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At present time we plan on using an 150-175 cfm compressor that is capable of
100-150 psi. Our supply 
line is .750" (19.05mm) I.D.  Our lift design is 6"  (152.4 mm). I have a
dead-mans valve in the design as 
well as 2-3 inch (50-75 mm) stand offs on the bottom of the lift. The air
will be plumbed into a manifold 
with a series of outlet holes, the air will enter the lift about 1 foot
(333mm) from the mouth.  The mouth 
of the air lift will also have cross wires to prevent large objects from
entering the lift.  We plan on taking 
the lift to the surface and having it empty in to a large basket made of
metal hardware cloth.

I have seen designs where the air enters the lift a considerable distance
from the mouth.  The problem I 
see with that style lift is that there is no dead-mans valve.  


A water lift is also being considered because of its ease of use.  I am not
sure how effective it would be. 
From what I can find out about water lifts they are much less effective that
the air lift.

Our working environment is inside of a WW II submarine located in 110 ftsw.
(33.52 meters)


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Alex Varouxis
Falls Church, VA   USA

E-mail avarouxis@ao*.co*
E-mail alex1@ac*.di*.ne*
(W) 703.549.5999
(H)  703. 534.3408
(F)  703.548.0919
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