API PUBL 306-1991

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An Engineering Assessment of Volumetric Methods of Leak Detection in Aboveground Storage Tanks

Published By	Publication Date	Number of Pages
API	1991	43

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Description

Though volumetric methods of leak detection have been used successfully to reliably detect small leaks in underground storage tanks, their performance in large aboveground storage tanks (ASTs) is unknown. This document provides the results of an engineering assessment of volumetric methods for detecting small leaks in large ASTs. To assess the environment under which a volumetric leak detection test might be conducted on an AST, a series of experiments were done on a 114-foot-diameter AST containing a heavy naphtha petroleum product and located at the Mobil Oil Refinery in Beaumont, Texas. Data concerning normally occurring volume changes that are not associated with a leak were provided by (1) precision level measurement systems and (2) horizontal and vertical arrays of thermistors placed in two locations: inside the tank, immersed in the product, and outside the tank along its external wall.

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