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GTT gains second AiP for cubic LNG fuel tank
Approval in principle backs a cubic LNG fuel tank concept, with design-pressure verification that targets easier engineering, faster installation and improved volume efficiency
Classification society Lloyd’s Register has granted approval in principle (AiP) for a cubic LNG fuel tank design intended for use on LNG-fuelled vessels, with the approval also covering operation at a design pressure of 1 barg.
The AiP was issued by Lloyd’s Register for GTT’s CUBIQ LNG fuel containment system.
GTT described the concept as a near-cubic geometry that removes the upper and lower chambers used in traditional LNG containment systems, with the stated intention of standardising engineering and simplifying construction.
Lloyd’s Register said its role in the AiP was to provide early-stage assurance that the design is supported by appropriate risk assessment through construction and operation.
Lloyd’s Register global gas segment director Constantinos Chaelis said, “As the use of LNG as fuel grows at a considerable pace, expanding beyond gas carriers, it is critical that novel containment designs are assessed against robust rule requirements.”
He added, “This approval in principle supports the safe development of an innovative containment system that can be applied across a wider range of ship types.”
GTT chief executive François Michel said, “The AiP from Lloyd’s Register is a strong endorsement of our GTT CUBIQ technology and confirms the robustness of its design.”
He added, “This innovation responds directly to shipyards and shipowners’ expectations by simplifying the integration of membrane containment systems for LNG tanks, optimising space on the vessels, and thereby supporting the growing adoption of LNG as a marine fuel.”
The AiP was presented at GTT’s stand during the LNG2026 conference in Doha last week.
During Gastech in Milan in September 2025, GTT received an AiP for the concept from Bureau Veritas Marine & Offshore.
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