Water contains numerous dissolved substances such as gases, salts and many impurities, and its use in water systems means that furring, corrosion and the forming of deposits may occur.
The UNI 8065-1989 Standard Treatment of water in heating systems for civil use sets forth the chemical properties of water used in civil heating systems, specifically:
> Hot water heating equipment.
> Low pressure steam boilers with high condensate recovery.
> Water systems with water at a temperature higher than boiling point and at atmospheric pressure up to a maximum temperature of 180°C.
> Plants for the generation of hot sanitary water.
The most common treatments for heating systems include:
> Filtering.
> Degassing.
> Softening and demineralising using resins.
> Reverse osmosis and ultrafiltering.
After the filtering and softening processes, water should not form deposits or encrustations but there is still the problem of corrosion to be dealt with, which means that a quantity of anti-corrosive and protective products have to be employed. The system that we recommend to clients has a tank where the required concentration of a reagent solution is prepared by a dosing pump managed by a pulse counter. Each pulse of the counter corresponds to a precise quantity of water that has flowed through and the pump injects the correct quantity of reagent solution into the system.