information