LR’S NEW LNG CARRIER GUIDELINES

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UK-based class society Lloyd’s Register has published a set of comprehensive guidelines to help owners, operators and builders of membrane-type LNG tankers to assess the ability of a containment system to withstand sloshing loads.

The guidelines, “Comparative Sloshing Analysis Of LNG Ship Containment Systems”, provide a means of fulfilling the requirement to take sloshing into account during containment system design in Lloyd’s Register’s Rules and Regulations for the Construction and Classification of Ships for the Carriage of Liquefied Gases in Bulk. In addition, owners and operators now have a robust method for examining site-specific and voyage-specific partial filling of membrane cargo tanks in both ships and offshore floating structures.

The guidelines adopt a ‘comparative’ approach which involves comparing a proposed design with one for an LNG tanker of 135,000 to 140,000 cu m with conventional tank shape and size to ascertain the ability of the containment system to withstand the sloshing loads it is likely to experience based on the proposed trading pattern of the vessel

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