In industrial production, medical research, new energy storage, food processing and many other fields, cryogenic storage tanks are the core specialized equipment for storing industrial cryogenic gases such as liquid nitrogen, liquid oxygen, liquid argon and liquid hydrogen. Many enterprises in the equipment procurement stage, improper selection will lead to a series of operational problems, such as gas evaporation rate is too high, frequent replenishment to increase costs, pressure mismatch leads to unstable gas supply, equipment compliance does not meet the standards can not be accepted, and even cryogenic leakage, overpressure and other security risks.
This article combines the cryogenic and industrial gases industry general design standards and engineering practical experience, to organize a set of systematic, land-based cryogenic storage tank selection method. Reduce the full life cycle costs, to ensure the long-term safe and stable operation of the equipment.
Cryogenic storage tank is designed for ultra-low-temperature liquid gas design of double-layer vacuum adiabatic pressure vessel, routinely adapted to the storage temperature below -150 ℃ cryogenic liquefied gases. Different from ordinary atmospheric tanks and high-pressure gas cylinders, its core advantage is the vacuum insulation structure to maximize the transmission of external heat into the tank.
This special structure can greatly reduce the natural evaporation loss of cryogenic liquid and avoid the rapid gasification and leakage of cryogenic gas. At the same time, the equipment is equipped with perfect pressure control and safety protection devices, which can store all kinds of high-purity industrial cryogenic media in a long-term, safe and stable manner.
Conventional cryogenic storage tanks using a double-layer structure design, the inner tank is made of low-temperature resistant, high toughness stainless steel or aluminum alloy, specializing in carrying cryogenic liquids, to eliminate the risk of cryogenic brittle cracking. The outer shell is mostly made of carbon steel or stainless steel, which plays the role of protection, load bearing and resistance to external damage.
Between the inner and outer layers is a vacuum sandwich, can be matched with pearl sand, multi-layer insulation materials, molecular sieve and other auxiliary thermal insulation materials, to further reduce the heat conduction efficiency. At the same time, the cryogenic tank is equipped with pressure relief valves, rupture discs, vaporizers and other safety components to accurately control the pressure inside the tank and avoid the risk of overpressure.
Not all industrial gases require cryogenic tank storage. High pressure cylinders at room temperature can store gases such as propane, acetylene, etc., while high purity gases with extremely low boiling points and suitable for large-scale storage and transportation must be stored in liquid form in cryogenic tanks in order to reduce the volume of stored gases, storage and transportation pressure and costs.
One liter of liquid nitrogen can be converted into about 700 liters of room temperature gaseous nitrogen after gasification, with a very high volume compression ratio, which is also the core reason for giving priority to cryogenic liquid storage for large-scale industrial gas supply.
Mainstream industrial gases suitable for cryogenic storage tanks:
Liquid nitrogen (LN₂, -196℃): the most widely used, suitable for industrial inert protection, food freezing, biological cryopreservation, electronic process cooling and other scenarios.
Liquid oxygen (LOX, -183 ℃): mostly used in medical oxygen supply, metallurgy steelmaking, welding and cutting, aerospace propellant and other fields, belongs to the strong oxidizing high-risk medium.
Relevant Article: What is Liquid Oxygen Cryogenic Storage Tank?
Liquefied natural gas (LNG, -162 ℃): industrial clean energy, widely used in plant gas supply, energy storage and transportation, distributed power generation scenarios.
Auxiliary cryogenic media: liquid carbon dioxide, neon, krypton, xenon and other specialty gases, mostly used in food processing, laser equipment, high-end medical imaging and other niche scenarios.
Professional cryogenic storage tank selection, can not rely on experience to prejudge, must follow the “medium → capacity → pressure → insulation → site → compliance” standardized process. 6 steps step by step, comprehensively match the production conditions of enterprises, taking into account the safety, economy and practicality.
The storage medium is the core premise for deciding the material of cryogenic storage tanks, thermal insulation program, safety configuration and cleanliness standard. The boiling point of different cryogenic gases, chemical properties, safety risks are very different, general storage tanks can not be adapted to all media.
First of all, we need to clarify the precise category of media and purity level, distinguish between industrial grade, food grade, medical grade, electronic high purity level, different levels of internal tank finish, cleanliness, material purity requirements are completely different.
