[Sbs_gems] [EXTERNAL] Re: Argon/Carbon Dioxide gas cylinders to move to to gas shed 90A

[Brad Sawatzky]

I think a premix system for EEL/125 is definitely the way to go.

In the near term we have enough premix to cover us through December
(with a little stretching).

We'll need premix to cover us in January until the mixing system is
ready.  Unless there is an order already in the queue (Holly?), I think
that means we should order another 6--8 premix bottles now so they have
a chance of showing up late-Dec / early-Jan.

Even if the mixing system for the EEL can be online by January, it is
may be a good idea to have 6--8 bottles of premix in reserve either way?

-- Brad

On Fri, 03 Dec 2021, Jack Segal wrote:

> I was under the impression we would set up a mixing system in the EEL?
> 
> On 12/2/2021 5:21 PM, Brad Sawatzky wrote:
> > I moved six 75:25 premix cylinders to the EEL gas racks this afternoon.
> > There are another 2--3 premix cylinders in EEL/125.  That is perhaps
> > ~2 weeks worth of gas for the SBS GEMs -- probably enough to cover
> > December.
> > 
> > I don't think there are any more (useful) premix bottles in the Hall A
> > racks.  Those that are left are partials -- I checked a few of them and
> > they only have 400--500psi in them.  Hardly worth the effort to move
> > them given the GEM gas consumption rate.
> > 
> > * Holly or Jack:  I will leave it you two to coordinate and purchase
> >      more premix if needed.  I think we all got the recent email from
> >      Purchasing that the (official) lead-time is now 21 days for most
> >      premix.  If we want premix gas for January, we should probably
> >      order ASAP.  (Unless there are orders that just haven't shown up
> >      yet?)
> > 
> > The current plan is to switch to nitrogen over the holiday break.
> > That may require one person to come on-site at the end of Dec to swap a
> > bottle.  John will contact Mark, et to ensure at least he and one other
> > GEM expert are on the 'Holiday access list' so they can take care of
> > this.
> > 
> > -- Brad
> > 
> 
-- 
Brad Sawatzky (he/him), PhD <brads at jlab.org> -<>- Jefferson Lab/ Hall C/C111
Ph: 757-269-5947  -<>-  Fax: 757-269-5235  -<>- Pager: brads-page at jlab.org
The most exciting phrase to hear in science, the one that heralds new
  discoveries, is not "Eureka!" but "That's funny..."   -- Isaac Asimov