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Matthieu:<br>
<br>
While I have no specific experience with this particular emergency
gas shutoff valve, I've got a bit of experience with some things
that send remote shutoff signals to cylinders. Before I share my
experiences with you, I want to make sure that I understand how your
are hoping or planning to use this valve. To be honest, if all of
the details have been handled properly, this seems to be a pretty
clever approach.<br>
<br>
On what gases are you planning on using this valve? They are
clearly advertising it for use with chlorine but it is not clear
that it will work with other CGA and tank valve configurations
(including cylinders equipped with DISS fittings). While automated
shutoff would also be attractive with many of our toxic friends, I'd
be very leery of using this with silane, germane, DCS, hydrogen,
ammonia, or methane ... or anything this is flammable ... for fear
that the motor (which could be in close proximity to a leak) is not
designed/rated for such use and could ignite a fire before it got
your cylinder closed.<br>
<br>
Second, is this likely to be used in gas cabinets? And do those
cabinets already have a pneumatically controlled valve that shuts
off the gas somewhere in the pigtail before it gets to the
regulator? If so, have you worked out the details of how this
automatic valve would work in concert with the pigtail valve both in
emergency shutdown situations and in normal bottle change events?<br>
<br>
I do like being able to shut cylinders remotely ... in addition to
gas detection shutdowns, seismic shutdowns, and signals from fire
alarms, smoke detectors, etc., we have a total of 14 "break glass"
emergency shutdown switches scattered throughout our lab that are
located in any area where a gas leak could happen. These just
become digital inputs into our TGMS PLC. That gives us a convenient
way of shutting down all gases quickly and remotely .... even if a
gas detector hasn't "smelled" anything.<br>
<br>
While most of our gas cabinets still use only pneumatically
controlled shutoff valves in the pigtail we are gradually migrating
to use of pneumatic cylinder valves. We currently use pneumatic
valves on all of our 100% germane and silane cylinders. I like
being able to shut those gases at the cylinder rather than pretty
close to the cylinder ... particularly since a lot of leaks occur at
the CGA/DISS connection. Our gas cabinets have front panel
selection of whether we are using pneumatic cylinder valves or hand
wheels ... so that is convenient for us. I'm not sure that
pneumatic cylinder valves are common on all gases and in all
locales, so that may not be an option for all. Where pneumatic
cylinder valves aren't available or a viable option, I think that
this motor drive is a clever approach and worth exploring ...
particularly if it can be use on just about any CGA connection and
cylinder valve. I'd feel even better about it if it were rated
Class 1 Div 2 so that it could be used on more flammable/pyrophoric
gases ...<br>
<br>
I'll be curious to hear if our gas handling friends at Critical
Systems and some of the other folks with much gas handling
experience have to say ... but I think that anything that allows you
to close a cylinder without having your nose 15 cm from the CGA
connection is worth some careful exploration.<br>
<br>
Let me know if you have any further questions and good luck with
your renovation.<br>
<br>
John<br>
<br>
<br>
<div class="moz-cite-prefix">On 5/14/2015 10:02 AM, Matthieu
Nannini, Dr. wrote:<br>
</div>
<blockquote
cite="mid:405ACE07-D5DE-43B6-A81C-9D00C36B62DF@mcgill.ca"
type="cite">
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Collegues,
<div><br>
</div>
<div>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: <a moz-do-not-send="true"
href="http://www.halogenvalve.com/">http://www.halogenvalve.com/</a></div>
<div>These valves would be hooked up to our TGMS.</div>
<div><br>
</div>
<div>Any of you has such an installation ? Anyone could comment ?</div>
<div><br>
</div>
<div>Thanks</div>
<br>
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-----------------------------------
<div>Matthieu Nannini<br>
McGill Nanotools Microfab<br>
Manager<br>
t: 514 398 3310<br>
c: 514 758 3311<br>
f: 514 398 8434<br>
<a moz-do-not-send="true"
href="http://mnm.physics.mcgill.ca/">http://mnm.physics.mcgill.ca/</a><br>
------------------------------------</div>
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<br>
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