Secondly, according to the medium safety features matching equipment configuration: liquid oxygen is a strong oxidizing medium, the tank must be professionally degreased and cleaned to prevent oil-induced safety accidents; liquid hydrogen, LNG belongs to the flammable and explosive medium, the need for supporting explosion-proof, grounding, leakage detection devices; liquid nitrogen, argon for the inert medium, the safety configuration is relatively conventional.
Finally, we need to refer to the medium SDS safety instructions, clear medium flammability, asphyxiation, corrosivity and other risks, in advance to match the ventilation, monitoring, pressure relief and other ancillary safety systems, from the source to avoid the media fit hidden dangers.
Storage tank capacity selection is the key to balance the stability of gas supply, procurement costs, operation and maintenance costs. Too small a capacity will lead to frequent replenishment, production interruption; too large a capacity will cause idle equipment, waste of space, high initial investment.
Capacity calculation needs to integrate four core parameters: average daily liquid consumption, replenishment cycle, natural evaporation loss, production peak margin, while distinguishing between total tank volume and effective usable volume (industrial tanks are routinely filled to 90%-95% of the upper limit, leaving room for expansion).
General capacity calculation formula: the total required tank capacity = (average daily liquid consumption × standard replenishment days) × (1 + loss margin) ÷ effective filling factor
General industry selection criteria: conventional industrial production scenarios, the replenishment cycle is recommended to reserve 3-4 weeks of consumption; remote plants, unstable supply scenarios, it is recommended to reserve 4-8 weeks of consumption, to avoid the risk of logistics disruption.
At the same time, the evaporation loss margin must be taken into account, the daily evaporation rate of high-quality storage tanks is about 0.3%-1%, long-term storage scenarios need to add an additional 20%-50% safety margin, to match the peak production season, equipment maintenance, sudden fluctuations in working conditions.
Scenario-based capacity reference: laboratory/medical scenarios are suitable for 500-5000L small and medium-sized tanks; small and medium-sized processing plants are suitable for 10,000-50,000L medium-sized tanks; large-scale factories, hospitals, energy stations are suitable for large-scale floor-to-ceiling tanks of more than 50,000L.
The working pressure of cryogenic storage tank directly determines the gas supply method, equipment cost, safety configuration and compliance standards. The core basis for pressure selection is the back-end production equipment gas pressure requirements, to avoid pressure mismatch leading to insufficient gas supply or equipment waste.
The industry will cryogenic storage tanks are divided into three major pressure levels, suitable for different industrial scenarios, the selection is clear and can be landed:
Low-pressure storage tank (0.1-3.5bar): suitable for large quantities of liquid nitrogen, liquid oxygen, liquid argon, LNG storage, with the use of gasifier, low cost, high security, is the mainstream choice for large industrial plants, the disadvantage is that it can not be directly high-pressure gas supply.
Medium-pressure storage tank (4-10bar): Suitable for small and medium-sized industrial gas supply scenarios, direct output of usable pressure gas, no need for complex supporting equipment, cost-effective and well-balanced, widely used in welding, conventional process gas.
High-pressure storage tank (10-40bar): mostly used for small portable Dewar bottles, special high-purity gas storage, gas supply pressure is stable, but the cost is high, evaporation loss is relatively larger, not suitable for large-scale batch storage.
Conventional industrial welding, food processing, general process protection scenarios, give priority to the use of 5-10bar rated pressure tanks, suitable for most of the back-end equipment needs, taking into account the flexibility and economy. All pressure storage tanks must pass the hydrostatic test, equipped with double pressure relief protection devices, in line with pressure vessel safety standards.
Thermal insulation performance is a measure of the quality of cryogenic storage tanks core indicators, directly determine the long-term operating costs. The better the insulation effect, the lower the daily evaporation rate, the lower the gas loss, long-term savings in media costs far exceed the difference in equipment prices.
At present, the industry mainstream four kinds of insulation technology, suitable for different media and working conditions:
High vacuum heat preservation: simple structure, suitable for small tanks, Dewar’s bottle, the daily evaporation rate of 0.5% -2%, suitable for laboratory, small scattered gas scenes.
