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Vault installation is one of the important parts of the LNG storage tank construction. Due to the large size, installation of high accuracy and the influence affected by complex factors such as wind load in hoisting process, the installation procedure is always controlled by artificial way which is low efficiency and a big risk. In this paper installation process is optimized. According to the structural characteristics of vault plate, this paper proposes a new kind of installation guide equipment and analyses the process of guiding, which can help vault plate realizing itself position. The equipment can greatly improve the installation accuracy and working efficiency, and also can reduce the risk of installation. The technology of vault plate installation of LNG storage tank has important practical value and significance.

Liquefied natural gas (LNG) is obtained by cooling the gas temperature to -162 degree. Problems with the steel cans, the insulation layer or the concrete tank of the LNG tank can lead to changes of the temperature, local temperature decreases, and the safety of the tank is threatening. Through the combination of many sets of infrared thermal imager to monitor the temperature of the LNG storage tank’s sidewall, analyze the heat imagine, establish the corresponding relationship between the locations on the sidewall of the LNG tank and on the heat imagine, determine the position of the temperature point on the tank wall. Infrared thermal imaging technique for the sidewall of LNG storage tank can find out the heat abnormal conditions and fixing the temperature drop area in time, and provide powerful guarantee for the safe storage of the liquefied natural gas.

Due to LNG liquid density is uneven, traditional LNG tank bottom discharge way produces layering and rolling phenomenon, in this paper, the way of charging LNG liquid in a circle is put forward. 30,000 square tank is taken as an example, the nozzle jet angle and nozzle number range are calculated. Through the selection of reasonable nozzle jet angle and nozzle number, the new charged LNG liquid flows circularly and mixes with original liquid automatically, the probability of layering and rolling phenomenon reduced greatly.

LNG gains popularity as a kind of clean and efficient energy, LNG tank dome air raising installation technology is a key problem for tank construction, chain preloaded is adopted in traditional balance guidance device, the wire rope tension cant maintain a constant in air raising, which brings great safety hidden trouble. In this paper, the tension control technology based on closed-loop was put forward, the tension control device was designed and the hydraulic system principle was designed. Tensioning force can be adjusted automatically in the air raising process by researching on LNG dome air raising technology based on closed-loop tension control. It is of great significance for improving the efficiency and safety in the process of air raising .