Product Description

Brand    Hebei Pot Group    Model    CFW-30/0.8

Material: Stainless Steel, Diameter: 2916mm

Application Range    -162℃    Volume    30000L

Heat exchange area - See drawing m², Ambient temperature - See drawing °C

Wall Thickness: 8/10mm, External Dimensions: 2916*8289mm

Origin: Shandong Heze

Horizontal LNG Storage Tank 30 Cubic LNG Storage Tank 60 Cubic LNG Storage Tank 100 Cubic Natural Gas Storage Tank

Low-temperature LNG storage tanks are double-walled structures, with the inner shell storing low-temperature natural gas liquid, withstanding the pressure and low temperatures of the medium. The inner shell is made of SS30408 material. The outer shell serves as a protective layer for the inner shell, maintaining a certain gap to form an insulating space. It bears the gravity loads of the inner shell and the medium, as well as the vacuum negative pressure of the insulation layer. The outer shell does not come into contact with the low temperature and is made of container steel. The insulating layer is mostly filled with mica sand, and high vacuum is drawn. The evaporation rate of low-temperature LNG storage tanks is generally less than 0.2%.

Low-Temperature LNG Storage Tank Structural Design

1.1 Liquid Filling System

The filling is divided into top filling and bottom filling, equipped with a quick connector CN-1 and a four-way connector, which are connected to the top filling valve V3 and the bottom filling valve V2 respectively. Tubes and transition joints are connected to the inner cylinder.

Tubes are selected in sizes φ28×2 and φ45×3.5.

1.2 Drainage System

Valve V6 is designed for direct drainage, with connection at the bottom of the cylinder; tubes are selected in φ45×3.5. V6 is equipped with 32gDA25C, with a specification of DN40PN4.0.

1.3 Vacuum Degree Measurement System

VR vacuum silicon tube, used to measure the vacuum degree of the tank's insulation layer, connected to the evacuation pipe of the insulation layer. When the vacuum degree of the vacuum layer exceeds 3Pa, the insulation layer should be re-evacuated to maintain the vacuum degree of the insulation layer and enhance the insulation effect.

1.4 Vacuum Insulation Panel System

VV vacuum vent, select CF-40 with DN 40, used for vacuum extraction. Close the VV when the vacuum level reaches the required standard, to maintain the interlayer vacuum.

1.5 Level Measurement System

Two pipelines are extracted from the upper and lower parts of the cylinder respectively, with the top being the vapor phase and the bottom the liquid phase, connected together by a level gauge valve. L1 Level Gauge Valve PS×Z-1, the gas line is connected to a pressure gauge valve and a pressure gauge, with the level gauge range being 0～6m water column.

1.6 Full Mouth Measurement

Install the pipeline based on the set liquid level. When the liquid level reaches the set value, it flows downward through the pipe to the level gauge MV. When filling, this valve opens until liquid starts to flow out, indicating the tank is full. Close the valve. Use a 32gDA10C valve, specification: DN20 PN4.0.

1.7 Self-pressurizing System

The pressure-increasing valve V1 is connected to the supercharger PBC-1, which uses the CFB03-00 model. It vaporizes a portion of the liquid flowing from the tank and introduces it into the inner tank, thereby increasing the pressure inside the tank and forcing the liquid out under pressure.

1.8 Gas Venting System

When the pressure at the top of the container increases, gas is released through the pipeline, passing through the vent valve E1, then to a check valve CV. Since gas can only flow outward, a check valve is used to prevent backflow. Therefore, a flame arrester is connected after the check valve because the gas, upon contacting air, may ignite. The flame arrester is designed to prevent sparks from entering the inner tank with the gas, which could cause a fire and explosion.

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