Vacuum + pearl sand insulation: industrial general mainstream program, the highest cost-effective, daily evaporation rate of 0.4%-1.0%, perfect fit for liquid nitrogen, liquid oxygen, liquid argon conventional tanks, suitable for most of the factory scenarios.
Vacuum + multi-layer insulation (MLI): high-end thermal insulation solutions, thermal insulation performance is very strong, the daily evaporation rate can be as low as 0.2%-0.6%, specially adapted to liquid hydrogen, liquid helium and other ultra-low-temperature scarce media, significantly reduce the loss of valuable gases.
Foam + vacuum composite insulation: mostly used for LNG, liquid CO₂ storage, low cost, suitable for large fixed storage tanks, the disadvantage is that the evaporation loss is slightly higher than the multi-layer vacuum insulation structure.
Selection of core recommendations: conventional industrial media priority evaporation rate of ≤ 0.8% / day of pearl sand vacuum storage tanks; liquid hydrogen, liquid helium and other valuable ultra-low-temperature media, must be selected MLI multi-layer thermal insulation structure, strict control of loss. At the same time need to confirm the vacuum stability of the storage tank to protect 10-20 years of long-term use without significant attenuation.
Cryogenic storage tanks are divided into indoor installation and outdoor installation of two modes, including vertical, horizontal structure, site conditions directly determine the final selection, the wrong installation will lead to compliance does not pass, higher losses, operation and maintenance difficulties and other issues.
Indoor vs. outdoor installation of cryogenic storage tanks
Outdoor installation is the mainstream choice for industrial bulk storage tanks, no need to occupy the workshop production space, good natural ventilation conditions, gas leakage spread quickly, low safety risk, suitable for large tanks above 20000L, flammable and explosive media storage tanks (liquid hydrogen, LNG).
Outdoor storage tanks need to do a good job of sun, wind, lightning, seepage prevention foundation, high temperature areas can be added sunscreen coating to reduce the evaporation loss caused by the ambient temperature.
Indoor installation is only applicable to small tanks, mostly used in laboratories, medical departments, small clean rooms. Indoor installation must be equipped with forced ventilation system, oxygen concentration monitor, gas leakage alarm, to eliminate the risk of inert gas asphyxiation, combustible gas accumulation.
Vertical VS Horizontal Tank Selection Points
Vertical tanks: high space utilization, small footprint, stable thermal insulation performance, suitable for large-capacity, long-term fixed use of the scene, is the mainstream selection of factories, stations. The disadvantage is that the height is high, the site height, lifting conditions have certain requirements.
Horizontal tank: low center of gravity, strong stability, excellent seismic performance, suitable for the restricted floor height, indoor placement of the workshop, the need for frequent relocation of the scene. The disadvantage is that it covers a large area, and the cost of the same capacity is slightly higher than that of vertical storage tanks.
Cryogenic storage tanks are special pressure vessels, compliance is the bottom line selection, non-compliance equipment can not pass the safety inspection, can not be insured, there are major safety hazards. Selection must verify a full set of qualifications and standards compliance.
The global core standards include: ASME Pressure Vessel Standard, NFPA 55 Safety Code for Cryogenic Fluids, EU PED/EN 13458 standard, domestic pressure vessel national standard, CGA Gas Association safety standards.
The equipment must have complete certification marks, such as ASME U steel seal, CE certification, pressure vessel production license, etc. Meanwhile, we can provide a full set of material report, hydraulic test report, vacuum test report, factory inspection report and other information.
Safety configuration must be complete: double pressure relief valves, explosion-proof rupture discs, pressure monitoring devices, liquid level remote instrumentation, emergency shut-off valves; indoor scenes are additionally equipped with oxygen monitoring, exhaust interlocking devices; combustible media scenes supporting electrostatic grounding, leakage detection equipment.
Combined with the experience of industrial equipment operation and maintenance, most of the enterprise tank failure, cost waste, compliance issues, are derived from the selection stage of the details of the omission. The following ten high-frequency errors, is the core of the enterprise selection must be avoided minefield.
1, general tanks with special media: common tanks are not degreased and cleaned for liquid oxygen storage, not with high-end insulation storage of liquid hydrogen, easy to cause oxidation and combustion, media loss exceeds the standard, the purity of the gas does not meet the standard. Avoidance of the program: strictly according to the characteristics of the medium customized tank materials, cleaning standards and thermal insulation program.
