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Old 2022-01-05, 10:51am
rcktscientist rcktscientist is offline
Join Date: Jun 19, 2021
Location: los angeles
Posts: 71

The flashback debate for surface mix torches is alive and well if you want to look into it.

For me, I only use a flashback on the propane side of my auxiliary line for my PRE-MIX hand torch. I accept the risk since I understand it. Yes, surface mix can flashback but good luck finding reliable examples. But there are plenty of examples of PRE-MIX torches flashing back and burning inside the torch. No flashback on oxy since I use oxycons but if you're on tanked O2, use them on both lines.

Also, you can use an acetylene reg for propane. I have seen this running at lower pressures (less than 20psi) in many shops for many years. Prop reg for acetylene is the risky one.
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