The sanitation installations are the ones used to collect the wastewaters, transport them through channels, pumps and other procedures, treat and pour them to make them go back to the natural environment.
Domestic and industrial wastewaters, phreatic and rainwater are transported by pipes which are subjected to a demanding effort.
In comparison to the pipes of other materials, like the concrete, the plastic pipes offer a series of advantages in sanitation applications that we want to highlight.
Which are the advantages of the plastic pipes?
Tightness of the Joins
It is the main parameter that we use as a guide when we analyse the performance of these sanitation pipes. The fulfilment of the normative UNE-EN 13476 guarantees that they have success in the ‘Tightness of the joins with joints with elastomeric tightness’ test.
The tightness tests with crushing and angular deviation show that they have the best guarantees.
Behaviour to abrasion
The presence of abrasive solid elements and other ones like sands in rainwater and wastewaters makes the pipes to exceed successfully this phenomenon. The Darmstadt Technical University (Germany) uses a method with which it can be found the resistance to abrasion.
NOTE: So, a pipe of 1 metre long suffers 400.000 water cycles, sand and gravel, after which it is, measure the loss of the wall thickness which has suffered the pipe. The results point out that the concrete ‘reduces’ between 0.7 and 2.2 millimetres every 100.000 cycles, and 0,1-0,2 millimetres in the case of plastic pipes.
The concrete and metal pipes are much rougher than the plastic ones, which imply adherences and incrustations with the pass of the time, which end by reducing the diameter of the conduction.
The plastic pipes are capable to release the same flow with a reduction of the internal diameter of the pipes. With the same diameter, a concrete pipe will need more slope to empty the same water flow.
Resistance to Corrosion and Chemical Effects
While the plastic materials are inert face up to the effect of the hydrogen sulphide or acid sulphide, the concrete, fibre cement and cast-iron pipes result affected by the corrosion which is originated by the sulphides, as in their composition they have cement.
On one hand, the chemical and biological resistance of the plastic materials is demonstrated. This information is collected by both the UNE 53389 IN report and the ISO/TR 10358 International Technical Report.
It is estimated that the plastic pipes can be installed five times quicker than the concrete pipes due to its lower weight. The reason is the lower density of the plastic pipes.
As a consequence, it is saved in machinery and handling time. It is also avoided to have the trench open much so much time with the following annoyances.
All the aforementioned factors affect in a lower cost in the use of the plastic pipes.
Due to the higher resistance to the chemical agents, corrosion and abrasion, it is extended the durability and it is avoided the expensive reparations of failures. To all this, it is added the higher lightness which allows to save transportation and installation costs.