2, capacity accounting is too conservative: only according to the average daily consumption selection, not taking into account the peak, replenishment delays, evaporation losses, resulting in frequent replenishment, production supply cuts. Avoidance program: fixed reserve 20% -50% safety margin, matching 3-8 weeks replenishment cycle.
3, ignoring the evaporation rate parameters: only look at the price of the equipment, ignoring the insulation performance, low-priced tanks evaporation rate exceeds the standard, the long-term cost of gas loss far exceeds the difference in price of the equipment. Avoidance program: Priority reference to the manufacturer’s official guarantee evaporation rate, balance the initial purchase cost and long-term operation and maintenance costs.
4, pressure level matching errors: high-pressure equipment with low-pressure tanks, resulting in insufficient gas supply; regular conditions with high-pressure tanks, resulting in waste of equipment. Avoidance of the program: strictly based on the back-end equipment gas pressure selection, conventional scenes preferred 5-10bar universal pressure level.
5、Irrational site planning: choose vertical tanks for insufficient floor height, horizontal tanks for narrow sites, and indoor installation of combustible media, resulting in failure of acceptance, operation and maintenance difficulties. Avoidance program: survey the site space, floor height, ventilation conditions in advance, matching the corresponding installation form.
6、Skipping compliance verification: choose unqualified, non-certified equipment from small factories, which will not be able to pass the acceptance of safety supervision and face the risk of work stoppage, rectification and fines. Avoid the program: give priority to fully qualified, can provide a full set of test reports of the regular manufacturers.
7, only than the price does not look at the full life cycle cost: simply the pursuit of low-priced equipment, ignoring the late high wear and tear, high maintenance, high outage costs. Avoidance program: the whole life cycle TCO costs for the core selection basis, rather than a single initial purchase price.
8、Missing auxiliary equipment: only purchasing tanks, not with gasifier, monitoring instruments, interlocking alarm equipment, resulting in unstable gas supply, no safety warning. Avoidance of the program: according to the need to match a full set of auxiliary systems, automated monitoring, safety protection.
9, no long-term operation and maintenance planning: no consideration of vacuum maintenance, regular testing needs, the equipment used for several years, insulation performance degradation, frequent failures. Avoidance program: select the vacuum recheck, maintenance of mature equipment, the establishment of annual operation and maintenance plan.
10, parameter labeling fuzzy: procurement contract only marked capacity, pressure, not clear evaporation rate, material, insulation type, leading to manufacturers cut corners. Avoid the program: all core technical parameters, performance indicators written into the procurement contract, clear warranty standards.
Core requirements: high purity media, low evaporation loss, stable equipment, safe and controllable, to ensure the safety of cells, vaccines, biological samples cryogenic storage.
Selection plan: 500-5000L vertical cryogenic storage tank, medium-low pressure grade, vacuum + pearl sand / MLI insulation, indoor installation, supporting oxygen monitoring, liquid level telemetry device, daily evaporation rate ≤ 1%.
Core requirements: continuous and stable gas supply, cost-effective, convenient operation and maintenance, suitable for welding, cutting, quick-freezing, inert protection conditions.
Selection plan: 10,000-50,000L vertical tank, 3-8bar medium-low pressure, vacuum pearl sand insulation, outdoor floor installation, supporting gasifier, remote monitoring system, evaporation rate 0.6%-0.8%.
Core requirements: large storage capacity, high security, redundant backup, zero interruption of supply, to protect the medical emergency, continuous production needs.
Selection scheme: large vertical low-pressure storage tank above 50000L, special degreasing tank for liquid oxygen, double safety pressure relief system, outdoor compliant installation, supporting emergency backup gas supply interface.
Core requirements: extreme thermal insulation, low loss, explosion-proof and anti-static, high safety level, suitable for clean energy storage conditions.
Selection plan: customized 5000-100000L storage tank, MLI multi-layer high-end thermal insulation structure, daily evaporation rate <0.5%, anti-explosion and anti-static configurations, outdoor safety spacing installation, supporting exclusive leakage monitoring equipment.
