MetFab - Air Products Welder's Handbook - Flipbook - Page 51
Lighting up
• Use a spark lighter to ignite the flame.
Matches or gas lighters shall not be used.
Neutral flame
2100C (3800F)
1260C (2300F)
Outer
envelope
Inner cone
3040-3300C
(5500-6000F)
• First open the fuel gas (red) torch valve
slowly and ignite the gas, increase to
reduce smoke if necessary.
• Next open the oxygen (blue) torch valve
slowly and adjust until a neutral flame is
achieved.
Oxidising flame
Outer envelope
(small and narrow)
• You are now ready to commence cutting.
In the unlikely event of a sustained back
fire/flashback, you must turn the oxygen
(blue) torch valve off first, followed by the
fuel (red) torch valve and then carefully
close both cylinder valves.
If using acetylene, carefully check the
cylinder with bare hands to identify any
heat spots. If localised heat is detected,
treat the cylinder as if it has been in a fire,
evacuate the area and then contact the
emergency services advising them of a
suspected acetylene fire incident.
Inner cone
(pointed)
Carburising (reducing) flame
Acetylene feather
Bright luminous
inner cone
Blue
envelope
47
