Actual
Veritable Calibration.
Theoretical
Hypothetical Calibration.
Reference Point
Fixed point of mark at or near the top of the tank, the highest point of the tank or otherwise noted on the calibration chart.
Strike Point
Fixed point of mark at or near the top of the tank, the highest point of the tank or otherwise noted on the calibration chart.
Reference Depth
Distance from the reference point to the bottom of the tank and noted on some calibration charts.
Gaging Height
Distance from the reference point to the bottom of the tank and noted on some calibration charts.
Guage Height
Distance from the reference point to the bottom of the tank and noted on some calibration charts.
Ullage
Distance from the reference point to the surface of the liquid in a tank.
Outage
Distance from the reference point to the surface of the liquid in a tank.
Inage
Depth of liquid in a tank measured from the surface of the liquid to the tank bottom.
Shell Full
Capacity designates that a tank is filled to it's shell capacity.
Nominal Capacity
97% of shell full capacity.