Cryogenic storage tanks are specialized pressure vessels engineered to store and transport liquefied gases at extremely low temperatures, typically below −150 °C (−238 °F). These gases, known as cryogens, include liquid nitrogen (LIN), liquid oxygen (LOX), liquid argon (LAR), LNG, liquid helium, and liquid hydrogen. Maintaining these products in liquid form requires precise control of temperature, pressure, and heat transfer.
These tanks operate based on the principles of cryogenics, the field that examines how materials behave at ultra-low temperatures. Because cryogenic conditions cause metal contraction, rapid evaporation, and sensitivity to heat, cryogenic tanks must be built with highly reliable insulation systems and structural designs.
Common Cryogens Stored in Cryogenic Tanks
Cryogenic tanks are used across industrial gas, medical, scientific, and energy sectors. Typical liquids stored include:
Liquid Nitrogen (LIN): Used for food freezing, electronics manufacturing, laboratories, and cooling applications.
Liquid Oxygen (LOX): Essential for medical use, steelmaking, combustion support, and aerospace systems.
Liquid Argon (LAR): Applied in welding, metal fabrication, and semiconductor manufacturing.
LNG: Used for energy storage, fuel systems, and LNG terminals.
Liquid Helium & Hydrogen: Required for research, MRI systems, space applications, and hydrogen energy technologies.
How Cryogenic Storage Tanks Are Built
Cryogenic tanks typically feature a double-wall design with a vacuum layer between the inner and outer vessels. This structure minimizes heat transfer and reduces product boil-off. These tanks maintain cryogens at the required temperature and pressure to ensure safe storage, reliable usage, and efficient transport.
Inner Tank
The inner vessel is constructed from high-grade stainless steel. This material provides excellent strength at cryogenic temperatures, resists brittle fracture, and ensures cleanliness for high-purity gases.
Outer Vessel (Vacuum Jacket)
The outer container is commonly made from carbon steel. Its primary function is to support the vacuum and insulation system. Under normal operating conditions, it does not come into contact with cryogenic temperatures.
Insulation System
The space between the inner and outer vessels is filled with insulating materials such as expanded perlite or multi-layer insulation. This area is then evacuated to create a high vacuum.
This insulation system minimizes heat intrusion caused by ambient air, barometric pressure changes, liquid fill displacement, and pump heat. Effective insulation is critical to reducing evaporation and maintaining stable operating pressure.
Insulation
The space between the inner tank and the outer container is filled with perlite, which can maintain cryogenic temperature and is subjected to high vacuum treatment. The vacuum and insulating material help reduce heat transfer, thereby reducing the boiling of liquid oxygen, liquid nitrogen, or liquid argon stored in the container.
The maximum working pressure of cryogenic liquefied gas storage tanks ranges from 2 to 37 bar, depending on where the tank will be used. It can be designed vertically or horizontally according to customer demand.
During the manufacturing phase of cryogenic tanks, the tests and inspections required by the standards are carried out by third-party organizations, and all tanks are certified and presented to our customers with CE and Pi marks.
Pressure Ratings and Tank Configurations
Cryogenic tanks are available in both vertical and horizontal designs. Typical working pressures range from 2 to 37 bar, depending on the gas and application.
Common categories include:
Microbulk Tanks: Small-volume tanks for medical, laboratory, and small industrial applications.
Bulk Tanks: Standard storage for industrial gas plants, hospitals, and processing facilities.
Cryogenic Transport Tanks: Designed for safe road transport of LIN, LOX, LAR, or LNG.
Flat-Bottom Tanks: Ultra-large tanks used at LNG terminals and air separation units.
Flat-Bottom Cryogenic Storage Tanks
Flat-bottom tanks are designed for long-term, high-capacity storage:
LIN, LOX, LAR: 500 to 15,000 m³
LNG, LPG, Liquid Ethylene: 1,000 to 30,000 m³
These tanks use a double-wall structure with high-performance insulation materials such as cellular glass, expanded perlite, and rock wool. Due to their size and importance, flat-bottom tanks must comply with strict international engineering and safety standards.
Design Standards and Certifications
Cryogenic storage tanks are manufactured and tested according to globally recognized engineering standards. Compliance ensures safe operation, structural integrity, and long service life.
Mechanical and Seismic Design Standards
API 620, API 650, ASME Boiler and Pressure Vessel Code, EN 14620, EN 14015, EUROCODE
Access and Safety Standards
EN ISO 14122-1/3, OSHA 1910.23/24
Additional Guidelines
EIGA and CGA standards for industrial gases
NFPA 59A for LNG facility design
During manufacturing, cryogenic tanks undergo detailed inspections by accredited third-party organizations. Certified tanks are provided with CE, Pi, and other regional compliance markings.
Cryogenic storage tanks play a vital role in safely storing and transporting liquefied gases at extremely low temperatures. Their double-wall construction, vacuum insulation, and adherence to global engineering standards ensure efficiency, safety, and long-term performance. Whether used for industrial gases, LNG infrastructure, medical systems, or scientific applications, cryogenic tanks are essential to modern energy and manufacturing industries.
No comment