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Leaky Gas Valves-the Real Cause

Discussion in 'Residential' started by QuickRick, Nov 14, 2017.

  1. QuickRick

    QuickRick Proud to be a Deplorable

    Messages:
    634
    Location:
    Capital Beltway, Md.
    Guys ,

    In this October's Mid-Atlantic HVAC Insider Magazine is an article by David Richardson about leaky gas valves and the very simple reason that they leaked. I will give you a hint; it has a lot to do with the installation. This old fashioned installation tip is just as relevant as ever it seems.

    http://www.hvacinsider.com/national/tech-carbon-monoxide-leaking-gas-valves

    You may have to cut and paste the link into your browser but it's worth the effort.

    QR
     
    Zman and Chuck like this.
  2. doc havoc

    doc havoc A cunning linguist

    Messages:
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    Location:
    45.780245, -91.731582
    Interesting CO test to determine leakage.
     
  3. NZ All Blacks Fan

    NZ All Blacks Fan Just Another swinging Dick

    Messages:
    9,389
    Location:
    West Coast - Canada
    Canadian standards req a drip leg on any drop over 3ft - I put them on all drops to the appliance regardless
     
    jpb2 likes this.
  4. knave

    knave Undeterred

    Messages:
    8,150
    Location:
    Out for a rip
    Lots of gas valves have a screen in them. How could the missing drip leg cause a gv to lock open if it has a screen.
     
  5. MOFO the psychic gorilla

    MOFO the psychic gorilla sitting on two achers

    Messages:
    1,849
    The last house I sold they tried negotiating with some know-it-all arrogant inspector. One of the things he pulled was the leaking gas valve with electronic detector at the manifold. Another was ac wire and breaker size. I was like are you kidding me. I bayatch slapped him in a response point by point sent to my lawyer. I got to see the lawyers actual response and he didn't mention any of it but told them to eff off lol :uzi:
     
  6. mike1020

    mike1020 entitled millennial

    Messages:
    18,199
    Location:
    on the roof of target
    Nothing worse than a code nazi
     
    Texas-Tech likes this.
  7. Chuck

    Chuck SSP

    Messages:
    7,841
    Location:
    LAX
    Works better on natural draft, I’ve found a few. I never did find one that way with induced draft, not saying it’s impossible just haven’t seen it.
     
    doc havoc likes this.
  8. Chuck

    Chuck SSP

    Messages:
    7,841
    Location:
    LAX
    I wish David Richardson would come here more often
     
  9. knave

    knave Undeterred

    Messages:
    8,150
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    Out for a rip
    X2
     
  10. knave

    knave Undeterred

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    8,150
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    Out for a rip
    X2 @Doc
     
  11. Catpower

    Catpower The Crowd Pleaser

    Messages:
    22,238
    Location:
    in the Cabana

    ****ing home inspectors are a ****ing joke. I am always reminded of one who wrote up aluminum wire to a can coil,it is legal so I just loosened the lug screws and shot some NoAlox in there to make it look like i was doing something. While I was crawling across the attic there was a garden hose running across the rafters,I followed it it was going to a gas log lighter, and out the soffet to the gas meter, not a ****ing thing wrote up about it

    But it was when i got done
     
  12. Zman

    Zman Hanging by a Thread

    Messages:
    929
    Location:
    The "I know a Guy" State
    Always questioned the use of Teflon tape as a potential hindrance to a valve closing. Prefer pipe dope. Seen a lot of missing drip legs when I worked as a Gas Policeman. Some of the old timers used a match on an extender to check for leaks! :eek:
     
    oroy54 likes this.
  13. Catpower

    Catpower The Crowd Pleaser

    Messages:
    22,238
    Location:
    in the Cabana
    It might have been, quite a while ago Carrier put out a service bulletin about not using teflon on gas piping,but it was probably just a reason to get the heat off them because of the sorry ****ing Essex gas valves they used

    You could always know in advance you had a bad Essex gas valve, it was the one a 2am on a no heat with a bad T'couple.The failure was when you turned it to pilot to light it, it wouldn't turn back to on, so you got to change a gas valve in the dark of the night
     
  14. doc havoc

    doc havoc A cunning linguist

    Messages:
    9,089
    Location:
    45.780245, -91.731582
    Been there, saw that and did it once myself. Theoretically, it is completely safe. As long as you discount the obvious danger of catching something on fire. There is no air in the gas line, so no fire could burn inside the line. And as long as a positive pressure remains in the gas line the flame should never burn back inside anyhow. Same reason a Bic lighter doesn't burn back inside the lighter. Doesn't mean I'm ever going to do it again though.
     
  15. HMD

    HMD does it matter?

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    93,114
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    here
    guess im an old timer.
     
  16. mike1020

    mike1020 entitled millennial

    Messages:
    18,199
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    on the roof of target
    Do you own the channellock match extender with the blue handle?
     
  17. ACE Heating & Cooling

    ACE Heating & Cooling New Member

    Messages:
    2
    Location:
    Crossville, TN
    I prefer pipe dope thats just me.



    No advertising in the open forum please keep it in your profile
     
    Last edited by a moderator: Nov 15, 2017 at 8:54 PM
  18. Jon

    Jon Team Canada

    Messages:
    7,679
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    Canada eh!
    You guess :dunno::headscratch::confused::rolleyes:
     
  19. MNHVAC

    MNHVAC Man on a mission

    Messages:
    107
    Location:
    MN
    [​IMG]
     
    doc havoc likes this.
  20. mike1020

    mike1020 entitled millennial

    Messages:
    18,199
    Location:
    on the roof of target
    The picture actually bears a shocking resemblance to @knave
     
    MNHVAC and doc havoc like this.