This would be a good time to have the students work with the Engineering Department and perform a hazard analysis on the P&ID and then a pre-startup hazard inspection on the as built P&ID and the actual unit.
This would be an opportunity to cross-educate some chemistry students in engineering safety and some engineering students in chemistry.
The information contained in this message is privileged and confidential and protected from disclosure. If the reader of this message is not the intended recipient, or an employee or agent responsible for delivering this message to the intended recipient, you are hereby notified that any dissemination, distribution or copying of this communication is strictly prohibited. If you have received this communication in error, please notify us immediately by replying to the message and deleting it from your computer.
ACSafety has a new address:
NEAL LANGERMAN, Ph.D.
ADVANCED CHEMICAL SAFETY, Inc.
PO Box 152329
SAN DIEGO CA 92195
011(619) 990-4908 (phone, 24/7)
We no longer support FAX.
Please contact me before sending any packages or courier delivery. The address for those items is:
5340 Caminito Cachorro
San Diego CA 92105
From: DCHAS-L Discussion
List [mailto:dchas-l**At_Symbol_Here**MED.CORNELL.EDU] On Behalf Of Cody, Regina J.
Sent: Thursday, April 05, 2012 2:02 PM
Subject: Re: [DCHAS-L] Isobutane Safety -- Refrigeration Unit
Since the students are having the unit built and welded, they need to thoroughly leak check the unit before any use, preferably with a helium leak detector. Especially if they are also going to use ammonia as one of the gases. The flammability hazard should be considerably reduced if the unit is leak tight and the gas line connections are tight.
NASA Goddard Space Flight Center
From: DCHAS-L Discussion
List [mailto:dchas-l**At_Symbol_Here**MED.CORNELL.EDU] On Behalf Of marjorie.markopoulos**At_Symbol_Here**WRIGHT.EDU
Sent: Thursday, April 05, 2012 9:43 AM
Subject: [DCHAS-L] Isobutane Safety -- Refrigeration Unit
A couple of undergraduate students in Mechanical Engineering want
to make a Einstein-like refrigeration unit for their senior project.
(http://www.guardian.co.uk/science/2008/sep/21/scienceofclimatechange.climatechange -- it’s also on Wikipedia. These aren't the exact models, but it is the concept.)
They are seeking safety guidance from EHS. They want to use isobutene (0.337 kg), ammonia (0.21kg), and water (0.636kg) in the table-top system. They plan on building it in a chemical fume hood and they hope to eventually make it portable for demos.
The pressure will be no greater than 50psi and the unit will be built with stainless steel and welded together by a professional welder.
1. Has anyone had such a unit built and what safety requirements were in place:
2. PPE -- Should we
require a Nomex lab coat? Face shield, in addition to impact resistant
3. What's the best way to address the potential flammability issues? In a fume hood with the sash as low as possible. Any monitoring or sensing?
Any input that you may have will be helpful. I also don't want to miss any important questions that I should be asking them.
Thanks to you all in advance!
Marjorie Markopoulos, M.S.
Biological and Chemical Safety Officer
Department of Environmental Health & Safety
Wright State University
3640 Colonel Glenn Hwy.
047 Biological Sciences II
Dayton, OH 45435
Previous post | Top of Page | Next post