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    Steamfitter's Avatar
    Steamfitter Posts: 5, Reputation: 1
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    #1

    Apr 4, 2012, 12:09 PM
    Gasses in main stack
    I am replacing my cast iron main stack with ABS. The plan was to use a grinder to cut the cast just above the clean out. Is there any possibility of flammable gasses in the stack that could ignite ?
    speedball1's Avatar
    speedball1 Posts: 29,301, Reputation: 1939
    Eternal Plumber
    		  
    #2

    Apr 4, 2012, 12:36 PM
    No! If you use a grinder to cut the stack you're not going to blow your house up. I'm concerned with how you're going to hold the stack up once it's cut. Or are you simply going to let it drop? Good luck, Tom
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    Steamfitter Posts: 5, Reputation: 1
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    #3

    Apr 4, 2012, 01:31 PM
    Thanks for the quick reply and your concern is also mine. I was shocked to find that there wasn't a single riser clamp or bracket of any kind. Plan is to add a couple riser clamps and hanger brackets at the bottom and start removing cast from the top - down.
    hkstroud's Avatar
    hkstroud Posts: 11,929, Reputation: 899
    Home Improvement & Construction Expert
    		  
    #4

    Apr 4, 2012, 04:01 PM
    Removing Cast Iron Pipe - YouTube

    A lot faster than a grinder.
    Can be rented.
    speedball1's Avatar
    speedball1 Posts: 29,301, Reputation: 1939
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    #5

    Apr 5, 2012, 05:21 AM
    If you follow Harolds advice about cast iron cutters remember there are two types of cast iron cutters. Snap and ratchet, You want the ratchet, (see image) Good luck, Tom
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