The concept
The Mark III membrane system is a containment and insulation system, directly supported by the ship’s hull structure. It is composed of a primary corrugated stainless steel membrane, positioned on top of prefabricated insulation panels, including a complete secondary membrane made of composite material.
This modular system employs standard prefabricated components that can accommodate any shapes and capacities of tanks. They are designed for mass production techniques and easy assembly.
Mark III concept
Stainless steel primary membrane
Mark III evolution
GTT technologies are continually optimised to meet the requirements of ship-owners and shipyards, while also complying with regulatory changes affecting the sector.
Since 2008, GTT has introduced Mark III design evolutions to improve the thermal and structural efficiency of the technology.
Its latest development, Mark III Flex+, offers a guaranteed boil-off rate of 0.07% V/day, thanks to an insulation thickness increased of 480 mm.
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Mark III |
Mark III Flex |
Mark III Flex+ |
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Boil-off Rate (BOR)* (170K m3 vessel) |
From 0.15 to 0.125% |
From 0.10 to 0.085% |
0.07% |
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Date to market |
1969 (Mark I concept) |
2011 |
2017 |
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Insulation |
Foam 130 kg/m3 |
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Membranes |
Primary: Stainless steel 304L - 1.2 mm Secondary: composite material |
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Support |
Primary and secondary panel: foam and plywood |
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Thickness Primary + Secondary panel |
270 mm = 100 + 170 |
400 mm = 100 + 300 |
480 mm = 100 + 380 |
* BOR is project dependent due to vessel size, tank arrangement and reinforcements.
Mark III video
Mark III Flex video
