Welding Gases

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

Acetylene
Acetylene (C2H2), a compound of carbon and hydrogen, is a colorless, highly flammable gas. It is slightly lighter than air and has a garlic-like odor.  Acetylene is stored in high pressure cylinders filled with a porous material and containing acetone, into which the acetylene is dissolved.  Unless dissolved in a solvent, acetylene will dissociate at pressures above 15 psig and form lamp black and hydrogen.  Heat is generated with dissociation, which in turn, produces a danger of explosion.

Acetylene is manufactured by the reaction of water with calcium carbide.  It is also manufactured by thermal cracking of hydrocarbons, or by partial combustion of methane and oxygen.

Approximately 80% of the annual acetylene production of the United States is used for chemical syntheses.  Acetylene has become increasingly prominent as a raw material for a whole series of organic compounds, among them acetaldehyde, acetic gas, and acetic anhydride.  The remaining 20% of the acetylene production is principally used for oxy-acetylene cutting, heat treating, and welding.

DOT Information

DOT Name:        Acetylene
DOT Hazard Class:    Flammable Gas
DOT Label:   Flammable Gas
DOT ID No.:    UN1001
CAS No.:     74-86-2
Valve Outlet:   CGA 510
   

Physical State in High Pressure Cylinder:   Gas

Toxicity:       Simple Asphyxiant
Fire Potential:   Flammable 
     

Physical Properties of Acetylene

Formula:       C2H2
Molecular Weight:   26.04 lb/mol
Specific Volume at 70F and 1 atm:   14.76 ft3/lb (0.918 m3/kg)
Specific Heat:   10.53 BTU/lbmol-deg F@ 70 deg. F
Specific Gravity: .920 
Gas Density:   0677 lb/ ft3 @ 70 deg. F. 14.7 PSIA
Psat:   586.2 psia @ 70 deg F
Liquid Density:   23.61 lb/ ft3 @ 70 deg F
 

Boiling Point

Temperature:        -120.6 deg. F ( deg. C)
Liquid Density:     38.4 lb./ft3
Latent Heat:    (none)
 

Critical Point

 Temperature:       95.36 deg. F
Pressure:   897.8 PSIA
 

Melting Point

Temperature:       -113.0 deg. F
Pressure:   18.5 PSIA
   

Industrial Cylinders

PART NUMBER

CYLINDER SIZE

APPROX. WT. OF FULL CYL. (LBS)

PRESSURE
(PSI @ 70F)

DIMENSIONS
(Height x Diameter)

ACEMC

10 ft3

8

250

15" x 4"

ACEB

40 ft3

25

250

23" x 6-1/2"

ACES

approx.
147 ft3

83

250

38" x 8"

ACEL

approx.
325 ft3

189

250

45" x 12"

 

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