ABS TECHNICAL PAPERS 2008 Structural Integrity Assessment of Cargo Containment Systems in Arctic LNG Carriers under Ice Loads
and reprinted with the kind permission of the organizers of Arctic Shipping 2008 There has been an increased interest in shipping in ice-covered waters such as the Arctic Ocean due to the efforts in recovering the large deposits of gas and oil in these areas. This circumstance leads to many technica...
| Main Authors: | , , , , , , , , |
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| Format: | Text |
| Language: | English |
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| Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.434.7822 http://www.eagle.org/eagleExternalPortalWEB/ShowProperty/BEA Repository/References/Technical Papers/2008/StructuralIntegrityAssessment/ |
| Summary: | and reprinted with the kind permission of the organizers of Arctic Shipping 2008 There has been an increased interest in shipping in ice-covered waters such as the Arctic Ocean due to the efforts in recovering the large deposits of gas and oil in these areas. This circumstance leads to many technical issues related to the structural strength of liquefied natural gas (LNG) carriers subject to intensive ice loads. The hull structures of both the membrane tank type and the spherical tank type LNG ships have to be designed by Polar Class Rules. However, the Rules are not available for cargo containment systems (CCS) in LNG ships under ice impact loads. In this paper, ship and ice interaction scenarios have been investigated in possible operation routes for the finite element (FE) analysis. Also, simplified ice load models have been developed. For the membrane tank type LNG carrier, finite element models have been developed to include not only hull structure but also cargo containment systems (CCS) at the midbody and shoulder areas for analyses. For the spherical tank type LNG carrier, finite element models including the hull structure and skirt structure at the midbody and shoulder areas have also been developed. In FE simulations, linear buckling analyses have been performed to determine the critical buckling load for ensuring the stability of hull structure. Nonlinear static FE analyses have been conducted to compute the response of the cargo containment system. Based on FE results and assessment criteria, the strength of the cargo containment systems in LNG carriers has been evaluated. Finally, structure analysis procedures have been developed for assessing the strength of LNG cargo containment systems under ice loads. 1 |
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