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Thread: Underground conduit cleaning

  1. #1

    Underground conduit cleaning

    Does anyone know of a method, or preferably have experience, for cleaning partially blocked RMC - underground and concrete encased?
    More specifically several feeds (3/4" & 1") in a duct bank that have not fared so well after years of water, dirt, ash, and acid infiltration.
    Cleaning / Rodding / Roto-Rootering an existing conduit (a concrete encased conduit), ultimately allowing the new installation of a properly rated cable. Can it be done?

  2. #2
    Join Date
    May 2003
    Location
    Leesburg, VA
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    6,931
    We have used a plumbers camera to investigate the issues, and the pulled different sized mandrels through the conduit, sometimes it works sometimes not, Having the camera on a Snake was a big help.
    Brian John
    Leesburg, VA

  3. #3
    Join Date
    Feb 2003
    Location
    Illinois
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    18,977
    I have hooked a fire hose to underground ducts to flush them out, but you still need to use a mandrel after you have flushed them to verify that there is not a soild obstruction or a colapased section.
    Don
    Don, Illinois
    "It is the first responsibility of every citizen to question authority." B Franklin

  4. #4
    Join Date
    Jan 2004
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    Right here.
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    I got a flyer a while back from a company that makes wire brush mandrels. That sounded like a fine way to get little sharp metal bits all through the pipe. Didn't appeal to me.

  5. #5
    Join Date
    Sep 2004
    Location
    Durham, NC
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    5,207

    Time is againest You

    Other than the fact that time and other chemicals are againest You,
    Coke-Cola for short terms situations, seen it clear out dirt cludes,
    desolve rocks, grout, works great for 1/2" - 3/4", never use more than
    a few liters and left it over night.
    If your even thirsty, your two quarts low.

  6. #6
    Join Date
    Apr 2005
    Location
    Atlanta,GA
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    3,957
    Quote Originally Posted by cadpoint
    Coke-Cola for short terms situations, seen it clear out dirt cludes,
    desolve rocks, grout, works great for 1/2" - 3/4", never use more than
    a few liters and left it over night.

    I have herd of useing coke. We did use white vinegar on a short run of 1". Something like CLR might work but you would need to flush the pipe well.
    90% of doctors don't graduate in the top 10% of the class.

  7. #7
    Join Date
    May 2007
    Location
    Lone Star State
    Posts
    54
    Diet coke & Mentos works every time.
    Hey! You set me up...OK?
    Jeff Weissman - Master Electrician
    Lone Star State

  8. #8
    Thanks for the replies. I never thought of coke, but i heard it works wonders cleaning toilets.
    I talked to mobile pressure washing company, they have a 1/4" high pressure snake, with compressed air or fluid, as another option.

  9. #9
    Join Date
    Jul 2005
    Location
    Tennessee
    Posts
    12,196

    blockages

    I've seen the white vinegar work well on grout.

  10. #10
    Join Date
    May 2007
    Location
    Central Texas
    Posts
    147
    I carry a shop vac with leaf blower as well. Works on most also easy for getting your string lines through and blowing water out.
    Ask the experienced rather than the learned.
    LMNelectrical.com

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