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Old 12-05-2008, 06:35 PM   #16
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How to repair a hole in cast Iron pipe?


Hmmm, that thought never entered my mind.

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Old 12-07-2008, 01:48 AM   #17
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How to repair a hole in cast Iron pipe?


I too have a hole in a pipe that needs to be fixed asap. It's about the size of a nickel. The pipe is under the kitchen sink and the hole is on the inside of the bend on an elbow piece. I would just replace the pipe but the other end goes straight through the back of the cabinet and disappears into the wall. No $$$ for a plumber right now, finances are thin due to holidays so it's not an option. If anybody has any ideas i'd appreciate it. Thanks.

- Jeremy
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Old 12-07-2008, 09:26 AM   #18
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How to repair a hole in cast Iron pipe?


Skates - you may want to start a new thread and post a picture -

To the original poster - the hole may have been drilled to see where a clog existed , or to try and insert a a thin snake ?
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Old 12-08-2008, 02:29 PM   #19
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How to repair a hole in cast Iron pipe?


Thanks guys if I do need to plug it I will make sure that there no bits to cause snags When I sanded down to the bare metal (no power tools used) I took a closer look at the hole which is situated on the weld join. I tried to poke a tooth pick through, it would not go through. After some time I decided that this “fault” has been there since 1955 when then house was first built. So I was left with the Problem of identifying where the long rust streaks are coming from. After filling and emptying the bath and flushing the lavatory at the same time I guess I have given the pipe a good test… but no leak! The pipe is exposed in a cold (unfinished) part of the basement and the other side of the basement is finished with a gas fire installed. There are doors Etc dividing the 2 rooms. We are keeping our fingers crossed that what we are seeing is condensation caused by the gas fire emissions from the family room drifting through and coming in contact with the cold metal. The pipe is now lagged with insulation and anywhere I could see any pitting or tiny holes (3 places) I have taped some tissue over the hole with clear tape. I will leave that lot for about a month and report back my findings. As Majakdragon says “If you have never made a mistake, you haven't done much”
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Old 03-03-2009, 01:42 AM   #20
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How to repair a hole in cast Iron pipe?


Using This stuff? Anyone try this on cast iron drain lines?

http://www.cisoldit4u.com/castaloy.htm

The last thread above, mentioned a hole in the "weld joint" So cast iron is welded together right.. mmm Seems plausible..If its joined in MFG by WELDING, why then couldnt it be REPAIRED BY WELDING/Soldering as long as the section was cleaned and the "weld" could be done safely?

I have a very similar problem mentioned in this thread, its just a small hole which is rusting out and leaving streaks on drain pipe.. no bigger than a pencil lead its also easy very easy access for me.. Before I found the link above, I figured I could ARC/ROD weld a spot to fill in the hole (isnt most cast iron weldable?) I am asking because My friend welds cast iron ornamental iron onto his railings when doing curls and stuff... and it holds very well. I am wondering if regular arc welding rods would work? Just clean the area spot weld grind smooth?

Or the stuff above should work too and it doesnt seemt to even require a Arc Welding Kit, just a regular propane torch and some flux?

Seems to me either method would work for small holes/cracks, as long as the pipe is easily accessable and a torch/arc welder can be used safely? I dont think the welded plug in any case would protrude too far into the hole to become a problem.. larger holes might be an issue, but I bet you could even build up the material slowly?

Just my 2cts

Any opinions or experience trying welding or this rod system above..welcome.. I will also post how mine turned out.. My pipe is a drain line which is open in a garage and completely painted.. so the hole/rust line is pretty visible.. and any further leaks would be quickly apparent. I was thinking about cutting the section out and replacing using G WormCouplings, but the rest of the pipe seems fine.. Besides if this works and I can confirm it, it should be MUCH easier than cutting out pipes, and should be MUCH stronger and more permanent than other methods like epoxy/silicone.. etc.?

Only other danger I could foresee would be igniting the "Methane GAS" in the drain line! ahhaa ALA Tim Taylor.. Probably not likely.. worse case would make an underwater flame bubble in the camode.. or flash out the vent pipe? hehee.

Last edited by HelpingHands; 03-03-2009 at 01:51 AM.
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Old 03-03-2009, 08:25 AM   #21
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How to repair a hole in cast Iron pipe?


As far as the methane gas goes, you might want to catch it on video. I can see it now, a 6 foot flame shooting out of the toilet. You would win the Americas Funniest Videos award of $100K.
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Old 05-28-2009, 10:57 PM   #22
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How to repair a hole in cast Iron pipe?


believe it or not bondo works great on stuff like that, its used on wooden boats in places where you would wouldnt think, tiger hair is even better, its just a drain pipe
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Old 05-29-2009, 11:58 AM   #23
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How to repair a hole in cast Iron pipe?


The problem with using tiger hair is that tigers are very hard to find, much less catch. And then when you pull out some hair they get very very cranky.
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Old 05-29-2009, 02:49 PM   #24
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How to repair a hole in cast Iron pipe?


There are several different types of iron pipe. Cast iron is typically more than 30 years old, it has been replaced with ductile iron pipe (closer to steel than cast iron). There is also wrought iron, very hard to find, used almost entirely for decorative railings and sculpture.

Cast iron is hard to weld due to the distribution of carbon grains in it, ductile iron is easier to weld, and wrought iron is the easiest to weld, or so I am told by people who work with wrought iron.

i have seen ductile iron tapped using a steel drill bit and a tap on commercial projects. Cast iron is hard to tap, tends to crack. Not sure if you can tap wrought iron, pretty irrelevant since you will never see wrought iron in residential use for piping. I had a broken fitting on my furnace, couldn't weld it or solder it, so I used epoxy putty. Worked great, has lasted more than 10 years now, no leaks.
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Old 05-29-2009, 11:54 PM   #25
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How to repair a hole in cast Iron pipe?


mayby true, a tiger is hard to catch, im not to sure but i think some one else catchs it a puts the hair in the can
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Old 11-13-2011, 10:27 AM   #26
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How to repair a hole in cast Iron pipe?


Just adding this comment because this thread was referenced in another post today: when cast iron drain pipes are developing holes (as opposed to cracks along the length of the pipe, which usually result from freezing) - and especially if they're horizontal rather than vertical runs -it's not uncommon for there to be other nearby sections of pipe which are also nearly rusted through, in which case it makes sense to just bite the bullet and replace all of the material that is reasonably accessible.
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Old 11-13-2011, 10:35 AM   #27
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How to repair a hole in cast Iron pipe?


Good point! But in some cases, there is just a tiny hole dripping in an easily accessible spot that the solutions offered here are ideal for.
THEN you just hope the rest of the pipe lasts a few more months/years until it all needs replacing.

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