[Dsg-mvt] [Dsg-hallbgas] micromega gas mix pressures

[Francesco Bossù]

Hi

thanks, I put 5 l/h now.

Francesco


On 16/05/2018 15:41, Marc McMullen wrote:
> Francesco,
>
> If you have reduced flow at the flow meters, the demand flow must be
> reduced as well. Please change the BMT Flow Set point (on the MVT PLC
> gas controls interface) to the set point of your flow meters. This
> will automatically change the demand flow from the mixing system.
>
>
> Marc McMullen
> Physics Division
> Detector Support Group
> 7738
>
> ------------------------------------------------------------------------
> *From: *"Francesco Bossù" <fbossu at jlab.org>
> *To: *"Marc McMullen" <mcmullen at jlab.org>
> *Cc: *dsg-mvt at jlab.org
> *Sent: *Wednesday, May 16, 2018 9:35:35 AM
> *Subject: *Re: [Dsg-mvt] [Dsg-hallbgas] micromega gas mix pressures
>
> Hi,
>
> yes, we reduced the request at the flow-meters in the hall because we
> disconnected 6 detectors. Is is possible to reduced the set point? Can
> we do it from some panel in Clascss?
>
> Francesco
>
>
> On 16/05/2018 15:32, Marc McMullen wrote:
> > Hi Francesco,
> >
> > Your flow setpoint is 9.2 but your flow in/out is only 5.0/4.7 liter
> > per hour. So something is restricting on your end. So your system is
> > requesting more than your are taking, this is why pressure is building
> > in the tank. Is it possible that something is valved off?
> >
> >
> >
> > Marc McMullen
> > Physics Division
> > Detector Support Group
> > 7738
> >
> > ------------------------------------------------------------------------
> > *From: *"Francesco Bossù" <fbossu at jlab.org>
> > *To: *dsg-mvt at jlab.org
> > *Sent: *Wednesday, May 16, 2018 9:26:36 AM
> > *Subject: *Re: [Dsg-mvt] [Dsg-hallbgas] micromega gas mix pressures
> >
> > Hi Marc,
> >
> > yes, the MVT group needs gas until the end of the week for testing the
> > BMT.
> >
> > What is the simplest solution? We need to continue our test as soon as
> > possible.
> >
> > Thanks
> >
> > Francesco
> >
> >
> > On 16/05/2018 15:19, Marc McMullen wrote:
> > > Hi Morgan,
> > >
> > > Just for clarification, please contact the MVT group and ask them to
> > > check to see if their settings are appropriate. Our system will
> > > continue to supply the gas as long as it is requested, so the tank
> > > pressure will not decrease.
> > >
> > > Thanks,
> > >
> > >
> > > Marc McMullen
> > > Physics Division
> > > Detector Support Group
> > > 7738
> > >
> > >
> ------------------------------------------------------------------------
> > > *From: *"Marc McMullen" <mcmullen at jlab.org>
> > > *To: *"Morgan Cook" <mcookiv at jlab.org>
> > > *Cc: *dsg-hallbgas at jlab.org, dsg-mvt at jlab.org
> > > *Sent: *Wednesday, May 16, 2018 8:58:56 AM
> > > *Subject: *Re: [Dsg-hallbgas] micromega gas mix pressures
> > >
> > > Hi Morgan,
> > >
> > > It looks like there is some issue downstream of the mixing system. The
> > > signals used to supply gas to the barrel (B_DET_BMT_GAS_WANTGAS) is
> > > still set to supply the gas. But the pressure in the tank is at 20psi
> > > which is the interlock set point to flow 0 gas. So that pressure is
> > > too high. I am not sure if the MVT is trying to flow to the barrel on
> > > their end or not, but if they need flow some pressure has to be
> > > relieved. They either have to flow more gas down stream of tank or
> > > relieve the tank.
> > >
> > > The signals for the MVT forward tracker and the FTT are set so they
> > > will not request gas.
> > >
> > >
> > >
> > >
> > >
> > > Marc McMullen
> > > Physics Division
> > > Detector Support Group
> > > 7738
> > >
> > >
> ------------------------------------------------------------------------
> > > *From: *"Morgan Cook" <mcookiv at jlab.org>
> > > *To: *dsg-hallbgas at jlab.org
> > > *Sent: *Wednesday, May 16, 2018 8:22:53 AM
> > > *Subject: *[Dsg-hallbgas] micromega gas mix pressures
> > >
> > > Hi,
> > >
> > > Is there any particular reason why the Mix2_Press is twice it's 2 week
> > > average pressure and the Mix1_Press is running at 1/2 it's 2 week
> > average?
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