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Old 09-12-2005, 11:47 AM   #1
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Max flow rate thru a 1.5" drain is...??

I'm setting up my 120 soon and would like about 1800 gph flow. Considering "reef ready" tanks come with a 1.5" drain hole in the bottom, how much flow can this size hole deliver?

Seems to me that if I get a pump capable of returning 1800 gph, what good is it if my 1.5" incoming flow can't feed the pump?
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Old 09-14-2005, 01:46 PM   #2
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Can anybody anser this for me?? Can I get a 1.5" drain to feed 1800-2000 gph?
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Old 09-14-2005, 01:51 PM   #3
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http://reefcentral.com/calc/drain.php
short answer.. maybe..
1.75 inches is recomended for 1800gph..
but could you do it with say a adjustable durso standpipe creating a little more syphon.. theres a good you might be able to do it..
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Old 09-14-2005, 02:05 PM   #4
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I have a Oceanic stock 120 RR tank. I'm running a mag12 with an 18 impeller, which from what I'm to understand brings my pump output to somewhere around 1500. That's probably netting close to 1200gph after head loss from height and elbows/Ts. I have a tunze in tank for additional flow.

I'm in the North East and need a chiller due to the mag12 in the sump. I'd go with an external next time.

Also you could use a pressure rated pump and eductors/penductors (I think MyReefCreations makes penductors?) to increase the flow without increasing the throughput. A strange concept, but I've seen it in action and it is amazing.
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Old 09-14-2005, 02:10 PM   #5
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Quote:
Originally Posted by Phyl
Also you could use a pressure rated pump and eductors/penductors (I think MyReefCreations makes penductors?) to increase the flow without increasing the throughput. A strange concept, but I've seen it in action and it is amazing.
Do know were I could look for information on eductors/peductors?
The consept sounds very intresting. :P TIA
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Old 09-14-2005, 03:57 PM   #6
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You could use the return hole as a second drain or set up a closed loop with a second pump. I heard Anthony Calfo comment once that the so called reef ready tanks are kind of a misnomer. The flow that really is needed would require a lot more holes
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Old 09-14-2005, 05:49 PM   #7
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Quote:
The flow that really is needed would require a lot more holes
That's if you wanted all of your tank flow through your sump. That isn't good for your skimmer as the water would be moving too fast to get a good skim on it. Better to have some sort of closed loop/in tank PH for additional flow.

Quote:
Do know were I could look for information on eductors/peductors?
http://filterpump.com/pdfs/products/112.pdf
http://themantledmonster.thereeftank.com/ediy.html
http://www.kthsales.com/website/Misc...nthusiasts.htm

Hope some of those help!
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Old 09-14-2005, 06:54 PM   #8
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I would love more flow than what my reef ready tank can support. I don't think 1800 would be too much. I hope mine is running 700-800
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Old 09-14-2005, 07:17 PM   #9
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Phyllis.. so they make something like a jet of water inside the line using the water preasure in the line..creating more flow?
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Old 09-14-2005, 09:50 PM   #10
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Yes. It creates a jet of water flow coming out of the penductor, though honestly I don't understand the mechanics of it. I have seen it in action though! It will work with a flow pump but not as well as with a pressure pump, from what I've read. This means that the mag pumps are not as good pump to use as say an Iwaki.
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