Cryogenic tank is the core special equipment for storing cryogenic liquefied gas. The rationality of tank selection directly determines the operation safety, energy consumption cost and long-term operation and maintenance efficiency of the project. This article is a comprehensive guide for systematic cryogenic tank selection, from the definition of zero disassembly cryogenic tank, suitable medium, application scenario, parameters, size calculation method, safety configuration and supplier screening criteria.
Cryogenic storage tank is a special pressure vessel with vacuum insulation structure, mainly used for storing liquefied industrial gases below-150℃. Compared with ordinary pressure vessels, the core of cryogenic storage tanks is low temperature toughness, vacuum insulation and pressure stabilization, safety relief protection, and adaptation to long-term low temperature storage conditions.
Cryogenic liquefaction compresses gases to 1/600 – 1/800 of atmospheric gas volume, significantly reducing storage and transportation space costs. This is also the core advantage of industrial scale centralized liquid storage and replacement of scattered cylinder gas supply.
Cryogenic liquid will expand hundreds of times after vaporization, and pressure fluctuation is easy to occur under closed conditions. Therefore, cryogenic storage tanks are not only liquid storage equipment, but also safety equipment to ensure stable gas supply and avoid overpressure and leakage risks in the plant.
The boiling point, activity and explosion risk of different low temperature media are quite different. The material, cleaning process, insulation grade and safety configuration of storage tank shall be matched accordingly, and cannot be mixed in general.
Liquid oxygen is a strong oxidant, which is easy to cause explosion risk when it meets oil pollution and hydrocarbon impurities. Liquid oxygen cryogenic storage tanks are generally cleaned without oil pollution, and the explosion-proof and oxidation-resistant capabilities of valves, seals and pipelines are required to be higher.
Liquid nitrogen is an inert, nonflammable, highly stable cryogenic medium, and is the most popular cryogenic gas for industrial applications. Liquid nitrogen cryogenic storage tank has low adaptation threshold and strong versatility.
Liquid argon is a rare inert gas, chemically stable and free of explosion risk. The selection focuses on stable pressure output and low natural evaporation losses.
Liquid hydrogen has extremely low temperature, low latent heat of vaporization, strong flammability, and heat intrusion is easy to cause dielectric loss. This kind of medium generally needs high-performance multi-layer vacuum insulation structure, which is different from other cryogenic tanks.
Liquid helium is the lowest known boiling point medium, with a very low heat capacity, and a small amount of heat can cause significant vaporization. Storage is difficult, and customized ultra-high vacuum insulation structures are often used.
LNG is mainly composed of methane, which belongs to flammable low temperature medium. After liquefaction, its volume is greatly reduced, which is suitable for large-scale storage and transportation. Large LNG storage tanks are usually made of special cryogenic steel and tank structure design.
According to the installation form, use scenario and transportation attributes, industrial common cryogenic storage tanks can be divided into five categories, different types of structural design, installation conditions, adaptation conditions are obviously different, is the basis for early selection.
Cylindrical structure is adopted, and the whole structure is horizontally erected and installed, and fixed by saddle bracket. The overall height of the equipment is low, which is not limited by the floor height of the site, and is suitable for skid-mounted integration and mobile use scenarios. Horizontal cryogenic tanks are mainly used for industrial gas distribution, mobile refueling stations, and plant workshops with limited floor height.
The cylindrical tank is vertically fixed to the concrete foundation and is a fixed installation structure. Small footprint, high space utilization, smooth drainage, low basic operation and maintenance costs. Vertical cryogenic tanks are widely used in permanent on-site centralized gas supply and liquid storage systems in large manufacturing plants and energy plants.
Small and lightweight vacuum insulated container, portable, mobile, simple to operate, and no complex installation required. Cryogenic Dewar tanks are commonly used in laboratory cryogenic experiments, sample freezing in medical institutions, and intermittent gas use scenarios in small-scale industries.
