Alex Cooperman, Plate Structure Engineer, and Yogesh Meher, Vice President, Global Engineering, CB&I, examine the different liner configurations available for the LNG market, and outline the issues and benfits for each one.
There is more than one means to contain liquid and vapour in an LNG tank. In fact, the industry has standardised several configurations, such as single containment and full containment. Secondary containment is always provided and serves as an additional layer of protection against potential leaks or spills, providing a safeguard in the event of primary liquid containment failure. The secondary containment is engineered to prevent the spread of LNG beyond the primary area, by installing either a barrier (such as a dike or berm) in a single containment system or, in a full containment system, an outer tank surrounding the inner tank, which can be designed to contain both product vapour in service and liquid in case of a primary container failure. Secondary containers in full containment LNG storage systems are typically made from pre-stressed concrete.
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