Talk:Spiral pump

Much of this page seems to be copied from others on a similar subject BUT the main premise here is completely wrong. A coil pump is NOT a low lift pump. The whole point of the pump is the ability to provide substantial head - far greater than the pump coil height.

A correct description is given at:

http://en.wikipedia.org/wiki/Spiral_tube_water_wheel

Which says:

Tubing Coil Layout and Hydrostatic Head[edit]

Each coil of the tube helps increase the available head pressure, effectively increasing how high the water can be pumped. Successive coils are wound such that their outer diameter is slightly less than the inner diameter of the previous coil as the tubing spirals in. The diameter of the coil is much larger than the diameter of the tube, so the diameter of each additional coil decreases only a small amount. Due to the alternating water and air that is taken into the tubing the pressure of the previous coil gets added to the pressure in each coil. If the coils are about the diameter of the wheel the apparatus will pump water to a height of approximately the coil diameter multiplied by the number of coils. As an example 3 coils that average 4 meters in diameter could pump water up to about 12 meters above the water surface.[1] At the outlet there will be alternating water then compressed air coming out of the water tubing.

regards

Russell McMahon apptechnz@gmail.com