Note that ASME defines a pressure vessel as meeting all of the requires below

=E2=80=A2 Pressure greater than 15 psig

=E2=80=A2 Internal diameter greater than 6"

• Internal volume greater than one gallon

For example a 4" dia pipe with end caps even if it was larger than 1 gal and used at 30 psig does not meet the requirements

As a best practice many companies will apply the requirements to even smaller vessels

These must be designed, fabricated and inspected per ASME requirements. They are then registered with the national board.

Gas cylinders are not ASME pressure vessels, they are made to DOT specifications. Some cylinders however will be made to both requirements as they are used for transportation as well as in a system as a process vessel.

Eugene Ngai

Chemically Speaking LLC

www.chemicallyspeakingllc.com

From: ACS Division of Chemical Health and Safety <DCHAS-L**At_Symbol_Here**Princeton.EDU> On Behalf Of Chandra Man Karki
Sent: Wednesday, March 17, 2021 3:53 PM
To: DCHAS-L**At_Symbol_Here**Princeton.EDU
Subject: Re: [DCHAS-L] Question for posting on DCHAS List

Hello Todd,

Currently, I=E2=80™m also assisting one of the PIs to write SOP for the pressure vessel (>15 PSI). Pressure vessels are regulated by state law if the pressure is greater than 15 psi (for most states). Your state fire marshal (division of boilers and pressure vessel) is the best resource in this case.

-Chandra Man

Chandra Man Karki, M.S..

Chemical Safety Officer (CSO)

Office of Research Safety, University of Chicago

researchsafety.uchicago.edu

920 E. 58^th St, CLSC 145, Chicag, IL 60637

Office Ph: (773) 702-5907

"Safety isn't expensive, it's priceless"- Jerry Smith

UCHICAGO COVID update: https://goforward.uchicago.edu/

From: ACS Division of Chemical Health and Safety <DCHAS-L**At_Symbol_Here**Princeton.EDU> On Behalf Of Todd Numan
Sent: Wednesday, March 17, 2021 11:16 AM
To: DCHAS-L**At_Symbol_Here**Princeton.EDU
Subject: [DCHAS-L] Question for posting on DCHAS List

Good Afternoon,

My name is Todd Numan and I am an EHS Safety Officer at MIT. I am in the process of updating some of our program guidance documents on pressure vessel use and was hoping that I could have a question posted on the DCHAS list for comments. We have current list members on my team so I will have access to any comments or conversations.

The following question is what I was hoping to have posted;

- We are currently in the process of updating our pressure vessel program guidance documents and would like to benchmark against best practices from other universities. For those of you that have a pressure vessel program, what techniques do you use to track and monitor researcher built systems, and what is your criteria for categorizing low/medium/high hazard potentials?

Please let me know if you have any questions or concerns..

Best,

Todd

Todd Numan

EHS Safety Officer

Environment, Health and Safety Office

Massachusetts Institute of Technology

Office - (617)258-8101

Mobile- (617)335-7439

**Safety should not be considered a priority but a value with no compromise**

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--- For more information about the DCHAS-L e-mail list, contact the Divisional membership chair at membership**At_Symbol_Here**dchas.org Follow us on Twitter **At_Symbol_Here**acsdchas

--- For more information about the DCHAS-L e-mail list, contact the Divisional membership chair at membership**At_Symbol_Here**dchas.org Follow us on Twitter **At_Symbol_Here**acsdchas