From: Tammy M. Lutz-Rechtin <tlutzrec**At_Symbol_Here**UARK.EDU>
Subject: Re: [DCHAS-L] Pressurization of 5 gallon glass carboy
Date: Thu, 24 Feb 2022 16:38:04 +0000
Reply-To: ACS Division of Chemical Health and Safety <DCHAS-L**At_Symbol_Here**Princeton.EDU>
Message-ID: SA0PR04MB744906C5D05CB25656ECE3EDBA3D9**At_Symbol_Here**SA0PR04MB7449.namprd04.prod.outlook.com
In-Reply-To <678199F8-23D6-4C1D-92D8-D908C88A8B7B**At_Symbol_Here**keene.edu>
Demystify:
It is hard to comment with specifics because of the big unknowns in the description "gas demonstrations." Firstly, the integrity of the new glass vessels could be affected by the etching. The real pressure it can handle will depend on the temperature of the
demonstration and wall thickness. Larger vessels tend to have lower ratings unless the thickness is substantially increased. If
the demonstrator is worried about pressure, then I suggest three things (1) hydrostatic testing before use (2) don't use it over 25 psi max. and (3)
add a sized pressure relief device to prevent over-pressurization.
Tammy Rechtin, Ph.D.
Chemical Engineering Safety Coordinator
Ralph E. Martin, Department of Chemical Engineering
University of Arkansas
From: ACS Division of Chemical Health and Safety <DCHAS-L**At_Symbol_Here**Princeton.EDU> on behalf of Ralph Stuart <ralph.stuart**At_Symbol_Here**KEENE.EDU> Sent: Thursday, February 24, 2022 10:14 AM To: DCHAS-L**At_Symbol_Here**Princeton.EDU <DCHAS-L**At_Symbol_Here**Princeton.EDU> Subject: [DCHAS-L] Pressurization of 5 gallon glass carboy
One of our faculty member was doing due diligence inspections on inherited equipment he uses in the physical chemistry lab for gas demonstrations. He found some defects in glass 5 gallon carboys, so ordered replacements. They arrived
from DWK-Kimble with precautions etched on the outside, including "Do not evacuate or pressurize unless recommended in the current DWK Kimble catalog." Unfortunately, the catalog does not contain any information about pressurizing or evacuating the carboys.
It simply says that the carboys are "Ideal for storage and dispensing of solutions."
There are no discernible design differences between the new carboys and the older ones. I wonder if anyone on the list has experience with assessing the risk associated with gas pressure differences with this equipment?
Thanks for any information on this.
- Ralph
Ralph Stuart, CIH, CCHO
Environmental Safety Manager
Keene State College
603 358-2859
ralph.stuart**At_Symbol_Here**keene.edu
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