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Old 11-21-2014, 12:28 PM   #1
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LP Flex Line Inside the Airstream?

Hello.

I recently replaced my refrigerator and the old copper tubing for the LP is way too long for my new gas connection.

Local propane store sells both metal and rubber flex lines. This would make my connection very simple

Any thoughts on using either one of these?
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Old 11-21-2014, 12:48 PM   #2
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Hello.

I recently replaced my refrigerator and the old copper tubing for the LP is way too long for my new gas connection.

Local propane store sells both metal and rubber flex lines. This would make my connection very simple

Any thoughts on using either one of these?
If memory serves, RVIA standards call for all propane connections in copper to be double flared. It also calls for no joints inside the trailer except for the final joint between the propane line and the appliance (you can hook the line attached to the appliance to the line attached to the trailer, but no third piece of tubing in between.

My memory might be faulty on this, but I don't think so.

If the existing copper line is too long, you don't need a new one at all. You just need to cut the existing one to fit, and put a new double-flare connector on the new end.
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Old 11-21-2014, 12:51 PM   #3
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Rubber would be better than a metal flex line. But it will deteriorate in time. Copper is by far the best.
If you use rubber. Change it out every 5 years or so. Make sure it doesn't contact any sharp edges.


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Old 11-21-2014, 01:13 PM   #4
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The general yellow flexible lines used for final connection in homes are not legal in RV's. They flex too much and will crack over time with road vibrations.

Shorten your existing copper gas line. BTW, I have never heard that double flare connections are required in RV's and have never seen them used or made them myself on repairs, although all my experience is with older rigs. I have not had any of the gas connections on my 2014 FC 20 apart to see if they are double flair ones though.
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Old 11-21-2014, 01:18 PM   #5
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They make copper flex line that is flared on both ends and I think that is what they are wanting to sell you. I don't like the idea of rubber. There is virtually no pressure on gas lines down stream of the regulator. The main concern is that the tubing does not crack or fall apart due to age. The best way to do this would be to make a new line from the T under the bottom of the trailer up to the connection on the gas valve. The line would be flared at both ends. The copper flex line would be the next best thing.

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Old 11-21-2014, 01:28 PM   #6
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Shorten your existing copper gas line. BTW, I have never heard that double flare connections are required in RV's and have never seen them used or made them myself on repairs, although all my experience is with older rigs. I have not had any of the gas connections on my 2014 FC 20 apart to see if they are double flair ones though.
I knew I had seen it somewhere, so a bit of searching was in order to verify it. Check out Lewster's posts on this thread: http://www.airforums.com/forums/f287...elp-71184.html

He seems pretty adamant about it in that thread, and I've learned to trust Lewster when it comes to RV repair. That's how he makes his living!
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Old 11-21-2014, 02:08 PM   #7
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Thanks guys.

I kinda figured you were all gonna say that.

So how do you cut and flare the existing soft copper line down to fit properly? Is this a fitting I can buy at my local propane dealer?
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Old 11-21-2014, 04:25 PM   #8
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Thanks guys.
So how do you cut and flare the existing soft copper line down to fit properly? Is this a fitting I can buy at my local propane dealer?
You can buy the tools and the fitting at your neighborhood home improvement or hardware store. The skill to use them requires practice, more so the flare tool than the tube cutter. You might be better off finding a mobile RV technician or propane tech to do the job.

If you choose to do it yourself, get hold of some extra copper tubing and keep practicing until you can make a perfect flare. This is your life we're talking about.
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Old 11-21-2014, 04:55 PM   #9
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Don't all propane tanks on RV's connect via a rubber hose? The lines into the regulator (high pressure) as well as the line out of the regulator (low pressure).
If you have a grill. It connects via a rubber hose.
If the hose is rated for propane, there should not be a problem.



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Old 11-21-2014, 05:26 PM   #10
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Don't all propane tanks on RV's connect via a rubber hose? The lines into the regulator (high pressure) as well as the line out of the regulator (low pressure).
If you have a grill. It connects via a rubber hose.
If the hose is rated for propane, there should not be a problem.



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From my understanding, they are exterior of the trailer so that is acceptable.
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Old 11-21-2014, 05:34 PM   #11
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If memory serves, RVIA standards call for all propane connections in copper to be double flared.


If the existing copper line is too long, you don't need a new one at all. You just need to cut the existing one to fit, and put a new double-flare connector on the new end.

I think you are right about the double flare, but I don't really understand why it would be needed. Maybe I misunderstand the purpose, but I thought it was normally used for high pressure applications - brake lines and other hydraulic applications.

Downstream of the propane regulator I think the normal pressure is only nominally something like 11 inches of water in the propane lines, less than
one half of one psi!

I didn't realize there were special double flare connectors - could well be though.

I have regular flaring and double flaring tools, and the double flare tool just sort of folds the flare back on itself so it becomes double thickness.

Bought the double flaring tool for working on car brake lines.

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Old 11-21-2014, 08:04 PM   #12
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Seems odd about the double flare. We don't use double flares at NASA and we deal with a lot more high pressure dangerous gasses than what is in an RV. I have heard of it being used on brake lines. We us AN fittings with 37 degree flares. Most of the stuff is stainless steel. I think the real world uses 45 degree flares. I may do every thing in stainless steel at some point from the bottles to the appliances. The copper stuff looks rather sloppy.


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Old 11-21-2014, 10:24 PM   #13
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Possibly the double flare is for the lines from the tank to the regulator only. That might make sense as the pressure there can go to over 300 psi. The low side of the regulator has a pressure of only 11" of water, less than half a psi.

Again, I have never seen double flare fittings on any propane low side system in any RV over the years.
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Old 11-21-2014, 11:26 PM   #14
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LP Flex Line Inside the Airstream?

I use the rubber hose from the shutoff to the fridge, because the fridge is moveable, and from the regulator at the tanks to the black pipe. I put a inside shutoff on the point where the black pipe ends and copper tubing goes to each device. (6 shutoff valves inside the trailer) That way you can shut off anything not being used. Everything that is mounted stationary gets single flared copper. Check the system with air pressure and soap before putting gas to it.


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