Drain setup?

  • We are currently upgrading MFK. thanks! -neo
jandb said:
Good point there. By some napkin math I get somewhere in the 495 gallon/hour range with head height. I don't know that that's enough for a ~270 gallon tank?
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Thats.probably too low. Now keep in mind I have no idea if the math and power to gph ratio is the same for dcp.

If that info is out there Fish Tank Travis Fish Tank Travis would be the guy Id bet on being able to find it lol
 
jaws7777 said:
Thats.probably too low. Now keep in mind I have no idea if the math and power to gph ratio is the same for dcp.

If that info is out there Fish Tank Travis Fish Tank Travis would be the guy Id bet on being able to find it lol
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I agree. Yep. The calculated it based on the DCP chart. I'm sure they're both pretty close.
 
jandb said:
I agree. Yep. The calculated it based on the DCP chart. I'm sure they're both pretty close.
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This is a tough call. Seems like something is going to be sacrificed. Would maybe adding a couple of hobs or canister be an option along with the sump ?

I mean it's your tank you could swap the drains just be aware that the flood risks are present
 
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jaws7777 said:
This is a tough call. Seems like something is going to be sacrificed. Would maybe adding a couple of hobs or canister be an option along with the sump ?

I mean it's your tank you could swap the drains just be aware that the flood risks are present
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Yeah, I'm not sure. I really don't want to put any other filtration other than a powerhead in case of an outage in it. I feel pretty confident that if I really choke back the 1.5" drain as a full siphon hoping to hit around 1000 gph I'd be ok. The 3/4"s hit full siphon real quick if something were to happen.
 
I would run both 3/4” drains at full siphon with a dry/trickle 1.5” emergency drain. The cross sectional area of two 3/4” drains comes out to about .88 sq. inches total. However, the cross sectional area of one 1.5” drain comes out to about 1.75 sq. inches, which is about double. The single 1.5 will easily be able to handle way more flow than the two 3/4” drains can handle together. Therefore, I think the best option is to run both of the 3/4” drains at full siphon.

For reference, I run three 1.5” drains in my 220. I have two of them valved down a little over half way to run full siphon, and the third is me dry/trickle emergency drain. If both of 1.5” full siphon drains were to become blocked, then I have complete confidence that my third could handle the full flow.
 
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Fish Tank Travis said:
I would run both 3/4” drains at full siphon with a dry/trickle 1.5” emergency drain. The cross sectional area of two 3/4” drains comes out to about .88 sq. inches total. However, the cross sectional area of one 1.5” drain comes out to about 1.75 sq. inches, which is about double. The single 1.5 will easily be able to handle way more flow than the two 3/4” drains can handle together. Therefore, I think the best option is to run both of the 3/4” drains at full siphon.

For reference, I run three 1.5” drains in my 220. I have two of them valved down a little over half way to run full siphon, and the third is me dry/trickle emergency drain. If both of 1.5” full siphon drains were to become blocked, then I have complete confidence that my third could handle the full flow.
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Excellent idea! I would have never come up with that. Are the two full siphons the same height?
 
Yep, both of my siphon drains are the same height. The emergency drain sits about 1-2” higher.

You will be able to double your flow, but a powerhead or two will still benefit you. I run about 1600gph in my 220.
 
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