With the development of the LNG industry, LNG storage is becoming larger and more atmospheric. The domestic design and manufacture has reached 50,000 m³. A single atmospheric storage tank of 250,000 m³ and 160,000 m³ LNG has been established along the coast to receive ship-borne LNG. .
At present, LNG storage tanks designed, manufactured and installed in China are mainly 5000m³ and 10000m³, which are widely used in LNG liquefaction plants or LNG peak shaving stations.
Main structure type
Vertical, cylindrical, bimetal, inner ceiling, outer vault, high thermal angle protection
The interlayer adopts pearl sand, elastic felt, foam glass brick to keep cold
Process system
01. Purge system
02. Liquid inlet system
03. Drainage system (external and submersible)
04. Backflow system after pump
05. Sandwich nitrogen supply system
06. Liquid level and pressure measuring system
07. Temperature measurement system
08. Gas exhaust system
09.BOG pipeline system
10. Analysis and sampling system
11. Security system
12. Voltage stabilizing system
13. Fire fighting system
LNG storage tank design, manufacturing and acceptance standards
1. European standard BSEN14620 "Design and on-site manufacturing of vertical, cylindrical, and flat-bottomed cooling liquid storage tanks with an operating temperature of 0ºC~-165ºC"
2. JB/T9077-1999 "Powder Ordinary Thermal Insulation Storage Tank"
3. JB/T4735-1997 "Steel Welded Atmospheric Pressure Vessel"
4. American Standard API620 "Design and Construction of Large Welded Low Pressure Storage Tanks"
5. JB/T4730-2005 "Non-destructive testing of pumping equipment"
6. GB50128-2005 "Code for Construction and Acceptance of Vertical Cylindrical Steel Welded Storage Tanks"
7. GB/T20368-2006 "Liquefied Natural Gas (LNG) Production, Storage and Transportation"
The LNG receiving station is an organic whole composed of many related equipment assemblies. Through the cooperation of these equipment, the LNG transported by sea can be stored in the LNG storage tank through a certain process and transported to the user. These equipments include unloading arms, storage tanks, low-pressure transfer pumps, high-pressure transfer pumps, vaporizers, BOG compressors, flare towers, etc.
Unloading arm
The role of the unloading arm, as the name suggests, is to transfer LNG from the marine carrier to the storage tank through the corresponding pipeline. It is the first step for the LNG receiving station to receive LNG. The difficulty that needs to be overcome is low temperature preservation and omnidirectional rotation without leakage. In addition to the unloading arm, the receiving station should also be equipped with a gas-phase return arm to prevent the danger of negative pressure in the tank during unloading.
Low pressure transfer pump
Its function is to extract LNG from the storage tank and send it to the downstream device, which is an important equipment in the transportation system.
High pressure transfer pump
The function is to directly enter the LNG from the recondenser into the LNG high-pressure transfer pump, and then transfer it to the vaporizer after being pressurized.
Vaporizer
Its function is to vaporize liquid natural gas into gaseous natural gas, and send it into the gas pipeline network after pressure adjustment, odorization, and measurement. Generally, seawater is used as the vaporization medium.
BOG compressor
It is used for pressurization and gas transportation, that is, a part of the boil-off gas generated in the storage tank is boosted by the compressor and enters the recondenser for condensation, and then is sent to the vaporizer together with the exported LNG through a high-pressure export pump.
Torch Tower
The function of the flare tower is to burn the exhaust gas and adjust the pressure in the tank at the same time.
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