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Hyundai Heavy Industries (HHI) has developed a high performance Hyundai Membrane LNG Cargo Containment System.
This new membrane type containment system for liquefied natural gas received design approval from classification societies including Det Norske Veritas (DNV).
HHI says the containment system which is useable for LNG carriers, LNG FPSO, LNG fuelled vessel, and LNG bunkering systems, features dual metal barrier and high performance insulation systems. The thin STS304L and invar-alloy barriers optimised to sustain thermal, fatigue, and sloshing loads, are specifically designed to prevent LNG leakage at the welded secondary barrier. It claims that the new insulation panels with low density polyurethane foam and glass fibre composite material reduce boil off rate by more than 10% of the stored liquefied natural gas in comparison with conventional insulation panels. The insulation panels made up of reinforced polyurethane foam and plywood are specially designed for areas prone to sloshing damage such as LNG tank corners.
The company claim that this technology meets the International Maritime Organization standards requiring high levels of structural analysis, fatigue analysis, comparative wet/dry drop test, and fluid-structural interaction analysis for membrane type LNG cargo containment system.
In November 2012, the Ulsan, South Korea-based company introduced an independent liquefied natural gas storage tank model, Lobe-Bundle Tank. This model uses ring-shaped plates instead of conventional flat plates to reduce the weight of the tank and building cost, and spray-type insulation to substantially reduce construction time.
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