DIY PVC over Flow? TEE placement?

[epond83]

Ok so i know there is a ton of info on this but i couldn't find an answer.

I know the TEE needs to be higher then the bottom loop inside the tank, but does it matter how high? Does it affect water flow and or noise?

Seems like if it is higher water will fall a shorter distance and make less noise, but i don't want the flow to be reduced.

I'm using 1.5" pipe and have a 1,100 gph pump so i don't to have low flow and flooding. Also 1.5" fittings aren't cheap so i would rather not build this too many times.

 

[Oughtsix]

Yes, the height of the T determines the total drop of the siphon. The drop of the siphon is the distance between the T and the water level in the tank. The higher the T the less the flow... up to the point the T is at the water level and the siphon will stop.

Yes the T has to be above the bottom loop in the tank. If it is too close to the bottom loop in the tank the water will have momentum and suck past the bottom loop breaking the siphon... so make the T at least 4" or so inches above the bottom loop in the tank.

Weld (glue) the majority of the PVC together but leave the following pieces as press fits while you are testing your pipe.
1) Leave the outside up pipe not glued. You will need to tweak its length to set the height of the T. The force of gravity should keep the joints on this pipe together temporary. (As opposed to the down pipe which would be pulled apart by gravity and the weight of the rest of the fittings.)
2) Leave the two elbows forming the bottom loop inside the tank unglued. This will allow you to tweak the water level in the tank by tilting the intake pipe to an angle. This will also allow you to remove the in tank vertical intake tube so you can trim it to length easily.

 

[epond83]

Hmm ok sounds good thanks. Inside I have 18" of height so i guess I'll start in the middle and work my way down.