I've read it before and it's got some cracking info in there. One of my favourite bits was him using propane as a purge gas to get better quality brazed joints, though interestingly he baulks at the idea of using propane as a refrigerant gas!
No the brazing sounds dangerous. How does it not ignite?? Brazing is done with high heat open flame. Unless it's just for back purging? But that sounds even more dangerous - intentionally building up a propane resivoir behind the braze.
Probably because you need sufficient oxygen for combustion. The propane would only ignite where it comes out and mixes. Once the flame travels into the purged pipe it will probably die out for lack of oxygen.
Ticklish though I'm sure to do it properly and safely.
Propane is not an explosive. Environmental concerns aside, millions of people burn propane each day all over the world relatively safely, explosion isn't really the leading concern.
You may be thinking of acetylene. But that isn't really that dangerous in modern usage either.
Where is the propane going when used as a purge? If it stays in the pipe, you may create an explosive mixture. If it doesn't stay in the pipe, you might create a fireball in your face.
