The pipes for gas pipelines
The pipes for gas pipelines are made of polyethylene that is in full compliance with the SRPS G.C6.661 standards. The production and the quality control is in accordance with the following relevant international and national standards: EN 1555, ISO 4437, SRPS G. C6. 661.
The pipes that are used in gas pipelines installations are made of high-density polyethylene PE80 or PE100 (MRS ≥ 8 Mpa, i.e. MRS ≥ 10 MPa), the quality of which is such that it guarantees the pipes to be able to endure the same amount of pressure even after 50 years of use.
Polyethylene pipes are easy to transport and handle. They are flexible and resistant to vibrations, seismic shocks and shifting of the soil. The allowed permanent thermal exposure is up to +60ºC, while the allowed temporary thermal exposure is +80ºC. The pipes are joined (depending on the diameter) by either electro-fusion or butt welding.
The pipes are supplied in the standard black colour, with co-extruded yellow lines and with the following inscriptions inserted on every meter of length: the kind and type of material, outer diameter, operating pressure, SRPS G.C6.661, manufacturer’s code, the year of production and the length of the coil. Both the outer and the inner surfaces are smooth, with the diameter ranging from Ø 20 mm to Ø 500 mm, designed for the operating pressure of 1, 4, 6 and 10 bar, depending on the material. The listed diameter is the outer diameter of the pipe.
Polyethylene pipes with a diameter of up to Ø 110 are delivered in coils of the overall length in the range between 50 and 200 meters, while the larger diameter pipes are delivered as rods 6 or 12 meters long. The smallest diameter of the coil core for pipes must be at least 18 x d and in any case it must secure that the roundness of the pipe is preserved.
PE 80
PE 100
