Gas Lines - Page 2 - Fiberglass RV

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Old 05-18-2010, 10:51 AM   #15
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Trailer: Fiber Stream 1982 16 ft
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I agree that the residental flexible tubing will probably not stand up to the constant vibration that a trailer undergoes as it is being towed, aside from the fact that trailer manufacturers here are not allowed to use it.

In my unit, I had noticed some wear on the copper piping where it passed through the trailer floor, so I replaced it. One addition I have done to further protect the copper piping is to split an old garden hose and wrap it around the copper sections of piping under the trailer and up through the trailer floor.


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Old 05-23-2010, 10:43 AM   #16
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Trailer: 2015 Escape 19
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Reading through the NFPA 1192 guidelines for gas line materials it appears that the residential flexible line would be fine. Items (i) and (J) in the regulations below is what if I recall correctly the residential flex line is, steel tubing with a corrosive protective covering. Don't see anything in the piping material regs in 1192 (below) that would prohibit it's use or the the RVIA adopted standards for fuel line. That doesn't mean that there could be something in this mess that could prevent it's use somewhere, but I haven't specifically located a reg that prevents it's use.

I've used the flexible gas line on my Scamp for the run from the fridge to the propane tank and they've been in place for over two years, lots of miles and no visible wear or leak test failure. In fact I feel much more confident with the flex lines then the mess they replaced. If I were going to replace the entire internal gas line system of a larger trailer I wouldn't use the flex, but for a short run in the small trailers seems like it would be fine and it has stood up in the field. With gas systems I think the key is to always be vigilant, leak test regularly, and replace any parts that show wear.

NFPA 1192:

5.3.2 Gas Piping System Materials. Materials used for the installation, extension, alteration, or
repair of any gas piping system shall be new and free from defects
or internal obstructions. Inferior or defective materials in gas piping or fittings shall
be replaced and shall not be repaired. Inferior or defective materials shall not be used. The system shall be made of materials having a melting
point of not less than 1450F (788C), except as provided in 5.3.5
(2-4.5), 5.3.6 (2-4.6), and 5.3.12 (2-4.12), or of materials (used in
piping or fittings) listed for the specific use intended. Gas piping system materials shall be permitted to con sist of
one or more of the following materials:

{a} Gas pipe shall be steel or wrought-iron pipe complying with
ASTM A53, Specifications for Pipe, Steel, Black and Hot-Dipped,
Zinc-Coated Welded and Seamless.

{b} Threaded copper or brass pipe in iron pipe sizes shall be
permitted to be used.

{c} Fittings for gas piping shall be wrought iron, malleable iron,
steel, or brass (containing not more than 75 percent copper).

{d} Brass flare nuts shall be stress relieved or of the forged type.

{e} Copper tubing shall be annealed Type K or L, conforming
to ASTM B 88, Standard Specifications for Seamless Copper Water
Tube, or shall comply with ASTM B 280, Specifications for
Seamless Copper Tube for Air Conditioning and Refrigeration
Field Service.

{f} Where used on systems designed for natural gas, copper
tubing shall be internally tinned.

{g} Seamless brass tubing shall be composed of not more than
75 percent copper (cartridge brass 70 percent).

{h} Seamless brass tubing shall have a minimum thickness of
0.76 mm (0.030 in.).

{i} Steel tubing shall be constructed in accordance with ASTM
A 539, Standard Specifications for Electric-Resistance Welded
Coiled Steel Tubing for Gas and Fuel Oil Lines.

{j} Steel tubing shall be externally corrosion-protected.

{k} Flexible nonmetallic tubing or hose shall be either listed
and used with listed fittings or part of a listed assembly.

Scamp Owners International
2015 Escape 19 & 1997 Scamp 19
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Old 05-24-2010, 08:33 PM   #17
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I agree with Joe. don't mess with gas. the code here in Canada is you can only have one conection per appliance inside the trailer. I paid $250, had them all replaced and I feel great about it.
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Old 05-24-2010, 10:52 PM   #18
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Trailer: 84 16 ft Scamp
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I might be completely out to lunch but it seems like common sense is in short supply (and probably against the law too). After all, the pressure we are dealing with is less than 1 psi.

Garden variety air compressor hose is rated for 250 psi and is oil/gas resistant. It is also priced at about 20 bucks for a 50 ft length.

Anyhow. I know of someone ( not mentioning who) who upgraded his Scamp from the stiff, old, corroded copper to nice flexible rubber about ten years ago. He even installed a propane fireplace in his Scamp using the same method. His Scamp also rides on el cheapo p-metric tires. Poor fellow is obvious a driveling idiot to have done that but, you know, it's hard to argue with success. :>)

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Old 05-24-2010, 11:03 PM   #19
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Name: Dave
Trailer: 1973 Hunter Compact Jr; 1972 Astro (Havasu?)
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Well all the codes are meant for construction and industry to reduce liability and to keep fly-by-night operations out of the mix. What we choose to do with our personal property and lives . . .well, sometimes what works works just fine. We can do what we wish; just be careful with those wishes.
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Old 05-27-2010, 05:53 PM   #20
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Trailer: 1972 boler American and 1979 Trillium 4500
Posts: 4,957
I'm interested to know more about how Propane (C<sub>3</sub>H<sub>10</sub>) and copper (Cu) can make hydrogen sulphide (H<sub>2</sub>S). Is there some residual sulphur from the smelting process or some not refined out of the propane? That sounds not right from a chemistry standpoint.
Hydrogen sulphide (H<sub>2</sub>S) is a naturally occuring in natural gas and propane may be refine out of natural gas.

Propane has no color, taste or smell in its natural state. To warn users of a leak, propane is odorized with ethyl mercaptan (C2H6S), also known as ethanethiol.

My guess would be poor refinement in the first place or some reaction with the mercaptan.
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Old 09-09-2010, 09:37 PM   #21
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Name: Kevin
Trailer: 13' Scamp
Posts: 15
Propane line

Originally Posted by Don'n'Deb View Post
I used hose from Lowe's (intended to hook outdoor BBQ to NG) to replace to copper tube (wife recycled) in my Compact JR . Works just fine.
I was thinking about doing a similar thing. I don't have a line so I was going to drill a hole and route it behind the seat. Do you have a similar setup?

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Old 09-10-2010, 01:04 PM   #22
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Name: Donald & Debra
Trailer: Compact Jr 'RV There Yet'
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Originally Posted by kev_ev View Post
I was thinking about doing a similar thing. I don't have a line so I was going to drill a hole and route it behind the seat. Do you have a similar setup?

Kev, My line runs from front center , under left bench, to stove on left side; same route as copper tube.

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