Hi John;
Not necessarily. The bubble bump tubing above the water
surface consists of a percentage of water and the rest
is air.
Lets say the air pump pressure is 5psi. This can push
air to a depth of about 12' in the source impoundment.
If the exit tube is 100' above the impoundment there
will be about 12' of water and 88' of air. Off course
this is broken up in short pieces. Also, there is some
friction so the water length will practically be a bit
less than 12'.
This ratio of water to air acts something like an
impedance transformation. This is not all that dissimilar
to the impedance transformation in the ram pump. See:
http://www.redrok.com/water.htm#pumps
Technically the maximum pressure in the tube is defined
by how much water is in the tube. This is only a
percentage of pressure that would occur if the delivery
tube was filled with water.
Neat huh!!!
Duane
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