Welding Gases

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

Nitrogen
Nitrogen (N2) constitutes 78.03% of the air, has a gaseous specific gravity of 0.967, and has a boiling point of -320.5F (-195.8C) at atmospheric pressure.  It is colorless, odorless, and tasteless.   Nitrogen is often used as an "inert" gas due to its nonreactive nature with many materials.   Common uses of gaseous nitrogen are found in electrical systems, chemical manufacturing, purging, and air-powered tools.  Liquid nitrogen, produced by the cryogenic air separation process, finds wide use as a refrigerant gas in applications such as cryogenic grinding of plastics and food packaging. 

Commercial nitrogen is produced by a variety of air separation processes, including cryogenic liquefaction and distillation, pressure swing adsorption (PSA), and membrane separation.

Nitrogen can react to form certain compounds under the influence of chemicals, catalysts, or high temperature; therefore it is not used as a shielding gas in the welding industry.

DOT Information  
DOT Name:       Nitrogen
DOT Hazard Class:       Nonflammable Gas
DOT Label:       Nonflammable Gas
DOT ID No.:       UN1066
CAS No.:       7727-37-9
Valve Outlet:       CGA 580
         
Physical State in High Pressure Cylinder:Gas
Major Hazards:       High Pressure, Suffocation
Fire Potential:       Nonflammable
         

Physical Properties of Nitrogen

Formula:       N2
Molecular Weight:       28.013 lb/mol
Specific Volume at 70F and 1 atm:       13.8 ft3/lb (12.00 m3/kg)
Specific Heat:       6.97 BTU/lbmol-deg F@ 70 deg. F
Specific Gravity:        .967
Gas Density:       0.07247 lb/ ft3 @ 70 deg. F. 14.7 PSIA
         
Boiling Point
Temperature: -320.5 deg. F (-195.8 deg. C)
Liquid Density:       50.50 lb./ft3
Latent Heat:       85.5 BTU/lb.
         

Critical Point

Temperature:       -232.4 deg. F
Pressure:       492.9 PSIA
         

Melting Point

Temperature:        -346.0 deg. F
Pressure:       1.82 PSIA

 

Industrial Compressed Gas Cylinders
* Denotes lightweight aluminum cylinder

PART
NUMBER

CYL
SIZE

WEIGHT
OF GAS (LBS.)

APPROX. WT OF FULL
CYL (LBS.)

PRESSURE
(PSI @ 70F)

GALLONS

LITERS

DIMENSIONS
(Height x Diameter)

NIT020

20 ft3

1.449

14

2015

149

566

18" x 5-1/2"

NIT058*

58 ft3

4.202

25

2015

433

1642

27" x 8"

NIT115

115 ft3

8.3313

65

2217

860

3257

48" x 7"

NIT143*

143 ft3

10.360

52

2217

1069

4049

47" x  8"

NIT230

230 ft3

16.663

150

2217

1721

6514

51" x 9"

NIT304

304 ft3

22.025

180

2640

2274

8609

55" x 9-1/4"

 

Medical Compressed Gas Cylinders

PART
NUMBER

CYL
SIZE

WEIGHT
OF GAS (LBS.)

APPROX. WT OF FULL
CYL. (LBS.)

PRESSURE
(PSI @ 70F)

GALLONS

LITERS

DIMENSIONS
(Height x Diameter)

NITE

23 ft3

1.667

10

2015

172

651

30" x 4-1/4

NITM

115 ft3

8.3313

65

2217

860

3257

48" x 7"

NITH

230

16.663

150

2217

1721

6514

51" x 9"

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