tank filled but problem with flow

[reefster316]

So i filled my 210 and turned on pump.i have a 755 gph submerged pump. the pump seems to pump more water than is being drained. the pump became exposed to air so i added water to my sump tank and about overflowed my D.T. could this be due to my overflow setup? any help would be greatly appreciated.

[sandwi54]

What are the size of your drains? Dual overflow? Any standpipe?

[reefster316]

Dual drains one inch. it is a drilled tank with two overflow chambers inside. i made my overflow kit myself, bulkhead 25" pvc then tee with cap on top, drilled hole in top to break suction . on the side i put a elbow down into water and very short length of pipe.

[reefster316]

Also the hole i put in the cap to break siphon is about a inch or so above normal water level

[Danzig]

Did you say your bulkheads were 2.5'' ? If so, you should NOT reduce them. If you drilled your tank for 2.5'' plumbing, use 2.5'' plumbing all the way, do not reduce it will effect how it works.

[uncleof6]

You need larger pipe for you standpipes and drains. A 1" open channel standpipe (those with a hole in the top better known as "Dursos" will handle less ~ 50 gph or so, before it starts giving you troubles. Compared to well over 1500 gph for a 1" siphon. The smallest practical open channel standpipe/drain line, is 1.25", and that is a rather low flow rate as well. There is a great deal of info on drain systems in the DIY section, as efficient drains are strictly DIY.

[reefster316]

Ok so my bulkhead is 1 ". are you saying i need 1 1/4 in my tank chamber then reduce at bulkhead? not sure what you are saying about the different siphon setups, can't find any in the diy

[seapug]

Your problem is definitely related to the capacity of your drain. It could be a simple fix or something more complicated. Can you post a photo of your DIY standpipe/drain?

[reefster316]

I found a similar setup on line and i have to use a 1" to 1 1/4" adapter and 1 1/4 rise pipe, should solve problem. thanks all for the comments.

[Chris27]

Something sounds a little off here, dual 1" drains should have no problem keeping up with a single 755 Gal / Hr pump...durso or not.

Is that flow rating at 0' head, or at 5' head?

Post up a picture or describe the setup a little better, likely it's something simple like not having enough water in the system.

[reefster316]

Its at zero head pressure. i have my tee right at the top of overflow box with a elbow off that pointing down into box then a small pie of pipe. so openings are around two inches below top of box. hole in the cap is around 5/16. and sticks up a inch above tank. i added water to my sumptuous to cover the pump and looked in my d.t. and the water was about to crest, so i drain a few gallons

[uncleof6]

Originally Posted by Chris27

Something sounds a little off here, dual 1" drains should have no problem keeping up with a single 755 Gal / Hr pump...durso or not.

Is that flow rating at 0' head, or at 5' head?

Post up a picture or describe the setup a little better, likely it's something simple like not having enough water in the system.

The two 1" open channel capacity is probably around 100 gph on a good day. Capacity of the pipe itself is far greater, but the dynamics of these things are at best erratic, unless the flow rates are kept way down. The problem is definitely the drain capacity.

If the tank fills up, to just about overflow, the drains are not working. The OP mentioned that when the pump ran dry, he added more water to the system........

[nlgill13]

The two 1" open channel capacity is probably around 100 gph on a good day

what? 1" diameter pipes can drain 600gph in a flash, I have a single 1" drain on my 90g w/ a just over 600gph coming from return pump. This setup should work fine. In fact you might be over-draining the system (which would lead to a dry overflow and an overflowing sump). I would think that the overflows will only be able drain the same amount as the flow rate of the pump (thus being 300gph or so apiece)

You will have to use a smaller hole size on a durso pipe to get the correct flowrate through the drains (so it doesn't gargle) but their should be no problems with the system draining +600gph, unless you have to many restrictions (like clogs, 180 degree turns, or a huge headloss)

[uncleof6]

Originally Posted by nlgill13

what? 1" diameter pipes can drain 600gph in a flash, I have a single 1" drain on my 90g w/ a just over 600gph coming from return pump. This setup should work fine. In fact you might be over-draining the system (which would lead to a dry overflow and an overflowing sump). I would think that the overflows will only be able drain the same amount as the flow rate of the pump (thus being 300gph or so apiece)

You will have to use a smaller hole size on a durso pipe to get the correct flowrate through the drains (so it doesn't gargle) but their should be no problems with the system draining +600gph, unless you have to many restrictions (like clogs, 180 degree turns, or a huge headloss)

You cannot over drain a system. What goes out equals what goes in. Where it goes, whether down the drain or over the sides of the tank, depends on the drain capacity, and how well the drains work.

Durso's are never stable, never quiet, never reliable unless the flow rates are well below the "published this is how much it handles" flow rates.

The OP has a drain capacity problem.

The size of the hole is elusive, and no one can say what size it needs to be. It is system dependent, never the same between two systems.

The inventor of the Durso, says the smallest practical size durso is 1.25," except for an extremely low flow system.

I am willing to say, that if the OP cuts the return flow way down, the problem will disappear--unless the drain lines are plugged.

Yes a 1" pipe can drain 600 gallons in a flash, it can drain 1500 and more in a flash. However a 1" durso stand pipe can't, not without creating a problem or two. I hear it all the time, it works fine, however, I suspect the flow rates are somewhat lower than guessed at.

[hvacman250]

You definately have a weird problem. I have a standard 210 with dual 1" bulkheads running 1.5" dursos (from factory this way) I am returning over 2000 gph to the tank and the drains have been draining fine over 8 months.

[reefster316]

So i changed my pipes to 1 1/4" lowered the elbow two inches below overflow box top and its working great maintaining constant level in both d.t. and sump . at first the hole in cap was too small and water level was up and down in overflow box with alt of gurgling. i drilled bigger and now its fine, although i would like to see the water level a little lower on the tee, so i may get new caps and drill just slightly smaller hole. the hole seams to be a very important part or this setup. again thanks fir all the help. i will post pictures of my setup tomorrow