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Featured Help needed with weir placement

Discussion in 'Help and Advice' started by McPikie, Jun 10, 2014.

  1. McPikie

    McPikie Registered

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    Right, drill bit is here, so need to crack on. I'm having my weir about 6" x 6" x 3" in the top left of the tank. However, I'm a little confused at placement of the holes.

    As I want the water line hidden in the pelmet, do both holes need to be above the pelmet, or one below (with the tap on) and then one above as the secondary drain?? Does the upper hole have to be inline with the weir combs or above?

    [​IMG]weir2 by McPikie, on Flickr

    [​IMG]weir1 by McPikie, on Flickr

    If anyone can help, I would really appreciate it

    feel free to mark on this pic as to the placements

    [​IMG]20140605_205244 by McPikie, on Flickr
     
  2. Marc86

    Marc86 Registered

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  3. leopardshark

    leopardshark Registered

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    I dunno mine come up through the bottom...
     
  4. Matt@Epo

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    is it a full height weir? The hole placement doesnt really matter as its the weirs height that controls DT water level not the hole position within the weir
     
  5. McPikie

    McPikie Registered

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    [MENTION=16594][email protected][/MENTION] no, its going to be around 6" x 6" in the top left corner, drilling the back glass.

    my issue is I dont wanna drill too low or high with the secondary pipe, so it makes the DT level drop below the pelmet
     
  6. PaulW

    PaulW Registered

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    as matt said the holes make no odds, its the height of the top of the wier that will determin the water level in the dt. the holes will only drain the water in the wier.
     
  7. Matt@Epo

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  8. McPikie

    McPikie Registered

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    I'm still confused. So if I run both sides of the weir right to the top level of the tank, and have the bottom of the combs starting above the bottom of tje pelmet, that will work?
     
  9. Matt@Epo

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    the glass of the weir needs to be about 30-40mm below the glass of the tank. Then you add weir combs. Use the aqua medic combs so that the water level can be fine tuned. If you give me your tank dimensions I will draw it quickly for you
     
  10. leopardshark

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    I'd have a clearance space to take the combs out and clean them..
     
  11. McPikie

    McPikie Registered

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    Perfect, exactly what I was thinking. Would you say triangular is quieter?

    I was going to run 2x25mm outlets, main one with a tap on.

    I already have the weir comb from the old one in the 200, so just need the acrylic sorting and positioning of outlets (both under pelmet line, or one under, one over?)

    This is what I have to play with

    [​IMG]20140531_165050 by McPikie, on Flickr
    [​IMG]20140531_165231 by McPikie, on Flickr

    Tank is 80cm across the front by 50cm front to back

    Thanks again in advance
     
  12. Matt@Epo

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    I wouldnt run two drains on a tank that size, in a weir that size. Yes a triangular front face is quieter because the water cresting over the top doesnt splash down into the weir water. Is the pipe to come out the side or the back?
     
  13. McPikie

    McPikie Registered

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    Out of the back fella.

    so no need to run 2 pipes at all? I though it helped make it quiet and was a safety feature. Got told to run lower one underwater and have the water level just lapping into the second, higher drain
     
  14. PaulW

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    also concider what you are doing return wise, might want to drill a 3rd hole rather than have soft plumbing going over the pelliment
     
  15. Matt@Epo

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    thats true but you arent going to be moving that much water around. The pipe that is constantly submerged is in full syphon. Your tank isnt huge so your return pump will struggle to keep up, the weir will empty, gurgle and then refill via the return pump. The safety feature is an issue but there are beter ways to deal with that than drilling extra holes and having all the pipework associated with it.

    As Paul says, your far better having a hole for the return pump pipework
     
  16. McPikie

    McPikie Registered

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    I have a 2500lph return, but not sure if that is adjustable.

    Some more to add into the equation.

    Light unit hangs off the pelmet so intrudes into the tank by 40mm or so

    [​IMG]20140611_121657 by McPikie, on Flickr

    and this is the pipework I have so far, inc 4metres of 25mm pipe

    [​IMG]20140611_121932 by McPikie, on Flickr

    Now I was thinking of running this set up

    [​IMG]20140611_122311 by McPikie, on Flickr
    Left hand side is drain and right is return

    But you guys recommend this set up, drilled once on both sides, and have the return coming in under the pelmet, but pointing up at the surface?

    [​IMG]20140611_122409 by McPikie, on Flickr
     
    Last edited: Jun 11, 2014
  17. Matt@Epo

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    what return pump is it? whats the outlet size on the pump?
     
  18. McPikie

    McPikie Registered

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    Will have to go home and check. Got the enheim green pipe and stepper to get it to fit into tje 25mm return tho
     
  19. leopardshark

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    Just be careful on that true union ball valve ... Mine has the occasional drip... I often think I could use a gasket/washer inside...
     
  20. PaulW

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    ptfe tape on the threads will sort that.:)
     
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