overflow

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fote03

Candiru
MFK Member
Sep 4, 2006
252
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46
Gainesville, Florida
I have a 180 that is drill in both back and runs 1.5 pvc to the sump. I was wondering how much water does it move? And what size a brand pump people would recommend?
 
if 1" flows approx 600gph then 1.5" would flow more like 1350gph if u go by the area inside the piping. u also have to consider the gravity factor. the farther down it flows the more pressure there will be and the more it will flow.
 
Zennz said:
I have been using QuietOne pump for over a year now with no problems...
Depending on the height of your tank from the filter, a 4000 or 6000 will probably fit the bill.
http://www.drsfostersmith.com/Produc...&N=2004+113041

Based on a 1.5" overflow flowing 1400GPH,
and an average friction loss from 4ft of head and appliances,
I'd go with the model 6000 QuietOne

6000.JPG
 
bukster;755969; said:
if 1" flows approx 600gph then 1.5" would flow more like 1350gph if u go by the area inside the piping.

remember you still have to multiply by pi2. not just radius.
 
This 600 gph figure keeps popping up but I have yet to see anyone to post their actual experience with it. It would be grand if it would flow this much because I have a 250g that needs new bulkheads. The original manufacturer went under and I am faced with using one inch plumbing or redrilling the tank bottom. The tank weighs 367 pounds when dry, so moving it around to drill it is not in the game plan. So I did a flow test. The highest flow in one inch plumbing that I could get under gravity (and a 1.5 inch stand pipe) was
337 gph. Btw, the larger stand pipe will feed more water to the one inch plumbing. Using a one inch stand pipe will lower the flow rate considerably.

In conclusion, I am led to believe that this 600 gph figure that has been passing around has been only a wild guess.
 
CHOMPERS;756380; said:
This 600 gph figure keeps popping up but I have yet to see anyone to post their actual experience with it. It would be grand if it would flow this much because I have a 250g that needs new bulkheads. The original manufacturer went under and I am faced with using one inch plumbing or redrilling the tank bottom. The tank weighs 367 pounds when dry, so moving it around to drill it is not in the game plan. So I did a flow test. The highest flow in one inch plumbing that I could get under gravity (and a 1.5 inch stand pipe) was
337 gph. Btw, the larger stand pipe will feed more water to the one inch plumbing. Using a one inch stand pipe will lower the flow rate considerably.

In conclusion, I am led to believe that this 600 gph figure that has been passing around has been only a wild guess.
You are right in the fact I never have done an actualflow test like you have...
I am basing the overflow rates that are commonly advertised I.E. 600gph and 1400gph for 1" and 1.5"
Interesting you have got barley over one half that...things that make you go hmmmm:irked:
 
Yeah, I know. I am going to repeat the test with a two inch stand pipe to see if I can get more pressure on the one inch portion. I am also going to see if two stand pipes will get more water (and less air) to flow to it. But I can see it now that I will never reach 600 gph.

There is really no limit what a one inch pipe will flow (as long as you have a big enough pump). But in a gravity feed situation like on fish tanks, we are limited by the height of the tank and stand. The force of gravity is 32.2 ft/sec^2 or 9.81 m/s^2. That does not leave us with much force in a four or five foot setup.
 
CHOMPERS;756463; said:
Yeah, I know. I am going to repeat the test with a two inch stand pipe to see if I can get more pressure on the one inch portion. I am also going to see if two stand pipes will get more water (and less air) to flow to it. But I can see it now that I will never reach 600 gph.

There is really no limit what a one inch pipe will flow (as long as you have a big enough pump). But in a gravity feed situation like on fish tanks, we are limited by the height of the tank and stand. The force of gravity is 32.2 ft/sec^2 or 9.81 m/s^2. That does not leave us with much force in a four or five foot setup.
I been entertaining the thought of pumping to the filter and upping my return pump size on the 150g...
 
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