Sealing system of A-type storage tank and installation method of secondary barrier thereof

Abstract

The invention discloses a sealing system of an A-shaped storage tank and an installation method of a secondary barrier thereof. The sealing system comprises the A-shaped storage tank, shells are arranged outside the A-shaped storage tank and are of a sheet structure, and the shells are vertically arranged at intervals and are fixedly connected with the A-shaped storage tank in a welding mode; a plurality of groups of oil tank air pockets are arranged on the upper surface of the A-shaped storage tank and communicate with the interior of the A-shaped storage tank, main barriers are arranged in the A-shaped storage tank and are formed by welding common metal plates, and cavities for storing liquefied natural gas are formed among the main barriers in a welding manner. The storage tank is A-shaped, so that the structural stability of the storage tank is more stable than that of a traditional storage tank; meanwhile, the main barriers are arranged in the storage tank to form the main barrierstorage unit, and the secondary barriers are arranged outside the main barriers to form a secondary barrier unit which covers the outside of the the main barrier unit, so that a protection structureis formed outside the main barrier unit again, increasing the safety of the storage tank.

Description

technical field [0001] The invention relates to the technical field of ships, and more specifically relates to a sealing system of an A-type storage tank and a method for installing a secondary barrier thereof. Background technique [0002] Liquefied natural gas carrier, referred to as "LNG carrier". Refers to a "ship" dedicated to the transportation of liquefied natural gas. The earliest LNG carrier was the 5,100-square-meter "Methane Guangduo" rebuilt from an ordinary old oil tanker in the United States in 1958. According to the structure of the liquid cargo tank, it can be divided into independent storage tank type and membrane type. The former is to place cylindrical, tank-shaped, spherical and other storage tanks in the ship; the latter adopts a double-hull structure, and the inner shell is the load-bearing shell of the liquid cargo tank. Compared with the independent type, the membrane type has the advantage of high volume utilization , the structure is light in wei...

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Problems solved by technology

[0003] At present, the existing LNG ships need to use storage tanks to store natural gas, but the structural stability of the storage tanks is insufficient, and the sealing system inside the storage tanks often adopts a single-layer sealing structure, and the storage tanks are prone to rupture and cause liquid natural gas. leak of

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