NEEED HELPPP new pvc overflow

[bubbles123]

Another possibility:

Which type of overflow did you build?

Or

If built correctly, the first one should have no problem keeping up with your pump. If yours looks like the second one, you'll probably need at least 2 of them. I built the second type for my w/c system on one of my tanks, and was surprised by how long it took to drain. Then I took a second look at the pipe sizing charts and flow rates. It makes a big difference with flow rates.

 

[redtailshark1]

the top one is the overflow i used 1.5 inch. it sucks air so here is the design that i think will work realy realy well becaues when it only has water in the bottem it should work realy well if the box gets it will work better under load.
it is the tube going down into a fully sealed box except at the top, the water flows over the top, slits can be added to stop fish getting washed over

 

[redtailshark1]

580 gallons per hour
hope i didnt affend the creater of the pic

 

[SublimeAquatics]

so what size pipe should i get to match the 600gph my pump pumps (it is a 100 gallon tank btw)

 

[scottswald]

Another possibility:

Which type of overflow did you build?

Or

If built correctly, the first one should have no problem keeping up with your pump. If yours looks like the second one, you'll probably need at least 2 of them. I built the second type for my w/c system on one of my tanks, and was surprised by how long it took to drain. Then I took a second look at the pipe sizing charts and flow rates. It makes a big difference with flow rates.

three questions about the first pic.

1. what is the purpose of the the air line check valve? is it vital?

2. how would i start the syphon?

3. could it loose it syphon? if so, you would need to start it again manually?

 

[JakeH]

SublimeAquatics: Your pipe diameter probably isnt the issue. Which style of overflow from bubbles123's post (above) did you build? We need to know so we can give you a decent answer. Both are in the sticky you referenced & it makes a big difference.


EDIT: To scottswald, I can see you're a new member so I'll politely ask that you go read the PVC overflow sticky first & try not to hijack someone else's thread with questions that have already been answered in great detail. Welcome!

 

[redtailshark1]

1The air line check valve is for the pourpose of primeing
2 pour a cup of water in the outside pipe and suck on the check valve
3 it should never fully loose syphon (unless your glue joints are crap)

 

[bitteraspects]

That's only about half right. The check valve plays a far more important role in daily operation as your primary failsafe against cavitation and siphon loss.

As jake mentioned, give the stickies a thurough read through for explanation in how to properly build and operate these overflows.

 

[SublimeAquatics]

O alright I built the first one and siliconed the air check valve into the pvc so hopefully that helps. Just waiting for it to dry up then I'll let you guys know how it goes.

 

[JakeH]

Glad to hear you added the check valve. It really helps keep the prime much better.