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Double Wall Tank

A storage tank that is essentially a tank within a tank, with a small space, or interstice, between the two.

If the inner tank should develop a leak, its contents would be retained by the outer tank. If the outer tank should develop a leak, groundwater would be prevented by the inner tank from contaminating the product inside. In addition, the existence of the interstice provides a method of continuously monitoring the integrity of each of the tanks.