Can Lift pump draw water from a depth of more than 20 metres?
No. a lift pump works by creating a vacuum, which draws the water upwards. But that is not a very good description. Better is: It creates a partial vacuum. That causes the atmospheric pressure on the water in the well to push the water up the pipe. But atmospheric pressure (101 kPa) in meters of water is 10.3 meters of water. And that is as far as the water can be pushed, so the pump will never get an water, it will just be spinning on a vacuum. In real life, the pump can only create a partial vacuum, a good ways from a total vacuum, so the max height is less than 10.3 meters. Look at it another way. If you had a 12 meter long tube closed at one end and filled with water. If you inverted, being careful not to let any water out, and put the open end in a bucket of water and the tube vertical, at the top of the tube you would see an empty space. That will be at 10.3 meters above the surface of the water. The atmospheric pressure on the surface of the water in the bucket will push the wat
