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May 17, 2009

                             []< ET NEWS                               
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    NEWS AND INFORMATION FOR THE FIRE PROTECTION ENGINEERING TEAM      
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 Issue No. 385  ISSN 1554-074X      http://www.etnews.org   5-17-2009  
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Contents
--------
- News
- Journal
- Employment
- Seminar Schedule
- Comments & Acknowledgements 
 
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NEWS
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Donation of man's estate stuns Harvard fire officials
Northwest Herald - Crystal Lake,IL,USA
And he left nearly all of it to the Harvard Fire Protection District, 
an organization with which he had little contact. "When we found out, 
it really took ... 
http://www.nwherald.com/articles/2009/05/14/r_5xz3kb5drrw4fvmun99q_a/
index.xml 
 
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Oklahoma scientist's 'accident' may be a real life-saver
NewsOK.com - Oklahoma City,OK,USA
It was then, Albert said, that the 13-year-old noticed the monitor was 
tracking the fire alarm. That accident led to a decade-long effort to 
create a fire ... 
http://newsok.com/scientists-accident-may-be-a-real-life-saver/article/
3368697 
 
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FACILITIES MANAGEMENT NEWS
Fike acquires axonX video technology for flame and smoke detection
May 18, 2009-Fike, a leader in industrial and commercial safety 
solutions, has announced the acquisition of axonX LLC, a developer of 
video image flame and ... 
http://www.fmlink.com/Home/News/news.cgi?catid=114&display=article&id=
25866 
 
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NFPA Journal®, May/June 2009
National Fire Protection Association - Quincy,MA,USA
For the first time in 24 years, NFPA is heading to Chicago for its 
annual conference and exhibit. The Association first met in Chicago in 
June 1898 and went ... 
http://www.nfpa.org/publicJournalDetail.asp?categoryID=&itemID=
43078&src=NFPAJournal&cookie%5Ftest=1 
 
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I apologize for the missed issue.  I was (am) recovering from the flu. 
 
This week I'll see you in Great Falls. 
 
Have fun! 
 
- Mike
 
Twitter http://www.twitter.com/codeweenie 
 
====================================================================== 
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====================================================================== 
ET NEWS JOURNAL                                                        
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STRATIFICATION AND SMOKE DETECTORS 
---------------------------------- 
 
NFPA 72-2007 doesn't have many straightforward statements.  Most are 
open to interpretation.  However, there are a few adamant statements 
such as this one:

5.7.1.10*  The effect of stratification below the ceiling shall be 
taken into account. The guidelines in Annex B shall be permitted to be 
used. 
 
A.5.7.1.10  Stratification of air in a room can hinder air containing 
smoke particles or gaseous combustion products from reaching ceiling-
mounted smoke detectors or fire-gas detectors. 
 
Stratification occurs when air containing smoke particles or gaseous 
combustion products is heated by smoldering or burning material and, 
becoming less dense than the surrounding cooler air, rises until it 
reaches a level at which there is no longer a difference in 
temperature between it and the surrounding air. 
 
Stratification also can occur when evaporative coolers are used, 
because moisture introduced by these devices can condense on smoke, 
causing it to fall toward the floor. Therefore, to ensure rapid 
response, it might be necessary to install smoke detectors on 
sidewalls or at locations below the ceiling. 
 
In installations where detection of smoldering or small fires is 
desired and where the possibility of stratification exists, 
consideration should be given to mounting a portion of the detectors 
below the ceiling. In high-ceiling areas, projected beam-type or air 
sampling-type detectors at different levels also should be considered. 
(See Figure A.5.7.1.10.) 
 
If you're able to stay awake long enough while reading Annex B, you'll 
come across this little nugget: 
 
B.4.6.3.2.2  As an alternative to using the noted expression to 
directly calculate the maximum height to which the smoke or heat will 
rise, Figure B.4.6.3.2.2 can be used to determine Zm (maximum height 
of smoke rise above the fire surface) for given fires. Where Zm, as 
calculated or determined graphically, is greater than the installed 
height of detectors, smoke or heat from a rising fire plume is 
predicted to reach the detectors. Where the compared values of Zm and 
the installed height of detectors are comparable heights, the 
prediction that smoke or heat will reach the detectors might not be a 
reliable expectation. 
 
