Originally Posted by mary and bob
Gas training that I went to said to never use compression fittings. Not sure if it is a code issue or not. It's been a long time, 26 years or so, my memory may not recall everything from then but I do know for sure we never used compression fittings on any gas installation. If someone else wants to use them, have at it. My training was from Homgas in MA. By the way Floyd, we met a lady from your area in SC that owns a Scamp 13 that she pulls with a CRV. Can't remember her name but she spoke quite highly about you. A statement that is obviously true. I have seen people that aren't familiar with a flaring tool split the flare, thus my opinion that some things that are simple still require a little in person training rather than reading online opinions. There are times when paying an experienced professional are well worth the money. Another thing, we always checked for leaks
with a manometer, plus the soapy solution. A propane
leak can be a big liability, I'm happy to no longer work on it.
Thank you for the kind words!
I agree that it takes a little practice to master a single flaring tool. Same can be said for a double flaring tool. I too have heard that compression fittings are contraindicated but I just thought there might be some solid reason.
I can't tell you how many times I have found brass or SS compression fittings on brake lines (certainly another no-no),but I have never seen a failed one or heard a solid reason.
Still... brake lines with double flared ends and brake line couplings are cheap, maybe even cheaper than compression fittings.
All my life I have sought to know "how", but "why" has always been right alongside competing for my attention!
My only thought would be that the ferrule could cut or crack the line if over tightened. I have seen a couple of them fail in steam applications. Of course a flare can crack too.