The Neptune system allows unmanned entry and sensor data collection in above-ground storage tanks (ASTs). The sensors are immersed in the petroleum product and uses video and ultrasonics to ascertain from the inside-out the state of corrosion of the floor and side-walls. This eliminates the need to empty or clean the tanks and also avoids the required human walk-through inspection, which results in a very sparse data set from which the tank's state must be statistically extrapolated.
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