Always use the proper size tip for the job! Never use an oversized tip and then cut the fuel and oxygen back to work on a small job. This will starve the tip of oxygen and acetylene resulting in improper operating pressure that may cause tip damage, overheating, backfire and flashback. The following is a good example of the proper procedure for lighting an oxyacetylene tip. This safety tip is not a substitute for carefully reading the manufacturer’s operating instructions. Read the manufacturer’s instructions before use.
Step 1: Prior to opening the cylinder valve, make sure the regulator pressure adjusting screw is backed all the way out by turning it counterclockwise until it stops. When opening or closing the cylinder valve, always stand to the side of the cylinder with the regulator facing forward, The oxygen cylinder valve should be “cracked” opened slowly until the cylinder contents gauge stops moving. Then opened sufficiently to provide adequate flow. The fuel gas (acetylene) cylinder valve should be opened a maximum of 3¦4 turn and a wrench should remain in position on the stem of the valve while the cylinder is in use so that the valve can be quickly turned off in case of an emergency.
Step 2: After the proper tip has been selected and installed, the proper operating pressure needs to be determined
from the manufacturer’s tip chart. Set each regulator to its corresponding pressure by adjusting the pressure adjusting screw. Purge hoses and equipment by briefly opening and closing oxygen valve and fuel gas valve separately and
venting gases safely. Purge hoses and equipment before each use.
Step 3: To light the tip, open fuel gas (acetylene) valve about 1¦2 turn and quickly ignite with a spark lighter. Adjust the flame so that it is not separated from the tip end. The flame should be a bright yellow with no smoke.(3a) If necessary, increase the fuel to clear the smoke. Now, open the oxygen and adjust the flow until the white
feathers disappear into a well-defined bullet nose cone called a neutral flame.(3b)
Step 4: When you have completed the job and are ready to shut off the torch, first shut off the oxygen valve and then the fuel gas (acetylene). Note: Shutting off the fuel gas first can cause backfire and/or flashback!
Step 5: To shut down the torch for storage or transportation, close the cylinder valves. Release the oxygen pressure by opening the oxygen torch valve (vent safely). Close the torch valve once the oxygen has been released; then shut off the regulator by turning the pressure adjusting screw counterclockwise until it is all the way out with no spring tension.
Repeat this same process for the fuel gas (vent safely). Close all valves tightly and secure the equipment. Now the shutdown is complete!
Safety first: Shade #5 tinted goggles, heavy duty welding/cutting gloves and protective clothing should always be used.