Airlift outlet depth

In depth subjects relating to Airlift.
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slk
Posts: 9
Joined: 02 Oct 2018, 19:08
Location: poland

Airlift outlet depth

Post by slk » 11 May 2019, 20:42

In my new project I am going to use 4-6 pressure airlifts. Main problem is I have to put horizontal pipes to the pond below grass level. My pond is also elevated about 30cm above ground level. I plan to put those pipes (airlift outputs) 60cm below water level. I am going to use double T of course. Will it work, 60cm below water level?

I think that it should be no problem to put out air via double T (also 60cm tall, to be above water level). What do you think?

slk
Posts: 9
Joined: 02 Oct 2018, 19:08
Location: poland

Re: Airlift outlet depth

Post by slk » 14 May 2019, 14:45

Image

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Pssymon
Posts: 165
Joined: 11 Dec 2015, 00:12
Location: The Netherlands

Re: Airlift outlet depth

Post by Pssymon » 15 May 2019, 23:48

Hello,

That's an interesting setup, thank you for the drawing.
I believe it will work, I can't say anything about the efficiency though.
I will ask Marc to have a look at your design.

slk
Posts: 9
Joined: 02 Oct 2018, 19:08
Location: poland

Re: Airlift outlet depth

Post by slk » 16 May 2019, 20:01

I have decided to move airlifts output 20 cm up, so now it looks like this

Image
picture upload

Rich Palmisano
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Joined: 22 Aug 2018, 18:38
Location: Jacksonville, Florida

Re: Airlift outlet depth

Post by Rich Palmisano » 21 May 2019, 13:41

Is there any limiting factor as to why the pipes cannot be above the ground?

I agree, it would be much more efficient if the outlet was at or just below the water level.

slk
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Joined: 02 Oct 2018, 19:08
Location: poland

Re: Airlift outlet depth

Post by slk » 25 May 2019, 17:23

Pipes can not be above ground level, cose I have got lawn there. I have to burry them a least 10 cm under the grass level.

BWkoi
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Joined: 20 May 2017, 05:02
Location: USA

Re: Airlift outlet depth

Post by BWkoi » 01 Jun 2019, 16:53

Raise the airlift output to 2 cm below the surface. Use double vent pipes to degass and use the discharge pipes shown. Use a tee and vent where pipe goes down. Since you provided vent pipes at where the pipe goes down there will be no airlock and it will function

55011
Last edited by BWkoi on 03 Jun 2019, 17:05, edited 1 time in total.

slk
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Joined: 02 Oct 2018, 19:08
Location: poland

Re: Airlift outlet depth

Post by slk » 01 Jun 2019, 21:24

I was also thining about this solution - but two more 90 bends here. Probably I will try those 2 setups and see which is better.

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Pssymon
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Location: The Netherlands

Re: Airlift outlet depth

Post by Pssymon » 02 Jun 2019, 03:57

I thought I sent Marc a PM about this, he usually knows. But It seems like something went wrong on my end. I sent him another PM. I'm not 100% sure what the best course of action is here, hopefully he can give some insights.

slk
Posts: 9
Joined: 02 Oct 2018, 19:08
Location: poland

Re: Airlift outlet depth

Post by slk » 02 Jun 2019, 12:19

Airlift chamber + bio is not digged yet so I can make it best for chosed setup.

BWkoi
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Joined: 20 May 2017, 05:02
Location: USA

Re: Airlift outlet depth

Post by BWkoi » 03 Jun 2019, 17:12

For good efficiency the airlift manifold needs 160 to 180 cm riser pipe length and submersion. In your diagram the riser tube from the manifold is short and submersion is wasted on the very long vents.

slk
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Location: poland

Re: Airlift outlet depth

Post by slk » 04 Jun 2019, 12:35

It was just a sketch. Rising pipes can be as long as they need. I can mage them even 2m long. Airlift chamber is not digged yet.

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Pssymon
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Location: The Netherlands

Re: Airlift outlet depth

Post by Pssymon » 18 Jun 2019, 21:16

BWkoi wrote:
03 Jun 2019, 17:12
For good efficiency the airlift manifold needs 160 to 180 cm riser pipe length and submersion. In your diagram the riser tube from the manifold is short and submersion is wasted on the very long vents.
I asked Marc as well, and he confirmed this. Now that I think about it again it makes absolute sense.
slk wrote:
04 Jun 2019, 12:35
It was just a sketch. Rising pipes can be as long as they need. I can mage them even 2m long. Airlift chamber is not digged yet.
2m would probably be overkill. I would go either 160 or 180 as BWkoi suggested. We have good results at 170cm. 145cm is also possible but 170cm seems to be a length that usually yields good results.

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