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  1. #1
    Join Date
    Oct 2006
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    Default Flex in sewerage pipe

    Hi All,
    I'll be buying and laying some 100mm sewerage pipe on the weekend and need some advice.

    The trench that the pipe will be laid in has a slight curve to it and I was wondering if the 100mm sewerage pipe has much flex in it (I've never used it before) or if I may need an elbow joint along the curve somewhere.

    I'm guess I'm really just trying to get an idea of how much flex the pipe has, or what's it's maximum bend radius is.

    The pipe will be used as part of a wet stormwater system for filling rain water tanks.
    Cheers.

    Vernon.
    __________________________________________________
    Bite off more than you can chew and then chew like crazy.

  2. #2
    Join Date
    Feb 2008
    Location
    Sydney
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    66

    Default

    over a length, you will get some bend in a 100mm pipe, I would rather go for a 5 or 15 deg bend in the middle and straighten the the rest of the trench.

  3. #3
    Join Date
    Oct 2006
    Location
    Armidale NSW
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    Default

    Thanks Davo.

    Looking at the Iplex website I can find a 15 deg. bend (which is too sharp and angle), but can't find a 5 deg.

    Are 5 deg. bends readily available?
    Cheers.

    Vernon.
    __________________________________________________
    Bite off more than you can chew and then chew like crazy.

  4. #4
    Join Date
    Aug 2003
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    Conder, ACT
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    Default

    It bends quite a bit so, depending on the definition of slight, there should be no problems.
    ps: If it is storm water then you should be using storm water pipe, not sewer.

  5. #5
    Join Date
    Oct 2006
    Location
    Armidale NSW
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    Default

    Quote Originally Posted by DavidG View Post
    If it is storm water then you should be using storm water pipe, not sewer.
    True ... but part of the run is under a driveway and rainwater is our only source of water, so I would rather spend a little extra and use a heavier duty pipe for all underground runs.

    I will be using normal 90mm pipe for all exposed work.

    Better to be safe than sorry.
    Cheers.

    Vernon.
    __________________________________________________
    Bite off more than you can chew and then chew like crazy.

  6. #6
    Join Date
    Jan 2007
    Location
    Adelaide - West
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    Default

    Quote Originally Posted by DavidG View Post
    It bends quite a bit so, depending on the definition of slight, there should be no problems.
    ps: If it is storm water then you should be using storm water pipe, not sewer.

    I always go for sewer grade pipe, no matter what,

    Yes you can use stormwater
    Yes sewer is alot more expensive

    But it is better
    If you dont play it, it's not an instrument!

  7. #7
    Join Date
    Jul 2007
    Location
    Sydney-south
    Posts
    333

    Default

    You can buy 5 degree bends at any plumbing suppliers, I prefer to trim the trench though, and definately not flex the pipe..............
    Plumbers were around long before Jesus was a carpenter

  8. #8
    Join Date
    Jan 2008
    Location
    Brisbane
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    Default

    Some shire councils will only let you use stormwater grade for stormwater and dwv for house drain ie Logan Qld, But I dont live there and always use dwv for its better qualities. Any plumbing merchant will have 5 degree bends in F&F and M&F.
    If you are not part of the solution then you are the problem

  9. #9
    Join Date
    Oct 2006
    Location
    Armidale NSW
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    53
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    Default

    Well I ended up getting a 5 deg elbow when I got the pipe and stuff this morning, but ended up not using it. There was easily enough flex in the 100mm pipe to allow it to follow the trench line (it's quite a sweeping curve).

    Thanks all for you help and advice.
    Cheers.

    Vernon.
    __________________________________________________
    Bite off more than you can chew and then chew like crazy.

  10. #10
    Join Date
    Jul 2007
    Location
    Sydney-south
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    Default

    That pipe will fatigue and eventually fail, especially at any joins that happen to be in the curve of the trench!
    Plumbers were around long before Jesus was a carpenter

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