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Will this DIY overflow work....

Terryz_

By Terryz_,
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porc Newbie

porc

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okie understand now... you don't want to hijack other peoples thread...

but you should describe your system more. what you want to achieve and what you have in mind.

based simply on your question i would say yes the siphon will work, but without further information i can also say that the siphon will empty half your tank..

let us know more and we'll try to help you...

cheers... :)

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Terryz_ Newbie

Terryz_

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oh.. to add the siphon will work if the main purpose of the air valve is to extract air during priming of the siphon and will be closed during normal operation.

Can i leave it open without the air valve... Will it work..

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Terryz_ Newbie

Terryz_

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Oh... That means when starting the siphoning... The air valve will be open bit by bit to extract the air... and when the water start flowing to the sump... the air valve have to be closed... Correct interpretation???

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porc Newbie

porc

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the air will not flow out by itself. you have to suck the air out. let me explain the procedures.

1) stick the input of the siphon into the water.

2) cover the output of the siphon ie. place a plastic bag over the output and use rubber band to hold it in place.

3) open the air valve and start ###### the air out.

4) when water begins to be sucked out of the air valve, shut the air valve.

5) remove the plastic bag and your siphon will start immediately...

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mUAr_cHEe Newbie

mUAr_cHEe

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I also got question!!!

Is it necessary to install a ball valve for the piping down sump and return???

see whether u want to be able to control the water flow or not lohz...

if u cartoon like me.... plumping always got some where ###### up.... then at least u got valve there.... easier for u to stop water... take out rest of pipes to redo everything... heehee...

*translated from Hokkien*

"If say no bang wall, this idiot will never ripen" - Mr Quah Siew Kow.

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Domino Newbie

Domino

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:P Huh... if there is a black-out in this case, the siphon will suck the water out of the main tank until the level of the siphon intake... you sump will overflow and you will be left with a mess... :cry2: no need to worry about it sel-priming... It won't!! :lol:

Anyway, Such a siphon solution should really not be atempted because it is impossible in practice to perfectly match the siphon downward flow rate with the pump puward flow rate. Even if you manage to get down to 10ml/min difference (it's really not much water, check with a test tube...) after 24 hrs (1440 min) you would be left with 14 liters too much or too little in your tank! wich means that sooner or later either your sump or your tank will overflow. and then :cry2:

Even if by miracle after a lot of fine tunning you achived perfectly matching flowrates, it would not sustain by itself in the long run (simply debri and algae in the siphon will change the flowrates unevenly... not to mention evaporation and fresh water topups.)

The reason why people make twisted and weird "siphon overflow" systems is that somehow only the volume of water added to the tank by the sumppump must be allowed to overflow back in the sump... and be pumped back in the tank and overfow back in the sump... The volumes are the same by simple laws of physics, you can't get it wrong and it's almost as easy to make. Just bear in mind that the output (the bottom of the tube opening where the water actually "overflows") must be at same height as the level you want to have in the tank like in the diagram below. try to mentally move the water line up and down and figure what the resultwill be on the output. If you move it too low, nothing will come out right?? only the extra water above that level will overflow... and that extra water is added by the sump pump... and the cycle is closed :D

I hope this helps!! ;)

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rockfish Newbie

rockfish

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hey bro ... if u follow this design .. u will realise another problem when u finish and test it ... water flow rate too slow ..

becos.. the water column is too little.. there for not enough pressure to push the water out fast enough ...

i did this same set up ... after finish everything then i realised this ... there is a better design out there in this forum .. will post for u later ... that is a modification ... fail proof..

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rockfish Newbie

rockfish

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there it is ...

the modification of that previous design ..

notice the second bend is very low .. and the surface skimmer tube is to create a deep water column... the water level in the tank is mantain by the top of the surface skimmertube ..

post-9-1082108056.jpg

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porc Newbie

porc

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notice the second bend is very low .. and the surface skimmer tube is to create a deep water column...

please go look into your skimmer column and see what is the water level inside that......

sigh... again...

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