In a push towards further efficiency in LNG shipping, a newly developed LNG cargo containment system from French engineering firm GTT promises to further reduce cargo boil-off rates
An evolution of the NO96 cargo containment system (CCS), NO96 Super+ cargo containment technology has received an approval in principle (AiP) from class society Bureau Veritas.
While retaining the best features of NO96 technology, NO96 Super+ technology integrates insulating reinforced polyurethane foam panels instead of plywood boxes, used for both the primary and secondary insulation spaces, to reduce the heat ingress inside the tank. Glass wool flat joints are also inserted between adjacent foam panels to optimise the behaviour of the system and ensure it has the best thermal performance.
As in NO96, NO96 Super+ uses the principle of double Invar metallic membranes and the mechanical anchors fixing the insulating panels to the inner hull.
GTT anticipates NO96 Super+ offering a guaranteed boil-off rate (BOR) of 0.085%V/d for the current standard size design of LNG carrier of 174,000 m3 and 0.08%V/d with capacities of 200,000 m3.
The first mock-up using NO96 Super+ technology was erected in February 2021 and validated the satisfactory assembly of the CCS. Final class approval should be obtained by mid-2021, said GTT.
GTT chairman and chief executive Philippe Berterottière said, “Reducing the boil-off rate is key to the industry at a time when shipowners and shipyards face increasing economic and regulatory challenges.”
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