JOINING STRUCTURE OF CARGO CONTAINMENT SYSTEM FOR LIQUEFIED NATURAL GAS CARRIER

摘要

Disclosed is a joining structure of a cargo hold for a liquefied natural gas (LNG) carrier to join secondary barriers. The cargo hold for an LNG carrier according to the present invention comprises multiple primary barriers; primary insulation layers mounted on the rear surface of the multiple primary barriers; multiple secondary barriers mounted on the rear surface of the primary insulation layers; and secondary insulation layers mounted on the rear surface of the multiple secondary barriers. The joining structure according to the present invention comprises a metal joint strip arranged to cover the interface of the secondary barriers; an adhesive layer formed between the surface of the multiple secondary barriers and the rear surface of the metal joint strip to join the rear surface of the metal joint strip on the surface of the secondary barriers; and welding portions formed by welding the multiple secondary barriers and the metal joint strip. The adhesive layer is formed of a thermosetting polymer adhesive layer separated from the welding portions at a predetermined interval and a thermoplastic polymer adhesive layer formed between the welding portions and the thermosetting polymer adhesive layer. The present invention can prevent peeling and cracks by reducing tensile stress and peel stress since the metal joint strip joined to the boundary of the secondary barriers is joined by the adhesion of an adhesive and welding; thereby improving reliability. Also, the present invention can improve joining quality since the adhesive layer has a uniform thickness.