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Thread: Pipe work Qs

  1. #1

    Pipe work Qs

    Starting to think about my pipe work (hur hur hur).
    Plan is

    4" soilpipe from the bottom drain to the filter house.
    I've one joint to make underground (straight coupler solvent weld) , will 4" push fittings work in the filter house above ground?

    2" from the skimmer to the filter house.
    again a few underground joins but not worried about them.

    Then I have 2 x 2" returns ,
    These returns will be long....somewhere between 12/15m
    Are the returns too big ? there is very little head height - a pair of DM varios (10k,20K).

    Any advice welcome



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  3. #2
    Senior Member Rank = Supreme Champion RS2OOO's Avatar
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    From what I've read on here, and from my own new pond which already had Soil Pipe fitted underground, I don't see any problems with that.

    I even have a couple of pushfit fittings in the filter pit, but only because I ran out of Solvent Weld 90 degree bends during the build and had a couple of push-fits lying around. They have performed faultlessly so far but the intention is definitely to replace with SW fittings.

    No way would I fit push-fit fittings anywhere between bottom drain and filter, I just wouldn't risk that.

    After the filter and after a ball valve I would only use if there was no other choice. If you want to have the flexibility of being able to change pipework in the future I'd say to join with rubber couplings instead, and change them every 2 years as a maintenance item.

    I used black solvent weld waste pipe between the underground soil pipe to the filters and having seen how it flexes when I turn the ball valves on and off I wish I had gone for grey solvent weld pressure pipe instead. I'm sure long term this is an emergency waiting to happen especially as the ball valves stiffen over time.


    So, in short, if gravity fed, any pipework before your pump should be grey pressure pipe for 100% piece of mind.

    All my opinion of course.

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  5. #3
    Senior Member Rank = Grand Champion davethefish1's Avatar
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    Quote Originally Posted by CobraKoi View Post
    Starting to think about my pipe work (hur hur hur).
    Plan is

    4" soilpipe from the bottom drain to the filter house.
    I've one joint to make underground (straight coupler solvent weld) , will 4" push fittings work in the filter house above ground?

    2" from the skimmer to the filter house.
    again a few underground joins but not worried about them.

    Then I have 2 x 2" returns ,
    These returns will be long....somewhere between 12/15m
    Are the returns too big ? there is very little head height - a pair of DM varios (10k,20K).

    Any advice welcome
    the 4" push fit soil will generally work, but consider how much hassle it will be to swap if you get a leak....
    but solvent weld and/or rubber boots would be better after a solvent welded valve.

    that run is long, and will incurr friction losses.
    how much depends on how much water lph you want to put through it...
    but i'd err on the 20,000 varios as they have a bigger head height than the 10,000's that helps over come the losses.
    what size pond?

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  7. #4
    Thanks for the input.
    I'm thinking push fit because I will 100% be chopping and changing equipment .
    What about the 2" returns , am I worried about nothing there ?
    Returns will be just under the level of the water .

    Edit - not sure on final size, 20/25k L
    I bought the 2 pumps years ago when someone posted a bargain alert here so I have them allready.

    Will the 2" help me or work against me ?
    Last edited by CobraKoi; 06-07-2022 at 10:20 AM.

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  9. #5
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    Could also go flexi rubber boots which give a good seal on both pressure and solvent weld pipes plus you don't have to be spot on with the angles of things going together like you do with pvc pipe. Quite expensive though but also quite adaptable. I've used them to hold 2" slide valves onto 2" and even 1.5" pipes. Just make sure you get the right ones as some are not UV stable. I've found Fernco are the best ones and Flex Seal are the UK branded version of the Fernco ones which are American I think? The Evolution Aqua ones are pretty good too.
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    Get up, eat jelly, sandwich bars and barbed wire,
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  11. #6
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    From what I've seen on here if you go 4" in you go 2" out.

    On my 2 systems though I've gone 3" in and 2" plus 1.5" out. There's also bits of 4" in both of my systems too as it's a bit of a Heinz 57 set up on them both
    ________________________________________________
    All we ever wanted was everything,
    All we ever got was cold,
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  13. #7
    I probably over thinking it

    Do you need to push mesh on the returns to stop anything swimming in there ?
    Small fish/frogs etc ?

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  15. #8
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    Quote Originally Posted by CobraKoi View Post
    I probably over thinking it

    Do you need to push mesh on the returns to stop anything swimming in there ?
    Small fish/frogs etc ?
    Good question lol

    If the returns are above the water level it would stop any fish getting in there apart from if they jump out of the water into it but frogs etc could climb into them. If the returns are under the surface then a lot more could get into them. You can get plastic strainers that go into or over the ends of the pipes.

    What would be more of a concern for me would be a small to medium sized fish getting wedged into the end of the return if things kick off during the mating season
    ________________________________________________
    All we ever wanted was everything,
    All we ever got was cold,
    Get up, eat jelly, sandwich bars and barbed wire,
    Squash every week into a day.

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  17. #9
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    This is what I was thinking about

    https://coastal-koi.com/product/filter-cages/
    ________________________________________________
    All we ever wanted was everything,
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    Get up, eat jelly, sandwich bars and barbed wire,
    Squash every week into a day.

 

 

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