180g pvc overflow

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B

bjrouse

Feeder Fish
MFK Member
Feb 17, 2009
16
1
0
Brisbane, Australia
Hi guys,

I have made this for my 6x2x2.

I have got it to siphon. I closed the ball valve, sucked all the air out, filled it with water and then opened the ball valve. I assume I did it correctly.

Anyway, Once I got it going late last night I had a bit of a test to make sure it works well however when i turned the power out, It lost it's siphon. Can you see anything wrong with it to suggest why?

I am also struggling to get the return pump and overflow to sync flow wise. Is there any trick to it or is it just a matter of playing with it till you get it right.

Thanks

260120112.jpg
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Do you have check valves on those air lines? Looks like air might be getting back in.

Your pump should put out less than the overflows can handle. If it is not, you need to restrict the pump with a ball valve.
 
Pharaoh;4833755; said:
Do you have check valves on those air lines? Looks like air might be getting back in.

Your pump should put out less than the overflows can handle. If it is not, you need to restrict the pump with a ball valve.
Click to expand...


The airlines are now siliconed in.

The overflow is stronger than the pump but my issue is now only keeping siphon when the power is turned off
 
But do you have air check valves on the silicone tubing. If you do not have a way to restrict the air from going back into the overflow, it will continue to lose siphon.
 
Pharaoh;4833847; said:
But do you have air check valves on the silicone tubing. If you do not have a way to restrict the air from going back into the overflow, it will continue to lose siphon.
Click to expand...

Oh sorry, yes they are check valved.

It works perfectly and I have even timed the overflow with the pump.
It's just when I switch the pump off and the water level drops below the overflow inlet in the tank that it won't start siphoning again when I switch the pump back on.
Do those inlets need to be low enough so they are constantly underwater?
 
Your inner loop and outer loop are not even. The outside is lower which is probably the issue. Try making the loop inside the tank even with the outside loop. Hopefully you didn't glue it yet... :(
 
proxenus;4835696; said:
Your inner loop and outer loop are not even. The outside is lower which is probably the issue. Try making the loop inside the tank even with the outside loop. Hopefully you didn't glue it yet... :(
Click to expand...

Yeh it's glued but from the bits that i read I thought it was supposed to be lower. I copied it off one on youtube
 
proxenus;4835696; said:
Your inner loop and outer loop are not even. The outside is lower which is probably the issue. Try making the loop inside the tank even with the outside loop. Hopefully you didn't glue it yet... :(
Click to expand...


This is what I seen before I even read the thread...


bjrouse;4835954; said:
Yeh it's glued but from the bits that i read I thought it was supposed to be lower. I copied it off one on youtube
Click to expand...

Try this design. It works well.

http://www.youtube.com/watch?v=wHrpG8jG0Uk&feature=related

And it will only take 2 cuts and 2 couplers to fix your issue.

G/L
Mike
 
bjrouse;4836021; said:
I based this one off his first design.

So am I replacing the top tee with a 90 deg piece or shortening the outside
Click to expand...

Shorten the outside to get the two loops to match. Give me a second and I'll photoshop your pic.

Mike


260120112.jpg


Edit: Cut the pipes with circles and use Couplers to re-connect the pipes once the arrows are lined up.

Mike
 
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