Gas line through a flue

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by Petzold, Jun 6, 2011.

  1. Petzold

    Petzold New Member

    Messages:
    4
    Location:
    Northern Virginia
    I have a chimney with 2 flues for 2 fireboxes. The previous owner installed gas logs in both fireboxes. The gas lines were run outside the house then drilled through the chimney into the fire boxes. On the upper fire box the gas line actually runs through the flue for the lower firebox so that the hot gases pass the gas line. The chimney sweep said they never saw that before and didn't know if that was ok or not. I don't use the fire places a lot but I'm wondering if this is ok or if this is dangerous.
  2. SacCity

    SacCity In the Trades

    Messages:
    189
    Location:
    Sacramento, CA
    Sounds like a bad idea to me.
    One issue is that as the pipe heats and cools the joints are going to expand and contract,
    And with enough movement over time the joints are going to leak resulting in a posible buildup of natural gas in the flew.
    Sounds like a bad idea to me....
  3. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    26,835
    Location:
    Cave Creek, Arizona
    A picture would be interesting, since the gas lines are typically at the "floor" of the firebox, well below the chimney/flue.
  4. Petzold

    Petzold New Member

    Messages:
    4
    Location:
    Northern Virginia
    It is a flexible line so I believe there are no joints going through the flue. Here is what the pipe looks like.

    IMG_0885.jpg
  5. Petzold

    Petzold New Member

    Messages:
    4
    Location:
    Northern Virginia
    I have a fire place on the first and second floor. The gas lines do enter the bottom of both fireboxes however to get to the second floor fire box they ran the gas line through the flue for the first floor fireplace. Attached is a picture up the flue from the first floor fireplace.

    IMG_0886.jpg
  6. Tom Sawyer

    Tom Sawyer In the Trades

    Messages:
    3,231
    Location:
    Maine
    Very illegal, very dangerous, do not use it until someone that knows what they are doing changes it.
  7. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    26,835
    Location:
    Cave Creek, Arizona
    That could be CSST tubing, but I do not see corrugations under the yellow sheath. IF it is plastic it is polyethylene and should not have been used indoors. NEITHER material should pass through the fireplace flue.
  8. Petzold

    Petzold New Member

    Messages:
    4
    Location:
    Northern Virginia
    It's copper tubing and it's not corrugated.
  9. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    26,835
    Location:
    Cave Creek, Arizona
    Interesting. I have NEVER seen "yellow" copper tubing for use in gas lines, and it would normally NOT be labeled for a 2 psi system, unless it was done in the field. Copper for natural gas is not a common item in this area, but no matter where it is used there are specific restrictions on it, one of them being how connections are made. They CANNOT be "soldered".
  10. Tom Sawyer

    Tom Sawyer In the Trades

    Messages:
    3,231
    Location:
    Maine
    We use clad copper here for LP high pressure lines from the tank to the house but not inside and certainly not through a flue.
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