From: Geary Eppley (eppley_at_physics.rice.edu)
Date: Mon May 19 2003 - 16:10:43 EDT
Hi Howard and Dick,
Zhangbu is not around this week but we have two knowledgeable shift leaders
this week who could back off the gauge pressure on the TOF isobutane
regulator. This is not essential since I don't think the pressure can get
high enough to damage the gauge. We try to keep the gas pressure at about
one atmosphere out of the regulator. Dick I believe already knows where
the TOF isobutane is. It is in the rack with the TPC test gasses, just
toward the gas room from the TPC methane. The isobutane is a size G bottle
with 11 lbs of product when full. If you have a spare moment, you can back
off the regulator a few clicks. It can't be backed off very far since it
is nearly open. It will take several hours to see the pressure drop since
the flow rate is 3.5 ccm.
If you don't want to fool with this, it should not make any difference.
Cheers,
Geary
On Mon, 19 May 2003, Geary Eppley wrote:
> Hi Frank,
>
> I won't be back at BNL until 5/22. I don't think the pressure will get
> high enough to damage the gauge but if Zhangbu could reduce the pressure a
> few clicks it wouldn't hurt. This has to be done slowly and it will take
> several hours to see any results.
>
> Geary
>
>
> On Mon, 19 May 2003, Frank Geurts wrote:
>
> > Geary and/or Zhangbu,
> > i got a phone call from SCR: apparently the pressure of the
> > isobuthane(?) has gone up from 30 to 32psi and according to the current
> > shiftleader somebody told him that the pressure should not go above
> > 30psi. The pressure history typically is somewhere between 15-20psi.
> >
> > Zhangbu, could you at some point (or Geary if he's back from CERN) check
> > the pressure on the bottles and maybe lower it a little.
> >
> > thanks,
> > Frank
> >
> >
> >
>
>
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