The following oxyfuel welding safety precautions should be observed:

Do not experiment with torches or regulators in any way. Do not use oxygen regulators with acetylene cylinders. Do not use any lubricants on regulators or tanks.

Always use the proper tip or nozzle, and always operate it at the proper pressure for the particular work involved. This information should be taken from work sheets or tables supplied with the equipment.

When not in use, make sure the torch is not burning. Also, release the regulators, bleed the hoses, and tightly close the valves. Do not hang the torch with its hose on the regulator or cylinder valves.

Do not light a torch with a match or hot metal, or in a confined space. The explosive mixture of acetylene and oxygen might cause personal injury or property damage when ignited. Use friction lighters or stationary pilot flames.

When working in confined spaces, provide adequate ventilation for the dissipation of explosive gases that may be generated. For ventilation standards, please refer to Welding Health Protection and Ventilation.

Keep a clear space between the cylinder and the work so the cylinder valves can be reached easily and quickly.

Use cylinders in the order received. Store full and empty cylinders separately and mark the empty ones with “MT”.

Compressed gas cylinders owned by commercial companies will not be painted regulation Army olive drab.

Never use cylinders for rollers, supports, or any purpose other than that for which they are intended.

Always wear protective clothing suitable for welding or flame cutting.

Keep work area clean and free from hazardous materials. When flame cutting, sparks can travel 30 to 40 ft (9 to 12 m). Do not allow flare cut sparks to hit hoses, regulators, or cylinders.

Use oxygen and acetylene or other fuel gases with the appropriate torches and only for the purpose intended.

Treat regulators with respect. Do not turn valve handle using force.

Always use the following sequence and technique for lighting a torch:

(1) Open acetylene cylinder valve.

(2) Open acetylene torch valve 1/4 turn.

(3) Screw in acetylene regulator adjusting valve handle to working pressure.

(4) Turn off the acetylene torch valve (this will purge the acetylene line).

(5) Slowly open oxygen cylinder valve all the way.

(6) Open oxygen torch valve 1/4 turn.

(7) Screw in oxygen regulator screw to working pressure.

(8) Turn off oxygen torch valve (this will purge the oxygen line).

(9) Open acetylene torch valve 1/4 turn and light with spark lighter.


Use only friction type lighter or specially provided lighting device.

(10) Open oxygen torch valve 1/4 turn.

(11) Adjust to neutral flame.

Always use the following sequence and technique for shutting off a torch:

(1) Close acetylene torch valve first, then the oxygen valve.

(2) Close acetylene cylinder valve, then oxygen cylinder valve.

(3) Open torch acetylene and oxygen valves to release pressure in the regulator and hose.

(4) Back off regulator adjusting valve handle until no spring tension is left.

(5) Close torch valves.

Use mechanical exhaust at the point of welding when welding or cutting lead, cadmium, chromium, manganese, brass, bronze, zinc, or galvanized steel.

Do not weld or flame cut on containers that have held combustibles without taking special precautions.

Do not weld or flame cut into sealed container or compartment without providing vents and taking special precautions.

Do not weld or cut in a confined space without taking special precautions.