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Welding Gasses

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 70°F 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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