From: Harry Elston <helston**At_Symbol_Here**MIDWESTCHEMSAFETY.COM>
Subject: Re: [DCHAS-L] Vacuum Chamber questions?
Date: Wed, 27 Apr 2016 13:43:15 -0500
Reply-To: DCHAS-L <DCHAS-L**At_Symbol_Here**MED.CORNELL.EDU>
Message-ID: 000301d1a0b4$ae630f20$0b292d60$**At_Symbol_Here**
In-Reply-To <51761600e925414cbf2fc53f32996a4b**At_Symbol_Here**>



My experience has been that you have very little to worry about regarding implosion risk with stainless or aluminum vacuum chambers operated at these pressures. Usually they welded at the seams, with bolted o-ring type connections. Typical failure points are the o-rings that become brittle over time and will start to leak.


Keep in mind that vacuum chambers are designed for reduced pressure operations. They do not do well when you pressurize them and many of the connection points become failure points/projectiles at elevated pressure (greater than atmospheric pressure), an may include catastrophic failure.




From: DCHAS-L Discussion List [mailto:dchas-l**At_Symbol_Here**] On Behalf Of Smallbrock, Margaret A.
Sent: Wednesday, April 27, 2016 1:09 PM
Subject: Re: [DCHAS-L] Vacuum Chamber questions?




I just got the response back from my researcher as to the material it will be comprised of and expected pressure.


The material most likely will be stainless steel with a vacuum of between 0.01 and 0.1 torr.


Thank you for the help,




From: DCHAS-L Discussion List [mailto:dchas-l**At_Symbol_Here**] On Behalf Of Harry J. Elston
Sent: Wednesday, April 27, 2016 11:24 AM
Subject: Re: [DCHAS-L] Vacuum Chamber questions?


Margaret - what are the proposed materials of construction and what is the proposed pressure in the chamber?  Answers to both of these questions are essential before we get to your question.




On Wed, Apr 27, 2016 at 11:26 AM, Smallbrock, Margaret A. <Margaret.Smallbrock**At_Symbol_Here**> wrote:

Greetings all,


I have a researcher who is proposing to build a vacuum chamber in his lab that is an evacuated tube that is 4.5 m in length and approximately 30 cm in diameter. What immediately came to mind is implosion concerns, shielding for the user, room shielding (basement lab)? Should pressure testing of the equipment be required?


If you have worked with this before or something similar, would you be willing to share? Any lessons learned or SOPs that may be helpful?


Thank you,


Margaret Smallbrock

Campus Environmental Health and Safety Manager

Environmental Health & Safety

South Dakota School of Mines

501 East St. Joseph Street

Rapid City, SD 57701-3995


605-394-5837 FAX





Harry J. Elston, Ph.D., CIH
Company Information
Twitter: **At_Symbol_Here**MidwestChemSafe

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