نسیم صبح فردا

Air

What is air?

  • Air is the Earth’s natural atmosphere.
  • Air-gas is non-flammable, colorless, odorless, and non-corrosive, and composed.
  • Air is a mixture of gases, such as argon, water vapor, a small amount of CO2, Oxygen, nitrogen, and small amounts of various other gases.
  • In the industry, artificial air is produced by combining oxygen and pure nitrogen in the form of 19.5 to 23.5% auxin with nitrogen balance.
  • The air in the liquid phase, a clear liquid with a blue tint and in the presence of CO2 In it, a little milky color.

Available grades:

  • The amount of humidity in the air varies from one height to another and from region to region.
  • In the zero or synthetic air industry, it is deliberately produced from a combination of pure oxygen and pure nitrogen, so it is expressed by the purity of the components used in production.
  • For example, the 5.0N grade of air, which represents the air produced from a combination of 19.5 to 23.5% of 5.0N grade oxygen with 5.0N nitrogen balance.

storage and transport tanks:

  • Compressed air is stored and transported in pressurized cylinders with different pressures and with different volumes.

Compatible and incompatible materials:

  1. Dry air is non-corrosive.
  2. The equipment in contact with it can be made of any ordinary metal.
  3. Gaseous air is usually carried in pressurized cylinders, tubes, and tube trailers.

 

 

Molecular Weight 28.975
steam pressure 2484 K. Pa @ -150 0C
Gas density 1.2 Kg/m3 @ 21.1 0C and 1 atm
The latent heat of evaporation at the boiling point 205 KJ/Kg
Special heat capacity CP=1.01 KJ/Kg.0C

CV=0.720 KJ/Kg.0C

CP/CV=1.40

Critical temperature -140.60C
Critical pressure 3771 KPa(a)
Solubility in water 0.0292 vol.(gas)/Vol.(Water) at 00C and 1 atm
Explosion / ignition range in air  Non-Flammable Gas

Material Compatibility of Air

 

METALS PLASTICS ELASTOMERS

Brass

CARBON STEEL

StainLess Steel

Alumium

Zinc

CoPPER

Monel

Kel-F

Teflon

Tefzel

Kynar

PVC

Polycarbonate

Viton® Buna-N Neoprene Polyurethane

O

Kalrez

GAS

 

S – Satisfactory for use with the intended gas
C – Conditional. May be incompatible under some circumstances or conditions Contact your Praxair representative for additional information
U – Unsatisfactory for use with the intended gas
I – Insufficient data available to determine compatibility with the intended gas
O – All nonmetalic, even those considered compatible, may be ignitable in oxygen enriched environments or in other oxidizing gases. Successful
use depends upon oxygen purity, pressure, temperature, cleanliness and elimination of ignition mechanisms. Please contact your Praxair
Representative for additional information

Classification of dangerous Products:

Dangerous Products Transport Information:

 

IATA IMDG DOT
UN 1002 UN 1002 UN 1002 UN NUMBER
Air, compressed Air, compressed Air, compressed UN SHIPPING NAME
2.2 2.2 2.2 TRANSPORT HAZARD CLASS
NO NO NO ENVIRONMENTAL HAZARD

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