Gas supplyTechnical gas supply

Cryogenic liquid gases

  • kosmicheskaya_promishlennost.jpg
  • kosmicheskoe_toplivo.jpg
  • kriogazy.jpg
  • kriogazy2.jpeg
  • pogrugnoe_ohlagdenie.jpg
  • zamorozka_produktov.jpg

Cryogenic liquid gases

Cryogenic liquids are liquefied gases that are kept in their liquid state at very low temperatures. The word "cryogenic" means "producing, or related to, low temperatures," and all cryogenic liquids are extremely cold. Cryogenic liquids have boiling points below -150°C (- 238°F) (Carbon dioxide and nitrous oxide, which have slightly higher boiling points are sometimes included in this category). 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.

The vapours and gases released from cryogenic liquids also remain very cold. They often condense the moisture in air, creating a highly visible fog. In poorly insulated containers, some cryogenic liquids actually condense the surrounding air, forming a liquid air mixture. Cryogenic liquids are classified as "compressed gases" according to WHMIS 1988 criteria. Details of these criteria can be found in the Controlled Products Regulations.
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.

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).

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

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

Food industry:

Freezing and chilling of food products. Liquid carbon dioxide used in the manufacture of pharmaceutical preparations.

Transportation and aircraft:

The development of a new generation of engines, requiring more powerful refrigerants.

Cryogenic  fuels in 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.

Firefighting:
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.

Engineering:
Liquid helium is widely used in various kryounits, medical equipment and as a cooling agent to the superconducting magnet systems, and so forth.

Gas supply:

Liquid gases occupy less space and require less transportation costs than the gaseous.

Our 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.

Company WestMedGroup delivers the cryogenic dewars by companies HVM (CRIOLAB, CRIOLIQ CRIOGAS 25 and 25, CRIOSMALL 6, CRIOLIQ CRIOGAS 16 and 16, CRIOLOGY 4, OXYBLU & OXYLIGHT, CRIOLNG 16, CRIOMEGA 8).

This is metal tanks with vacuum insulation walls for storage and transportation of liquid gases.