From: Frank Geurts (geurts_at_rice.edu)
Date: Tue Mar 11 2003 - 10:32:15 EST
Jeff, Greg
like i told Greg last night the isobutane pressure is very sensitive on
the temperature (not pressure) esp. if the temp. falls below 30F like it
did last night. As long as the temperature doesn't get too close to the
boiling point the flow (of only 3.5ccm) is hardly affected (we use
flowcontrollers): I checked the flow rates last night and checked this
morning's history again just now ... no changes at all.
thanks,
Frank
Gregory Leif Rakness wrote:
> Hi TOF group,
>
> Here on shift at BNL we are monitoring the gas system for the TOFr. The
> question we have is about the isobutane pressure measurement. We are
> diligently monitoring the flow and waiting for alarms, although the flow
> is still going strong at ~3.5 (units unknown). We talked to Frank Guerts
> and he was saying that low pressure is OK as long is there is flow, and
> supposes that the isobutane has possibly become liquid (it is cold
> outside, although not _that_ cold), so that the pressure would be zero.
> I just don't understand how one could have gas flow with zero pressure.
>
> It is probable that the answer to this question is obvious, and I am just
> a confused shift leader.
>
> Greg
>
> ----------------------------------------------------------------------
> Greg Rakness telephone: (812)855-2949
> Indiana University Cyclotron Facility fax: (812)855-6645
> 2401 Milo B. Sampson Ln.
> Bloomington, IN 47408 private: (812)327-5426
> rakness_at_iucf.indiana.edu
> ----------------------------------------------------------------------
>
>
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