DELIVERING LNG TANKS MORE QUICKLY USING UNLINED CONCRETE FOR PRIMARY CONTAINMENT

摘要

The speed of delivery of an LNG terminal usually depends on the time to construct the tanks. This is most evident at import terminals. Traditional tank solutions must be built in a sequential manner with the secondary container being advanced to a considerable degree before the primary container can start in earnest. rnA tank solution that permits a significant overlap in the construction of the primary and secondary containers can be delivered more quickly. In this paper, the all-concrete tank concept previously proposed for offshore application has been further developed for onshore use with a schedule saving of up to eight months compared to traditional tanks. This schedule saving not only reduces time-related construction costs but, more importantly, produces earlier revenue. rnThe all-concrete tank dispenses with the carbon-steel liner previously adopted on primary concrete containers and replaces the carbon-steel liner usually provided on the secondary container with a non-metallic moisture barrier. These features, together with a waterproof base insulation system, permit rapid parallel construction in most weathers. A reduced reliance on specialist workers and materials makes the tank more attractive for use in developing countries. rnThe all-concrete tank has been subjected to a concept safety evaluation and the design basis has been reviewed and verified by a third party verification authority thereby making the solution more readily acceptable to operators and regulatory authorities