Standardized modular cryogenic storage and transportation equipment, with vacuum insulation structure, fully in line with ISO international standards. Support highway, railway, maritime multimodal transport, versatility is very strong. ISO cryogenic tank containers are mainly used for cross-regional and global bulk storage and transportation of LNG, liquid nitrogen, liquid oxygen, liquid argon and other cryogenic media.
Designed for long-distance liquid gas transportation, sealing and thermal insulation performance stability, can realize large-scale medium transfer. Cryogenic semi-trailers for industrial gas are mostly used for remote cryogenic gas supply in remote factories, satellite storage stations and distributed energy projects.
Cryogenic tank selection is a multi-dimensional matching process, the core around the medium, volume, pressure, structure, insulation, material, interface, compliance eight dimensions, to avoid a single parameter decision.
The medium properties determine the cleaning process, insulation level and safety configuration of the tank, which is the first priority for selection. Inert medium working condition standard is moderate, oxidizing, flammable, ultra-low temperature medium needs to upgrade configuration.
Liquid oxygen needs professional cleaning and degreasing treatment;LNG adopts special cryogenic steel tank; liquid hydrogen and liquid helium are suitable for multi-layer super insulation structure to prevent excessive vaporization loss.
Nominal tank volume does not equal actual usable volume. The industry’s conventional filling safety interval is mostly 90%-95%, with gas phase space reserved to buffer thermal expansion and pressure fluctuations.
Small 450L-3000L tanks are suitable for laboratories, clinics and small workshops; industrial tanks above 5m³ are suitable for large-scale continuous gas use. The model selection should take into account daily load, peak gas consumption and long-term expansion.
The conventional pressure range of industrial cryogenic tanks is mostly concentrated in 8 – 24bar, and customized high pressure cryogenic tanks can reach about 36bar, depending on the equipment design parameters. Low pressure and low temperature storage tanks have lower procurement costs and are suitable for simple liquid storage and low pressure stabilized gas supply. High pressure and low temperature storage tank can be directly connected to the rear pipeline and vaporization equipment, without additional pressurization device, suitable for high pressure production line.
Vertical cryogenic storage tank occupies a small area, simple foundation construction, smooth drainage, is the mainstream choice of factories, hospitals, industrial parks, suitable for compact site scenarios. Horizontal cryogenic storage tank overall height is lower, suitable for high-limit workshop, skid-mounted integration, mobile gas supply scenarios, later maintenance and maintenance operations are more convenient.
Vacuum insulation structure directly determines the natural evaporation rate (NER/BOR) of cryogenic storage tanks, which is a key parameter affecting long-term operation and maintenance costs, and is also the core of distinguishing equipment quality.
Conventional industrial storage tanks mostly adopt vacuum + perlite insulation, with outstanding cost performance. Multi-layer vacuum insulation (MLI) is commonly used for high-value, ultra-low temperature medium storage tanks, with better insulation performance and lower loss.
High quality equipment factory vacuum is generally high, and configuration adsorbent to maintain long-term vacuum stability. Procurement preference is given to reference to cryogenic tank manufacturer’s measured warranty evaporation rates rather than theoretical parameters.
Cryogenic storage tank is double-layer structure, and the material division of inner and outer tanks is clear, so it needs to adapt to low temperature working conditions to avoid low temperature brittle crack and corrosion risk.
304L and 316L austenitic stainless steel are commonly used in inner tanks, and 9% nickel steel is often used in large LNG tanks. The outer tank is mostly carbon steel, responsible for structural support and vacuum sealing.
Regular equipment needs to complete weld nondestructive testing, helium leakage detection, hydraulic pressure test, to ensure long-term low temperature operation of the tightness and structural stability.
Standard configuration includes interfaces for filling, return, pressurization, venting, instrument monitoring, etc. All valves shall be suitable for low temperature conditions. Liquid oxygen operating conditions need to meet additional requirements for cleaning and degreasing.
