General structure and characteristics of P.P.


olypropylene pipes can also be used in pressurized tubing network but their application range is limited to low-pressure lines (indoor consumption, sanitary cold and hot water piping). Now these pipes are used in delivering chemicals and in waste water systems.

Advantages of polypropylene pipe and fittings

1- It does not rust and corrode and the water inside it is completely sanitary.

2- Roughness of its inner surface is approximately zero. Therefore, it does not suffer from pressure drop.

3- It can bear the pressure of 20 atmosphere at normal temperature and they pressure of 10 atmosphere at 95ͦ C

4- It is resistant to acids and bases.

5- It is secure in built-in plumbing and elegant in external installation.

6- The coefficient of linear expansion is low and on a par with metals.

7- It is impenetrable is gasses.

8- It can be formed by hot air of 140oC.

9- It is installed easily and quickly.

10- It enjoys high quality and long service life

11- It is resistant to corrosion, biological effects and chemicals. One the intrinsic characteristics of polymeric pipe is resistance to chemical effects and erosion caused by building materials such as line and cement.

12- It is resistant to frost. Insulation of the pipe prevents it from freezing

13- Low pressure drop

14- Low sweating and heat loss

15- It is resistance to abrasion

16- Due to the smoothness of its inner surface and its special material, it does not make any noise of vibration. The noise which is made by the vibrations of water flowing through the pipes and fittings is considered as a disadvantage for metal kinds of pipes, but in polypropylene pipes this noise is decreased to the minimum level.

17- It is appropriate for application areas prone to earthquake.

18- It doesn’t sediment due to the smoothness of its inner surface.

19- It is resistant to electricity. Polypropylene pipes and fittings are at the weakest electrical conductivity to the sporadic electrical currents and connections in the surrounding. In other words they operate as an insulator and as a result, maintain their high quality.

20- It is lightweight polymeric pipes are lighter than the other kinds of pipes, so they can be delivered easily and installed economically.

21- It is impenetrable to oxygen.

22- It is economical both in time and cost. Its long service life and low-cost installation can considerably reduce the total cost.

23- Heat insulation and nonconductivity of polypropylene pipes and fittings reduce heat loss of the fluids flowing inside the pipes to the minimum. This characteristics in turn, prevents forming of dense clumps and masses on the other surface. Accordingly, these pipes require less insulation in comparison to metal ones

24- The light cannot penetrate the pipes and fittings. So the taste of water doesn’t change.