[labnetwork] Toxic gases

[Nathanael Sieb]

Hi Manish,

I tend to concur with that statement.  We leave all of our gases on 24/7 
and we have automatic shut-offs on the toxics if there are issues (gas 
leak, power loss, excess flow, etc.).  We only close the valve when we 
are changing cylinders, and that is followed by leak checks in case 
there is a valve failure.  Constant use of the valves is a potential 
failure point, though I'm sure the cylinders are built for it.

Thanks,
Nathanael

On 2020-12-04 2:11 p.m., Manish Keswani wrote:
>
> Happy Friday everyone,
>
>
> I have a question related to toxic gases in our nano fabrication center.
>
> We typically shut off our toxic gases at the source when not in use, 
> using the in line valves on the Safety Manifolds, the ESO valves, and 
> the cylinder valve. This is to comply with the administrative control 
> stated in our gas safety notes. The following question came up for 
> toxic gases. I would like to understand how this is being done at 
> other facilities and the reasoning behind it.
>
> “Is there a good reason we turn off the toxic gases at the end of the 
> day instead of just leaving them on? It seems like if there is a risk, 
> it would be wear and tear on the valves etc, plus someone going in 
> vault often to do it.”
>
> Thanks in advance,
>
> Manish Keswani
>
> Lawrence Livermore National Laboratory
>
>
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