GTT NEXT1 technology is a cryogenic containment used to contain liquefied gases at low temperature, at atmospheric pressure.

It is the latest evolution under GTT’s program of continuous optimisation to meet the requirements of ship-owners and shipyards, and to reduce the daily boil-off rate of the technology to 0.07%V/d.

This evolution is an important step in GTT’s Cargo Containment Systems (CCS) development program: the whole insulating components are updated to use Polyurethane (PU) foam at primary and secondary levels.

Most importantly, the anchoring elements of the CCS are also optimised in order to further increase the thermal performance of the insulation.

The concept

The GTT NEXT1 membrane system is made up of a fully redundant membrane and insulating system, directly supported by the ship’s inner hull. It includes two independent metallic membranes, both supported by a layer of insulating material.

The primary barrier, directly in contact with the cargo, is a corrugated stainless steel membrane, adapted from GTT’s Mark technologies, whereas the secondary barrier, achieving full redundancy of the tightness function, is a Fe-36%Ni alloy membrane.