[labnetwork] Automated Emergency shutoff valve

[Dennis Schweiger]

So, your project manager wants to put this rotary valve operator in the
cabinet, as a means to shut off the cylinder?  We had those in our early
Air Products cabinets, they were problematic, and we eventually just
defeated them.  None of our cylinder cabinets have them now.  It would make
more sense to go to an air operated DISS cylinder valve (see page 2 in the
attachment), and have the DISS portion prepped for a restrictive flow
orifice.  In addition to this, I would look at the gas usage, and "right
size" the cylinder volume of gas so that your cylinder change out cadence
is about 12-18 months.  That might mean that you'd need to have a cylinder
short filled.  This reduces your exposure risk in the event there is some
type of catastrophic failure in your delivery system.

There is no way I'd add another complex mechanical system (rotating
cylinder shut off) into our HPM cabinets, when there are way better
solutions out there.

Dennis

734.647.2055 Ofc

"People can be divided into 3 groups - those that make things happen, those
that watch things happen, and those that wonder what happened."  Within
which group do you belong?

On Thu, May 14, 2015 at 4:26 PM, Matthieu Nannini, Dr. <
matthieu.nannini at mcgill.ca> wrote:

>  Dennis,
>
>  Yes. All are in exhausted gas cabinet. When I presented the safety
> mechanism to the project manager here, showing him the shutoff valve in the
> pigtail just before the panel, he mentioned that there was still a weak
> point between this valve and the actual cylinder rotary valve itself. If a
> leak occurs at the rotary valve or the CGA/DISS connection or at the
> pigtail nothing can stop it. Hence the shutoff valve on the cylinder rotary
> valve idea from the project manager.
>
>  Matthieu
>
>  Le 2015-05-14 à 16:14, Dennis Schweiger <schweig at umich.edu> a écrit :
>
>  Matthieu,
>
>  are you using gas cabinets to house your HPM cylinders?  If so, why
> wouldn't you use the shutoffs in the cabinets to perform this functionality?
>
>  DennisSchweiger
> University of Michigan/LNF
>
> 734.647.2055 Ofc
>
> "People can be divided into 3 groups - those that make things happen,
> those that watch things happen, and those that wonder what happened."
> Within which group do you belong?
>
> On Thu, May 14, 2015 at 1:02 PM, Matthieu Nannini, Dr. <
> matthieu.nannini at mcgill.ca> wrote:
>
>> Collegues,
>>
>>  Our facilites dept. is reviewing our operations before a
>> « used-to-be-not-so-major » renovation. They are flirting with this idea of
>> installing Emergency Gas Cylinder Valve shutoff like sold by the following
>> company: http://www.halogenvalve.com/
>> These valves would be hooked up to our TGMS.
>>
>>  Any of you has such an installation ? Anyone could comment ?
>>
>>  Thanks
>>
>>  -----------------------------------
>> Matthieu Nannini
>> McGill Nanotools Microfab
>> Manager
>> t: 514 398 3310
>> c: 514 758 3311
>> f: 514 398 8434
>> http://mnm.physics.mcgill.ca/
>> ------------------------------------
>>
>>
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>>
>>
>
>
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