Flashback arrestors are a good idea for ACETYLENE tanks because acetylene can explode BY ITSELF as it is an explosive. THAT'S IT.
Propane, butane, hydrogen, methane etc MUST HAVE AIR PRESENT TO BURN/EXPLODE. There is no air inside commercially filled gas cylinders. The filling process purges them and air cannot flow into them.
If someone is telling you different they a need an education.
There are thousands of pictures and clips on the net of Hot air Balloon burners all running on direct feed from propane tanks. IT IS OK.
Can my propane tank explode? Do I need flash back arrestors?
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