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2017-07-20 17:35:23
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Header Mark V

Mark V system

The Mark V membrane system is a cryogenic liner directly supported by the ship’s inner hull. This liner is composed of both metallic membranes (primary and secondary) combined with both insulation prefabricated panels.
The new system includes an innovative 36% nickel-iron alloy corrugated secondary mem­brane and offers significant improvement of the warranted daily boil-off rate (down to as low as 0,07% V/day).
This cargo containment system is adapted to all sizes of LNG carriers.

GENERAL DESCRIPTION

PRIMARY STAINLESS STEEL MEMBRANE

The primary membrane is identical to the Mark III primary membrane and made of corrugated stainless steel 304 L, 1.2mm thick. It contains the LNG cargo and is directly supported by and fixed to the insulation system.

SECONDARY INVAR MEMBRANE

The secondary membrane is made of corrugated 36% Ni-Fe, 0.7mm thick. It ensures a total liquid and gas tightness in case of damage of the primary membrane. It is positioned on the secondary insula­tion panels with corrugations oriented to the hull.

INSULATION

The insulation consists of both load-bearing systems (primary and secondary insulation panels) made of prefabricated panels in reinforced polyurethane foam. The secondary panels are fixed to the inner hull by means of resin ropes which serve a double purpose: anchoring the insulation and spreading evenly the loads. The primary panels are linked to the secondary panels with mechanical anchoring systems.

Mark V

INDUSTRIALIZATION

GTT has signed cooperation agreements with Samsung Heavy Industries and Hyundai Heavy Industries shipyards for the development and qualification of industrialization processes, such as welding robots and adaptation of specific tools. The shipyards have also built mock-ups dedicated to final developments and related tests.

COMPETITIVE ADVANTAGES

ZERO STRESS CONCEPT

The orthogonal corrugation pattern enables both membranes (primary and secondary membranes) to accommodate any thermal or hull deflection stresses and to work under the fatigue limit, therefore providing outstanding lifetime.

NEGLIGEABLE EDGE LOADS

Because of low stress on both membranes, prefabricated foam corner panels can be used to anchor both membranes to the hull, therefore minimizing thermal flux.

HIGH RESISTANCE

Reinforced polyurethane foam gives high mechani­cal properties to the panels. The high density of the foam and the plywood covering both sides of the panels - for an even load distribution - allow the insulation to withstand high impact pressures and absorb the energy resulting from liquid motion.

MODULAR CONCEPT

This modular system calls for standard prefabricated components that can accommodate any shape and capacity of tanks and are designed for mass produc­tion techniques and easy assembly.

SAFETY

The two independent insulation spaces are con­tinuously flushed with nitrogen gas. The integrity of both membranes is permanently monitored by detection of hydrocarbon in the nitrogen.

LOW BOIL-OFF RATE

Boil-off rate is reduced by increasing the insula­tion thickness (up to 480mm) of Mark V and using efficient R-PUF compared with current membrane systems (down to 0,07% V/day).

RELIABILITY

All materials used in Mark V are sea-proven in GTT’s technologies. Mark V has been granted General Ap­proval by major classification societies.

 

Mark V system - Video