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Milestone Study Advances LNG Carrier Structural Design in Arctic Conditions A joint development project conducted by ABS, BMT Fleet Technology and Hyundai Heavy Industries (HHI) investigating the structural integrity of cargo containment systems under different ice impact scenarios has just been completed leading to recommendations and guidance for these containment systems operating in ice conditions.
The study’s completion is timely as many LNG carriers will be required in the coming years to transport gas from Arctic regions of Russia which some industry analysts estimate holds approximately one-third of the world’s vast oil and gas reserves.
With no ice-breaking LNG carrier in-service history, the study becomes a milestone in advancing Arctic LNG transport.
The four phase study identified and generated severe ice loads for structural analysis, performed finite element (FE) analysis on the local model of hull structure and containment system under ice loads as well as developed an ice load model taking into account interaction between hull and ice, quasi-static loads and time varying dynamic loads, and investigated failure modes with development of cargo containment acceptance criteria.
“We specifically wanted to check the containment system and hull structure simultaneously responding to ice impact loads,” said Roger Basu, Director, ABS Corporate Research & Development.
He further explained that a hazard identification or HAZID analysis was conducted to define hull critical ice impact load cases for a 150,000m3 carrier. Six impact scenarios or critical cases were analyzed in the study. They were: bow glancing in thick multi-year ice; shoulder glancing in thick multi-year ice; shoulder reflected in thick multi-year ice; shoulder wedging in thick multi-year ice; mid- body glancing in thin multi-year ice and mid-body pressure in thick multi-year ice.
“From the study we have an improved understanding of the cargo containment system under ice loads,” he added. “This will lead to guidance for designers of LNG carriers and other large ships operating in ice.”
Founded in 1862, ABS is a leading international classification society devoted to promoting the security of life, property and the marine environment through the development and verification of standards for the design, construction and operational maintenance of marine-related facilities.
Editor’s Note: This news release is based upon a presentation given on April 9 by J.C. Kwon of HHI at the Fourth Annual Arctic Shipping 2008 Conference & Seminar, St. Petersburg, Russia titled “Structural Integrity Assessment of Cargo Containment System for Arctic LNG Carriers Under Ice Loads” (Roger Basu, ABS, Andrew Kendrick, BMT Fleet Technology and J.C. Kwon, HHI). For a copy of the presentation email: CorporateCommunications@eagle.org | | | 来源:ABS |
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发表于 2008-4-10 12:04
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