| About This Archive | | DCHAS-L 2019 Index | | DCHAS-L Yearly Index | |
Check out Safety Emporium for your N95, N99, and face shield needs.
|
Previous by Date: Subject: [DCHAS-L] 4 more Re: [DCHAS-L] Regulations for Snorkels Date: Tuesday, February 26, 2019 at 10:35:13 AM Author: DCHAS Membership Chair <membership**At_Symbol_Here**DCHAS.ORG> |
Next by Date: Subject: Re: [DCHAS-L] 4 more Re: [DCHAS-L] Regulations for Snorkels Date: Tue, 26 Feb 2019 12:07:51 -0500 Author: Samuella Beth Sigmann |
The principle is that enclosure of the whole process is always best. For general chemistry work, I think that is the only sensible system.
But there are processes going on in your labs and maintenance departments for which that just won't work: welding, soldering, photo developing, or any process which requires people's eyes to be close to the work to observe.
That's when you need an industrial ventilation engineer (as opposed to HVAC) to use the principles in the ACGIH manual to design to the contaminant, the capture area, and the actual task. It's hard to find these engineers -- really hard. But once you find one, you have gold at the end of your rainbow.
Monona
-----Original Message-----
---
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
From: Harry J. Elston <helston**At_Symbol_Here**MIDWESTCHEMSAFETY.COM>
To: DCHAS-L <DCHAS-L**At_Symbol_Here**PRINCETON.EDU>
Sent: Tue, Feb 26, 2019 9:51 am
Subject: Re: [DCHAS-L] Regulations for Snorkels
Elston's best practice guidance: Use a laboratory chemical hood. "Snorkels" become highly ineffective in capture after a couple of inches from the opening. You can run the calculation yourself from the ACGIH Vent manual, but generally speaking, unless you're almost right on top of the thing you need to need to exhaust, it won't work well.
I abhor them as effective local exhaust ventilation for general chemistry work.
Harry
On Tue, Feb 26, 2019 at 8:36 AM Samuella Sigmann <sigmannsb**At_Symbol_Here**appstate.edu> wrote:
Oh Wise Ones -
---
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
Are there any flow or testing regulations (ANSI or otherwise) for
lab snorkels. Any best practice guidelines?
Thanks in advance,
Sammye
--
******************************************************************************
We, the willing, led by the
unknowing, are doing the
impossible for the ungrateful. We have done so much, for
so long, with so
little, we are now qualified to do everything with
nothing. Teresa
Arnold paraphrased from Konstantin Josef Jire=C4=8Dek
(1854 - 1918)
Samuella
B. Sigmann, MS, NRCC-CHO
Chair,
ACS Division of Chemical Health
& Safety,
2019
Senior
Lecturer/Safety Committee Chair/Director of Stockroom
Chemistry
Appalachian
State University
525
Rivers Street
Boone,
NC 28608
Phone:
828 262 2755
Fax:
828 262 6558
--
---
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+++++++
Harry J. Elston, Ph.D., CIH
Principal
Company Information
Google+
Twitter: **At_Symbol_Here**MidwestChemSafe
Previous post | Top of Page | Next post