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hairline crack (with very slow drip) in cast-iron drain pipe.

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hairline crack (with very slow drip) in cast-iron drain pipe. blueman 07-15-2005
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Posted by blueman on July 15, 2005, 3:50 am


We have an old cast iron drain pipe (maybe 100 years?) going from the
main vent stack to the city drainage system.

I just noticed a damp spot underneath an area of the pipe and a
corresponding light wetness along the bottomside of the pipe. Looking
more closely, there was an irregular hairline crack in the pipe,
extending perhaps 2-3 inches.

The discharge is (currently) clear and odorless and is truly minimal
-- i.e. you can't even see drops dripping it is so slow.

So, short of replacing the pipe, what can i do to fix it?

Thanks


AppliancePartsPros.com, Inc.
Posted by Mikepier on July 15, 2005, 1:32 am


Try to repair it with epoxy or JB Weld. It should repair it. Otherwise
worse case, you can just replace that section of pipe with PVC and 2
no-hub clamps.



Posted by Abe on July 15, 2005, 2:12 am


>Try to repair it with epoxy or JB Weld. It should repair it. Otherwise
>worse case, you can just replace that section of pipe with PVC and 2
>no-hub clamps.
--------
JB Weld is OK. Make sure the crack is dry through and through first.

A higher quality fix would be to actually weld in a patch. It depends
on how much peace of mind you want.


Posted by blueman on July 15, 2005, 10:01 pm


> >Try to repair it with epoxy or JB Weld. It should repair it. Otherwise
> >worse case, you can just replace that section of pipe with PVC and 2
> >no-hub clamps.
> --------
> JB Weld is OK. Make sure the crack is dry through and through first.
>
> A higher quality fix would be to actually weld in a patch. It depends
> on how much peace of mind you want.

I am not as worried about the current minimal leakage through the
hairline crack (even duct tape seems to control that minimal level :).

Rather, I am worried about whether the crack itself will continue to
spread and lead to a more catastrophic failure of the main drain pipe.

Would JB Weld be sufficient to prevent further destabilization of the
pipe's integrity or is the hairline crack really just a symptom of a
much more significant materials failure and a warning sign of an
impending blowout?


Posted by No on July 15, 2005, 10:09 am


Could it be condensation?

What about using one of those no hub connectors as a patch. Would reqire
cutting the coupling. For such a very small leak may do fine and is cheap
and quick.

> We have an old cast iron drain pipe (maybe 100 years?) going from the
> main vent stack to the city drainage system.
>
> I just noticed a damp spot underneath an area of the pipe and a
> corresponding light wetness along the bottomside of the pipe. Looking
> more closely, there was an irregular hairline crack in the pipe,
> extending perhaps 2-3 inches.
>
> The discharge is (currently) clear and odorless and is truly minimal
> -- i.e. you can't even see drops dripping it is so slow.
>
> So, short of replacing the pipe, what can i do to fix it?
>
> Thanks




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