FIGURE B.4.6.3.2.2  Temperature Change and Maximum Height of Smoke 
Rise for Given Fire Sizes.  This Figure plots stratification as a 
function of fire size and delta T (Temperature Change).  
 
Because stratification is a function of fire size and delta T, Figure 
B.4.6.3.2.2 can be used to predict stratification based upon an 
assumed fire size and delta T.  If one assumes a small fire size of 
100 BTU/Sec and a large delta T value of 100 degrees F, the Figure can 
be used to determine that stratification will occur at 25 feet above 
the finished floor. 
 
This response should not be considered a formal interpretation but 
rather the author's opinion.  
 
-- 
 
Send me your questions and comments: mailto:mike@etnews.org 
 
====================================================================== 
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====================================================================== 
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====================================================================== 
JOB OPPORTUNITIES
====================================================================== 
 
JOB OPPORTUNITY and SEEKING EMPLOYMENT announcements are provided as a 
service.  ET News provides a venue for direct contact between job 
seekers and employers.  ET News is not a placement agency and does not 
endorse either job seekers or employers. 
 
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Post your announcement at http://www.etnews.org/index.php?s=257 
 
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SEMINAR SCHEDULE
====================================================================== 
 
Contact me regarding seminar sponsorship mailto:mikebaker@afaa.org 
  
------------------
May 13-14, 2009 Minneapolis, MN 
------------------
Intermediate Fire Alarm Seminar (NICET I & II) 
Sponsored seminar (closed) 
 
------------------
May 21-22, 2009 Great Falls, MT 
------------------
Intermediate Fire Alarm Seminar (NICET I & II) 
Contact Kyle Jore mailto:kjore@msugf.edu or (406) 771-4338 
 
------------------
May 26-28, 2009 Riverside, CA 
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Fire Alarm Plan Review 
Understanding IBC Fire Alarm Requirements 
Understanding NFPA 101 Fire Alarm Requirements 
http://www.afaa.org/pdf/PR_IBC_101_Riverside_May2009.pdf
 
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June 9-11, 2009 Chicago, IL    
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NFPA World Safety Conference & Exposition 
http://www.nfpa.org/categorylistwsce.asp?categoryID=1600 
 
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June 16-18, 2009 Campbell, CA 
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Fire Alarm System Testing & Inspections Seminar 
Advanced Fire Alarm Seminar (NICET III & IV) 
http://www.afaa.org/pdf/TI_AdvFA_Campbell_June2009.pdf 
 
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June 24, 2009 Buffalo, NY 
------------------
Understanding New York Building Code (IBC) Fire Alarm Requirements 
More info soon ... 
 
====================================================================== 
COMMENTS AND ACKNOWLEDGEMENTS
====================================================================== 
 
ET News is written nearly every week and almost always sent on Sunday. 
 
Doug Hockinson built ETNews.org using PHP/MySQL-> http://www.phpvs.com 
 
Buy codes and standards online-> http://www.etnews.org/index.php?s=461 
 
---------------------------------------------------------------------- 
Some information may be found in this message and etnews.org that is   
reprinted with permission from one or more of the following; NFPA 70   
National Electrical Code(r), NFPA 72(r) National Fire Alarm Code(r),   
NFPA 101(r) Life Safety Code(r), Copyright(c) NFPA, Quincy, MA 02269   
This reprinted material is not the complete and official position of   
the NFPA on the referenced subject, which is represented only by the   
standard in its entirety.                                              
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Some information may be found within this web site that is reprinted with permission from one or more of the following: NFPA 70 National Electrical Code®,NFPA 72® National Fire Alarm Code®, & NFPA 101® Life Safety Code®, Copyright© NFPA, Quincy, MA 02269.

This reprinted material is not the complete and official position of the NFPA on the referenced subject, which is represented only by the standard in its entirety.