Welding Gases
Acetylene | Air | Argon | Carbon Dioxide(CO2) | 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 -297.3°F (-183°C). 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 |
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| 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 |
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| 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 70°F 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 |
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| Temperature: | -181.4 deg. F | |
| Pressure: | 731.4 PSIA | |
Melting Point |
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| Temperature: | -361.8 deg. F | |
| Pressure: | 0.0220 PSIA | |
Industrial Cylinders
PART NUMBER |
CYLINDER SIZE |
WEIGHT
OF GAS |
PRESSURE |
DIMENSIONS |
CAPACITY |
CAPACITY |
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 |
PRESSURE |
DIMENSIONS |
CAPACITY |
CAPACITY |
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 |