Core requirements: large capacity, high stability, anti-leakage, suitable for long-term energy storage and gas supply.
Selection scheme: vertical floor-standing storage tanks above 100000L, vacuum composite heat preservation, low-pressure design, equipped with secondary anti-seepage and anti-roll-over systems, fully compliant with LNG industry-specific standards.
With decades of low-temperature engineering heritage derived from the Institute of Physics and Chemistry, Chinese Academy of Sciences, Fullcryo has established itself as a leading global specialist in cryogenic storage and transportation technology. Focused on independent R&D and industrialization of ultra-low-temperature cryogenic systems, Fullcryo has broken long-term overseas technical monopolies and built a full industrial chain for cryogenic liquid storage, transportation, and application.
As a key national R&D participant for liquid hydrogen storage and transportation projects, Fullcryo has successfully completed China’s first civil liquid hydrogen production, storage, and transportation demonstration project. The company has mastered core technologies including high-efficiency multi-layer insulation (MLI), ultra-low heat-leak vacuum sealing, and large-scale cryogenic vessel structural safety design — all of which lay a solid technical foundation for its full-range cryogenic tank product lineup.
Equipped with a large-scale intelligent manufacturing base and full-class pressure vessel production qualifications, Fullcryo designs and manufactures a complete portfolio of vertical, horizontal, stationary, and portable cryogenic storage tanks. These tanks cover a wide range of cryogenic media, including liquid nitrogen, liquid oxygen, liquid argon, liquid helium, liquid hydrogen, and LNG.
For standard industrial gas applications, Fullcryo’s vacuum-perlite insulated bulk cryogenic tanks deliver ultra-low boil-off rates between 0.4%–0.8% per day. For extreme cryogenic media such as liquid hydrogen and liquid helium, our advanced MLI vacuum insulation system ensures long-term vacuum stability and restricts daily boil-off loss below 0.5%, significantly reducing operational costs and product waste for end users.
All Fullcryo cryogenic storage tanks comply with international industry standards including ASME, NFPA, and PED. Equipped with professional vaporization systems, real-time monitoring, and full safety relief configurations, our tank solutions serve global customers across medical biotechnology, precision manufacturing, electronics, new energy hydrogen industries, and LNG sectors.
Trusted worldwide, Fullcryo delivers high-reliability, low-loss, cost-effective cryogenic storage tanks and one-stop cryogenic engineering solutions for industrial gas and clean energy projects globally.
Q1: What is the optimal daily evaporation rate for industrial liquid nitrogen storage tanks?
For routine industrial scenarios, tanks with daily evaporation rate of 0.4%-0.8% are preferred for the best cost performance; for scientific research and high purity storage scenarios, it is recommended to choose low-loss tanks with ≤0.5%.
Q2: Is it necessary to use MLI multi-layer insulation for liquid hydrogen storage tanks?
Yes, it is. Liquid hydrogen boiling point is extremely low, ordinary pearl sand insulation loss is too high, must be matched with MLI multi-layer vacuum insulation structure, in order to meet the needs of long-term storage to reduce consumption.
Q3: Should I choose vertical or horizontal storage tanks for small and medium-sized plants?
Sufficient space, long-term fixed use of priority for vertical, small footprint, cost-effective; floor height restrictions, indoor installation, the need to relocate equipment, priority for horizontal.
Q4：Can cryogenic storage tanks be installed indoors?
Small inert gas storage tanks can be installed indoors, but must be equipped with ventilation, gas monitoring and alarm devices; liquid hydrogen, LNG, large-capacity tanks are strictly prohibited indoor installation.
Q5：How long is the service life of cryogenic storage tank?
Regular manufacturers of compliant equipment, normal operation and maintenance, the service life of up to 20-30 years, the core vacuum insulation performance can be stabilized for more than 10 years.
Selecting an industrial cryogenic storage tank is a complex system engineering project that balances safety, expertise, and economy; it’s not simply a matter of choosing the right size and price. If you require a customized industrial cryogenic storage tank that is suitable for your specific operating conditions, highly compliant, and with low loss, please contact Fullcryo. As a professional cryogenic storage tank manufacturer, Fullcryo provides one-on-one site surveys, selection solutions, customized production, and one-stop after-sales maintenance services.
