ClassNK has released its Guidelines for Liquefied Gas Carrier Structures – Independent Prismatic Tanks. The Guidelines specify the technical requirements specifically related to the structural strength assessments of liquefied gas carriers by using direct calculation.
There are two components of the Guidelines that specify the design loads dominant for structure, strength analysis methods and corrosion deductions, and the design scenarios in which assessments are required by the IMO IGC Code. The components are for Direct Strength Analysis and the Fatigue Strength Assessment.
The Guidelines for Direct Strength Analysis specify yield strength and buckling strength by direct strength analysis using the net scantling of primary structural members as well as previously released ClassNK Guidelines for the structures of other ship types.
The Guidelines also feature specific requirements for assessment methods taking into account the complex interaction of loads between hull structures and cargo tanks independent from the hull structures. They target independent cargo tank structures and their support structures as well as hull structures.
The guidelines are available to download free of charge via ClassNK’s website www.classnk.com for those who have registered for the ClassNK “My Page” service.