LNG carrier cargo containment system

What are the main differences between GTT No96 and Mark III LNG Membrane Tank systems? What are the benefits and drawbacks, and the BOG response of each system?


Membrane Cargo Containment systems are separated in 2 spaces called Insulation Spaces. The barriers (Primary and Secondary) separate those Spaces from the cargo and between them respectively.

-No.96 Both barriers are made from 36% Nickell-alloy steel of 0.7mm thickness (aka Invar), which rest on top of Plywood boxes filled with PU foam (insulation). Total thickness is 530m. BOG is 0.15%

-Mark 3 Flex: Primary barrier consists of a 1.2mm 304L SUS corrugated membrane, while
Secondary is an aluminium sheet bonded with glass wool on both sides (consists of Rigid(integrated with Panels) and Flexible(applied during construction)). Insulating Material are PU foam-Plywood bordering boxes (Panels). Total thickness is 400mm and BOG is 0.1-0.085%. Mark 3 Flex+ BOG is 0.065%, but with increased thickness of 480mm.


Thank you for your input!

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