Explanation of Symbols
8.1 Introduction 12
CSW
Correction for Sediment and Water.
CTL Correction for Temperature of the Liquid. Compensates for the effect of temperature on a liquid. Corrects a volume at an observed temperature to a standard temperature. This is the same as VCF. CTSh Correction for Temperature of the Shell. The correction factor for the effect of the temperature, both ambient and liquid, on the shell of the tank. FRA Floating Roof Adjustment. The adjustment made to offset the effect of the displacement of the floating roof. FW Free Water quantity deduction (may include bottom sediment). The water present in a container which is not suspended in the liquid hydrocarbon. GOV Gross Observed Volume. The total volume of all petroleum liquids and sediment and water, excluding free water, at observed temperature. GSV Gross Standard Volume. The total volume of all petroleum liquids and sediment and water, excluding free water, corrected to a standard temperature such as 60 ° F or 15 ° C. GSW Gross Standard Weight. The weight (or mass) of the GSV quantity. NSV Net Standard Volume. The total volume of all petroleum liquids excluding sediment and water and free water, corrected to a standard temperature such as 60 ° F or 15 ° C. NSW Net Standard Weight. The weight (or mass) of the NSV quantity. TCV Total Calculated Volume. Gross standard volume plus free water. TOV Total Observed Volume. Total measurement volume of all petroleum liquids, sediment and water, free water and bottom sediments at observed temperature. TSh Temperature of the tank Shell. VCF Volume Correction Factor. This is the same as CTL. These two symbols are interchangeable. CTL is used in all equations in this standard. WCF Weight Conversion Factor. A factor which converts a volume, usually at standard temperature, to mass or apparent mass.
It is now necessary to gather all the information determined from the preceding sections into one place and perform those calculations needed to arrive at the required quantity.
8.2 Explanation of Symbols This section makes frequent reference to various symbols and abbreviations, especially in reference to mathematical formulae. It is important to be familiar with these symbols and abbreviations as they are commonly used throughout the petroleum measurement industry. This table gives an explanation of these symbols.
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