400+ gallon plumbing questions

  • We are currently upgrading MFK. thanks! -neo
bonesb66 said:
You do realise the lower drain pipe will take all the flow?

Is this what you intended? the lower pipe is the 2" and the higher one is the 1.5" as back up?

It looks perfectly fine if so - i have my tank set up in a similar manner
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Yes. That's the whole idea as was stated in the OP. If the 2" runs at a full siphon it is 100% silent. the 1.5" is meant to handle a small amount of flow that the 2" cannot -- enough to be near silent by maintaining a column of air in the pipe. The other 1.5" would be the emergency pipe if a pipe were to clog.
 
I have (2) 1 1/2" drains teed to a 2" line and gate on my 300 draining 2500 gph and my gate is only about 10% open.

It could handle 2 to 3 times what throwing at it with ease. You should be fine if you run it all full siphon.


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Jc1119 said:
I have (2) 1 1/2" drains teed to a 2" line and gate on my 300 draining 2500 gph and my gate is only about 10% open.

It could handle 2 to 3 times what throwing at it with ease. You should be fine if you run it all full siphon.
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Sorry my plumbing lingo is a little lacking. Do you mean that you have two 1.5" lines feeding into one 2" line, and that 2" line is only open 10%?
 
Not sure if this helps at all but I've done things like fill up the overflow chamber with bio balls if the pipe is low, as this mutes the waterfall a bit (has to fall through all those bio balls so less distance) and creates a little mini wet-dry chamber. Of course if you're doing this you'll need a grate on the pipe so that it doesn't get clogged with a ball.
 
Psylant said:
Sorry my plumbing lingo is a little lacking. Do you mean that you have two 1.5" lines feeding into one 2" line, and that 2" line is only open 10%?
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Exactly. It's the sump setup in the 300 in my signature. 2" line can handle ALOT of flow

I'm running dual Herbies and its easier to adjust one gate than 2.


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Mount_Prion said:
Not sure if this helps at all but I've done things like fill up the overflow chamber with bio balls if the pipe is low, as this mutes the waterfall a bit (has to fall through all those bio balls so less distance) and creates a little mini wet-dry chamber. Of course if you're doing this you'll need a grate on the pipe so that it doesn't get clogged with a ball.
Click to expand...

I feel like this would help, but get really messy and require a lot of maintenance. Might be worth looking into though. Thanks.
 
Jc1119 said:
Exactly. It's the sump setup in the 300 in my signature. 2" line can handle ALOT of flow

I'm running dual Herbies and its easier to adjust one gate than 2.
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I think I've looked through that thread before but wasn't paying as much attention as I will now. I will check this out when I get home. I'm about to leave work for the day. Thanks for the clarification!

I've read that gravity fed 2" PVC can do 3300gph if there are no fitting or bends. More realistically 2500-2800gph.
 
Jc1119 said:
http://www.beananimal.com/projects/silent-and-fail-safe-aquarium-overflow-system.aspx

As you can see here, Bean himself is moving 2000gph through 1" drains at full siphon.
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I think that's a 1" bulkhead and 1.5" drains. I learned that if the discharge of the drain is below water level in the sump, that these numbers are very, very low that I was saying earlier. Check this link out. This is using the BULKHEAD size, and assuming a full siphon with the discharge below water level in the sump.... but it seems a 1.5" bulkhead at full siphon is all I'd require for the siphon portion.

http://www.beananimal.com/articles/hydraulics-for-the-aquarist.aspx
 
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