Total Calculated Volume (TCV)
Definition - What does Total Calculated Volume (TCV) mean?
Total Calculated Volume, abbreviated as TCV, is the total volume of all petroleum liquids, sediment and water, corrected by the appropriate temperature correction (Ctl) for the observed temperature, API gravity, relative density, and density to a standard temperature such as 60°F or 15°C. It is also the volume corrected by the applicable pressure factor (Cpl) and meter factor and all free water measured at observed temperature and pressure. Total calculated volume is equal to the gross standard volume plus free water volume.
Petropedia explains Total Calculated Volume (TCV)
In order to find out the total calculated volume (TCV) of all petroleum liquids, it is important to first find out the gross standard volume (GSV) of all petroleum liquids, sediment and water as well as the Free Water Volume because the formula for calculating the TCV is:
Total Calculated Volume (TCV) = Gross Standard Volume (GSV) + FW
GSV can be found using the formula, GSV = GOV x CTPL where, GOV is Gross Observed Volume and CTPL is Correction for the Effect of Temperature on a Liquid.
Free water volume (FW) can be found out from the vessel tank capacity tables which are entered with the FW innage or ullage.
TCV for Shore Tanks
Gross Observed Volume (GOV) for shore tanks is given by the following formula:
GOV = [(TOV – FW) x CTSh]±FRA
Where, TOV is Total observed Volume
FW is free water for which adjustments need to be done
CTSh is Correction for the Effect of Temperature on the Steel Shell of the Tank
FRA is Floating Roof Adjustment.
Therefore, put the value of GOV obtained using the above formula in GSV formula to obtain GSV value for Shore Tanks. Once GSV for shore tanks is obtained, TCV for shore tanks can be obtained by putting GSV values in TCV formula.
TCV for Marine Tanks
Gross Observed Volume (GOV) for Marine Vessel tanks is given by the formula below:
GOV = (TOV ± trim or list correction) - FW
Where, FW is free water volume.
Again, put the value of GOV obtained using the above formula in GSV formula to obtain GSV value for Marine Tanks. Once GSV for marine tanks is obtained, TCV for marine tanks can be obtained by putting GSV values in TCV formula.