A tank blanketing with spring-loaded, self-acting pressure regulators in overpressure, usually in the millibar range.
Overpressure blanketing
Overpressure blanketing
Purpose
Here you can see an example of STORAGE with INERTGAS. The overlay is used to maintain a slight overpressure compared to the atmosphere in storage tanks, stirred tanks or other volumes. This effectively prevents the ingress of air, oxygen and/or moisture and thus oxidation or other unwanted chemical reactions.
Pressure
The two necessary regulators are usually set and sealed, for example: Pressure reducing valve 20 mbar Overflow valve 50 mbar. The minimum difference between the two set values should be at least 15 mbar. If nitrogen and thus product loss is to be minimized, the two setting values must be set further apart. This prevents nitrogen from being added even by small temperature fluctuations.
Performance
The outlet volume from the tank determines the capacity of the reducing valve; the capacity of the overflow valve must be matched to the inlet volume.
