On Sun, 18 Dec 2016 07:23:38 -0800 (PST),
wrote:

I am in Brazil now and here they use cooper pipe for gas lines in buildings, if to repair a leak, how to do a repair, i hearded you need to run nitrogen gas before solder or brazing because the gas fumes.
Don't know about Brazil but soldering gas line in Canada is
forbidden. Must be brazed. Same with refrigreration lines.
You DEFINITELY want the lines purged - well purged - before applying a
flame!!