Thread: Airlifts - pumping water around a gravity system using only air

Originally Posted by noo

Hello Nick, thanks for chiming in.
I wanted to copy the 5 or 6 inch external air compression chamber on 110mm uplifts like everyone else but it's not easy to source those parts where I am. See A of my diagram

I am able to step down from 110mm to 90mm fittings easily with an internal air compression chamber but that would create a restriction of the 110mm pipe diameter with a reduced flow. See B of my diagram. What I was trying to determine is how much of a reduced flow.... ? The reduced cost, ease of parts and time saving may be worthwhile as I could add another airlift to make up the difference.

However, I have settled on option C of my diagram using a 110mm TEE and putting the air diffuser below and out of the water path. So I can keep the 110mm pipe diameter and reduce costs and not have to import bits from across the world.


Attachment 43729

Hi

I was able to build an air chamber fairly easily...

I used 2 x flexible clay to plastic rubber boots from Toolstation: https://www.toolstation.com/fl...ble...-to-pvc/p54240

And for the main wall of the air chamber I used a 125mm pressure pipe straight socket from here:

https://www.gasandwaterpipelines.co....caAiOHEALw_wcB

Then used a holesaw to make a hole in the wall of the air chamber to glue a 1" pressure pipe elbow for the air supply. If doing this it's worth testing the hole saw on a scrap of pipe first to ensure it's a really snug fit.

Hope that helps.

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