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Thread: 3/4" pvc pipe seems to have swollen/expanded

  1. #1
    DIY Junior Member sshepherd's Avatar
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    Jul 2011
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    Pendleton Oregon
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    Default 3/4" pvc pipe seems to have swollen/expanded

    I put in a new irrigation system last spring. I hadn't hooked up the drip system last year and am attempting to do so now except the pipe that I put in last year is just slightly bigger that the fitting that I just bought. The extra pipe in the garage (same pvc pipe) still fits the new couplers. I have tried sanding but it did not help. Any suggestions? Why did the pipe swell?

  2. #2
    irrigation tech. mike1059's Avatar
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    Portland, OR
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    Although I have never run into a swolen pipe I have had deformed ends that will not fit a new fitting. Do you have room to cut the pipe back 1 or 2 inches, that should get you a clean fit.

  3. #3
    DIYer, not in the trades LLigetfa's Avatar
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    Feb 2011
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    NW Ontario, Canada
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    Is this flex or rigid PVC? Flex PVC has a much lower pressure rating and so exposure to high pressure at warm temperatures could account for the swelling.

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