LNG ship, referred to as "LNG ship". Refers to the "ship" specialized in transporting liquefied natural gas. The earliest LNG carrier was 5 1958 "methane light duo", which was converted from an ordinary old American oil tanker.
According to the structure of cargo oil tank, it can be divided into independent storage tank type and membrane type. The former is to place cylindrical, pot-shaped and spherical storage tanks on the ship; The latter adopts double-shell structure, and the inner shell is the bearing shell of the cargo hold. Compared with independent type, membrane type has the advantages of high volume utilization rate and light structure weight.
Therefore, newly-built LNG ships, especially large LNG ships, mostly adopt membrane structure. LNG carrier has complex equipment, high technical requirements and high cost.
LNG carrier, referred to as LNG carrier for short, mainly transports LNG. The main component of liquefied natural gas is methane. In order to facilitate transportation, it is usually frozen and liquefied at very low temperature (-165℃) at normal temperature and pressure.
China is not only a country that independently develops a series of LNG ship types after South Korea and Japan, but also has obvious advantages in safety, energy saving and environmental protection.
The tank requires a strict thermal insulation structure to ensure the continuous low temperature of the tank. There are two common cabin shapes: spherical and rectangular, but a few ships design the cabin shape as diamond or cylindrical.