[labnetwork] TTIP Cylinder Overheated - Request for Advise

[Hathaway, Malcolm R]

Hello All,

Thanks for all the good comments and suggestions.

As several of you (and our own EHS) suggested, we have entrusted the cylinder to our toxic waste removal company.  We are still a bit leery of sending out a potentially pressurized cylinder (albeit a small one) to be disposed of by possibly rough methods, but that is what was recommended.

If we hear any additional news about it's final disposition, I'll be sure to let everyone know.

Again, thanks for all the help and good recommendations.


Mac Hathaway
Harvard CNS
________________________________
From: Collins, Deon <deonc69 at illinois.edu>
Sent: Thursday, July 20, 2023 2:55 PM
To: Hathaway, Malcolm R <hathaway at cns.fas.harvard.edu>; Labnetwork Mailing List <labnetwork at mtl.mit.edu>
Subject: RE: TTIP Cylinder Overheated - Request for Advise


I would have the bottle disposed of ASAP. The structural integrity of the cylinder has been compromised.



Deon D. Collins

FACILITY MANAGER

The Grainger College Of Engineering UIUC
Holonyak Micro & Nanotechnology Lab
208 N Wright St Rm. 1114 | MC-249
Urbana, IL 61801
217-300-7531 | deonc69 at illinois.edu<mailto:deonc69 at illinois.edu>


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From: labnetwork <labnetwork-bounces at mtl.mit.edu> On Behalf Of Hathaway, Malcolm R
Sent: Tuesday, July 18, 2023 4:52 PM
To: Labnetwork Mailing List <labnetwork at mtl.mit.edu>
Subject: [labnetwork] TTIP Cylinder Overheated - Request for Advise



Hey all,

We (not CNS, but another lab) have an issue with a TTIP cylinder (Cambridge Nano/swagelok-style) which got over-heated to an unknown temp, whereupon the bottle acquired a bulge.  It was closed at the time, and so is still under pressure to an unknown degree.  The bottle label melted, for reference.

Questions:

Are the contents likely to be decomposition products?
Would these products be flammable or explosive?
Can a bottle burst under the flexural stress of slow depressurization?
Is there a safe way to depressurize?

We came up with the idea of attaching a second valve (these are all VCR), and alternating opening inner valve (then closing) and opening outer valve (then closing), to step-wise vent the bottle.  Has anyone heard of such a technique causing the bottle to burst along the way?

Suggestion welcome.


Mac

--

Mac Hathaway

Senior Process and Systems Engineer

Harvard Center for Nanoscale Systems

11 Oxford St.

Cambridge, MA  02138

617-495-9012


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