dh wrote:Larry, I am running galvanized pipe under the trailer and up into the gally, and up front I have a POL directly into a single stage regulator, then it turns down with a hydraulic rated street elbow into a 24'' hose that mates with the hard plumbing in front of the tongue box. Any flaws there? I was told by a local RV guy and an orange vested man that galvanized was ok, but have recently heard differently.
Many years ago I worked for a wholesale plumbing house. I handled miles of both black iron and Galv. pipe. I asked the same question of the plumber customers, and was told several different things:
1) It was the code
2) It was to differentiate water and gas lines so a gas line was not accidentally cut
3) the same reason Madjack mentioned about flaking.
4) The odorante used in natural ( maybe propane?) gas has sulfur in it and corrodes the zinc in the galvanizing.
I have no idea if all or any of the above are true.
For the hose connection: Personally I would use a hose with at least one swivel connection on one end. It makes life easier. The POL is one swivel, but one on the other end is nice.
Why the hydraulic street elbow? They have NPTF threads.