Jeff-

Sounds to me like you need some "screw-top brain therapy" :)

   Jim

Sender: Jeff Waugh  Date: 4/9/99 3:13 PM

>Yes Jim, that is correct. In fact, I pulled the directions for 
>installation off of
>your web site.
>1) Cut top of cylinder off with a die-grinder or other suitable cut-off tool
>2) Insert  "Fin" mechanism gently into cylinder
>3) Replace top of cylinder, making absolutely sure you have the grind 
>marks left
>from the removal process lined up to facilitate a proper "bond" when the 
>welding is
>complete.
>4) Overfill cylinder by no less than 1500 psi. to ensure that the welding 
>process
>yielded no leaks.
>5) And last but not least, roll cylinder around garage to test your new "Fin"
>mechanism.
>
>Another fine product that will ensure that you DIR! :)
>
>Jim Cobb wrote:
>
>> The inside of my tanks are smooth, and would impart no stirring action to
>> a mix. Did  you weld fins inside your tanks to accomplish this mixing
>> action you say rolling tanks does?
>>
>>    Jim
>>
>> Sender: Jeff Waugh  Date: 4/8/99 11:13 PM
>>
>> >     I'm not sure about the temperature actually being that much of an
>> >influence
>> >on the ending reading. I have found that generally low O2 % mixes such as
>> >"deep"
>> >Tri-Mix'es generally homogenize to the final desired analysis over a
>> >period of a
>> >few hours.
>> >     I've found that high O2 mixes that if filled with O2 and topped with
>> >air and
>> >allowed to sit without agitation, can render an inaccurate analysis a day
>> >later.
>> >At that point, a simple "roll" around the garage will suffice to get you
>> >what you
>> >were looking for!
>> >
>> >Jim Cobb wrote:
>> >
>> >> I don't know about you guys but I think the problem we are dealing with
>> >> here is the temperature of the mix rather than stratification. As the mix
>> >> cools off the reading becomes more accurate.
>> >>
>> >>    Jim
>> >>
>> >> Sender: Steve Hogan  Date: 4/8/99 6:53 PM
>> >>
>> >> >
>> >> >I have run into this and have modified my mixing procedures
>> >> >so that after I add the O2 to the helium I wait 1 day (I
>> >> >usually mix at night so waiting around is not appealing)
>> >> >before measuring the O2 % (O2 & He). It is not hard to figure
>> >> >out what percentage I expect after mixing O2 with He.
>> >> >Next step is to add air, wait a few hours (usually doing
>> >> >something else) and then measure again.
>> >> >I fill about 50 psi/min so I expect to not get much mixing from
>> >> >Brownian motion.
>> >> >
>> >> >Steve
>> >> >
>> >> >-----Original Message-----
>> >> >From: Patricia Disler [mailto:pdisler@io*.ne*]
>> >> >Sent: Friday, April 09, 1999 1:14 PM
>> >> >To: S I L E N T I M M E R S I O N
>> >> >Cc: techdiver@aquanaut.com
>> >> >Subject: Re: Trimix Question
>> >> >
>> >> >
>> >> >
>> >> >
>> >> >
>> >> >At 09:16 AM 4/8/99 -0700, you wrote:
>> >> >>Frank,
>> >> >>
>> >> >>>Not me, but I do let the filled tanks rest a day before analyzing. An 
>if
>> >> >>>you want to tell me
>> >> >>>thats not neseccary I recommend that you try this: Fill oxygen, top 
>with
>> >> >>>air, wait a minute,
>> >> >>>analyze mix, turn the tank so that the valve faces ground, wait 
another
>> >> >>>minute and than
>> >> >>>re-analyze the mix.
>> >> >>
>> >> >>And it's the same... or not?
>> >> >>When filling a tank the temperature and pressure are high which in turn
>> >> >>gives a high diffusion coefficient. Makes the mix homogeneous almost
>> >> >>instantaneoulsy (couple of seconds).
>> >> >>What kind of differences do you get?
>> >> >>What kind of analyser do you use, are you sure the hoses are drained 
>when
>> >> >>using a regulator or something?
>> >> >>
>> >> >>Regards,>
>> >> >>THOMAS
>> >> >
>> >> >I have witnessed Nitrox mixtures take a while to fully homogenize. 
>Several
>> >> >years ago while mixing 80/20, (Yeah I know don't start) it came out 63% 
>O2
>> >> >approx 30 min after the very s-l-o-w top off to fill pressure. Yes I
>> >> >checked the calibration of the aynalizer (Teledyne TD-50). Each time I
>> >> >would check the O2 reading would climb. I did this over a period of 
>several
>> >> >hours. Later it was right on 80%.
>> >> >I'd have to say stratification can and does occur, esp. if there is not
>> >> >enough turbulence during top off.
>> >> >I have never seen this with Trimix as the fill rates are much higher.
>> >> >However I suppose it could occur if they too were topped slowly.
>> >> >At any rate I never seem to dive my gas until they show the correct
>> mixture.
>> >> >
>> >> >
>> >> >
>> >> >"SILT HAPPENS"JD   JEFF DISLER
>> >> >  SAFE CAVING       NSS 26000
>> >> >--
>> >> >Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'.
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>> >> >--
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>> >> >
>> >>
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