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LNG Tanks are structures designed to store natural gas in a liquid state at atmospheric pressure. Depending on its chemical composition, the liquid state at atmospheric pressure is achieved by cooling the natural gas to a temperature below -160°C.

Flat bottom cylindrical tanks can be from simple containment to full containment tanks. The outermost is usually a concrete cylinder with a framework of cryogenic bars and pre-stressed with circular and vertical steel cables. The full containment tanks are typically made up of 4 containers.

Petroleum tanks used to store crude oil, aviation fuel, gasoline, diesel and other products above and below ground. Leaking tanks may create significant environmental damage and jeopardize safety. Soil and water contamination can be tremendous and be undetected for years.

Different methods have been developed and applied during the recent decades for non-destructive evaluation of metal and fiber-reinforced plastics (FRP) structures. Among these methods, acoustic emission technology is unique as it not only detects flaws but also is used for on-line, real-time monitoring of structural integrity without interruption of operation, cleaning, or product evacuation.