On Oct 19, 2019, at 18:42, Eugene Ngai <eugene_ngai**At_Symbol_Here**COMCAST.NET> wrote:

DOT lists the requirements for periodic inspection of cylinders in

 

49CFR =A7 180.209 - Requirements for requalification of specification cylinders.

 

After a cylinder has been tested, it must be stamped with the month and year that it was inspected/tested. The oldest date is when it was first manufactured. Up until early 2000 the test company had a unique symbol in between the month and the year. DOT converted this into a 4 digit alphanumeric code that is registered with DOT.

 

High pressure cylinders if properly tested and maintained can safely last over 100 years. Many are from the US Navy from WW1

 

One of the questions many people ask is it safe to use the cylinder after the hydrotest date? The DOT regulations prohibits filling of it after the date. A gas supplier can fill and have it in inventory and legally ship it for use. I audited a National Lab that had a cylinder from 1955 that they took out once a year for use as a reference standard.

 

ACS requested that I write an article on specialty compressed gases which I have agreed to do for 2020

 

 

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 James Kaufman
Sent: Saturday, October 19, 2019 11:30 AM
To: DCHAS-L**At_Symbol_Here**PRINCETON.EDU
Subject: Re: [DCHAS-L] New Article

 

We find that many compressed gas cylinder users are not familiar with the cylinder markings for hydrostatic testing.  

 

Air Products' "SafetyGrams" are a good resource for more information about individual gases, the equipment, valves, regulators, cryogenics, emergencies and much more. ... Jim

. 

PS.  "There's more to lab safety than just labs!"

James A. Kaufman, Ph.D.

Founder/President Emeritus
The Laboratory Safety Institute (LSI)
A Nonprofit Educational Organization for Safety in Science, Industry, and Education

192 Worcester Street, Natick, MA 01760-2252
508-647-1900  Fax: 508-647-0062  
Cell: 508-574-6264  Res: 781-237-1335
Skype: labsafe; 508-401-7406 

jim**At_Symbol_Here**labsafety.org  www.labsafety.org

Teach, Learn, and Practice Science Safely

 

 

 

On Sat, Oct 19, 2019 at 7:22 AM Richard Palluzi <000006c59248530b-dmarc-request**At_Symbol_Here**lists.princeton.edu> wrote:

I thought some of the membership might be interested in the following article:

 

"But it's More Expensive!": Tubing or Pipe for Pilot Plants at https://www.linkedin.com/pulse/its-more-expensive-tubing-pipe-pilot-plants-richard-palluzi/?published=t

Compressed Gas Cylinder Safety In Research Applications at https://www.linkedin.com/pulse/compressed-gas-cylinder-safety-research-applications-richard-palluzi/

 

 

Richard Palluzi 

PE, CSP

 

Pilot plant and laboratory consulting, safety, design,reviews, and training

www.linkedin.com/in/richardppalluzillc/

 

Richard P Palluzi LLC

72 Summit Drive

Basking Ridge, NJ 07920

rpalluzi**At_Symbol_Here**verizon.net

908-285-3782

 

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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