Drainage GPH question

[vince-1961]

What is the maximum GPH for a single 1.5" ID pipe drain?
(powered only by Mother Earth's gravity)

 

[patriot54]

How much volume of water are we talking about?

 

[natclanwy]

It should be about 1500gph

 

[vince-1961]

Patriot, that is exactly what I am asking.
I want to re-power my sump with a much larger capacity pump. Since I am not particularly fond of the idea of pumping a bunch of water over the top edge of the aquarium onto the floor, I got to make sure the capacity of the pump does not exceed the capacity of the tank to drain. The tank has two 1.5" ID drains.
According to Nat's answer, the drainage capacity of my tank would be 3,000 GPH (1,500 x 2).
PS- Nat, what's the capacity of 1" ID?

 

[natclanwy]

1" drain is 600gph, both of these rates are under gravity alone and the drain tubing needs to be pretty much verticle, any horizontal runs will reduce the maximum amount.
Just out of curiosity why are you wanting to increase your flowrate through the sump?

 

[locoyo386]

Hi there,
If it is pure gravity feed and completely vertical (no u-shapes) and it is inside diameter, than the flow should be around 1300 gph.

 

[jojo727]

i hope this helps
Flow Chart
1/2 " PVC
3.5 GPM
210 GPH
3/4" PVC
6 GPM
360 GPH
1" PVC
10 GPM
600 GPH
1 1/4" PVC
20 GPM
1,200 GPH
1 1/2" PVC
30 GPM
1,800 GPH
2" PVC
60 GPM
3,600 GPH
2 1/2" PVC
100 GPM
6,000 GPH
3" PVC
175 GPM
10,500 GPH
This is for drain volume. On the return side, the pipe will restrict it a bit but basically, it's the pumping capacity of the pump.