Propane Piping ?

Well, in my rig it's black iron. The store clerk in Canadian Home Depot was also 100% positive that galvanized is not to be used in natural gas lines (they don't know anything about propane).

I am not sure whether black iron is better or worse than galvanized. After my trailer survived a little flood in Mexico and wet mud came up to the level of plastic sheets covering the belly - the black iron Tee corroded on one side, where it was closer to flood waters. I've sanded the rust out and painted it with Rustoleum. So, from my point of view, black iron does need some protection on the outside, and galvanized coating provides such a protection.

Per NAPA 58:
Pipe shall be wrought iron or steel (black or galvanized), brass, copper, or polyethylene (see 3-2.10.8) and shall comply with the following: (a) Wrought-iron pipe — ASME B36.10M, Welded and Seamless Wrought Steel Pipe (b) Steel pipe — ASTM A53, Specification for Pipe, Steel, Black and Hot-Dipped, Zinc-Coated Welded and Seamless (c) Steel pipe — ASTM A106, Specification for Seamless Carbon Steel Pipe for High-Temperature Service (d) Brass pipe — ASTM B43, Specification for Seamless Red Brass Pipe, Standard Sizes (e) Copper pipe — ASTM B42, Specification for Seamless Copper Pipe, Standard Sizes (f) Polyethylene pipe — ASTM D2513, Specification for Thermoplastic Gas Pressure Pipe, Tubing and Fittings. Pipe shall be recommended by the manufacturer for use with LPGas. Polyethylene pipe shall be marked in full compliance with the product marking requirements of ASTM D2513, and shall include the manufacturer’s name or trademark, the standard dimensional ratio of the pipe, the size of the pipe, the designation polyethylene (PE), the date manufactured, and the designation ASTM D2513

John&Joey wrote:
You all know that the probability is very high that the line is simply feeding a gas grill don't you? Yes it should be black pipe, but let's get real about how bad it is...

I don't see a grill. I see a 20# external propane tank. Going back to the first post in this thread you'll see that the top (capped) port is the grill port.

It's a seamless galvanized elbow. This is being used with propane, NOT natural gas. I don't know where the mobile RV tech obtained it in 2011, but he said that a seamless elbow of this nature was accepted for this application. I have had zero issues with it since.

You all know that the probability is very high that the line is simply feeding a gas grill don't you? Yes it should be black pipe, but let's get real about how bad it is...

whiteeye42 wrote:
... Galvanized is for water only

Galvanized is ok for cold water lines up to 15 years or so, marginal for hot water lines up to 10 years or so and pitiful for water drain lines. Galvanized pipe used in a water drain will rust thru amazingly fast after the galvanized coating is gone, i.e. see the one the previous owner used in our house.

Chris Bryant wrote:
From NFPA 1192 "Standard on Recreation Vehicles" 2011 edition:

NFPA wrote:
Fittings for propane shall be wrought-iron, malleable iron, steel, or brass (containing less than 75% copper).

Thanks, ends debate on that IMO

I've got a 2008 copy. Anybody know where a newer copy of NFPA 1192 "Standard on Recreation Vehicles" in pdf form and most importantly free?

Thanks

From NFPA 1192 "Standard on Recreation Vehicles" 2011 edition:

NFPA wrote:
Fittings for propane shall be wrought-iron, malleable iron, steel, or brass (containing less than 75% copper).

Now my head is spinning....:?

No you can not use Galvanized pipe in the gas line it has to be either black pipe or stainless Galvanized is for water only

gatorcq wrote:
have to use BLACK pipe

Makes no sense, the rest of the fittings are brass and where are you going to find a "black pipe" valve for the tank.
Earlier someone said "Plumbers interconnect brass, galvanized and black pipe all the time." The brass valves probably have stainless balls in them and hot water tank flex lines are made of copper or stainless. The main manifold in our trailer is black pipe and all the connections to the appliances are copper tubing. Of the choices galvanized is the poorest.