The changing of state from a vapour to a liquid is called condensation: when there is a sudden temperature difference between the substance in the form of a vapour (e.g. water in the air) and a colder wall, it is likely that condensation will form.
In the case of the passage of water near heat sources, in order to avoid condensation
phenomena, it is preferable to insulate the pipes and fittings of the part concerned.
For refrigerated water systems, pipes and fittings with suitable insulating sheaths should be installed on the appropriate walls in order to reduce condensation phenomena.
The use of stainless steel pipes and fittings in systems guarantees the maximum protection from potential corrosive phenomena caused by condensation.