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Wrolf wrote:
>[stuff deleted]
>
>I am assuming here "poor man's set up" (my own definition): you have an air
>compressor, but you buy He (and O2) in tanks from a supplier.
>
>Even if your air compressor had an inlet that you could feed from the He tanks,
>you would probably waste a lot of gas in flushing out the air, then flushing
>out the He.
>
>Wrolf
I have never seen a compressor with an inlet you can fedd from a He tank, but
it is very easy to make one:
old second stage
with expiration valve
sealed
Compressor air inlet !--! 1st stage
---------------------<><><><><><><><><><><>!
! []
---------------------<><><><><><><><><><><>
!-----------------[]
large !--! LP hose []
flexible / \
rubber hose / \
! !
! !
! He !
! !
! !
! !
! !
------
Hope it's clear enough.
Of course you loose some He to fill your compressor and the hose. But if your
compressor is reasonably small (< 10 cubic meters per hour) you don't need a
great amount of He to fill the compressor. You also lose He because is leaks
through the compressor pistons.
I am working on a better system in which there is an expansion bag between the
second stage and the compressor inlet in order to prevent the second stage from
vibrating.
Michael Walz
walz@el*.ep*.ch*
walz@la*.ep*.ch*
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