Comparison between Acetylene & LPG fuels for gas cutting operation


SL No.


LPG (Propane)


Highest flame temperature up to 3100 Deg C

Flame temperature up to 2800 Deg C


Flame speed up to 7.5 m/sec

Flame speed up to 3.3 m/sec


Most of the heat released is in inner cone

Most of the heat released is in outer cone


Higher flame GCV of inner cone (4500 kcal/M3)

Lower flame GCV of inner cone (2500 kcal/M3) as compared to acetylene


Stoichiometric air fuel ratio1.2:1 (Requires 2.5 to 3 Oxygen cylinders for burning one Acetylene cylinder)

Stoichiometric  air fuel ratio 4.3:1 (Requires 7 to 8 Oxygen cylinders for burning one LPG cylinder)


Can be used in gas welding, as acetylene when burning with air creates reducing zone that cleans the steel surface

Cannot be used in gas welding as it does not create reducing zone


Acetylene has Specific gravity 0.9 kg/m3, so if it leaks it will raise in air without harming much

Propane has Specific gravity 1.6 kg/m3, which is heavier than air. So if it leaks it will concentrate in deck level or any other closed/corner area


Acetylene requires less air for complete combustion

Propane requires more air for complete combustion, so there may be chances of formation of carbon monoxide (CO) in case of incomplete combustion. This incomplete combustion may result into poisoning of working area, as CO is poisonous gas


Can be used for cutting & welding applications in industry

Used only for domestic applications

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