diy overflow
- Thread starter eh1421
- Start date
You don't. You want the overflow to be able to handle more water than what your pump is returning to the tank.
In example:
I made 1" pipe overflows this weekend. I tried using one of them with my eheim pump and it couldn't keep up. The eheim rates at 37 liters per minute which equates to roughly 590-600 gallons per hour.
If 1" pvc schedule 40 pipe is rated at 600 gallons per hour max flow, in theory it should be able to handle the pump output. The overflow has 6 90s and 1 T which is essentially another 90 in how it's being used. The overflow as connected via standard pool hose which has an inner diameter of about 1" or so. That was connected to the overflow then to the 90 on the sump. The reduction in flow from those fittings was significant enough to reduce the flow rate of the 1" pipe to in my estimation 25-45 gph.
Here's the things you need to consider to build one 210 gph. I advise against it, but if you must learn that it's not a good idea on your own I understand.
Flow rate of pipe used.
Flow reduction of each fitting used (6 90s and 1 T bare minimum)
Flow reduction at entry to the overflow (surface tension, air gulping, etc.)
That's the bare minimum. There's more to it, but that'll get you started.
In example:
I made 1" pipe overflows this weekend. I tried using one of them with my eheim pump and it couldn't keep up. The eheim rates at 37 liters per minute which equates to roughly 590-600 gallons per hour.
If 1" pvc schedule 40 pipe is rated at 600 gallons per hour max flow, in theory it should be able to handle the pump output. The overflow has 6 90s and 1 T which is essentially another 90 in how it's being used. The overflow as connected via standard pool hose which has an inner diameter of about 1" or so. That was connected to the overflow then to the 90 on the sump. The reduction in flow from those fittings was significant enough to reduce the flow rate of the 1" pipe to in my estimation 25-45 gph.
Here's the things you need to consider to build one 210 gph. I advise against it, but if you must learn that it's not a good idea on your own I understand.
Flow rate of pipe used.
Flow reduction of each fitting used (6 90s and 1 T bare minimum)
Flow reduction at entry to the overflow (surface tension, air gulping, etc.)
That's the bare minimum. There's more to it, but that'll get you started.
You're missing the point. You don't want to limit it to what the pump is putting out. If it can barely handle what the pump is putting out, then if something partially blocks it your tank will overflow.
My question is why are you wanting to limit it?
My question is why are you wanting to limit it?
ugh, im so confused D:
I thought you meant that you should even out how much the overflow is pulling out to what the pump is pushing in. Ok, so to get this straight, a 1 inch pvc overflow will handle pumps up to as about 600gph.
what i want to get is the quiet one 1200 and with the height of the tank, the flow will only be about 200-225 gph.
Ok, am i right about this then:
Say i put the intake at around 1/2 inch under the top rim (where i want it) so then the overflow would take as much water was over there from the pump pushing it in. Then when it has pulled out too much water, since the overflow can do 600gph while the pump only 210, the overflow stops working because the water level is below the intake. But then, when the 210 gph pump has pumped enough water to fill up the tank a bit, water will start going down the overflow.
Was i close to how an overflow works?
My other question is that how does an overflow start again after it has stopped. Say this scenario xD
the power goes out, the pump does not pump up water anymore so then the overflow pulls out as much water as it can before the water level gets before the intake. Then, power goes back on, the pump pushes up the water so the overflow starts working again. But how does that happen? So i guess my question is how does the water start to get pumped out again if there is no more suction.
p.s. i am a bit needy arent i
I thought you meant that you should even out how much the overflow is pulling out to what the pump is pushing in. Ok, so to get this straight, a 1 inch pvc overflow will handle pumps up to as about 600gph.
what i want to get is the quiet one 1200 and with the height of the tank, the flow will only be about 200-225 gph.
Ok, am i right about this then:
Say i put the intake at around 1/2 inch under the top rim (where i want it) so then the overflow would take as much water was over there from the pump pushing it in. Then when it has pulled out too much water, since the overflow can do 600gph while the pump only 210, the overflow stops working because the water level is below the intake. But then, when the 210 gph pump has pumped enough water to fill up the tank a bit, water will start going down the overflow.
Was i close to how an overflow works?
My other question is that how does an overflow start again after it has stopped. Say this scenario xD
the power goes out, the pump does not pump up water anymore so then the overflow pulls out as much water as it can before the water level gets before the intake. Then, power goes back on, the pump pushes up the water so the overflow starts working again. But how does that happen? So i guess my question is how does the water start to get pumped out again if there is no more suction.
p.s. i am a bit needy arent i
When the water going into the intake pipe on the overflow the siphon pulls the water over and out the other side. This continues working no matter how little water you supply to it. You can supply it 1 gph or 210 gph. It still will work. You only have to make sure that the maximum capacity of the overflow is higher than the amount of water being supplied to it, not the minimum.
The "suction" you keep referring to is not really suction per se, but more equalization. The U tube is just the pathway for that to take place. Yes, it is a siphon in that it moves water from one side to the other, but it doesn't suck like a wet vac.
The "suction" you keep referring to is not really suction per se, but more equalization. The U tube is just the pathway for that to take place. Yes, it is a siphon in that it moves water from one side to the other, but it doesn't suck like a wet vac.
Hm, ok, my dad wants me to make it somehow so that more waste from the bottom might be able to get in the intake. I saw this idea on some page on this thread, does it really work?
So basically, you just add a loose pcv pipe over the other one and let the bottom rest on the "U" inside the tank. because the top of this pvc pipe (probably gonna be 1.5-2 inch pvc) is above the water level, the intake has to get the water somewhere so that comes from the opening from the bottom of the bigger pvc. The green arrows are the water :3 lavender is the water line, red is the tank, black is the overflow xD
Would this work? I showed it to my dad and he thinks it will work, so do i. In my theory, it should work but then again, im mostly wrong
random question : what is the max output a 3/4 inch pvc pipe can handle? when my dad and i built a well, we used those and now we have like 30 foot of it lol. Just wondering although i will get 1 inch pvc to be on the safe side because it is inexpensive. thanks
also, am i not able to edit my post? im still new here so i dont know if i missing anything...
So basically, you just add a loose pcv pipe over the other one and let the bottom rest on the "U" inside the tank. because the top of this pvc pipe (probably gonna be 1.5-2 inch pvc) is above the water level, the intake has to get the water somewhere so that comes from the opening from the bottom of the bigger pvc. The green arrows are the water :3 lavender is the water line, red is the tank, black is the overflow xD
Would this work? I showed it to my dad and he thinks it will work, so do i. In my theory, it should work but then again, im mostly wrong
random question : what is the max output a 3/4 inch pvc pipe can handle? when my dad and i built a well, we used those and now we have like 30 foot of it lol. Just wondering although i will get 1 inch pvc to be on the safe side because it is inexpensive. thanks
also, am i not able to edit my post? im still new here so i dont know if i missing anything...
As long as the top of the part in the tank is open it will, but if it was a closed U tub it would siphon all the water down to the opening out of the tank.
Just get a piece of 1-1/2" pice to go over the 1" pipe like a sleeve. The top of the 1-1/2" pipe needs to be above the water level.
What will happen is the flow over the pipe will pull water from down below.
Just get a piece of 1-1/2" pice to go over the 1" pipe like a sleeve. The top of the 1-1/2" pipe needs to be above the water level.
What will happen is the flow over the pipe will pull water from down below.
You could also cut a 1" slot in one side of the 1-1/2" that way it could go below the intake tube and be secure as well.
