Keterangan :

These pipes are used in Natural Gas systems at parts with 4 bars of pressure. Systems consist of steel pipes with 20 bars of pressure, 4 bars of middle lines and 0.4 bars of in-building lines. At sections with 20 bars of pressure, the use of Polyethylene pipes with composite structure has begun to be tested. After the standards are formed, usage will become widespread. Studies continue on in-building composite pipes that do not get affected from fire.

Polyethylene has 3 types depending on the density: high density, medium density and low density. Pipe pressure and rigidity increases while flexibility and blow resistance decreases with density. Natural gas pipes are preferred since flexibility and blow resistance of them are higher compared to the high density pipes.

Natural Gas pipes are in PE80 class. The environmental tension value for medium density that could currently be reached is 8.0 MPa. As this value increases wall-thickness will decrease and the amount of fluid flowing inside will increase. Since these pipes are in SDR11 group they are used at PN12.5 when used for water and as the safety coefficient increases to 2.5 from 1.25 they can be used at 4 bars of pressure in natural gas lines. Since Polymer chains are affected by Hydrocarbon, their safety coefficient is selected high. The pipes are produced as coils and this makes installation easier. Short lines could be installed and fitting, labor savings are provided since the welding amount is less.

In order to guarantee that no leakage of gas occurs, only electro fusion welding is used, which is the safest type of welding. The electric current is led through the copper wire that is placed inside the fitting. The wire, in which the current flows, warms up. The energy that is revealed makes the plastic melt. The volume of the melt plastic increases and through contacting, it makes the pipe melt, too. The pressure formed because of the compression at the intermediary part creates molecular welding. By means of its flexible structure it doesn’t get damaged because of earth movements and eliminates the bursting risk.

Because of its elasticity it is not affected by earthquakes.
It doesn’t lose anything from its elastic features even at -40°C.
Could be used at the construction site as coils.
Is highly resistant to chemicals.
Because of the flowing material inside and because of earth’s structure outside, it doesn’t corrode.
Since its density is 0.940 gr/cm3, it is eight times lighter than steel in weight.
Connection can be done outside the canal and later it can be placed into the canal. Thus the amount of excavation is reduced.
It doesn’t require accurate digging level by level.