What is LNG carrier

(Summary description)Isometric LNG ship, referred to as “LNG ship” for short. Refers to a “ship” that specializes in transporting liquefied natural gas. The earliest LNG ship was the 5,100-square-meter “Methane Light Duo” built in the United States in 1958 using ordinary old oil tankers. According to the structure of the cargo tank, it can be divided into independent storage tank type and membrane type. The former is to put cylindrical, tank, spherical and other storage tanks in the ship; the latter adopts a double shell structure, the inner shell is the load-bearing shell of the cargo tank. Compared with the independent type, the membrane type has the advantage of high volume utilization The structure is light in weight, so newly built LNG ships, especially large ones, mostly adopt membrane structure. Liquefied natural gas ships have complex equipment, high technical requirements and high cost.

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Time of issue:2020-05-08 10:53
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　　Isometric LNG ship, referred to as “LNG ship” for short. Refers to a “ship” that specializes in transporting liquefied natural gas. The earliest LNG ship was the 5,100-square-meter “Methane Light Duo” built in the United States in 1958 using ordinary old oil tankers. According to the structure of the cargo tank, it can be divided into independent storage tank type and membrane type. The former is to put cylindrical, tank, spherical and other storage tanks in the ship; the latter adopts a double shell structure, the inner shell is the load-bearing shell of the cargo tank. Compared with the independent type, the membrane type has the advantage of high volume utilization The structure is light in weight, so newly built LNG ships, especially large ones, mostly adopt membrane structure. Liquefied natural gas ships have complex equipment, high technical requirements and high cost.

　　The main component of liquefied natural gas is methane. To facilitate transportation, it is usually liquefied by freezing at a very low temperature （-165 ° C） under normal pressure. China is not only a country that has achieved independent research and development of a series of LNG ship types after Korea, Japan, and other countries, but China 's design ship types have obvious advantages in safety, energy saving, and environmental protection. LNG ships are transported and liquefied at 162 degrees Celsius （-162） The gas-powered special vessel is a kind of “sea super-refrigerated vehicle”, which is hailed as the “pearl of the crown” of shipbuilding in the world. Only 13 shipyards in the United States, China, Japan, South Korea and a few countries in Europe can build.

　　LNG ship storage tank is a special structure independent of the hull. In the design of the ship, the main factors considered are materials that can adapt to low-temperature media and the treatment of volatile or flammable materials. Ship size is usually limited by the conditions of the port terminal and receiving station. 125,000 cubic meters is the most commonly used size, the largest size in the construction of ships has reached 200,000 cubic meters. The service life of LNG ships is generally 40 to 45 years.

　　From the birth of this ship type to 2013, the world's LNG tank storage systems are mainly self-supporting and membrane type. There are two types of self-supporting type, A type and B type. A type is rhombic or IHISPB, and B type is spherical.

　　LNG receiving terminal has a dedicated terminal for berthing and unloading of LNG carriers. The storage tank is used to contain LNG unloaded from LNG carriers. The regasification unit heats the liquefied natural gas to make it into a gas, and then transports it to the end user via pipeline. The cold energy released by LNG during the regasification process can be used comprehensively. Generally speaking, about 25% of the cold energy can be used.

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