The pressure chamber, cheap and good

The place to discuss the regular pressure chamber Airlift.
Marcje
Posts: 40
Joined: 10 Dec 2015, 22:40
Location: Lembeke

The pressure chamber, cheap and good

Post by Marcje » 19 Apr 2016, 23:12

Good evening,

Here you can find a short tutorial on pressure chambers as I make them, cheap and good :wink:
The materials shown here are glued together to form a pressure chamber.

Necessary materials:

1 : 30 cm pvc pipe 110 mm. (In a complete full-size Airlift this would be +-170cm)
2 :Two adapters 125 mm to 110 mm.
3 : One pvc sleeve (sock) 125mm.
4 : One bend (knee) of 20 mm.
5 : 20 cm pvc pipe 20 mm. (In a complete full-size Airlift, this should be as long as the Airlift or longer depending on your application. This will serve as your air line down into the pressure chamber.)

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After drilling a 20mm hole and glueing the elbow with the airtube in place, you can see how to glue the two adapters in the sleeve. Make sure to remove the edges on the adapters and check if they line up correctly. Use the casting line on the adapters to make sure, otherwise your inner 110mm tube will not fit.
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In the 110mm tube two rows of 0,5mm diameter holes and two rows of 1mm holes have been drilled. (Four rows of 1mm holes is also fine)
Make sure that the rows that are under and above each other do not overlap:

Image


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Now you just have to glue the inside of the adapters and the area's where the 125mm sleeve will slide over and push them together.
Make sure your air holes are nicely centered.

Now you are done. :D

54955
Self-knowledge is the beginning of all wisdom

Frank
Posts: 34
Joined: 24 Apr 2016, 22:04
Location: Ceylon

Re: The pressure chamber, cheap and good

Post by Frank » 24 Apr 2016, 22:09

Hi Marcje,

I am using a membran airlift. Is it better to change to this pressure chamber?

Best regards,
Frank

Marcje
Posts: 40
Joined: 10 Dec 2015, 22:40
Location: Lembeke

Re: The pressure chamber, cheap and good

Post by Marcje » 25 Apr 2016, 23:06

Hello Frank,

The airlift Membran works well with a heavier air pump, but for the small energy efficient airpump is an additional force needed to open the memebraam, and this force is a disadvantage
An additional disadvantage of the membrane is to be replaced after a few years

Greetings

Marc
Self-knowledge is the beginning of all wisdom

Frank
Posts: 34
Joined: 24 Apr 2016, 22:04
Location: Ceylon

Re: The pressure chamber, cheap and good

Post by Frank » 26 Apr 2016, 05:18

Hello Marc,

that makes sense, I will try out. :good:

I saw your modell with the additional air outlet in the middle. Is this necessary for the best results?

Since the SLL 20 runs out which air pump you could recommend? I think the Hailea 9810 and Secoh JDK20 could be an option.

Greetings,
Frank

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Pssymon
Posts: 135
Joined: 11 Dec 2015, 00:12
Location: The Netherlands

Re: The pressure chamber, cheap and good

Post by Pssymon » 29 Apr 2016, 15:34

Hi Frank,

I believe the JDK-20 is less powerful than it's predecessor, the SLL-20.
I've seen people suggest the JDK-30 as the better alternative, as this will surely achieve the results of the older SLL-20 and more.
Ofcourse it will use a bit more power, I am not sure if the energy consumption to output ratio is as good as the SLL-20, it's probably similar but we haven't tested this yet.

Frank
Posts: 34
Joined: 24 Apr 2016, 22:04
Location: Ceylon

Re: The pressure chamber, cheap and good

Post by Frank » 29 Apr 2016, 18:55

Ok thanks! I am not quite sure if the best results of the SLL 20 are caused by the good air/current ratio of the pump or the less air output is simply sufficient.

