The vertical vacuum-insulated LNG storage tank is a double-walled vacuum powder insulated cryogenic pressure vessel designed in accordance with GB/T 18442, GB150, TSG21 and GB51261. As the core storage equipment downstream of natural gas liquefaction units, it provides low-temperature buffer storage for liquefied LNG. Equipped with a BOG recovery system, it enables closed loading and export. It is widely used in small and medium-sized LNG liquefaction plants and satellite liquefaction stations.
The tank adopts a proven double-wall construction. The inner vessel is made of S30408 austenitic stainless steel to meet the cryogenic toughness requirement at -162 °C. The outer shell is fabricated from Q345R pressure vessel steel plate. The annulus space is filled with perlite and special adsorbents to maintain high vacuum insulation and achieve low evaporation loss. Cold bridge insulation pads are installed on the skirt to block cold conduction and prevent frost heave damage to the foundation.
Core Features
✅ Fully prefabricated in factory, deliverable by complete vehicle, short on-site installation period
✅ Volume range: 5~250 m³; standard sizes 50/60/80/100/150 m³, customisation available
✅ Optional design pressures: 1.0 MPaG, 1.6 MPaG, suitable for pressurised storage service in liquefaction plants
✅ Fitted with SIS safety interlock system, two independent level and pressure transmitters; high-high level / high-high pressure interlock for feed shutdown
✅ BOG vapour is preferentially recycled to the BOG compressor for re-liquefaction; automatic switchover to flare venting under fault conditions to minimise emissions
✅ Dual safety relief valve assembly, annulus pressure monitoring and negative-pressure nitrogen make-up protection to avoid inner vessel collapse
✅ Compatible with closed loading process, matched with cryogenic LNG loading arm for liquid loading and vapour return
✅ Industrial white matt finish on tank exterior, weather-resistant and anti-corrosive with clear marking
Material Specification
Inner Vessel: S30408 (06Cr19Ni10) austenitic stainless steel
Outer Shell: Q345R pressure vessel steel plate
Insulation: Perlite high-vacuum insulation
Support Skirt: Q345R with cold bridge insulation pads
Safety Arrangements
Dual safety relief valves, annulus venting device, vacuum monitoring, cryogenic pneumatic emergency shut-off valves, SIS interlock for level and pressure, anti-static and lightning protection design, bunding protection provisions.
Applications
Buffer storage of finished product at natural gas liquefaction plants, closed loading for LNG tankers, satellite liquefaction stations and LNG peak shaving stations.
