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Old 11-20-2011, 07:16 AM   #1
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Need help w/propane plumbing

I am re-plumbing the propane lines in an old 19ft Traveler and need help with details. My plan is to a run 1/2 copper rigid main line down the center and T with soft 3/8 copper to each side. I will also cover the lines with some kind of flexible plastic tube or PVC pipe for protection. Does it matter what kind of copper pipe I use if it is covered? Type M, L, K?? What about single vs double flare?

The original trailer had all kinds of connections and shut offs inside the trailer which could be many potential sources for leaks. The main outside T to each side will supply two appliances on each side. The old system ran a soft line to each side with a T and shut off to each inside. Should the new T be inside or outside? Should I plumb in shut off valves for each appliance? If used, should these valves be inside or outside?

Thanks, Randy
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Old 11-20-2011, 09:27 AM   #2
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Type K soft copper for all the lines. Single flare will be fine. All valves and connections outside, under the rig. As few as possible connections inside the rig. Valves for each appliance are very nice.
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Old 11-20-2011, 11:34 AM   #3
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Great! Thks, That confirms my research. Randy
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Old 11-20-2011, 11:37 AM   #4
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Welcome to the airforums Rmiller51,

Sounds like a nice project your involved in there. We would love to see pictures of your idea once installed. My only thought would be the placement of those copper pipes in the pvc piping. I believe they are exposed for inspection purposes. If the connections were to ever leak you may not know and those pvc pipes could be filled with gas.

Cheers Vinnie
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Old 11-20-2011, 12:09 PM   #5
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Rather than a loose PVC pipe to cover the copper line, what do you think about using clear braided hose, slit along the length and zip tied for protection? This would be a tighter fit. Not sure if that would be the same kind of gas entrapment issue or not.
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Old 11-20-2011, 01:09 PM   #6
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Quote:
Originally Posted by idroba View Post
Type K soft copper for all the lines. Single flare will be fine. All valves and connections outside, under the rig. As few as possible connections inside the rig. Valves for each appliance are very nice.
Single flares may 'be fine' but they are NOT to current RVIA standards, which require DOUBLE FLARES at all flair fittings when used in LP applications. If you are going to do the job, DO IT RIGHT! A double flair takes a few seconds more to complete than a single one and has much better sealing properties.

Further, I would use rigid black pipe as the main line and branch from that with 'K-type' copper for the branch lines.
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