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Old 11-14-2007, 09:46 AM   #1
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smoothening cut cast iron pipe before mounting fernco coupling


i cut some cast iron pipe to attach PVC using fernco. but over the decades, lots of stuff caught on to the cats iron, oxidation, rocks, etc., it is not very smooth.

i was able to beat most off with a hammer but some unevennes remains, causing the fernco to not gasket entirely, as a results it leaks.

was wondering what can be used to smoothen an old crusty cast iron pipe around ? i do not think sand paper will do.

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Old 11-14-2007, 10:48 AM   #2
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smoothening cut cast iron pipe before mounting fernco coupling


Depending on the size of your pipe try a 4" grinder.

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Old 11-14-2007, 03:51 PM   #3
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smoothening cut cast iron pipe before mounting fernco coupling


Are you working underground or above ground?
Are you using the clamps completely enclosed by a metal band or the type with two metal bands, one on either end?
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Old 11-14-2007, 09:36 PM   #4
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smoothening cut cast iron pipe before mounting fernco coupling


under. over fernco goes a metal sleeve with two bands, just like the fernco bands. code says if you bury, must have the sleeve over fernco.
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Old 11-14-2007, 11:25 PM   #5
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smoothening cut cast iron pipe before mounting fernco coupling


The mushroom-like bubbles that appear on cast iron are mineral deposits and other unmentionable subtances that have worked their way through and have since formed a "scab" on the exterior surface of the pipe. Grinding or chiping these off may cause more trouble than it's worth,, and spring a nasty leak.
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Old 11-15-2007, 01:20 AM   #6
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smoothening cut cast iron pipe before mounting fernco coupling


Sounds like its in bad shape anyways. This is inside the building? Are you torqing the bands down to 60 pounds?
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Old 11-15-2007, 05:39 PM   #7
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smoothening cut cast iron pipe before mounting fernco coupling


I'd clean it up as well as I could, you might need to use a brick hammer or a chipping hammer to get some of the worst stuff off it. If you break it trying to get that stuff off the pipe was shot anyway so you're no worse off. Then go to a wire brush, even some sandpaper to get all the rust and mineral deposits off it. Then I would smear a coat of silicone on the pipe and then slide your coupling on. Hopefully the silicone should fill in all the pits in the pipe. What are you using to tighten the clamp? It should be pretty tight.

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