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Old 08-26-2010, 03:42 PM   #1
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Best way to cut galvanized drain pipe?

I have a house built in 1972. I had a home inspection before I purchased but I guess the inspector wasn't very interested in plumbing. I'm missing a shutoff valve in the kitchen and already had to replace the toilet. Under the bathroom sink there is the original P trap which seems to be 2" galvanized steel. The former owners attached ANOTHER PVC P trap above it I suppose to help drain of new vanity reach the old drain. It clogs constantly. I want to cut out old drain pipe so I have a 4" stub to attach new PVC trap to. I just called a local plumber and he's talking about late next week before he can look at it and says he "needs" to cut out ALL the galvy in the house. I have a reciprocating saw and a dremel multi master and a few other tools. What's the best for cutting the pipe? Should I rent something?
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Old 08-26-2010, 04:00 PM   #2
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Best way to cut galvanized drain pipe?

I don't know if I'd cut it all out until I was sure it was necessary. Even if you do decide to remove it all there won't be a need to cut every joint. If there are ground-joint unions in any sections to be removed you won't have to cut there at all.

Once you open a couple pieces up you'll know if you need to remove it all. I would use a 4-1/2" grinder with a cut off wheel for any necessary cuts. It's quick, but it's noisy. Wear hearing and eye protection!
"The physician can bury his mistakes, but the architect can only advise his clients to plant vines." -- Frank Lloyd Wright
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Old 08-26-2010, 04:22 PM   #3
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Best way to cut galvanized drain pipe?

Thanks for the reply. I do have a grinder that's seldom used as I hate how stuff flies around from it. The plumbing seems to function so I don't want to cut it all out! I just wanted to take out the extra P trap. It looks terrible and constantly gets clogged. I can't believe the inspector didn't notice it. Replacing all the plumbing seems a bit extreme. He must have boat payment due!
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Old 08-26-2010, 04:44 PM   #4
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Best way to cut galvanized drain pipe?

sawzall and a metal cutting blade. If you can cut where there are threads now it will start easier and cut quicker. Use a nohub coupling to attach new ABS/PVC and go nuts
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