Building an air-lift with the height larger than depth?

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chocobombo
Posts: 1
Joined: 01 Oct 2018, 16:02
Location: Vietnam

Building an air-lift with the height larger than depth?

Post by chocobombo » 01 Oct 2018, 16:45

Hello,

I would like to build an air-lift pump to circulate the watering system.
The system may look as followed. The water from T1 will be pumped (via the orange pipe) to T2. Flow rate about 9m3/h.
Image

I have done some research on how to design an airlift pump. And in all the cases, the lift heights are smaller than the depth (from the air injection point to the surface)
I would like to ask, if it is possible to build an airlift pump for this application. (if yes, any hint on how to design this system)\

Many thanks for your suggestions.

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Pssymon
Posts: 131
Joined: 11 Dec 2015, 00:12
Location: The Netherlands

Re: Building an air-lift with the height larger than depth?

Post by Pssymon » 10 Oct 2018, 22:07

Hello and welcome,

I hate to say it but it's not possible the way you designed this system. We are talking about a discharge head of over 1,5 meters. If you want a yield of 9000 liters the maximum discharge head would probably be around 10 centimeters if you are lucky. The system has to be level, even at 5cm of discharge head you're wasting a lot of potential. This system is just not designed for it.

If you have any further ideas or questions, feel free to share them. In a level system, a flowrate of 9000 liters per hour is easily achieved.

Rich Palmisano
Posts: 34
Joined: 22 Aug 2018, 18:38
Location: Jacksonville, Florida

Re: Building an air-lift with the height larger than depth?

Post by Rich Palmisano » 22 Oct 2018, 18:47

There are other air lift methods that will achieve higher lifts, from 0.5 to 2.0 feet (15 cm to 65 cm) with flow rates up to 300 gph (1200 lph) using 40lph at 3psi pumps (I know cause I've done it...) but I haven't attempted to lift water that high.


I would assume you'd need a very robust air source and use of a very deep sump to allow that sort of lift.

Rich Palmisano
Posts: 34
Joined: 22 Aug 2018, 18:38
Location: Jacksonville, Florida

Re: Building an air-lift with the height larger than depth?

Post by Rich Palmisano » 26 Oct 2018, 17:24

I found this:

http://api.ning.com/files/5sXTPNNd5jk1j ... lation.xls

I didn't verify the calculation methods, but based on the parameters you outlined:

A 4" (100 mm) air lift 2M high would require, 9.3 ft3 (263 L3) of air and a depth of 18' to move 57,120 gal/day (9M3/Hr) at a pressure of 7.8 PSI. This is hefty...

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