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At 07:11 AM 11/14/97 -0500, you wrote:
>A real good anal way of doing this proceedure is what is necessary to
>get it right. Bill Mee and I do it together, and we have a whole
>checklist to go through before disconnecting the tanks, and in the whole
>process.
>
>Adding oxygen to a high helium mix can feel like yoiu are adding it when
>youi are not. Just presurizing a big fill line fr9omt hat pressure to a
>small increment higher, even with a very accurate digital guage is a
>fooler since you can hear the gas moving even when the tank is not in
>fact open to accept it - a real dangerous situation. You have to
>depressurise the line afterwards and note the tank change on the same
>guage that the system was on to begin with , and you must do it quickly.
>There is no way the pressure has risen without the addition, even if the
>number is thrown off by the cooling - it can not decrease.
>
>Little double checks like that , and then immediately throwing the
>analyzer on the result will give you some comfort. The go and throw it
>ont he pure helium to be sure it is not offset. A lot of work, but you
>are always betting your life with this stuff.

George, how about posting a copy of your check list.  I for one would like
to see the information and think it's a great idea.

Jim Bembanaste

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