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Drain sizing

Vhuang168

Vhuang168

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The holes in the overflow are drilled for 1" bulkheads. There is no room to go any bigger, the overflow already has 5 holes in it.

The sump came with 1.5" bulkheads.

I will be running a Bean Animal / Herbie style drain.

Any problems running 1.5" from the 1" bulkheads all the way to the sump?

Or even 1.25" the whole way from inside overflow box, adapting the 1" bulkheads then 1.25" to the sump?

Or just run 1" all the way to the sump and adapt it to the 1.5" bulkheads in the sump?

I will be using a Red Dragon 3 80w DC return which is rated at 2113gph. I think 1" drains can max out at 2000gph so technically running 1" should be enough.

Thoughts?
 
If you are doing herbie, then you'll have a valve of some sort of valve right before the sump input right? So the effect of draining water faster than intake can provide would be minimal (noise issue).
1" bulkhead -> 1" pipe -> gate valve -> adapter -> 1.5" sump bulkhead?

Just pondering out loud.
 
I would run either 1.25 or 1.5 from the 1" bulkhead to the sump, whatever is easier to plumb. If you run this as a herbie/bean animal, you're going to be throttling the 1" drain anyway (I would guess). Generally the flow restriction is more about the return lines and the head loss on the pump, but those Red Dragon pumps are supposed to be excellent.

If there are 5x 1" holes in the overflow, you could run a bean animal with two 1" returns and 3x 1" drains which would be silent and safe, I would imagine.

I ran a Jebao DCS-12000 on our 90gal which flowed 2300gph max/ideal, but I only had a single 3/4" return line so there was a lot more head/pressure loss and I would guess our 1" siphon drain in our herbie setup was throttled to 50% or so with the gate valve. It was totally silent, but the 1" siphon drain could flow way more than the return could pump. Your mileage may vary, but that was my experience.
 
So I decided to run 1.25" drains from the 1" drain bulkheads to the 1.5" sump bulkheads. The returns are 3/4" bulkheads but the sump return bulkhead is 1". So I'll run 1" to the split then to 2 3/4" returns. This should allow me to maximize my return flow if I choose to do so.


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