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Old 11-04-2010, 07:59 PM   #15
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Double flaring on copper gas pipe is a resent idea of the "Do Gooders" and unless you are dealing with a newer trailer that someone might question it on resale I can not see no reason to double flare. 100 of thousands of trailers were made with single flaring.

Double flaring is common on hydraulic brake lines because of the line pressure. Gas is only at 11 in. of water column.
With all due respects Howie, do you really think that the RVIA, the industry organization that 'writes the standards' for all RV manufacturers, would tell their paying members to include an extra step in the assembly of their units (which adds to their costs) if there wasn't a VERY GOOD REASON to do so?

Double flairs make a better, stronger, more durable seal than a single flair with minimal chance of leaking. They also have a bit of a 'forgiving' factor incase you happen to tighten the flair a bit off center.

Choose what you want, but a written standard exists and it is the double flair for all LP connections when using copper!
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Old 11-05-2010, 02:49 PM   #16
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double flairing?? Lot's of head scratching going on...

I spoke with someone locally that is thrid generation owner of a propane fuel company with a great reputation. they sell fuel as well as install and service propane fuel systems for decades. I asked him about the double flare and he never has heard of having to double flare. I assume it does mean it's a recent change to regulation or specific to the RV industry? He isn't familiar with it. He is one of many people that are scratching their head when I mentioned the double flare. Someone please clarify for me. thanks.
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Old 11-05-2010, 03:18 PM   #17
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I'll tell you from experience that double flares are A LOT harder to make than single flares, and you'd better get a high quality flaring tool.

Worth the effort though in my opinion. RVIA makes the rules.
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Old 11-05-2010, 03:50 PM   #18
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Must be my double flare set. I don't think that they are much harder to make at all.

I've done more steel double flares, brake lines, oil lines, and fuel lines than copper. Copper is much easier to work with than steel though.
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Old 11-05-2010, 04:03 PM   #19
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I spoke with someone locally that is thrid generation owner of a propane fuel company with a great reputation. they sell fuel as well as install and service propane fuel systems for decades. I asked him about the double flare and he never has heard of having to double flare. I assume it does mean it's a recent change to regulation or specific to the RV industry? He isn't familiar with it. He is one of many people that are scratching their head when I mentioned the double flare. Someone please clarify for me. thanks.
I'm sure that they are used to working on houses that don't rumble and vibrate down the road. I'm sure he is also NOT versed in the industry standards for RV's and is NOT RVIA certified in LP systems for RVs.

Look at it this way; DO WHAT YOU WANT! I really don't care if you use single, double or triple flairs on YOUR LP system.

I know what the RV industry code is and that's what I use and follow. It's your trailer and your safety, NOT MINE! The issue becomes one of standards and safety, which is why I post it here. Again, this is a free country and an individual can set up their LP system any way they choose. I have even seen LP lines run with re-inforced WATER TUBING....and they wondered why they had a leak!

I do things one way...........BY THE BOOK! You will have no liability issues other than to yourself and maybe the lawyers that sue you if your trailer blows up and you injure someone else and your LP system was sub-standard. Liability and safety are BIG ISSUES with me!
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Old 11-06-2010, 12:14 AM   #20
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double tool

I would like to follow the recommended RV standards of double flair. Is this double flare tool available at the big box stores Home Depot Lowes, etc,. or is it a specialty plumbing store product?
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Old 11-06-2010, 08:06 AM   #21
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I would like to follow the recommended RV standards of double flair. Is this double flare tool available at the big box stores Home Depot Lowes, etc,. or is it a specialty plumbing store product?
Believe it or not, you can actually get a decent double double flair tool at Harbor Freight. There are some very expensive models out there that run into the hundreds but for the occasional user, the HF tool will work just fine.

One thing to look for is the way the clamp halves lines up. Be sure that the half circles form a perfect circle when the clamp is closed. If you get one that is off-round...... return it for a good one.
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Old 11-06-2010, 09:14 AM   #22
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I have a question for Lewster. Post 19 says you've seen LP lines run with reinforced WATER TUBING. Do you mean they used the wrong copper tubing or were the run inside a protective plastic flexible tubing? My MH has the plastic over the copper & I was thinking about doing this in my Tradewind.

Ricky
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Old 11-06-2010, 01:08 PM   #23
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I have a question for Lewster. Post 19 says you've seen LP lines run with reinforced WATER TUBING. Do you mean they used the wrong copper tubing or were the run inside a protective plastic flexible tubing? My MH has the plastic over the copper & I was thinking about doing this in my Tradewind.

Ricky
NO. Some moron actually used nylon re-inforced water tubing ONLY with barb fittings and hose clamps for the LP lines. No copper, no black pipe, no LP specific rubber hose with flair ends .....just the stuff you can buy at the hardware store. WHAT A MORON!!!!!

The plastic on the outside of your copper is an extra layer of protection. It is a real PIA to slide the copper inside the tubing. I usually see nylon split loom (like the stuff used in wiring) used as an extra protective layer.
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