How to Prevent a Premix Torch from Popping

Popping is caused when the flow rate of the gas leaving the tip is slower than the flow rate of the flame burning its way back into the tip. Once the flame enters the tip, it can ignite the gas and oxygen within (the tip) in an uncontrolled manner, resulting in an explosion and a loud pop.  

If a torch pops, a flame may continue to bum inside the torch, although this situation is not likely (a light whistling noise indicates that this condition exists). To extinguish an internal flame, first turn off the gas and oxygen needle valves on the torch. Then turn the oxygen valve forcefully open for a moment and close it. Do 

Finally, relight the torch and continue. Although they are not necessarily common occurrences, experience will help you avoid pops.  

Because of the propensity for the premix torch to pop, there is a recommended procedure for shutting the torch off. Even if you are capable of controlling the gas flow so proficiently that you never pop your torch, this procedure is still recommended. 

Open the oxygen needle valve (CCW) fast and, just as fast, close the 

---