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Previous by Date: Subject: Re: [DCHAS-L] Need help on a ventilation problem Date: Friday, August 24, 2018 at 4:54:18 PM Author: Monona Rossol <0000030664c37427-dmarc-request**At_Symbol_Here**LISTS.PRINCETON.EDU> |
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Monona,
Have there been enough studies done on the gas phase products of cutting various materials with large laser cutters to really answer your original question?å Somehow I doubt it.å
Two specific examples come immediately to mind. First, given the multiple oxidation states possible with many metals, I have to wonder if reactive species including nitrides might be formed.å Second, given the amazing thermal stability of TCDD, does it form during the cutting of chlorine-containing materials such as PVC or PVDC.
One example I did find is given below.
https://www.researchgate.net/publication/233244349_Laser_cutting_of_Kevlar_A_study_of_the_chemical_by-products
Ed Sare
--------------------------------------------
On Fri, 8/24/18, Monona Rossol <0000030664c37427-dmarc-request**At_Symbol_Here**LISTS.PRINCETON.EDU> wrote:
Subject: Re: [DCHAS-L] Need help on a ventilation problem ---
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To: DCHAS-L**At_Symbol_Here**PRINCETON.EDU
Date: Friday, August 24, 2018, 4:54 PM
The only thing I am
concerned about is the fire or explosion hazards. I think
there probably are none but don‰??t want to be wrong.
å Mononaå
-----Original Message-----
From: James Saccardo
To:
DCHAS-L
Sent:
Fri, Aug 24, 2018 02:39 PM
Subject: Re:
[DCHAS-L] Need help on a ventilation problem
Hi Monona, The hypothetical of
incompatible exhaust streams is difficult to
answer.
Instead, I would put those
considerations into design ‰?? for instance, what could be
the worst result? Fire, corrosion, something
else.
Is there fire protection,
anti-corrosion surfaces?
Consider designing the duct so
that it can be inspected periodically and perhaps cleaned at
5 or 10 year intervals.
Allowing them to be disconnected
in sections or at the instrument and rinsed with water,
disposing of the water in accordance with all local
regulations.
James
å
From: ACS Division of Chemical Health
and Safety [mailto:DCHAS-L**At_Symbol_Here**PRINCETON.EDU]
On Behalf Of Michael
Sent: Tuesday, August 21, 2018 8:49 AM
To: DCHAS-L**At_Symbol_Here**PRINCETON.EDU
Subject: Re: [DCHAS-L] Need help on a ventilation
problem
å
Try contacting the
manufacturer of the LCs. Equipment manufacturers will often
sell local exhaust attachments for their machines or tell
you who might.
å
Mike Buczynski
Sr EHSAdvisor
Product Stewardship,Regulatory Affairs
Afton Chemical
Richmond VA
On Aug 21, 2018, at 8:42 AM, Daniel C Herrick
wrote:
Hi Monona,
å
It would seem to
me that the hazards of ventilating these two laser cutters
together should be minimal (though I don‰??t have any data
to ‰??prove‰?? this) since as you note the metal fume should
be metal oxide fume almost immediately I would
å think. å One suggestion could be to restrict metal cutting
to only be done on the laser cutter furthest downstream aka
closest to the exhaust? å Though wood particulate from the
other LC could still intermingle so maybe this would make no
difference. å And any
å ‰??restriction‰?? like that would likely only work in a
staffed space...much more difficult in a student-run
environment (though possible with diligent enough
students).
å
I‰??m just glad to
hear they (whoever They are) are going to ventilate their
laser cutters properly with ducted exhaust!
å
Dan
å
(from the ACS National Meeting
in Boston where I‰??ve been extolling the virtues of DCHAS,
in particular the DCHAS-L as an amazing resource (thanks to
Ralph and Rob and the many others who help make the listserv
å go), and where Monona Rossol‰??s name has come up several
times as an amazing resource as well)
----------------------------------
Daniel C. Herrick,
CIH
Senior EHS
Coordinator, MIT MechE
herrickd**At_Symbol_Here**mit.edu
617-253-2338;å Room 3-449g
http://ehs.mit.edu
On Aug 21, 2018, at 7:56 AM, DCHAS Membership Chair
wrote:
From: Monona
Rossol
Re: Need help on a ventilation problem
I‰??ve been asked if two large laser cutters can be
branch-ducted together. The problem is they will be used to
cut wood, plastic, leather, and metal at various times. This
means metal fumes can be in the ducts at the same time as
smoke from potentially combustible
å materials. Since the metal will be in a fume, that is, a
metal oxide form, it isn‰??t clear that the combination
would be hazardous.
Any and all opinions on the potential hazards or lack
thereof are eagerly awaited.
Monona Rossol in Amherst teaching the art safety course.
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