Vertical Oil Storage Tank (VST) is a capacity measure described in the Legal Metrology (General) Rules, 2011's ninth schedule, Part II & III. This Schedule is applicable only to tanks meant for bulk storage of petroleum or liquid petroleum products.
Calibration is a method of finding the volume of a tank. The tank is inspected 'in situ' and is calibrated using standard engineering techniques. It also gives the volume of a tank depending on the height of fluid in the tank - Using a calibrated dip rod and a dip chart, one can directly find the volume of fluid in a tank.
Storage tanks are used to store fluids (liquids/gases), which are cold or hot. A storage tank can have flat bottom, fixed or floating roof. A storage tank can be above ground or under ground, cylindrical in shape, made of steel with elliptical/conical heads. Large storage tanks are commonly used to store Petroleum products.
(Legal Metrology (General) Rules, 2011's ninth schedule, Part I deals with the Calibration of Vehicle Tanks for Petroleum Products and other liquids.)
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