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Old 01-14-2011, 01:42 PM   #1
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gph for overflow siphon??????

i have just built a sump for my 55 and a DIY pvc overflow. im wondering what is the gph my overflow will put out if its made with 3/4" pvc??? my return pump puts out 581 gph. am i correct in assuming the gph between the pump and the siphon have to be similar???? everythings built i just have to put it together and i have ball valves in line to adjust flow where needed on either end. thanks!
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Old 01-14-2011, 01:47 PM   #2
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I think a 3/4 overflow is around 600gph,you have to allow for the head the pump needs to pump as well which will drop the rate down slightly.
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Old 01-14-2011, 01:54 PM   #3
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so you think with the flow fully open i should be ok????
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Old 01-14-2011, 02:21 PM   #4
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I would think so but you could plumb a Tee into your return and plumb back into your sump with a valve on it so you can easily adjust the flow just to be on the safe side.
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Old 01-14-2011, 10:35 PM   #5
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would i put the tee before or after the valve. im assuming before right?

edit.
never mind i think i got it... would it go:
pump >>tee>>
>>route 1:tank
>>route 2: valve>>sump
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Old 01-14-2011, 10:41 PM   #6
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if 600gph overflow and 581gph return, IMO its not enough...its due to the head loss...
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Old 01-14-2011, 10:58 PM   #7
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Originally Posted by abdhalim View Post
if 600gph overflow and 581gph return, IMO its not enough...its due to the head loss...
im sorry im not familliar with the term "head loss". im new to the whole sump thing. thanks for everyones patience
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Old 01-14-2011, 11:01 PM   #8
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its depends on how many Tee or L pipe/elbow from your return to your tank.....here is the link to calculate about it...its from Mr X before....
http://www.reefcentral.com/calc/hlc2.php
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Old 01-15-2011, 12:32 AM   #9
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Originally Posted by mistermismatch View Post
im sorry im not familliar with the term "head loss". im new to the whole sump thing. thanks for everyones patience
Your pump is rated at 581gph. As the water travels through the pump upwards, that number will decline for every foot in which it travels.

If it takes 4 feet to go from your sump on the floor up to the top of your tank, that that is a 4 FOOT HEAD LOSS. you have to calculate how much water is being pushed after the four feet. so after 4 feet it might only be pumping out something like 420gph (did not do the math).

The GPH will also decrease for every turn, ball valve and check valve you add.
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Old 01-15-2011, 05:48 AM   #10
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Ok,The 3/4 pipework will work with the return pump you have because of headloss and restristions others have pointed out.
Here is a quick example of the valve i was talking about.
http://www.aquariumadvice.com/forums...icture8406.png

I think you should upgrade your overflow to 1 1/4 pipe to get you over 800gph and then upgrade your pump.
But if money is tight htan what you have got will do
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