Supporting emergency cut-off, anti-static grounding structure, can effectively avoid the pipeline liquid accumulation, pressure, static accumulation caused by safety hazards.
Cryogenic storage tank belongs to special equipment, which needs to comply with territorial and industrial specifications. The certification system is different in different regions, and there is no general standard. Procurement requires a complete material certificate, inspection report, compliance documents to ensure smooth acceptance and annual inspection.
Different industries have different gas continuity, cleanliness requirements, site conditions and safety specifications. The tank selection does not need to pursue high configuration, and the optimal cost performance can be achieved under fitting conditions.
Mainly liquid oxygen and liquid nitrogen cryogenic storage tanks, priority shall be given to ensuring equipment stability, medium cleanliness and emergency gas supply capability. It is mainly used for ward oxygen supply, biological sample freezing and medical hypothermia treatment.
Low evaporation rate, no impurity pollution, stable output, meet the continuous and reliable gas demand of hospitals.
LNG and liquid hydrogen storage tanks are core equipment, focusing on ultra-low evaporation loss, long-term vacuum stability and explosion-proof safety configuration. Adapt to power station peak shaving, ship filling and hydrogen energy storage projects.
For cryogenic storage tanks used in new energy projects, full life cycle performance is more important, and models with perfect warranty and clear measured loss data are preferred.
Liquid nitrogen, liquid oxygen and liquid argon storage tanks are used as the main centralized gas supply to replace the frequent bottle replacement of traditional steel cylinders and improve the continuity of production lines. Suitable for cutting, welding, heat treatment, chemical synthesis conditions. The selection of cryogenic tanks for industrial metal processing requires matching project supply pressure, sufficient volume reserve, stable daily operation, and reduced labor and downtime costs.
Liquid nitrogen cryogenic tanks are mainly used to complete the rapid freezing, fresh-locking and modified atmosphere packaging processes, requiring clean media, stable gas supply and no risk of secondary pollution. Low-temperature storage tanks used in the food industry are mainly conventional industrial-grade low-loss storage tanks, focusing on continuous production and low-maintenance intervention.
Storage of liquid oxygen, liquid hydrogen propellant and high-purity low-temperature medium requires extremely high structural strength, impact resistance, heat preservation performance and compliance qualification of equipment.
The scientific research scene is equipped with liquid helium ultra-low temperature storage tank, and customized high vacuum, low heat leakage and high precision monitoring equipment are preferred.
Inert protective atmosphere of dust-free workshop is constructed by high purity liquid nitrogen and liquid argon to prevent oxidation pollution of chips and precision components. The selection focuses on medium purity, clean process inside the tank, stable and low-loss operation, and precision manufacturing standards.
The safety design of cryogenic storage tanks focuses on multiple redundant protection to avoid safety risks caused by single point failures and meet the acceptance requirements of conventional special equipment.
The service life of cryogenic storage tanks is generally as long as 20-30 years. The technical strength, quality control system and after-sales guarantee of cryogenic storage tank manufacturers directly determine the long-term stability of equipment.
Determine the storage medium to accounting with gas load and volume, matching pressure and site structure to confirm the thermal insulation evaporation performance, check the safety configuration and compliance qualification, screening regular manufacturers.
The vertical type is selected due to narrow site and low capital construction cost; the horizontal type is selected due to limited floor height and skid-mounted migration, and maintenance convenience is emphasized.
The core depends on the manufacturer’s measured quality assurance evaporation rate and vacuum maintenance scheme. Under the same volume, the comprehensive cost performance of stable and low-loss equipment is higher.
Yes, it is. Carry out appearance, pressure, liquid level and vacuum inspection every year, and complete comprehensive pressure resistance and leak detection re-inspection every 3 – 5 years in accordance with local special equipment specifications.
Regular annual appearance, pressure, liquid level, vacuum test, every 3-5 years for comprehensive pressure, leak detection calibration, strict compliance with local special equipment annual inspection specifications.
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