From: ILPI Support <info**At_Symbol_Here**>
Subject: Re: [DCHAS-L] Compressed Air 'grade' question
Date: Fri, 27 May 2016 18:47:01 -0400
Reply-To: DCHAS-L <DCHAS-L**At_Symbol_Here**MED.CORNELL.EDU>
Message-ID: BA92B741-714B-4D46-B284-AE08BB50ECA4**At_Symbol_Here**

Found these, but no grade 4 is listed:

I would suggest contacting one of those companies.

Curiously, CGA has letter grades rather than numeric ones per CGA G-7.1

Unless you're a member or subscriber you have to pay to see CGA G-7.1:

However, I doubt a building compressed air system is meant to deliver breathing air (is Grade D what this person was told is Grade 4?).  So again, I'd look to one of those first two links for answers.


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On May 27, 2016, at 5:43 PM, Debbie M. Decker <dmdecker**At_Symbol_Here**UCDAVIS.EDU> wrote:

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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