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Old 04-13-2010, 02:42 PM   #1
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What size line to run for LP?

I am redoing all the lp lines in our jewel trailer and I am unsure of what sized lines to run, the existing HW heater that was electric only is being replaced by a propane heater. The only appliances in the trailer that are propane are the stove/oven, panel ray heater, hot water heater and a propane light. I was planning on running everything 1/4 type k tubing, but now I am not sure if I should have the main line in 3/8"s and branch off in 1/4 to each fixture. I am just worried about under-sizing the system.

Thanks
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Old 04-13-2010, 02:52 PM   #2
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Most trailers have 3/4 line coming off the tanks and branching off with 3/8 to stove, water heater, and refg. 1/4 seams a bit small. I ran 3/8 to my small Olympic heater.
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Old 04-13-2010, 04:18 PM   #3
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That sounds about right, It just seems weird all the original lines were 1/4 from the regulator back. Mybe a 1/2" main and 3/8" branches might be better.
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Old 04-13-2010, 05:21 PM   #4
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Most trailers I've seen start with a 5/8" line to a junction, then 3/8" from there to each individual appliance. An exception would be, say, a gas lamp, which would be 1/4".
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Old 04-13-2010, 06:02 PM   #5
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OK we are doing gas, not air conditioning,Gas lamp takes 1/8 inch. water heater is 1/4 ",yes your flares are outside pipe sizes,but the pipe is ID. Plumber Dave
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Old 04-13-2010, 08:30 PM   #6
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Your original lines were as Terry mentions according to the early 70's diagram. 5/8 OD main line. 3/8 OD to oven, range, water heater and furnace. 1/4 OD to refrigerator and gas light.
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Old 04-29-2010, 08:23 AM   #7
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We replaced the furnace, fridge, and range in our '72 Argosy 20. (Terry's old trailer) Since we spent all that cash on new appliances, I felt it kinda important that we go ahead and run all new copper tubing - not a fun job. Our trailer has a 5/8" line coming off the regulator with 3/8" tees that feed runs to each appliance. In addition to the new tubing, I installed new gas cocks so each branch can be shut off independantly. The original configuration didn't include a shut off for the range! It was a bit of a challenge running the line for the new fridge, but that was the only difficult hurdle.

BTW - for those who have problems making a good flare connection, this tool from Yellow Jacket makes the job REAL simple. A little spendy compared to the models in the home centers, but worth the price of admission.
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Old 07-14-2010, 03:54 PM   #8
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I'am restoring a 62 bambi and are repairing a leak in my main line

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OK we are doing gas, not air conditioning,Gas lamp takes 1/8 inch. water heater is 1/4 ",yes your flares are outside pipe sizes,but the pipe is ID. Plumber Dave
1/2 is to big and 5/8 to small for the two flairing tools I have tried what gives!
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Old 07-26-2010, 08:04 PM   #9
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Here's the deal with propane line...

Propane line is measured in O.D. (outside diameter) Most trailers, including my Argosy 24, have a 5/8 OD (or 1/2 ID for plumbers) main line with 3/8 OD branching off to each appliance. In most cases that is fine. I have a water heater, range, furnace, and refrigerator all on propane on my trailer. The key to gas line sizing the is load on the system and the length of the run. If you are unsure about line sizing and how to install, please seek out a propane tech for help. Undersized line can be dangerous because if there is not enough pressure you will not get an efficient burn which can produce excess carbon monoxide. Also, the appliances will soot and can cause damage, especially in the furnace where you can't see it without taking it apart.

Hope that helps everyone.
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Old 07-27-2010, 08:10 AM   #10
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Propane size

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Originally Posted by lpgasguy View Post
Here's the deal with propane line...

Propane line is measured in O.D. (outside diameter) Most trailers, including my Argosy 24, have a 5/8 OD (or 1/2 ID for plumbers) main line with 3/8 OD branching off to each appliance. In most cases that is fine. I have a water heater, range, furnace, and refrigerator all on propane on my trailer. The key to gas line sizing the is load on the system and the length of the run. If you are unsure about line sizing and how to install, please seek out a propane tech for help. Undersized line can be dangerous because if there is not enough pressure you will not get an efficient burn which can produce excess carbon monoxide. Also, the appliances will soot and can cause damage, especially in the furnace where you can't see it without taking it apart.

Hope that helps everyone.
Don`t know where you are getting your info,it doesn`t really make much difference,but the National Fuel Gas code book refers to all sizes in I.D.,wouldn`t think a trailer would be any different. Dave
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Old 10-20-2010, 06:19 PM   #11
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FWIW, I just ran all new lines in my 65, Ran 1/2 rolled copper everywhere, but it did branch down to the original 3/8 inch for the Fridge and Water Heater. Pics on my page.
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Old 10-20-2010, 06:31 PM   #12
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Mine is 5/8 to 3/8.
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Old 04-02-2011, 07:17 AM   #13
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Looking to get agreement on the correct gasline standard

Quote:
Originally Posted by Ganglin View Post
Your original lines were as Terry mentions according to the early 70's diagram. 5/8 OD main line. 3/8 OD to oven, range, water heater and furnace. 1/4 OD to refrigerator and gas light.
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Originally Posted by lpgasguy View Post
Here's the deal with propane line...

Propane line is measured in O.D. (outside diameter) Most trailers, including my Argosy 24, have a 5/8 OD (or 1/2 ID for plumbers) main line with 3/8 OD branching off to each appliance.
Quote:
Originally Posted by easyride View Post
Don`t know where you are getting your info,it doesn`t really make much difference,but the National Fuel Gas code book refers to all sizes in I.D.,wouldn`t think a trailer would be any different. Dave
I'm wondering if we can all agree on what the size should be?

Does this sound right?

5/8" OD main line (including off the tanks?) and 3/8" OD after the regulator, going to each appliance

Or do we need to use ID measurements, and if so, what would they be?

Thanks. I am replacing my furnace this year, and did my water heater last year, and I want to make sure that I put the proper size in.

Thanks!
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Old 04-02-2011, 08:18 AM   #14
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Quote:
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5/8" OD main line (including off the tanks?) and 3/8" OD after the regulator, going to each appliance
This is what mine is.
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