Go to top

Cryogenic liquid gases

  • 0raketa.jpg
  • kosmicheskoe_toplivo.jpg
  • kriogazy.jpg

Cryogenic liquid gases

Cryogenic liquids are liquefied gases that are kept in their liquid state at very low temperatures.

All cryogenic liquids are gases at normal temperatures and pressures. These gases must be cooled below room temperature before an increase in pressure can liquefy them. Different cryogens become liquids under different conditions of temperature and pressure, but all have two properties in common: they are extremely cold, and small amounts of liquid can expand into very large volumes of gas.

Cryogenic considered temperatures below 120 K (-153o C). First, air compressed by the compressor, and then, after passing through the heat exchangers, is expanded in an expander machine, or throttling valve, whereby the temperature cooled to 93 ° K and is converted into liquid. Further separation of liquid air, consisting mostly of liquid nitrogen and liquid oxygen, based on the difference in the boiling point of its components: oxygen - 90,18 ° K, N - 77,36 ° K.

The main technical advantages of the cryogenic process are guaranteed high purity at a constant flow rate, and low specific energy consumption for the entire period of operation.

Minimization of rotating and moving parts ensure a long service life of the cryogenic plants.

The main thing in working with cryogenic liquids is the invariability of their compositions. The temperature of their storage often changes the physico-mechanical features of containers. Therefore, cryogenic liquids are stored in special vessels with a unique powder-vacuum and screen-vacuum heat-insulating capacity. 

  • Liquid nitrogen - colorless, odorless, tasteless, non-flammable gas. At atmospheric pressure, liquid nitrogen has a temperature of -196 ° C, extracted from air (78% N2), stored and transported in insulated containers neutral.
  • The liquid carbon dioxide - a colorless gas with a slightly sour taste, is non-flammable, readily soluble in water. Store in a liquid state under pressure. At atmospheric pressure it becomes equal proportions in the snow and gas at a temperature of -78 ° C, produced in the chemical industry or from natural sources, is stored in containers under pressure, at -20 ° C.
  • Liquid oxygen - liquid pale blue color, which refers to the strong paramagnetic. It is one of the four states of aggregation of oxygen. It has a density of 1.141 g / cm³ and has properties with moderate cryogenic freezing point of 50,5 K (-222,65 ° C) and a boiling point of 90,188 K (-182,96 ° C).

Norms of filling vessels

Gas

Weight per 1 liter of the liquid container vessel, kg, no more then

The capacity of the vessel,
per 1kg of gas, L

Водород

0,065

15

Гелий

0,11

9

Кислород

1,08

0,926

Азот

0,77

1,3

Marking of vessels for cryogenic liquids

Gas

Cylinders painting

Label

Label color

Stripes color

Nitrogen

Black

Nitrogen

Yellow

Brown

Argon, raw

Black

Argon, raw

White

Navy blue

Argon, technical

Black

Argon, technical

Navy blue

Navy blue

Argon, pure

Grey

Argon, pure

Green

Green

Helium

Brown

Helium

White

Black

Oxygen

Blue

Oxygen

Black

Black

Medical oxygen

Blue

Medical oxygen

Black

Black

All other flammable gases

Red

All other flammable gases

White

Green

All other non-flammable gases

Black

All other non-flammable gases

Yellow

Green

Application
Freezing and chilling of food products. Liquid carbon dioxide used in the manufacture of pharmaceutical preparations.
The development of a new generation of engines, requiring more powerful refrigerants.
Cryogenic fuels are usedin the aerospace industry.
The expansion ratio of oxygen by changing the liquid to a gaseous state of aggregation of 860: 1 at 20 ° C, which is sometimes used in supply systems with oxygen for breathing in commercial and military aircraft, the operation of submarines. Liquid oxygen is also used extensively in the manufacture of explosives.
Liquid nitrogen is highly effective in fighting fires. It displaces oxygen than almost instantly relieves burning hearth. At the same time it is completely vaporized than not cause harmful effects to the environment.
Liquid helium is widely used in various kryounits, medical equipment and as a cooling agent to the superconducting magnet systems, and so forth.
Liquid gases occupy less space and require less transportation costs than the gaseous. 

Equipment
Liquefied gases are stored and transported in special containers (tanks) equipped with high thermal insulation.
For transportation and storage of a relatively small amount of cryogenic liquid (from a few liters to several tens of liters) there are dewars. These are metal tanks with vacuum thermal insulation of the walls for storing and transporting liquid gases.

There are no standard factory rules for the production of cryogas - the installation is always made according to individual parameters: pressure, gas composition, impurities, energy costs.
Our company will help to organize on your site the entire technological chain of production - cryogenic pumps, gasifiers, atmospheric evaporators, as well as systems for transporting dewar from small volumes to tankers. Our engineers will help to calculate the needs of production, draw up a project, implement it and provide the subsequent technical support.

Designing

Thorough study of construction, technological and operational tasks, taking into account the requirements stipulated by the relevant regulatory documents for the design of hospitals and polyclinics. 3D-visualization of architectural solutions and technological processes.

Manufacturing

Production of high-tech equipment for medical gas supply systems, which includes compressor and vacuum stations, oxygen generators and a wide range of medical consoles and their components. The production meets the requirements of domestic and European quality and safety standards.

Construction

Our specialists carry out a full list of works on construction, overhaul and reconstruction of health facilities, including such stages as: organization and holding of a tender, obtaining initial permits, passing state expertise, technical supervision and construction control, putting the facility into operation.

Supply of equipment

Equipping of medical institutions with high-tech equipment and medical equipment of leading domestic and foreign manufacturers. Monitoring of technical innovations allows you to purchase medical engineering systems and equipment of the latest generation with effective innovative solutions.

Installation

Installation of medical gas systems, equipment, ventilation systems, as well as structural elements of clean rooms. WestMedGroup provides a full range of installation services using the latest advanced technologies.

Maintenance

Maintenance and repair of medical equipment in accordance with the manufacturer's standards. Specialists of our company restore the efficiency of the equipment, replace the units worn out during operation. The guarantee of impeccable quality of the works performed is the availability of WestMedGroup's existing quality management system, licenses for production and maintenance of medical equipment.

Training

Professional development, training and retraining of technical staff in designing health systems of gas supply, installation, operation and maintenance of the medical equipment is carried on professional courses and workshops, after which the certificate is issued

Write answer 2 + 2 =

By clicking the "Send request" button, you consent to the processing of your personal data. Privacy Policy
Thansk!

Your message has been sent.

We will contact You.