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View Full Version : Matching gph overflow/return pump


Offalmangler
12/24/2011, 04:27 PM
Would this work?

I have a aquabee 6000 return pump. From what it says, it flows 6000 litres per hour. Which works out to about 1500 gph give or take.

Being Christmas, the kids bled me dry so I can't purchase a overflow box.

So I made a DIY overflow from PVC pipe. I used 3/4 inch size. Being the tool i am. And with the crowds. I neglected to take into consideration the gph.

Would a 3/4 inch pipe work, or would it flow too little to the sump, and be grossly outmatched by my return pump and flood my display?

If so. Would 2 of these overflows work or what size pipe should I be looking at?

cherubfish pair
12/24/2011, 06:15 PM
With the drain/overflow calculator on RC's homepage, half your pump output or 800 gph would require a 1.17 inch diameter drainpipe. Two 1.25 inch pipes would do it or three one inch pipes.

moondoggy4
12/24/2011, 07:51 PM
Are you trying to put a pump in the main tank and pump to the sump and another pump from the sump to the display tank?

Offalmangler
12/24/2011, 09:03 PM
No, gravity overflow to the sump, through my new skimmer "that's been sitting in a box for 2 weeks!!" then to my return pump to my tank.

So I guess I will be picking up either another 3/4 pipe and fittings and having duel drains or one 1.50 pipe and going that route. I hate to waste what I bought and made already.

If into another 3/4 pipe I can always T-off my return with a gate valve to my sump to regulate output flow without restricting my pump.

Harriscli
12/24/2011, 09:37 PM
I would be nervous about that. I would always rather have more drain potential then return potential. That way even if I got a slight clog the amount drained would be dependent on what my return pushed out.

Best example is going with a 600 GPH return with drains that would support up to 750 or 800 GPH. I get flow through a closed loop system.

wildman926
12/25/2011, 08:39 AM
I would be nervous about that. I would always rather have more drain potential then return potential. That way even if I got a slight clog the amount drained would be dependent on what my return pushed out.

x2 Put a valve on the output of the pump, and slow the flow down.

toddmartin
12/25/2011, 12:42 PM
So I guess I will be picking up either another 3/4 pipe and fittings and having duel drains or one 1.50 pipe and going that route.

One 1 1/2" pipe will have way more capacity than two 3/4" pipes.

RubberFrog
12/25/2011, 04:30 PM
^ this

Do your high school geometry.

Telaverus
12/25/2011, 04:41 PM
If you are draining using your skimmer then aren't you pumping water out of the tank and then pumping water back up to the tank? If so, this isn't good as the pumps won't be in unisen and one will outperform the other causing a flood.

Or am I misunderstanding what you are doing?

rogergolf66
12/25/2011, 07:02 PM
Look up herbie over flow method not only will the drain handle more water it will be silent

bishop40k
12/25/2011, 07:20 PM
3/4 would be drastically small for that pump, and even throttled down, you'll be throwing well over 1/2 your return pump's water flow back into the sump. You could run the 3/4 for now and throttle the return for the short term, but I'd seriously upgrading your overflow piping.

I don't see mention of tank or sump size, this isn't a HUGE concern, but 1500 gph would be serious numbers on a smaller tank and can cause problems if you're throwing too much water around in a small sump.

Herbie method is just for drilled "Reef Ready" tanks IIRC.

Offalmangler
12/25/2011, 08:04 PM
It's a 150 gallon tank. I am picking up 20'feet of PVC piping and joints tomorrow.