LNG Membrane Containment Systems of the design, generally fall into two categories that were originally designed by the two separate companies, GAZ Transport (GTT) and Technigaz. Both are similar in that they comprise of primary membrane barrier, insulation, secondary membrane barrier and further insulation in a sandwich construction. The membrane may be Invar (Gaz Transport) or stainless steel (Technigaz) – the Northwest Swan is of the GTT NO96 design with Invar primary and secondary barriers. The membranes in the NO96 design are 0.7mm thick, each layer of insulation is about 300mm thick. The tanks are not self supporting as in the Moss design, they are built against the inner (double) hull of the vessel. Nitrogen is purged through the insulation layers and a gas detection system is installed. (Source: www.nwsssc.com/)
Related Definitions in the Project: The Plant and Process Unit
