Tiny Bubbles in the utube?

[chrisd]

Originally Posted by motorslave

Lowering the box in the tank will lower the water level. That will slow the velocity as the tank level will be closer to the level in the outer box. This will allow a shorter distance for the water to fall into the outer box in relation to the level in the tank. There needs to be enough difference between the two. Otherwise reduced to no siphon effect.
Think GRAVITY!

i think you may be off about this. the overflow box is desinged to be lower on the outer box then the inner box so no matter were the inner box is positioned in the tank it will never be lower then the outter box. thus lowering the inner box will cause the water level to rise in the inner box so as not to create a water fall causing the u tube to fill with air bubbles.. by raising the water level in the inner box you would make the water line higher then the outter box creating more of a siphon.

[fuzzybob4]

to get rid of that bubble in the tube turn off you pump take out the tube clean it than tank some air line tube and put in to the U bend at the top have the air tube at the top and coming out of the over flow box make sure that the air tube is like 1.5 feet. your now going to suck the air out of the tube and the bubble is gone. mine does that too.and than you have to pull out the air tube.

[motorslave]

Originally Posted by chrisd

i think you may be off about this. the overflow box is desinged to be lower on the outer box then the inner box so no matter were the inner box is positioned in the tank it will never be lower then the outter box. thus lowering the inner box will cause the water level to rise in the inner box so as not to create a water fall causing the u tube to fill with air bubbles.. by raising the water level in the inner box you would make the water line higher then the outter box creating more of a siphon.

Well, I guess I can only speak to what I have experienced and dealt with. Personally, I think you are off but like I said, I only have what I have experienced to go off of.
Plus your last sentence just stated exactly what I was saying.....

[motorslave]

Lowering the inner box does not change the amount of water flowing into it. It also does not change the level of the outer box. The two are separate, or should be, for adjustability. It's physics. If the water does not have a lower level to fall into it will not draw water from the inner box. It's not a maybe. Too little of difference to fall will create a slow velocity (not GPH, velocity). The VELOCITY is what keeps the bubbles from staying at the apex of the tube.

[chrisd]

ok ...let me think about this.
lowering the inner box into the tank would cause more water to flud in creating more of a swimming pool. from the overflow boxes i have used the slots got wider at the top to allow more water in.that would make the water line higher then the outter box.

hmmm i think i need a beer?
plus i ment no disrespect

[chrisd]

plus the tube will only flow as much water as it was designed to do. you would need a bigger tube or you would have to use two of them to create more flow.
so i don't think it will matter where the inner or outter box is positioned. well except for the outter box being higher then the tank.

[motorslave]

none taken! One of the things to keep in mind is that the level in the tank will balance to the amount pumped into it as long as the same amount can be removed. The balance isn't created by the pump, its created by the ability of whatever drain method is used and its ability to keep up with the pump. The raising or lowering of the inner box will lower or raise the level in the tank, if the narrower part of the teeth will allow 300gph through and you have 350 being pumped in, the water will raise against the teeth till it can go through them at 350gph.
Now with the tube, or any siphon, the destination has to be lower than it origin. If not it wont work as it relys on gravity. Gravity pulls water through the tube and creates a vacum in the tube that is filled with water from th inner box. If the levels on both sids are equal then no flow. If there is only a slight difference then the water will be pulled by gravity to the lower end but slowly. The better the drop, the faster the water will flow, or fall, to the lower level. Drop a rock fro 1 foot high, then from 20 feet high, which will be faster? Now put the same concept to the tube. The water will move faster if it is falling faster, this increased speed will prevent small bubles from collecting as the speed will be strong enough to pull the bubbles along for the whole ride.
I think it may be the way I am explaining it. It took me a bit to get my head around it but the balance is ntural in the tank as long as the drain can keep up with the pump.
But a siphon needs gravity to work and gravity isnt a factor if there is no differenc in the origin and the destination.

[motorslave]

The water in the tube MUST fall in order to draw water from the inner box. To do this the water LEVEL in the outer box must be lower than the level in the inner box. Its physics.

[motorslave]

A one inch tube will flow somewhere around 400 to 600 gph gravity assisted ( I dont remember the exact amount) pumped is more as the water is pushed through the tube or pipe.

[chrisd]

ok i think were a little confused here. i was not saying that by lowering the inner box it would create more of suction but that it would not create a waterfall effect thus more bubbles being sucked in and trapped in the tube.

[motorslave]

Originally Posted by chrisd

ok i think were a little confused here. i was not saying that by lowering the inner box it would create more of suction but that it would not create a waterfall effect thus more bubbles being sucked in and trapped in the tube.

Ah I see! The bubbles will always be there to some extent. The water coming into the inner box will always be the same unless the pump gph is changed. so lowering it will still flow the same amount into the box.
The whole trick is to take the velocity up a notch so the bubbles cant stop to talk at the top of the tube.

[chrisd]

ok i understand what your saying now i think we had our wires crossed.
you must be at work to be popping in and out like this.

[chrisd]

Originally Posted by motorslave

Ah I see! The bubbles will always be there to some extent. The water coming into the inner box will always be the same unless the pump gph is changed. so lowering it will still flow the same amount into the box.
The whole trick is to take the velocity up a notch so the bubbles cant stop to talk at the top of the tube.

you were explaning one thing while i was explaning another.

[motorslave]

Not work, three kids

[chrisd]

from all the overflow boxes i used 25plus years ago they all would trap air in the tube. just not to the effect that it would be a problem in a manner of a few days but rather they would run for a month or so before i had to siphon them out.

don't they sell a pump that would take them out?
i thought i saw in another thread that someone used one?
i think i remember. it was gouch