French LNG containment specialist GTT has received the final approval for its upgraded containment system technology from the classification societies Bureau Veritas, DNV and Lloyd’s Register.
The upgraded NO96 Super+ technology keeps the main features of the NO96 containment system. These are in particular the double invar metallic membranes and the mechanical anchors fixing the insulation panels to the hull.
GTT says the new technology offers a reduced boil off rate. The heat ingress inside the tank is reduced by integrated insulating reinforced polyurethane foam (R-PUF) panels instead of plywood boxes. Thermal performance is additionally improved by the addition of glass wool joints, inserted between adjacent foam panels.
With this, GTT provides a solution to reduce the evaporation of the cargo.
NO96 Super+ is reportedly guaranteeing ship-owners a daily boil off rate (BOR) of 0.085 per cent of volume for the current standard size design of 174,000 cubic metres LNG carrier.
Philippe Berterottière , chairman and CEO of GTT, said: “Reducing boil off rate is essential for the industry as ship-owners and shipyards face ever-increasing economic and environmental challenges.”