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    catchtom's Avatar
    catchtom Posts: 2, Reputation: 1
    New Member
    		  
    #1

    Aug 28, 2007, 08:05 AM
    Washer drain overflow - plumbing diagram - do I need additional air vent
    Hi, I have a 3" sewage pipe that runs from the basement floor to the roof. I cut about a foot of the sewage pipe and connected a 2" pvc pipe with 2" trap for the washer drain line.
    I am getting over flow from the stand pipe. There is no blockage of the sewage pipe. When I cut it open, it was clear and clean. Above the basement there is only a sink that shares that sewage line. My question is do I need to add an air vent(line)? Should I use a compressor where the washer line meets the stand pipe and get rid of the trap to improve water flow? Attach is a diagram of the plumbing. Please Help. Thanks you so much.

    Tom
    speedball1's Avatar
    speedball1 Posts: 29,301, Reputation: 1939
    Eternal Plumber
    		  
    #2

    Aug 28, 2007, 08:32 AM
    Your attachment didn't make it. How high did you make your stand pipe? Do you have a new Maytag washer? If the stand pipe's 36" or longer then perhaps you need to install a compression fitting, (See image) and make it a closed system. I've had one for years with no bad effects. Good luck, Tom
    ballengerb1's Avatar
    ballengerb1 Posts: 27,378, Reputation: 2280
    Home Repair & Remodeling Expert
    		  
    #3

    Aug 28, 2007, 08:34 AM
    I did not see your attachment but did you understand that you tapped into the vent stack, not a sewage pipe? You have created a wet vent and I suspect it isn't clean as you think donw at the floor level. Rod it out, the 2" pipe should handle nearly all washer, maybe not Maytag.
    catchtom's Avatar
    catchtom Posts: 2, Reputation: 1
    New Member
    		  
    #4

    Aug 29, 2007, 06:23 AM
    I checked and the kitchen sink upstairs water is flowing down this sewage pipe. I tried the compression fitting and it worked. Somehow it slowed down the water flow and even prevent the water from flowing up the stand pipe. I used to be able to hear the water rise up the stand pipe and the stand pipe would get heavy but now it doesn't. Thanks so much for your help.
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