Closed Gauging System
Closed Gauging System :
A method of obtaining measurements of the tank contents without opening the tank. This may be accomplished by using automatic tank gauges or by taking measurements through a pressure/vapor lock standpipe. This type of gauging is done extensively on vessels with inert gas systems. Such a system that allows no vapors to be lost to the atmosphere is a true closed system while other types that allow minimum vapors to be lost to the atmosphere are called "restricted systems"
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