Frank

Marcje
Posts: 40
Joined: 10 Dec 2015, 22:40
Location: Lembeke

Re: The pressure chamber, cheap and good

Post by Marcje » 29 Apr 2016, 21:39

Hi Frank,
I saw your modell with the additional air outlet in the middle. Is this necessary for the best results?
It is a little bit better, but not much

Since the SLL 20 runs out which air pump you could recommend? I think the Hailea 9810 and Secoh JDK20 could be an option.
This summer I test the pumps and put it in a table, and this through my test setup

The results electrical consumption / water displacement will not vary much

Very important is the right depth for a given pump (for the sll20 is this about 140cm )

Greetings
Self-knowledge is the beginning of all wisdom

Frank
Posts: 34
Joined: 24 Apr 2016, 22:04
Location: Ceylon

Re: The pressure chamber, cheap and good

Post by Frank » 10 May 2016, 14:28

Thanks Marc. My best result with the membran is 900 l/h per Watt (with filter), maybe I can reach more with the pressure chamber. We will see...

Greetings,
Frank

bjornd
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Joined: 11 Dec 2015, 11:52
Location: Heerlen

Re: The pressure chamber, cheap and good

Post by bjornd » 11 May 2016, 13:11

Frank wrote:Thanks Marc. My best result with the membran is 900 l/h per Watt (with filter), maybe I can reach more with the pressure chamber. We will see...

Greetings,
Frank
Hi Frank,

Which airpump do you use then?

grtz.,

Bjorn

Frank
Posts: 34
Joined: 24 Apr 2016, 22:04
Location: Ceylon

Re: The pressure chamber, cheap and good

Post by Frank » 11 May 2016, 15:57

Aquaforte AP 60

Frank
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Joined: 24 Apr 2016, 22:04
Location: Ceylon

Re: The pressure chamber, cheap and good

Post by Frank » 15 May 2016, 02:09

Now I reached 24.000 l/h (4 x 6000 l/h) with 22,45 Watt using a membran airlift in real action with EBF and bio filter.

Image
Image

Grettings
Frank

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

Re: The pressure chamber, cheap and good

Post by Pssymon » 15 May 2016, 19:47

Hi Frank,

Thanks for sharing these results with us!
So you are running one Airlift, which gives 24.000 litres per hour, at an energy consumption of 22,45 Watt?
Are you using four outlets? Since you specify 4 x 6000 litres per hour.

This is a good result, considering the filter is also causing drag.
The best result we have gotten was 20.000 litres per hour at 12 Watt, but this is without a filter. So installed in a pond it would be lower.
How much lower, I don't know.

Maybe you could test your Airlift without the filter attached?

Frank
Posts: 34
Joined: 24 Apr 2016, 22:04
Location: Ceylon

Re: The pressure chamber, cheap and good

Post by Frank » 15 May 2016, 21:23

Hi Pssymon,

yes, for the test I used 4 outlets to reach 24.000 l/h with 22,45 Watt. With 3 outlets the result is 3 x 7.700 = 23.100 l/h.

Sorry, without a filter I can not test. But with the filter I am quite sure that I could improve the result a little bit more, if I remove my gate valves. This will be done next week. :P

Greetings
Frank

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Pssymon
Posts: 135
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Location: The Netherlands

Re: The pressure chamber, cheap and good

Post by Pssymon » 16 May 2016, 16:41

Interesting, I'm not really sure how to imagine your outlets.
It is indeed important to look at anything in your filter area that is causing drag, and try to optimise it without risking a big loss in bio filtering capacity.

You seem to be quite serious with your project!
If you want you can start a new topic about your pond / Airlift system and update there.
You can do this in the 'Users ponds' section.

Frank
Posts: 34
Joined: 24 Apr 2016, 22:04
Location: Ceylon

Re: The pressure chamber, cheap and good

Post by Frank » 16 May 2016, 17:03

The VDL gate valves are 92 mm inside only, therefore they are a bottle neck for airlift ponds. If I remove them 3 x 8000 l should be possible with the same energy. At the end the goal is 5 x 8000 l/h with less than 40 Watts. The bio filter is no problem, I did not change it for the airlift.

You could separate my comments to a another thread.

Greetings
Frank

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