Thin film type containment system for LNG (liquefied natural gas) ship and mounting method thereof

The invention discloses an LNG ship thin film type containment system and an installation method thereof.The thin film type containment system comprises a plurality of liquid cargo tanks and bulkhead transition structures arranged between every two adjacent liquid cargo tanks, and liquid dome open holes are formed in the tops of the liquid cargo tanks; the bulkhead transition structure comprises a transition bulkhead used for separating cabins of the two adjacent liquid cargo tanks and transition assemblies arranged at the two ends of the transition bulkhead and fixed to outer plates of the cargo tanks, the transition bulkhead is a shared bulkhead of the two adjacent liquid cargo tanks, and piping systems in the two adjacent liquid cargo tanks are laid on the two side walls of the transition bulkhead respectively. According to the invention, the bulkhead transition structure is used for replacing a traditional isolation void cabin arranged between two liquid cargo tanks, so that the traditional isolation void