Polyethylene pipes for water supply are used for constructing water-supply systems and are made from high density polyethylene, PE80, PE100 and PE100-RC, in accordance with the SRPS EN 12201 (MRS ≥ 8 MPa, i.e. MRS ≥ 10 MPa) to a quality standard that guarantees undiminished strain resistance even after 50 years of use.
Polyethylene pipes are used for public, private and industrial water supply systems, including construction of underground, underwater and surface pipelines and water systems inside and outside buildings. Permanent and temporary heat load limits are 60ºC and 80 ºC, respectively. The pipes are resistant to low temperatures, Owing to outstanding chemical resistance of HDPE, the material is highly resistant to strong acids and bases. In addition to this, the pipes are resistant to mild oxidants and reducing agents.
The advantages of the pipes produced from the PE80 and PE100 material include:
- The material is absolutely non-toxic and fully inert in contact with water,
- No impact on odour and taste of water
- No deposits of lime are formed and consequently there is no narrowing of the gauge of water passage over long-term use,
- UV-resistant and resistant to temperatures -30°C do +60°C,
- Very low loss of pressure owing to friction coefficient 10 times lower than in steel pipes,
- Easy assembly,
- Easy for transport and handling
The pipes made from PE100-RC are intended for installation in stone grounds, requiring no sand bed or backfilling of the trenches. The advantages of pipes made from PE100-RC include:
- Resistance to pressure points,
- Resistance to rapid extension and spread of fissures,
- Highest level of product reliability,
- Compatibility with classical PE pipes.
The pipes are composed of a single layer of material, with a homogenous cross-section of the wall and smooth inner and outer surfaces. The colour of the pipes is black, with blue longitudinal co-extrusion lines.
Pipes supplied in diameter DN 20 – 110 (mm) can also be manufactured as two-ply pipes, with white inner surface.
The pipes bear the following permanent markings at every metre of length, in accordance with the SRPS EN 12201-2:2014 Standard:
- Code of standard: SRPS EN 12201,
- Nominal diameter x wall thickness,
- SDR marking,
- Kind and type of material,
- Working pressure, PN,
- Producer’s sign and year of production.
The nominal (outer) diameter ranges between DN 20 and DN 630 mm, whereas the working pressure includes the options of 4, 6, 8, 10, 12.5, 16, 20,25 and 32 bar.
The pipes are packed in coils between 50 and 500 m of length (depending on the diameter and pressure). The coil drum requirement for the pipe is a diameter of at least 18 x d, in order to preserve the oval form of the pipe.
The selected nominal (outer) diameters and wall thickness dimensions, corresponding to the selected nominal pressures, are given in the table. The values presented in the tables and the pipe quality values are in accordance with the SRPS EN 12201 standard.
Polyethylene is a sturdy and flexible material which must be handled with care. Pipes must not be dragged over the ground and rough surfaces. Polyethylene pipes are stored under a roof or in the open air, owing to high resistance to UV radiation and temperatures between -30 º C and +60 ºC.
The pipes are laid in the ground, inside trenches of a varying depth, depending on the type of the pipe and the ground, in accordance with the project designer’s specifications. When laid in soil, the depth of the trench ranges between 0.8 m and 1.2 m, depending on the configuration of the ground and the pipe diameter.
Connection of a pipeline is by the means of flexible or fixed connections.
- Flexible joints are connections with fittings, fasteners and flanges.
- Fixed joints are performed using butt welding or electro-fusion welding.
Our company uses modern, attested equipment and certified welders for butt welding of water pipes.
Installation of pipelines is performed in accordance with Standard SRPS EN 805.
The lowest temperature for outdoor installation is + 5°C.
Following the installation, the pipeline is tested using the procedure defined by the designer, in accordance with SRPS EN 805, point 11.
The PE fitting and PE pipes are made using the same material, which enables a highly secure and efficient jointing. The standard groups of products of pre-fabricated fittings include: fastener, elbow, straight and V joints, as well as reducing joints. Tailor-made element designed in accordance with the customers’ requirements are also supplied. Once completed, every pipeline must undergo a pressure test, in order to secure the complete tightness of the pipes, connector, fittings and other components.