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Tool Talk Discussion Forum

Propane Gas Line (In a Building)

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Arkandan

03-18-2008 16:35:01




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I was leafing through a plumbing "how to" book yesterday and happend onto a page dealing with gas line supply. It indicated that the line should be installed with a pitch going downhill as it approaches the appliance (furnace, water heater, etc.). Doesn't say how much of a pitch or why there should be a pitch. I'm a bit perturbered as I put my line (about 50' of 1" black pipe + some �" and �" legs) in about a month or so back and was careful to keep it level and looking neat. Anyone got some input on this and am I going to have to do a makeover? It seems to work fine as it is, but if there is a safety concern or something else that is looming in the future that is going to bite me in the butt I'll have to redo it. Thanx for any revelations.

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reply

03-19-2008 16:33:47




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 Re: Propane Gas Line (In a Building) in reply to Arkandan, 03-18-2008 16:35:01  
I installed my lines the same as you installed yours. Passed inspection , and working very well for 8 years now. No need to pitch them that I know of.



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jdemaris

03-19-2008 08:22:23




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 Re: Propane Gas Line (In a Building) in reply to Arkandan, 03-18-2008 16:35:01  
In my area of New York, the code department requires metal pipe - gal. or black anywhere it passes through a wall or where it is exposed and can be hit. At every appliance, a dirt/moisture trap must be installed - which is just a short piece of pipe runing vertically down with a cap on it. Nothing was said or required about any pitch for any of the pipes.

I recently installed a 1000 gallon tank 300' from my house, a high pressure reg. at the tank, and several low pressure regs. at the house with all new piping - and all got inspected.

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Bus Driver

03-19-2008 04:42:33




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 Re: Propane Gas Line (In a Building) in reply to Arkandan, 03-18-2008 16:35:01  
The question was asked about what often is called the "dirt leg". At one time, gas piping was black iron. The dirt leg would hopefully catch any rust particles flaked off inside the pipe or dirt that was in the pipe before or during installation. Galvanized pipe is not to be used for fuel gas piping.



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T_Bone

03-19-2008 07:37:41




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 Re: Propane Gas Line (In a Building) in reply to Bus Driver, 03-19-2008 04:42:33  
Hi BD,

About 91' or 92' (always liked saying that as it sounds like were really old...LOL) they changed the AGA code to allow galvanized for gas piping. This is the year that they switched over too electroplated pipe from hot dipped galvanized pipe so the glavanize will no longer flake off into the gas valves.

I have not had the time too research the new codes so I don't know why code would require a pitched line other than for drainage. Makes me wonder if they elimitated the drip leg requirement. Now that would be stupid, so I don't think they did that.

I do know that my RV LP hose got a vaseline plug in it one hot AZ summer in a "U" bend off the cylinders below the regulator. I had to take the air hose and blow the plug out as it had the line completely blocked. About 2" long grease plug came flying out and splat on the side of my pick-up :<(

T_Bone

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john nelson

03-18-2008 18:47:40




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 Re: Propane Gas Line (In a Building) in reply to Arkandan, 03-18-2008 16:35:01  
In the old days gas wasn't near as good as it is today. It was a mixture of whatever came out of the wellhead, drip gas, some butane, propane, methane ect. There was usually a "drip Loop" to catch the liquids. Now gas is closely regulated and tested. Before scent was added many fires and explosions occoured. Do you remember gas burning different colors when you were young? Remember most heating stoves weren't vented so the combustion products went into the room. Floor furnaces were the worst, water would flood them, or at least rust and rodents plug everhthing up. Before gas safty valves were used, first in floor furnaces, and adding scent, it was recomended to keep pet birds. Many towns and cities had their own gas, and electric plants. John

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Arkandan

03-19-2008 07:19:57




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 Re: Propane Gas Line (In a Building) in reply to john nelson, 03-18-2008 18:47:40  
I can appreciate your skepticism and am not the least bit offended by it. It is in reference to gas line piping though. The "how to" book is an Ortho Book titled "Basic Plumbing Techniques" volume #0-89721-250-9. On pages 68 & 69 it discusses the the procedure of "Installing A Gas Line". It indicates that the line should be pitched toward the appliance with a "drip leg" at the end of each horizontal run (which I have). It also states that unions should not be used in the line, only left-right nipples and couplings. I've got three or four unions in my line. It says to not have a valve in the middle of the run, only on the ends. I've got one at the tank, at the regulator outside the house and one just as it comes into the house plus the valves at the ends of the lines for the perspective appliances. I'm not subject to any code here, only my own. The pipe was sized by the fellow who sold me the furnace. He had been in the industry before going into HVAC and had his charts and figures still with him. The line was pressurized at 80-PSI prior to being connected and held that pressure for three days with out any noticeable drop. I'm concerned about safety fo my family and me and anyone else who may end up with this house down the line. My furnace got connected and nothing was said other than "nice looking job". I think T-Bone mentioned a while back that galvanized was suitable for gas now due to the new process used. Anyone else see that?

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T_Bone

03-19-2008 07:54:52




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 Re: Propane Gas Line (In a Building) in reply to Arkandan, 03-19-2008 07:19:57  
Hi Dan,

Dan I've never seen a buillding code that was wrong. It may well take us a few years to think about why they wrote the code the way they did but it will never be wrong. Them boys are some sharp cookies and there's not just one, sometimes upward of 200 people reviewing building codes, all very well respected engineers in there field!

Follow AGA code when installing gas appliances and releated piping.

You have some safety issues in your piping system from your post. Follow the codes! It's for your familys safety.

"I've got three or four unions in my line."

"one just as it comes into the house plus the valves "

"The line was pressurized at 80-PSI...with out any noticeable drop"

As I've stated before, gas piping via the internet will surely get some killed!!!

T_Bone

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loveshisallis

03-18-2008 17:47:32




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 Re: Propane Gas Line (In a Building) in reply to Arkandan, 03-18-2008 16:35:01  
Hi;

Not to get fresh but are you sure they were not talking about the waste line? I put in lines and only know that the trap is important. Course, if a guy installed it with a pitch it wouldn;"t hurt anything.
Feel good about your job. it sounds good and will last forever.



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Bob Bancroft

03-18-2008 17:13:59




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 Re: Propane Gas Line (In a Building) in reply to Arkandan, 03-18-2008 16:35:01  
First-I am no expert-have only my own system to go by. I have one 1000 gal propane tank that supplies everything from the corn dryer to the shop to the house to the out building behind the house. I have underground yellow plastic gas line, underground copper liquid and vapor, copper tubing inside and of course black iron in the house. As you might imagine, it runs every conceivable direction. It works fine. I notice professionals always put a trap just before an appliance. If you do that I think you'll be fine. I have never found anything in a trap. I would be interested to hear a pros` advice on that.

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Gun guru

03-18-2008 17:01:02




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 Re: Propane Gas Line (In a Building) in reply to Arkandan, 03-18-2008 16:35:01  
I didnt know that there should be a pitch to gas line, only a drip leg at the appliance to catch the small amount of debris and residue from the gas/propane. Maybe the pitch is to allow residue to slowly make its way to the drip leg, Maybe somebody else can fill us in on this.



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