モス方式LNG船の船体及び球形タンク強度に関する模型試験

概要

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MRV (Moss-Rosenberg Verft) type LNGC has following special structural features comparing with other conventional cargo ship. 1) Spherical cargo tanks are supported by cylindrical structures called "Skirt" at their equator zone, and Skirts are welded to hull structure, called "Foundation Deck". 2) There are large openings at their Upper Deck because the centers of cargo tanks are near the Upper Deck level. 3) In order to keep the gas tightness of holds and to protect tank systems, huge tank covers are provided. Model experiments are carried out using 4.2m length "Hull Model" and 3.3m dia. "Tank Model", to verify the validity of the methods of strength analysis considering the above structural characteristics. Major conclusions are as follows. 1) Torsional deformations of openings at Upper Deck are reduced to about 1/3 by the effect of tank covers and tank systems. 2) Tank covers reduce the longitudinal bending stress at Upper Deck by about 15%. 3) Stresses of tank systems can be accurately estimated by axisymmetrical FEM program.
社団法人日本船舶海洋工学会の論文
1982-03-03