The volume of a vertical cylindrical storage tank in custody or inventory service for crude and refined products is established by tank calibration. The calibration process simply involves using a calibrated tape with a given tension to measure the tank circumference of each and every course on the tank by a manual method as detailed in API and ISO standards.1, 2
Tank external circumference may be measured with a tape in one single strap (i.e., using a tape that can traverse the entire tan circumference). The tape handling becomes extremely difficult due to its weight as the tank diameter increases. It becomes more and more difficult to maintain the tape in perfect contact with the tank she
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