Welding Gases

Acetylene  |  Air  |  Argon  |  Carbon Dioxide(C0 2)  |  Helium
Hydrogen  |  Nitrogen  |  Oxygen  |  Propane

Oxygen
Oxygen, abbreviated O2, is a colorless, odorless, non-flammable gas.   It is an oxidizing gas at high pressure. Oxygen constitutes approximately 21% of the air.  When considered in other combinations such as water (H2O) oxygen makes up about 49% of the molecules on the earth's crust.

The oxygen molecule has a gaseous specific gravity of 1.1, and a boiling point of -297.3F (-183C). Oxygen is produced by air separation processes that use either cryogenic liquefaction and distillation or vacuum swing adsorption (VSA) separation.   Oxygen can be stored and shipped as either a gas or a cryogenic liquid.

The principal uses of oxygen stem from its strong oxidizing and life-sustaining properties.  It is used in medicine for therapeutic purposes.  Oxygen is used in the metals industry in conjunction with acetylene and other fuel gases in metal cutting, heating, welding, hardening, scarfing, cleaning, and dehydrating.  In the chemical and petroleum industries, oxygen is used in the production of synthetic gas from coal, natural gas, and liquid fuels.

DOT Information

DOT Name:       Oxygen
DOT Hazard Class:       Nonflammable Gas (2.2)
DOT Label:       Oxidizer and Nonflammable Gas
DOT ID No.:       UN 1072
CAS No.:       7782-44-7
Valve Outlet:       CGA 540, LB-CGA 110/170
         

Physical State in High Pressure Cylinder:  Gas

Toxicity:       Nontoxic; exposure to high concentrations adversely affects pulmonary and central nervous systems.
Fire Potential:       Strong oxidizer; supports and vigorously accelerates combustion. Avoid contact with oil, grease, or other combustible materials.
Compatible Materials:       Noncorrosive; structural materials must be suitable for oxygen service.
         
Physical Properties of Oxygen
Formula:       O2
Molecular Weight:       32.00 lb/mol
Specific Volume at 70F and 1 atm:       12.1 ft3/lb (0.755m3/kg)
Specific Heat:        7.03 BTU/lbmol-deg F@ 70 deg. F
Specific Gravity:       1.1
Gas Density:       0.08281 lb/ ft3 @ 70 deg. F. 14.7 PSIA
         
Boiling Point
Temperature:       -297.37 deg. F (-183.0 deg. C)
Liquid Density:       71.23 lb./ft3
Latent Heat:       91.4 BTU/lb.
         

Critical Point

Temperature:       -181.4 deg. F
Pressure:       731.4 PSIA
         

Melting Point

Temperature:       -361.8 deg. F
Pressure:       0.0220 PSIA

  

Industrial Cylinders

PART NUMBER

CYLINDER SIZE

WEIGHT OF GAS
(LB-OZ)

PRESSURE
(PSI @ 70F)

DIMENSIONS
(Height x Diameter)

CAPACITY
(Gallons)

CAPACITY
(Liters)

OXY020

20 ft3

1-10.6

2015

18" x 5-1/2"

150

567

OXY125

125 ft3

10-5.6

2217

47" x 7"

935 3540

OXY251

251 ft3

20-12.6

2217

51" x 9"

1878 7108

OXY337

337 ft3

27-14.5

2640

55" x 9.25"

2521 9544

Medical Compressed Gas Cylinders

PART NUMBER

CYLINDER SIZE

WEIGHT OF GAS
(LB-OZ)

PRESSURE
(PSI @ 70F)

DIMENSIONS
(Height x Diameter)

CAPACITY
(Gallons)

CAPACITY
(Liters)

OXYD

15 ft3

1-3.9

2015

20" x 4.25"

112

425

OXYE

24.9 ft3

2-1.0

2015

30" x 4.25"

186

705

OXYM

125 ft3

10-5.6

2217

47" x 7"

935 3540

OXYH

251 ft3

20-12.6

2217

51" x 9"

1878 7108

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