From: Eugene Ngai <eugene_ngai**At_Symbol_Here**COMCAST.NET>
Subject: Re: [DCHAS-L] Compressed Air 'grade' question
Date: Fri, 27 May 2016 19:23:26 -0400
Reply-To: DCHAS-L <DCHAS-L**At_Symbol_Here**MED.CORNELL.EDU>
Message-ID: 007a01d1b86e$c57b71d0$50725570$**At_Symbol_Here**

According to 4th edition of Compressed Gas Handbook 1999 Grade D air has


Less 1000 ppm CO2, 10 ppm CO and 5 ppm oil, O2 19.5% - 23.5% bal N2


I don't know if it has changed for the 5th edition


I can send you the table of grades. Listserve rejected my e-mail with it in it. Send me a e-mail and I can forward


Eugene Ngai

Chemically Speaking LLC



From: DCHAS-L Discussion List [mailto:dchas-l**At_Symbol_Here**] On Behalf Of Shiel, Dan
Sent: Friday, May 27, 2016 6:32 PM
Subject: Re: [DCHAS-L] Compressed Air 'grade' question


Maybe it's Grade D breathing air he's thinking of?






Daniel Shiel, MBA, MS, CSP, CHMM, CPP

Director, Risk & Quality Management Services

Site Security Officer / Site DEA Compliance Designee

Pfizer La Jolla

10777 Science Center Drive

San Diego, CA 92121



Pfizer Internal Use


Those who mistake the unessential to be essential and the essential to be unessential, dwelling in wrong thoughts, never arrive at the essential.   --- Dhammapada 1.11




From: DCHAS-L Discussion List [mailto:dchas-l**At_Symbol_Here**] On Behalf Of Debbie M. Decker
Sent: Friday, May 27, 2016 2:44 PM
Subject: [DCHAS-L] FW: Compressed Air 'grade' question


Please excuse the cross-posting.


Hi gang:


Anyone have any ideas for Cody?  The google isn't very helpful.





-----------Original Message------------------


From: Cody
Sent: Wednesday, May 25, 2016 10:27 AM
To: Debbie M. Decker <dmdecker**At_Symbol_Here**>
Subject: Compressed Air 'grade' question


Good morning!

I have a question that I was hoping you could help me answer.

What is grade 4 compressed air? what standard is that grade referring to?

Basically I need to present my PI with some information on the quality of our building compressed air compared to other options.


Scott (Facility Manager) has told me that the building compressed air line delivers "Grade 4" compressed air, which he found out from the ladies and gentlemen who maintain the pumps in the basement.


I have not been able to figure out what set of standards compressed air is measured by. I've heard of 'medical grade' and 'scuba diving grade'.... but even those are confusing me now that I've looked into it more.


Any ideas?


Thank you and have a great Wednesday!



Debbie M. Decker, CCHO, ACS Fellow

Immediate Past Chair, Division of Chemical Health and Safety

University of California, Davis





Birkett's hypothesis: "Any chemical reaction

that proceeds smoothly under normal conditions,

can proceed violently in the presence of an idiot."



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