From: jfol@hydra.unm.edu (Joshua Follick (Paintball Underground))
Subject: Re: Gas ... CO2 N2 own tank ?
Date: Wed, 02 Sep 92 06:14:08 GMT
Organization: University of New Mexico, Albuquerque

In article <1992Aug26.040608.17438@panix.com> henryc@panix.com (Henry Chan) writes:
>In article <b7ang2f@lynx.unm.edu> jfol@hydra.unm.edu (Joshua Follick (Paintball Underground)) writes:
>>>
>>   Such an "adaptor" is what I am refering to when I say
>>"fill-station." I don't know about thermo valves,
>>but a fill station would be required to fill a CA
>>bottle, at least those that I have seen.
>
>Not necesarily true.  The SL-68 came with fill adapter nut which allowed you to
>fill a pin valve tank directly from a thermo valve equipped bulk tank.  The
>hydraulic pressure of liquid CO2 would push open the pin valve for a fill.  
>Without a bleed off valve to relieve the pressure in the fill adapter you'll
>likely lose a few white O-rings when you disconnect the tanks.
>Another drawback is you can only weigh the tank before and after the fill.  If
>you overfill you have to bleed off the excess by hand unilke a pin valve adapter
>fill station which has a bleed off valve that lets you do it while you're still
>hooked up to the bulk tank.

   In that case, with the exception of a very few cases such as this
exoctic version of the SL-68, a recent SL-68 II that went through
the store had no such adaptations. I expect when CA was new,
there was a need for such flexibility. Now, such adaptors
are no longer sold with guns.
>
>>
>>   It is not difficult to purchase a Siphon fill tank, however
>>you are generally looking at a $100-$150 price to purchase any
>>CO2 tank siphon or not. While for a $15 deposit, either local
>>fountain soda distributor will give you a CO2 tank (non-siphon)
>>and bring you (yes bring you) a refill for $8. I sincerely wished
>>to find someplace that would rent me a siphon CO2 tank for similar
>>terms. Unfortunately such a rental agreement does not exist,
>>forcing me to purchase (major sigh) which was the point of my original
>>post.
>>>-- 
>$100-150?  For a brand new tank I presume.  You can get a used tank for
>considerably less.  Whenever purchasing a tank, check for the latest date
>stamped on the tank.  That indicates the last time the tank was hydrostatically
>tested.  Tanks need to be tested at least every five years, but it doesn't
>hurt if you aren't sure of the durability of a given tank.

   Very important point, but I was aware of that, and my tank has of course
been recently tested.
>I know people who are using bulk tanks which doesn't come with a siphon tube.
>When the CO2 supply is running low and the valve is no longer drawing liquid
>they would turn the tank upside down to fill.  I have been told that turning
>a tank upside down is dangerous because thermo valves weren't design to 
>operate immerse completely in liquid CO2 and this could cause the valve to
>rupture or crack off (sending the tank off in the opposite direction like a 
>rocket).
>
   I didn't know this, I know some people who are thinking
of doing this and I will let them know. It is gratifying
to know that my siphon tank purchase was not in vain.
>-- 
>My friends, we can and we will, never, never, surrender to what is right.
>--Dan Qualye speaking to Pat Robertson's Christian Coalition.


-- 
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