The NGAT is installed
at a pre-determined local area high point.
As gases enter the NGAT
chamber, the liquid level in the chamber descends and the buoyant titanium Float
descends with it.
The titanium Float has a permanent
magnet built inside it. The position of the Float (and thus the liquid level) is
constantly indicated on the external Float Level Indicator, which shows the
position of the magnet.
Once the Float and Float Level Indicator
reach a minimum calculated level within the NGAT (determined for each NGAT
based on system parameters) the valve is opened and the gas is released to a
collection system. As the gas is relaesed, the Float and Float Level Indicator rise.
When the Float Level Indicator shows the NGAT
is once again "full", the valve is closed.
This passive design
provides constant, literal compliance with Tech Spec requirements by
constantly proving that the system is "full" of water while promoting ALARA
Frequent visual monitoring of the Float Level
Indicator not only ensures that the system is "full", but allows for air
accumulation trending analysis which can greatly assist in the monitoring of