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Old 09-02-2006, 07:06 AM   #1
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LP main pipe underneath

My LP lines running under the trailer are snaking all over the shut off valves are very tight and should be replaced.

I was looking around at new trailers not airstreams just the run of the mill types.
They all use black pipe as the main run then branch off of that.
I think that would be safer road debris couldn’t damage it for example.

Has anyone done a retrofit like this?
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Old 09-02-2006, 07:24 AM   #2
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Black pipe? As in PVC pipe?
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Old 09-02-2006, 07:31 AM   #3
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Quote:
Originally Posted by overlander63
Black pipe? As in PVC pipe?
Nope Black Pipe as in residential style gas piping. IIRC it is soft iron.

Lipets,
I plan on going back with what was there orginally. It lasted over 30 years...works for me. I think that the soft iron pipe will break loose from the vibration and may rust out from road salt, etc.

Aaron
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Old 09-02-2006, 07:41 AM   #4
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Iron pipe slung under something that will shake and vibrate doesn't sound like a good plan. SOB's tend to last 5, maybe 10, years, so the longevity isn't a problem for them.
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Old 09-02-2006, 09:43 AM   #5
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Typically on most SOB's they have a fairly ridgid frame, and the pipe is up inside the frame. so it is less prone to vibration...sort of

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Old 09-02-2006, 11:07 AM   #6
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Stay with Copper

The copper is flexible, won't rust and will last a very long time. It's also very good at absorbing road vibration and frame flex and is far easier to repair if needed. If you are worried about road debris, wrap the copper tubing in a heavy guage vinyl wire loom to add additional protection.
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Old 09-02-2006, 12:22 PM   #7
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Ok, those are good points.

I'll stick with the copper, any hints on the reinstall?
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Old 09-02-2006, 01:41 PM   #8
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Quote:
Originally Posted by Lipets
Ok, those are good points.

I'll stick with the copper, any hints on the reinstall?
I plan on completely replacing the LP systems on both of my units. Plus installing at least one LP light...just because I plan on pretty much duplicating the existing system. However be forewarned that the current RV standard calls for double flared ends and fittings. I haven't done any research into it...yet. The older units like ours have single flare fittings. I would hope that the single flair nuts and hubs are still available.

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Old 09-02-2006, 03:58 PM   #9
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What is the proper way to go through the belly pan wood floor and to appliance.

Now I see a tiny valve, then copper which is downsized through the belly pan, but these holes are maybe 1" in diameter with no bushing or protection from chafe.

Shouldn't something be there and again through the floor.

Anyone have a pic or schematic of what the right way to do this is?

What size should the branches be to each appliance?
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Old 09-02-2006, 05:29 PM   #10
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Quote:
Originally Posted by Lipets
What is the proper way to go through the belly pan wood floor and to appliance.

Now I see a tiny valve, then copper which is downsized through the belly pan, but these holes are maybe 1" in diameter with no bushing or protection from chafe.

Shouldn't something be there and again through the floor.

Anyone have a pic or schematic of what the right way to do this is?

What size should the branches be to each appliance?
Lipets,
I would fill the holes with some expanding foam at the wooden floor, and a caulking at the belly pan, or a rubber donut if you can find the right size. You want the hole at the pan large enough that it doesn't wear on the pipe. I have attached a scan of the gas piping system for a 76 Sovereign. If it isn't the right one for your trailer let me know. It tells you what size pipe to use where.

Aaron
Attached Files
File Type: pdf Gas Line Scan.pdf (48.9 KB, 113 views)
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Old 09-02-2006, 05:41 PM   #11
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Aaron, thanks for input on this.

I think I've got if figured out pretty much now.

The only thing I think I want to change is placing the shutoff valves inside the cabinets instead of outside underneath.

All the new trailiers I see have no valves outside.
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Old 09-02-2006, 05:41 PM   #12
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Quote:
Originally Posted by wahoonc
I plan on completely replacing the LP systems on both of my units. Plus installing at least one LP light...just because I plan on pretty much duplicating the existing system. However be forewarned that the current RV standard calls for double flared ends and fittings. I haven't done any research into it...yet. The older units like ours have single flare fittings. I would hope that the single flair nuts and hubs are still available.

Aaron
Aaron,

A double flair is the same dimension as a single flair and they both fit any currently available flair nut. A double flair simply has another layer of copper tucked inside of the outer flair, allowing it to have a little extra cushion when sealing into the flair nipple.

Just be sure that you put the flair nut onto the tube, threads facing OUT......................BEFORE you make your flair and don't over tighten them!

Also, you can get a nylon pipe clamp from most plumbing supply houses that will wrap around the tubing and then get secured by screws to the floor to seal the opening and secure the tubing.
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Old 09-02-2006, 05:51 PM   #13
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Quote:
Originally Posted by Lipets
Aaron, thanks for input on this.

I think I've got if figured out pretty much now.

The only thing I think I want to change is placing the shutoff valves inside the cabinets instead of outside underneath.

All the new trailiers I see have no valves outside.
Actually with the new OPD valves, shut offs are more of a convinence rather than a necessity (I think) I will probably put my shut off valves outside, easier to find and get to.

Lewster....been there done that! My favorite trick used to be flare the pipe, then remember the fitting! I don't mind working with copper pipe at all. Must come from all those years of "vintage" home ownership

Aaron
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Old 09-02-2006, 09:27 PM   #14
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To fill the hole around the pipe use "duct seal" or "divers putty". It is a flexable stickie glob that is made to seal small voids. I found mine at an electrical suply house. It goes by different names but usualy if you tell them you need a sticky glob they will chuckle and go get it. I always keep a little on hand just in case duct tape want work.
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