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| General Reef Discussion In this forum we discuss issues related to keeping marine and reef aquariums in a friendly flame-free environment. |
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04-30-2007, 10:14 AM
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#1
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Shark
Join Date: Nov 2005
Location: Toledo OH
Posts: 4,978
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Internal vs HOB overflow
OK so right now a buddy has a HOB overflow with 2 1.5" drains.
We set up a return sump pump with the PCX-70 (1500gph max) probably netting ~1100gph considering the head and penductors.
Needless to say the HOB can't keep up. We have the pump cut back to about 60% flow and it is doing fine.
We now plan to drill the back of the tank for two BH's to make an internal overflow setup. Will two 1" BH's cut it? Try to keep this small for room yet working properly.
I know on my tank with an internal overflow I ran ~ 800GPH through a 1" overflow w/o issus. So want to see of anyone has ran 2 1" overflow with about 1200-1300 GPH and worked out fine.
I am assuming the HOB just can flow like an internal overflow. Siphgon vs gravity.
Really don't want to do 2 1.5" BH's
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__________________
They are all gone!  NOW Planning 150g+ 
TIM MADE ME DO IT, Yet Robert made him do it, yet Casey made him do it!
Yet the voices in all their heads made them do it (skeety)
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04-30-2007, 10:21 AM
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#2
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Shark
Join Date: Nov 2005
Location: Toledo OH
Posts: 4,978
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His overflow also was keeping up with a Rio 3100 (800Gph) and a mag 9.5(950gph)
These pumps had maybe 5' of head each. I would guess a total of maybe 1000gph?? maybe it was more like 800gph?
Definitly can see the power of the Gen X opposed to the mag or Rio
__________________
They are all gone! NOW Planning 150g+
TIM MADE ME DO IT, Yet Robert made him do it, yet Casey made him do it!
Yet the voices in all their heads made them do it (skeety)
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04-30-2007, 10:45 AM
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#3
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Ghost of reefers past
Join Date: Jan 1999
Location: Southern Oregon, Way West of Dimples ;)
Posts: 25,137
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What kind of overflow is he using, 2x1.5 drains ought to keep up with that pump
Drilling is good, but I would be leary of 2 1" drains, adding stockman or durso mods to quiet 1000+ flowrate may be problematic
__________________
Cowboy is a verb, not a noun
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04-30-2007, 10:52 AM
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#4
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Shark
Join Date: Nov 2005
Location: Toledo OH
Posts: 4,978
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They are just typical U-tube style overflows. One box w/ 2 tubes. Maybe they are 1"?? I guess well check to vefiy for sure.
Noise shouldn't be and issue as the tank is in wall. I had the 1" durso and it handle 800gph fine.
__________________
They are all gone! NOW Planning 150g+
TIM MADE ME DO IT, Yet Robert made him do it, yet Casey made him do it!
Yet the voices in all their heads made them do it (skeety)
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04-30-2007, 10:59 AM
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#5
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Ghost of reefers past
Join Date: Jan 1999
Location: Southern Oregon, Way West of Dimples ;)
Posts: 25,137
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Hmmmmmmmmm if they are 1" siphon tubes feeding 1.5 drains, that could be a problem  Since the tank is in wall, just plumb it and letter rip 
__________________
Cowboy is a verb, not a noun
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04-30-2007, 10:59 AM
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#6
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Shark
Join Date: Nov 2005
Location: Toledo OH
Posts: 4,978
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Another thing is I plan this to be a c2c overflow so I guess if the two 1" BH's don't cut it a third could be added.
__________________
They are all gone! NOW Planning 150g+
TIM MADE ME DO IT, Yet Robert made him do it, yet Casey made him do it!
Yet the voices in all their heads made them do it (skeety)
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04-30-2007, 11:06 AM
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#7
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Rogue Water is Trouble!
Join Date: Jul 2006
Location: Upstate, NY
Posts: 2,911
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Can I ask a stupid question and maybe I should put this under its own heading but...
Why is everyone so interested in getting water in and out of the sump so quickly. Isn't it even a little better to slow down that rate of return so that the skimmer can actually do its job? Won't the skimmer take more out of the water if it is not rushing so quickly through the sump?
Am I all wet?
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04-30-2007, 11:12 AM
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#8
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Shark
Join Date: Nov 2005
Location: Toledo OH
Posts: 4,978
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Quote:
Originally Posted by frankandmaura
Can I ask a stupid question and maybe I should put this under its own heading but...
Why is everyone so interested in getting water in and out of the sump so quickly. Isn't it even a little better to slow down that rate of return so that the skimmer can actually do its job? Won't the skimmer take more out of the water if it is not rushing so quickly through the sump?
Am I all wet?
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Yes slowing the flow through the sump is good. But 1100gph through a sump on a 150 gallon isn't crazy overkill.
Yes 800 would be better but I am trying to get lots of flow in the tank w/o PH's & CLS. With this pump and educators we are going to net about 2500-3000gph out of ONE pump! Plus keeping a relative decent flow through the sump(1100gph). Now 2500-3000GPH through the sump would be crazy!
__________________
They are all gone! NOW Planning 150g+
TIM MADE ME DO IT, Yet Robert made him do it, yet Casey made him do it!
Yet the voices in all their heads made them do it (skeety)
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04-30-2007, 11:13 AM
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#9
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Ghost of reefers past
Join Date: Jan 1999
Location: Southern Oregon, Way West of Dimples ;)
Posts: 25,137
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Quote:
Originally Posted by frankandmaura
Can I ask a stupid question and maybe I should put this under its own heading but...
Why is everyone so interested in getting water in and out of the sump so quickly. Isn't it even a little better to slow down that rate of return so that the skimmer can actually do its job? Won't the skimmer take more out of the water if it is not rushing so quickly through the sump?
Am I all wet?
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No its a valid point, personally I like a thru rate no more than what the skimmer can actually process. Slower sump velocities create less noise, and splash issues, don't require such big power hungry return pumps. Actually my next setup will prolly have the water going thru at half the skimmers feedrate.
Circulation is better dealt with in other ways , ie CLS, or switching setup,etc
__________________
Cowboy is a verb, not a noun
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04-30-2007, 11:17 AM
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#10
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Rogue Water is Trouble!
Join Date: Jul 2006
Location: Upstate, NY
Posts: 2,911
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Thanks Doug...I have been discussing this with a friend lately and we cannot figure out the benefit of getting the water in and out of the sump so quickly...other than flow...
Sorry, not trying to steal the thread, just something on my mind.
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