Polypropylene pipe DN75 PN12

Polypropylene pipe DN75 PN12

(PP-R DN75x6,9 mm)

What to consider when choosing Polypropylene pipe DN75 PN12

Polypropylene pipe DN75 PN12 (PP-R Ø75×6.9 mm) is intended for water supply, heating and ventilation. It is important to take into account the conditions of use and the compliance of the pipe characteristics with the set loads. The strength of the pipe depends on the wall thickness, not on the reinforcement.

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Main characteristics of polypropylene pipes

• Polypropylene pipe DN75 PN12 has a service life that exceeds that of metal analogues.
• Smooth inner surface reduces pressure losses. Energy savings up to 15%.
• Low thermal conductivity reduces the likelihood of condensation forming.
• Polypropylene pipe DN75 PN12 is made of plastic that is not susceptible to corrosion, does not require painting.
• The low weight facilitates transportation and assembly.
• The pipes are suitable for use during winter.
• The low cost makes them an economical solution.

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Types of raw materials for the production of PPR pipes

1. PP-H (homopolipropilen): for industrial water pipes and ventilation.
2. PP-B (bloc- copolymer): frequently used for external sewage.
3. PP-R (random copolymer): main material for water supply and heating systems.

For high temperatures, PP-R is used, which withstands up to +110°C. Products without UV protection cannot be used outdoors.

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Polypropylene pipe DN75 PN12. Marking

Pipe marking includes:

• short symbol of the material;
• standard aspect ratio SDR (S series);
• nominal outer diameter;
• wall thickness in millimeters;
• maximum working pressure class, in MPa;
• PP-R – the material from which the pipe is made (in this case, random copolymer);
• PN20 – maximum operating pressure at 20°C;
• SDR6 – dimensional ratio between pipe diameter and wall thickness (20:1.9);
• 50×6.9 – diameter x wall thickness (nominal values); class 1/1.0 MPa – for hot water at 60°C;

Example of designation for a three-layer polypropylene pipe with a nominal outer diameter of 50 mm and a wall thickness of 6.9 mm:

Polypropylene pipe DN75 PN12 (PP-R Ø75×6.9 mm)

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Dimensions and areas of use of PPR pipes

• PN10: for cold water supply and air conditioning.
• PN16: for systems with temperatures up to +60°C.
• PN20: universal variant for water supply and heating.
• PN25: suitable for high load systems with reinforcement.

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Types of reinforcement

• Fiberglass or basalt: improve pipe stability.
• aluminum: reduces linear expansion, but requires special preparation for installation.

Reinforcement prevents pipes from expanding when heated, but does not increase their strength.

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Choosing the pipe diameter

The diameter depends on the required water flow rate and the characteristics of the system. For example, for apartments, pipes of 20-32 mm are recommended, for private houses - up to 40 mm, and for industrial facilities or multi-family buildings - from 50 to 90 mm.

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Installation of polypropylene pipes

Non-removable connections of polypropylene pipes are made by welding, using special equipment — welding machines, known as “solders”. Accessories for the machine are selected depending on the diameter of the pipe and fittings. The main stages of assembly:

1. Preparation:
   • Before starting work, it is necessary to remove the outer layer of reinforcement to ensure a quality connection.
   • Cleaning and degreasing of prepared pipe parts — mandatory step.
2. Cutting:
   • The pipes are cut perpendicularly using special scissors.
3. Heating:
   • Choose the accessory according to the pipe diameter and heat the soldering iron to 260°C.
   • The device's warm-up time varies between 5 and 20 minutes, depending on the model.
4. Connecting:
   • Both elements heat up simultaneously. The heating time depends on the pipe diameter and environmental conditions.
   • Heated details come together quickly and precisely, without misalignment.
5. Cooling:
   • The joined elements are allowed to cool completely. It is important to avoid bending, twisting or applying pressure to the weld during this stage.

The result: Precise adherence to technology ensures a durable, leak-proof, load-bearing and long-lasting joint.

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Conclusion Polypropylene pipe DN75 PN12 (PP-R DN75x6.9 mm) — is a durable, economical and environmentally friendly choice for engineering systems. Consider the conditions of use, pipe characteristics and choose trusted manufacturers. An excellent addition to heat pumps in building water supply and cooling systems. Large diameter pipes are also used in water supply systems for objects with large heating surfaces. The main applications are in industries, manufacturing enterprises, as well as for geothermal circuit collectors or hydraulic mixers.

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