Underground conduit cleaning

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gabany

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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?
 
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.
 
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
 
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.
 
Time is againest You

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.
 
cadpoint said:
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.
Click to expand...


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.
 
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.
 
blockages

blockages

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