Protection against oxidation and corrosion
The nitrogen atmosphere protects the drain tank and expansion vessel
Mineral as well as synthetic thermal oils will oxidize when exposed to air at temperatures of 80 °C and above.
The oxidation leads to tar-like products in the oil which can plug strainers, pipes and heat exchangers. Oxidation products also increase the acidity of the oil. This can lead to corrosion in particular in the expansion and drain tanks, in the overflow pipe but also in other parts of the system. The typical starting point for oxidation of thermal oil is in the expansion tank which is vented to the atmosphere. Combined with light ends of the thermal oil and air in the expansion and drain tank, an explosive atmosphere may form.
The NESS nitrogen blanket prevents this because the oxygen in the system is replaced by nitrogen.
In many Nitrogen blanket systems the expansion tank is superimposed. The NESS system also covers the drain tank. This has following advantages:
The nitrogen blanket in the drain tank counteracts the formation of condensate (water) and thus corrosion. In addition it prevents the accumulation of explosive gases in the drain tank. The large nitrogen volume (expansion and drain tank) reduces the effects of pressure changes, significantly reducing nitrogen consumption over time.
The NESS Nitrogen blankets work fully automatic.
For optimal performance, the NESS Nitrogen blankets work completely automatic and can be retrofitted into existing systems.
Functionality Nitrogen blankets: