diy overflow

[nolapete]

It is safer to use 2pcs of 1 inch pipe than making a larger diameter,as ive observed that larger pipes lose its prime,unless you have a strong pump,

Pump size and pipe size have NOTHING to do with a properly constructed PVC overflow keeping it's prime.

The U on the inside and the U below the T on the outside are what keeps the prime, nothing else. Both hold water even when the pump is off therefore preventing the siphon from breaking.

If a larger pipe is not holding it's prime, air is getting in somehow.

 

[mikeymik'd]

A diagram is asking a bit much considering my computer. It is just a tee with a pipe in the bottom. If your overflow is exactly like the one at the beginning of the thread (with the 90 on the intake tube) then you just plug it into it. If you are missing the 90, then you will need to add one.

This 90?

 

[CHOMPERS]

This 90?

Yep. The one in the pic has a guard on it though. Just use a standard 90 going to the tee.

 

[CHOMPERS]

Pump size and pipe size have NOTHING to do with a properly constructed PVC overflow keeping it's prime...

^ Yep, what he said.

 

[Ceahorse]

i was thinking that this "T" should be higher, setting the level of the tank water ,, no?

 

[Burko]

"this "T" should be higher, setting the level of the tank water ,, no? "

Yes...No is correct. The level of the tank is set by height of the inflow. The efficiency of the piping is set by the depth of the outflow.

 

[nolapete]

No it doesn't need to go higher. Right on top of the 90 is sufficient to hold the prime. All that raising it will do is increase the weight on the outside. It will do absolutely NOTHING to increase function or performance. The one on my 110 has been running for over a year and has never broken prime. The power has gone out quite a few times and sometimes for a few days.

 

[Ceahorse]

GREEN

This part sets the depth of overflow inside the tank.. ?

BLUE

DOes the pipe fill up with water at all. or is it simply used to give air to the flowout.

2nd. Does it need to extend above the lvl of the water?

 

[nolapete]

Green sets the level at which the water overflows in the tank.

Blue does not fill with water past the T outlet, but does need to be at least equal to green.

For uniformity, I make blue the same height as the opposite side that hangs over the tank.

 

[Ceahorse]

cool thanks..

Lastly. How small can i go for a 2400L/hour pump..

1/2 " be ok? Anyone try it?

Its a small tank. but id like to increase the volume with a sump