Stainless steel resists bacteria

November 2017
Piping systems and materials used for the supply of drinking water: The water that comes out of our taps these days is getting stronger and stronger substances containing chlorine Treated for normal disinfection.
What effects can such substances have on the Longevity of the systems to have? Above all: Can some used for the pipelines Materials give off substances dangerous to human health when flowing through the chlorine-containing water?



Disinfecting the water coming from our taps is a common practice. Some chemicals, mainly chlorine-containing, are added to the water that comes out of our taps every day.

In addition, in the drinking water systems of buildings (primarily in buildings in which there is an increased risk of contamination, such as hospitals), "intensive treatments" with very high doses of chlorine are also carried out.
The purpose of these interventions is to contain the spread of bacteria, some of which are very dangerous, such as Legionella.





A big problem for drinking water pipelines: the legionella bacteria.

The Legionnaires' disease is a severe form of pneumonia. The bacteria responsible for this can spread in the water pipes if certain conditions exist, such as a temperature between 20 ° C and 45 ° C and the presence of a "Biofilms", an organic deposit that offers legionella an ideal ambience



The ones used for disinfection Choir based substances can attack most of the materials from which the water pipes are made.
These mixtures can be very aggressive, especially if they are added to the water in too high doses: they could cause great damage to the systems.


AISI 316L stainless steel and resistance to chlorine-containing compositions for disinfection




AISI 316L stainless steel, of which pressfitting Eurotubi fittings and pipes are made, offers increased resistance to Treatments with chlorine-based compositions, Treatments with chlorine-based compositions.



Plastic pipes made from polyethylene derivatives and water treated with chlorine-containing compositions

Compared to pipes made of stainless steel have so-called PEX pipes made of cross-linked polyethylene and even more the non-crosslinked PE-RT pipes limited life. This is especially true when they are used "under severe conditions", such as high pressure and high temperatures and when there is too much contact with water containing chlorine compounds for normal disinfection.




Several studies have shown that water containing chlorine compounds inside many pipes made of plastic materials causes the pipes to age prematurely, with all the problems associated with it.


Ultimately, many worrying studies have highlighted that the presence of chlorine dioxide, which is used for disinfection, in some PEX pipes can lead to more and more dangerous, so-called "hormone-active substances" being released into our drinking water.

You can deepen this topic in our scientific publication: "Long-term studio on the migration of volatile organic substances from PEX pipes (made of cross-linked polyethylene) and the effects on drinking water quality".

Page 9 - PDF document download here.



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