Tankvision Calculations
Endress+Hauser 27
8.1.1 Total Observed Volume - TOV
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The Total Observed Volume (TOV) is determined with the level information and the Tank
Capacity Table (TCT). The TOV is the volume observed at the present (temperature)
conditions.
The TCT is a tank specific table created by calibration holding the level to volume transfer
information. To differentiate the TCT for the Product and for the Water the TCT gets marked
with a P (P-TCT).
The level information nedded for this step is in innage which is the normal way the level is
transferred from the gauge. In case the gauge inputs ullage to the system a calculation into
innage is necessary beforehand (Ullage substracted from Mounting position).
Two more information can be derived from TCT and level:
• Remaining Capacity (RemCap) shows how much more product could be pumped into the
tank safely.
• Available Volume (AvailVol) indicates how much product can be pumped out of the tank
to the lowest (defined) possible point e.g. the tank outlet.
8.1.2 Free Water Volume - FWV
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In some cases the tank can also contain water. It can derive from the delivered crude oil, the
processing or by tank breathing. The (innage) water level information together with a Water
Tank Capacity Table (W-TCT) result in the Free Water Volume. It is substracted from the
TOV.
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