April 2019

Pressfittings for heating and air conditioning: when to choose carbon steel or AISI 316L stainless steel fittings with 304 pipes

A large percentage of pressfittings is used in the HVAC sector. For these applications, the carbon steel system is used the most, especially for economic reasons. We can see how, in certain cases, opting for a solution with AISI 316L stainless steel fittings paired with 304 steel pipes could be very advantageous in terms of savings.
The pressfitting system began 60 years ago for installing heating systems. Initially in the carbon steel variant, it was later introduced in the 316 stainless steel version, with the intent to also enter into the potable water installations market and then in gas systems and the industrial sector.

Piping systems for large industrial heating systems

Currently, on the market level, a large part of pressfitting sales is intended for the "HVAC" sector, in other words, for heating and air conditioning systems. We know for certain that the carbon system is more economical than the AISI 316L stainless steel variety.
When creating a plumbing system that is intended exclusively for heating, we can safely choose the carbon steel pressfitting. In fact, since it is a closed circuit system, under normal working conditions, the oxygen in the air does not enter the system and, therefore, cannot create corrosion.

Fittings and pipes for sports facilities and spas

When the requirements are more complex, for example when the system must be installed in particularly harsh environments with critical humidity and temperatures, such as those found in buildings with pools, wellness centres, hotels in high altitude mountains, or in industrial complexes where there are certain chemical substances, we can take into consideration Eurotubi Pressfittings in AISI 316L stainless steel paired with special AISI 304 stainless steel pipes, supplied exclusively by our affiliate, Vimoter.

Piping systems for industrial fluids

This solution is optimal, especially in cases in which the system to be created must be used for both heating and cooling. In fact, this last function always creates condensation outside the piping and in this case, using carbon steel is absolutely not recommended because the condensation could lead to corrosion on the outside surface.

The solution of 316L fittings with special 304 steel pipes definitely costs more than carbon steel but is also much less when compared to a system with both pipes and fittings made of 316L stainless steel. Plus, since it does not need to transport potable water, the latter solution would be a waste of money.

Pressfitting fittings in AISI 316L stainless steel - Combined with 304 stainless steel tubes

The choice of carbon steel or stainless steel with either 316L or 304 pipes is primarily based on the type of system: if it is only for heating, carbon steel is fine, but if it must also be used for cooling, it is best to opt for the stainless steel solution..

Second, if the system has particular needs for longevity and resistance to corrosion and other problematic environments, the ideal solution is 316L stainless steel fittings with 304 pipes. This solution will be repaid through years of service without heavy maintenance.

And finally, remember that only the special AISI 304 steel pipes provided by our affiliate "Vimoter", have the proper characteristics to be able to pair them with Eurotubi Pressfittings in AISI 316L steel.

Other news:
1. Pressfittings for heating and air conditioning: when to choose carbon steel or AISI 316L stainless steel fittings with 304 pipes
2. Pressfittings for heating systems inside covered stadiums and sports arenas
3. Eurotubi pressfittings for renovating the historic hotel “Leul de Aur” (Golden Lion) in Sebes, Romania
4. March 22 was World Water Day: how to make the most of it through the choice of piping
5. Eurotubi Pressfitting Video Course: swivel connectors
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