[scrubjaysnest]

Originally Posted by TM Pilot

What's your point?

Hard copper tubing that has been annealed (a process that makes hard copper flexible) is referred to as "soft copper" tubing in the industry. The PDF article I linked to above explains this on page 1. The flexible copper propane gas tubing used on the TM's are therefore rightly referred to as "soft copper." However, if you personally prefer the terms rigid instead of hard and flexible instead of soft - that's fine. But down at the hardware store, they distinguish copper tubing as either hard or soft. Thanks, but I don't think your comment has any relevance to this discussion.

If anyone is curious how copper tubing is manufactured, he is an article:
http://www.copper.org/publications/n...owdo_tube.html




Compression fittings can be used on soft copper tubing. But not in propane gas applications (especially the ones on wheels going 65mph over the potholes)! It's flare fittings or brazing only. No soldering either. Save the compression fittings and soldering for things like water applications when using soft copper tubing.

The Copper Tube Handbook http://www.columbiapipe.com/document...handbook1.aspx


As great as these forums are, please remember folks that there are some well intentioned people who will do the equivalent of recommending you install car parts on your Cessna 172. Be safe, please.

My point, after 20 years of working with tubing is the same as yours; better know what you are doing. Hard gas line copper tubing is very difficult to properly flare. This results in leaks; over torquing the nut to stop the leak and eventually cracked tubing.
The bottom line is if you work on the gas lines you had better know what you are doing. This is not a job for most of us.