Gas pipes that are used in construction of gas pipelines, made of high-density polyethylene PE80 or PE100 (MRS ≥ 8 MPa i.e. MRS ≥ 10 MPa) of a high quality that guarantees that the pipes will endure the same strain even after 50 years. The production and quality control are in accordance with the national SRPS EN 1555 standard. The material is non-toxic and easy for handling and transportation.
The pipes are flexible and resistant to vibration, seizmic shocks and shifting of soil. The allowed permanent temperature load is up to +60ºC, whereas temorary allowed load is up to +80ºC. Due to the low friction coefficent, the loss of presure is also low. The pipes are joined (depending on the diameter) using connectors or welding, which can be either electro-fusion or butt welding.
Produced in the standard black colour, with co-extruded yellow lines, the pipes bear the following markings:
- Standard code: SRPS EN 1555
- Outer diameter,
- SDR marking,
- Kind and type of material,
- Marking: GAS,
- Manufacturer’s sign,
- Year of production,
- Signs to mark the length of the coil, placed on a distance of
The pipes have smooth outer and inner surfaces, and are produced in diameters ranging from DN 20 mm to DN 500 mm, for working pressures of 1, 4, 6 and 10 bar, depending on the class of the material used. The nominal diameter is the outer pipe diameter. The polyethylene pipes of the diameter ranginng from DN 20 to DN 110 are packed in coils between 50 and 200 m of lenght, while the larger-diameter pipes are supplied in 6m and 12m rods. The drum used to make the coil of the pipe must not have a diameter under 18 x d, fashioned so as to preserve the oval form of the pipe. The polyethylene pipes used for the supply of gaseous fuels can be laid under the ground and under water. The methods used for laying the pipes are defined in the ‘Manual on Technical Norms for Design and Laying Distributive Gas Lines made of Polyethylene Pipes“.