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lily pipe diameter problem?

Discussion in 'General Plant Topics' started by Omegatron, Sep 12, 2013.

  1. Omegatron

    Omegatron Guru Class Expert

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    Hi,

    I have 2 filters running on my tank, one filter tubing needs a 13mm inflow/outflow lilypipe and the other a 17mm inflow/outflow lilypipe.

    if i use a hose adapter converting the 17mm tube to a 13mm tube (converting it close to the filter not near the lilypipe) will this decrease the outflow of my filter by a lot? and is it bad for the filter?

    my tank is 170 liters (around 43 gallon)

    I use:
    1x Eheim 2071 950 liters (250 gallon) per hour 17mm tubing
    1x Eheim 2036 750 liters (198 gallon) per hour 13mm tubing

    The reason for this question is because the lenght of the inflow lily pipe for a 17mm tubing is around 30cm long while for the 13mm this size is only 23cm. My tank is 35cm high so the 17mm version would end up in the substrate.

    thats why really want 2x 13mm versions of lilypipes.

    thanks!
     
  2. Tom Barr

    Tom Barr Founder
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    For the cost, you might contact a glass blower locally and they can make bends in glass pipe quite easily.
     
  3. Omegatron

    Omegatron Guru Class Expert

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    thats true but i wanted to go for 2 pairs of fleabay craftsmanship.

    would the 13mm diameter be ok for a 17 mm filter though?
     
    #3 Omegatron, Sep 13, 2013
    Last edited by a moderator: Sep 13, 2013
  4. PK1

    PK1 Guru Class Expert

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    It's an easy math, if you calculate the area you'd find out that the 13 mm tube has nearly half the area of that of the 17 mm tube. So, yes, it would create a bottleneck and I wouldn't do it.
     
  5. Omegatron

    Omegatron Guru Class Expert

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    ok thanks!
     
  6. Matt F.

    Matt F. Lifetime Charter Member
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    I run a reduced ID/OD tubing out of my Eheim 2217. I had an Eheim 2215 and bought the Lily Pipes that fit my tank. when I upgraded to the Eheim 2217, I had to convert the tubing. There is no problem doing this.

    Here is from my journal thread at another site:

    Doesn't look like Drs F&S has one for 5/8"---->1/2" (16/22mm x 12x16mm). That would be nice. There is a pond person who sells them...

    http://www.pondparts.com/prod242.html
     
  7. Omegatron

    Omegatron Guru Class Expert

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    Hi Matt,

    i was in my LFS last week, this is the place where i also bought the 2 filters. They told me that the one with 16/22 mm tubing using the same rotors/motors as the versions with 12/16mm. i shouldnt be a problem at all.

    Havent decided what to do but i think im going to give it a try with 12/16mm tubes.

    thanks for your help.
     
  8. Matt F.

    Matt F. Lifetime Charter Member
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    That's what I did. The filter has been running w/o issue for years. I'd say go for it!

     
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