[Dsg-mvt] Request new manometer for Eel premix gas system + interlock

[Franck Sabatie]

Brian,

Thanks for your input: I think the current manometer probably has a problem
then since we never saw anything out of a full premix bottle. 300 out of
4000 psi we should see.

Franck

Le jeu. 8 juin 2017 à 17:07, Brian Eng <beng at jlab.org> a écrit :

> Hi Franck,
>
> The pressure should be around 300 psi on a new bottle (depending on the
> temperature).
>
> Changing that gauge with a different one would require DA approval. I've
> CC'd Matt so he can chime in. We (DSG / as pressure system technicians) can
> only change a component for the exact part number when requested to by the
> system owner (Bob Miller).
>
> George already looked and he doesn't have an appropriate gauge. If this is
> a time critical item we can order it via webstock (it should be here in a
> day or two) once we have a part number from Matt.
>
> Thanks
> --
> Brian Eng
> Detector Support Group
> 757-269-6018
>
> > On Jun 8, 2017, at 4:43 PM, Franck Sabatie <sabatie at jlab.org> wrote:
> >
> > Hello,
> >
> > as was pointed out several times before, the current Eel premix gas
> cylinder uses a manometer that goes up to 4000 psi full scale.
> >
> > A full premix cylinder reads 0 on that scale: this is useless to check
> if the bottle is empty or not.
> >
> > It is URGENT to change this manometer so that we know when to change the
> cylinder. I'm not sure what is the pressure expected on those bottles,
> George probably knows.
> >
> > Then a procedure has to be put in place to change the cylinder: someone
> (to be defined) has to check every day the manometer and act accordingly.
> This has to be discussed within the DSG.
> >
> > Note that there is currently no interlock between the gas system and the
> HV. If no gas flows through the system, it may eventually trip the HV. It
> should not damage the system but it's still problematic. Such an interlock
> will be developed this summer (maybe Wesley and Nathan can figure out how
> to do that through EPICS). In the meantime, Wesley will put in place an
> EPICS alert through an automated email sent to some email addresses
> (dsg-mvt included) when no gas pressure / flow is detected at the entrance
> of the gas system. Several people will know how to turn off the HV of the
> MVT system when they receive this email and they should !
> >
> > Thank you,
> > Franck
>
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