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Torches handles
4.2.- SAFETY OF THE EQUIPMENT
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Check the state of the conduction hoses as well as their connections and connectors before being
connected for use. They must be free from oil and grease and without dents, cuts and burns.
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Check the correct state of the conduction, adjustment and safety elements of the gas installation.
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Always use safety valves against flame and gas flashback.
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Keep any equipment or objects, which may be damaged or cause fire or explosions due to the
sparks produced by the torch, far away from the working area.
4.3-. RECOMMENDATIONS FOR AVOIDING FLASHBACKS
The flashback effect occurs when for some reason the flame enters the torch nozzle, producing a
clapping noise similar to a gunshot. The flame may go out at that time or go inter the torch, destroying it
by heat if action is not quickly taken.
The reasons for possible flashbacks are:
- Incorrect place for mixing the gases.
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Unsuitable gas pressures.
Either of these two reasons may be caused by:
1. Incorrect use of gas pressures in the pressure regulators.
2. Obstruction or dirt in the nozzle tips producing gas pressure variations.
3. Tightening nut of the cutting nozzle tips not tight enough meaning the nozzle fits badly and the gas
does not enter correctly.
4. Bad coupling of the nozzles in the handle as they are not tight enough or the O-rings are
deteriorated.
5. Lighting the torch with the cocks open.
6. Drowning the flame on the fused material by cutting or welding. It may be difficult for the flame to
stay alive and therefore the gases loose speed, giving rise to the flashback.
7. Excessive heating of the nozzle tip due to hard work or bad state of the nozzle tip. This gives rise to a
change of the balance between the inflammation speed and the supply speed.
"IN ORDER FOR FLASHBACKS NOT TO OCCUR PREVENT THE REASONS
!
GIVEN ABOVE FROM APPEARING".
WARNING: "IT IS ESSENTIAL TO USE SAFETY VALVES AGAINST
!
FLAME FLASHBACKS AND BACKFLOW".
4.4.- WHAT TO DO IN THE CASE OF FLASHBACKS
One knows when a flashback has occured if the flame disappears from the nozzle tip and a bang is
heard similar to a gun-shot. If the gas combustion continues inside the torch a typical whistling sound is
heard and the area where the flame has stopped starts to overheat.
In any case, the following must be quickly done:
1. DO NOT LEAVE A TORCH WITH FLASHBACK OR THROW IT ONTO THE FLOOR.
2. DO NOT MOVE OR KNOCK THE TORCH TO TRY TO PUT THE FLASHBACK OUT, THIS
COULD CAUSE GREATER DAMAGE.
3. IMMEDIATELY TURN OFF THE TORCH OXYGEN ADJUSTMENT COCK.
Gala Gar, S.L. c/ Jaime Ferrán, 19 (Políg. Cogullada) | Tel.: (+34) 976 47 34 10 - 50014 ZARAGOZA |
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