Brazing copper LP lines

Solid_Fuel_Man

Is it acceptable to braze copper (opposed to flare) propane lines? This would all be for 10 psi or less.

I believe NFPA states 1,000 degree F connections, which a braze would be. I've never seen it done, but curiosity has me. I suppose if you purge with nitrogen and treated the whole system like refrigeration.

Just for discussion, I'm not actually considering it!

GroundUp

Will depend on local codes, but here in MN we braze a large percentage of gas lines that are indoors. Always type L and always purged with nitrogen, like refrigeration.

EBEBRATT-Ed

MA allows brazed oil lines but not soldered and the same 1000deg applies. Never seen that done and never seen gas lines brazed but it may be legal

Leonard

Sounds easier to carry a lightweight hand flaring tool in than a heavy acetylene tank, even if it is a small "B" tank.

Unless you have metal scrapper BUMS that sheered the line off flush with cement wall,,,,,,,, had that happen with restaurant walkin coolers

Intplm.

It is ok to solder and braze in some parts . But! The thing to do is contact the local building official as they may not allow it in your area.

Jellis

Local code here requires brazing vs flare in enclosed spaces so yes it is "acceptable" but as others stated. check with your local AHJ

Solid_Fuel_Man

Thanks all, I would certainly consider a brazed joint superior to any mechanical flare.

Good discussion!

Big Ed_4

Just curious , I know the reason for refrigeration , carbon contamination from burnt oxygen , buy why nitrogen for a gas line ?

Solid_Fuel_Man

I'd think to avoid the flaking inside the pipe from oxidation. Those wouldn't be good for gas valves.