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Electrical Resistance Tomography — Tanks

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Tech ID: 140
Project Overview

Electrical Resistance Tomography (ERT) is a geophysical imaging technique that maps liquids migrating through the soil by measuring the resistivity or voltage fluctuation caused by a migrating plume.

This project has three technology development goals. The first is development, demonstration, and technology transfer of ERT for monitoring tank leaks. If successful, the second goal is a full-scale demonstration on an underground storage tank during sluicing operations which will be scheduled in FY97. The third goal is to extend the data processing algorithms to three dimensions, for a three-dimensional map of the leak plume. In addition, the task includes preparation of a study to investigate the feasibility of using such a deployment technique and leak detection/monitoring (LDM) tool in an actual tank farm, with consideration of various operational, logistical, physical, political, safety, and other topics.

Technology Description
ERT is a leak detection technique in the family of methods that uses electricity and electrical properties. Tank contents vary but typically the liquids are highly saline and therefore electrically conductive. By introducing electrodes into the soil and measuring voltage changes that occur between electrodes surrounding a suspected leak location, information about the location, volume of the leak, direction, and rates of movement of the fluid can be determined.

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