[labnetwork] Smoke detectors in the clean room

[Abbie Gregg]

Cleanrooms are indeed notorious for too much dilution of smoke to detect it. That is why VESDA and similar systems need MULTIPLE points of detection that are in the air path. A model of air flow in the cleanroom would help to determine the best places to locate the very sensitive smoke detectors needed (eg, VESDA or similar). Probably in your case the air with the small amount of smoke did not pass close enough to the sensors, or they were not sensitive enough, or both. You likely would have needed quite a few more sensors to detect it, as well. We would have to know more about your air handlers and the exact room layout and where the fire was actually located that went un- detected. What caused someone to finally notice the fire or smoke?

Abbie Gregg
President
Abbie Gregg, Inc.
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From: labnetwork-bounces at mtl.mit.edu [mailto:labnetwork-bounces at mtl.mit.edu] On Behalf Of julia.aebersold at louisville.edu
Sent: Monday, March 30, 2015 5:15 PM
To: Labnetwork
Subject: Re: [labnetwork] Smoke detectors in the clean room

I bet Abbie Gregg has a good response for the code standards here in the US.


Cheers!



Julia Aebersold, Ph.D.

MNTC Cleanroom Manager

University of Louisville

2210 South Brook Street

Shumaker Research Building, Room 233

Louisville, KY  40292



(502) 852-1572

http://louisville.edu/micronano/<http://louisville.edu/micronano>



________________________________
From: labnetwork-bounces at mtl.mit.edu<mailto:labnetwork-bounces at mtl.mit.edu> [labnetwork-bounces at mtl.mit.edu] on behalf of Mike Young [myoung6 at nd.edu]
Sent: Monday, March 30, 2015 9:26 AM
To: Labnetwork
Subject: Re: [labnetwork] Smoke detectors in the clean room
Unless I am missing something, in most jurisdictions, this is determined entirely by the applicable building and/or fire code(s). Cleanroom management generally have no say in the matter.

--Mike


On Mar 30, 2015, at 5:49 AM, savitha.p <savitha.p at ece.iisc.ernet.in<mailto:savitha.p at ece.iisc.ernet.in>> wrote:

Hi!

We had a fire recently inside the cleanroom and our smoke detectors did not give any warning even though the fire was burning for ~5min before it was put out. We currently have smoke detectors, a VESDA system installed inside the room with 3 detectors, one at the plenum level, one in the room and one under the raised floor (room is square shaped with ~700 sq.ft area, Class 1000).

We were wondering how the other fabs handle these kind of situations. What is the ideal distance between smoke detectors and how do you ensure that the smoke is driven over the detectors no matter what the location of the fire is.

Please let us know your thoughts on this matter.

Thanks and regards,

Savitha

____________________________________________


Dr.Savitha P,
Technology Manager
National Nanofabrication Centre,
Centre for Nanoscience and Engineering
Indian Institute of Science
Bangalore - 560012
India.
Ph: +91 80 2293 3254
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--
Michael P. Young                                (574) 631-3268 (office)
Nanofabrication Specialist                      (574) 631-4393 (fax)
Department of Electrical Engineering            (765) 637-6302 (cell)
University of Notre Dame                         mike.young at nd.edu<mailto:mike.young at nd.edu>
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