Gas line BTU and Price Estimate

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by jmcintosh, Sep 9, 2008.

  1. jmcintosh

    jmcintosh New Member

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    Sep 9, 2008
    Occupation:
    Network Engineer
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    Jxn, MS
    I am in need of two additional gas lines to be run after having my furnace being moved from the basement to the attic. The other line is for a new gas oven. The existing smaller diameter pipe will have to replaced with 1 1/4 inch diameter pipe and run all the back to the main outside the house. We have a conventional foundation with enough space to almost stand up straight. This is where all the pipe will be run.

    Will it deliver sufficient supply of gas pressure for both the oven and furnace? If the furnace kicks on while cooking, will I notice a difference in output on the oven burners? The oven has a single burner that will use 15K BTUs. The smaller burners use about 6K BTU. The Rheem Gas Furnace (RGPN07EAMGR) is 70,000 BTU. We have a water heater and gas logs that will be T'd off and fed before it gets to the oven and furnace. Is there an option to upgrade a gas main to your house for more throughput?

    Is an estimate for $732 pretty much in line? I know that there are too many variables to take into account so I was just wondering if its close to being the 'ballpark'. I like to do things myself but I am scared of gas.
     
  2. Gary Swart

    Gary Swart In the Trades

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    Sep 1, 2004
    Location:
    Yakima, WA
    I can't advise you on the pipe sizing etc., that's way too technical for me. I think you are wise not to attempt this yourself. As to the price, yes, there are many variables involved, but when you consider some plumbers charge more that that just to install a water heater, that sounds like a bargain price...in fact, it makes me wonder about the qualifications of the person who gave you the estimate. Make sure he is a licensed plumber with experience with gas installations. If all checks out, hire him.
     
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  4. GrumpyPlumber

    GrumpyPlumber Licensed Grump

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    Bearing in mind that the cost of living is higher where I am, that price seems very low.

    Make sure the guy is pulling permits and has license/liability insurance.
     
  5. jmcintosh

    jmcintosh New Member

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    new approach

    Good advice on the license and insuring.

    The guy who gave me a quote today says he can tie it into an existing pipe half-way and run 3/4 inch pipe instead of 1 & 1/4. Is there some kind of equation or formula to figure what length of pipe, and diameter of pipe for a certain numbers of BTUs?
     
  6. jimbo

    jimbo Plumber

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    Aug 31, 2004
    Location:
    San Diego, CA
    The charts are in the National Fuel Gas Code book.
     
  7. GrumpyPlumber

    GrumpyPlumber Licensed Grump

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    As a plumber, it would not bother me in the least if you wanted to see the chart from my gas code book.

    Ask him, I have no question he won't mind.
     
  8. MASTERPLUMB777

    MASTERPLUMB777 In the Trades

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    Retired Master Plumber
    Location:
    Texas
    Gas line upgrade

     
  9. hj

    hj Master Plumber

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    Aug 31, 2004
    Occupation:
    Plumber
    Location:
    Cave Creek, Arizona
    pipe

    The gas pipe sizing is according to published charts and is not an "I think it will work" item. There are many variables besides the btu's of the burners, (your oven and burner btus seem low unless that is what the manufacturer states), overall length of the system and capacity at each connection point. Whether using part of the system will work or not depends on that chart. From here that is not a ballpark price, it is a sandlot price, but even that is subject to the working conditions and the plumber doing the work.
     
  10. jmcintosh

    jmcintosh New Member

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    Carbon Monoxide poisoning

    -In Response to MACPLUMB 777 :confused:

    I am concerned by your comments. What are the dangers of carbon monoxide poisoning from a stove and how do I avoid them? We have a vent hood above the oven. Are Carbon Monoxide detectors not sufficient? We have one in the hall to our bedroom.
     
  11. hj

    hj Master Plumber

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    Occupation:
    Plumber
    Location:
    Cave Creek, Arizona
    Co

    He was using hyperbole. Properly operating and installed gas burning equipment should not create a CO hazard, and has nothing to do with the gas pipe installation.
     
  12. TheOak

    TheOak New Member

    Joined:
    Sep 10, 2008
    Location:
    Idaho
    Could you not have the pressure upped on your gas line by the gas company? This way you could use your existing piping. You would need to have regulators attached to all of your gas appliances, but I think that would be cheaper than having to run new gas lines.

    Edit:

    I just installed a tankless water heater. That is what they did for me to ensure that I had enough gas for the tankless and my furnance. They upped the incoming gas pressure and then placed a regulator to prevent the tankless and furnance from getting too much gas. I had 3/4 all the way. Otherwise, they would probably have had to up my lines to 1 inch or something more.

    Edit:

    Of course your plumber would be able to answer these questions, but if not suggested, you could play dumb and simply just ask "Hey, what about upping the gas pressure, is that possible?"
     
    Last edited: Sep 10, 2008
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