The Guidelines define the technical criteria for structural strength assessment using finite element analysis when designing liquefied gas membrane-type carriers, ClassNK noted in its release.

As with the Society's other structural strength assessment guidelines, they are based on the long-standing expertise of ClassNK and outline the criteria to be considered for membrane-type liquefied gas carrier structural strength along with relevant rules to help efficient designs.

The Guidelines are composed of the Guidelines for Direct Strength Analysis which specify the requirements for the assessment by direct strength measurement of the yield and buckling strength of the net scantlings of the primary structural members and the Guidelines for Fatigue Strength Assessment which describe the requirements for stress-concentrated parts for fatigue strength assessment.

The key components include hull structure dominant design loads, methods of strength analysis and corrosion deductions, design scenarios in which tests are needed by the IMO IGC Code, local strength specifications for internal hull structures, and requirements for strain management for internal hull structures required by membrane cargo containment system designers.

In the "PrimeShip-Hull" series, a calculation feature corresponding to the specifications of the guidelines will also be added.

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