GROSS STANDARD VOLUME (GSV) The total volume of all petroleum liquids and S&W, corrected by the appropriate temperature correction factor (Ct1) for the observed temperature and API gravity, relative density, or density to a standard temperature such as 60°F or 15°C also corrected by the applicable pressure correction factor.


LOAD ON TOP (LOT)


The concept of allowing hydrocarbon material recovered during tank washing to be commingled with the next cargo.


NET OBQ


OBQ less free water in cargo, slop tanks and lines, and water in suspension in slop tanks.


NET OBSERVED VOLUME (NOV) The total volume of all petroleum liquids, excluding S&W, and free water at observed temperature and pressure.


ONBOARD QUANTITY (OBQ)


Cargo tank quantities of any material onboard a ship after de-ballasting immediately prior to loading. Can include oil, oil/water emulsions, water, non-liquid hydrocarbons and slops.


REMAINING ONBOARD (ROB)


Cargo or residues remaining onboard ship after discharge.


SEDIMENT AND WATER (S&W)


Non-hydrocarbon materials which are entrained in oil. Material may include sand, clay, rust, unidentified particulates and immiscible water.


SHIP’S COMPOSITE SAMPLE A sample comprised of proportional portions from running samples drawn from each tank on the ship.


SHIP FIGURES


Stated volume extracted from ship’s calibration tables based on measurements taken from cargo tanks.


SLOP TANK


A tank into which the tank washings (slops) are collected for the separation of the hydrocarbon material and water; the recovery most often becoming LOT (load on top).


TOTAL CALCULATED VOLUME (TCV) The total volume of the petroleum liquids and


TOTAL DELIVERED VOLUME (SHIP) It is defined as the Total Calculated Volume less ROB.


TOTAL OBSERVED VOLUME (TOV) The total measured volume of all petroleum liquids, S&W, and free water at observed temperature and pressure.


TOTAL RECEIVED VOLUME (SHIP) It is defined as the Total Calculated Volume less OBQ.


ULLAGE (OUTAGE GAUGE)


A measurement taken from the gauge reference point to the liquid level.


VOLUME CORRECTION FACTOR (VCF) The coefficient of expansion for petroleum liquids at a given temperature and density. The product of the petroleum liquid volume and the volume correction factor, equals the liquid volume at a standard temperature of either 60o or 15o


C. WATER (DIP) GAUGE


a) The depth of water found above the strike point, or b) To gauge for water.


WATER FINDING PASTE


A paste, which when applied to a bob or rule, is capable of indicating the water product interface by a change in colour at the cut.


WEDGE CORRECTION


An adjustment made to the measurement of a wedged shaped volume of oil, so as to allow for the vessel’s trim.


WEIGHT CONVERSION FACTOR (WCF) A variable factor related to density for use to convert volume at standard temperature to weight.


S&W, corrected by the appropriate temperature correction factor (Ct1) for the observed temperature and API gravity, relative density, or density to a standard temperature such as 60°F or 15°C and also corrected by the applicable pressure factor and all free water measured at observed temperature and pressure. (Gross Standard Volume plus free water).


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