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December 28, 2003

                             ET NEWS 
================================================================
        NEWS AND INFORMATION FOR ENGINEERING TECHNICIANS
----------------------------------------------------------------
Issue No. 131          http://www.etnews.org          12-28-2003
================================================================

Contents
--------
- News
- ET Journal
- Job Opportunities
- Fire Alarm Class Schedule
- Comments & Acknowledgements

================================================================
NEWS 
================================================================

SHELTER gets safety system
Billings Gazette, MT
... The 70 to 100 people who typically stay overnight in
Missoula's Poverello Center can rest a little easier these days:
They're now protected by a fire alarm and ...
http://www.billingsgazette.com/index.php?id=1&display=rednews/20
03/12/28/build/state/90-shelter.inc

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CANBERRA cinema evacuated amid fire alert
ABC Online, Australia
... roof. A small fire in a hopper-bin in the loading dock set
off the fire alarm and smoke went into the air conditioning
system. The ...
http://abc.net.au/news/australia/act/200312/s1016722.htm

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INTERSEC 2004 to feature 200 companies and 10 national groups
AME Info, United Arab Emirates
... Exhibits at the show would include fire fighting and fire-
alarm systems, electronic detectors and the most advanced and
sophisticated control systems designed ...
http://www.ameinfo.com/news/Detailed/32788.html

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STOW receives fire grant
Beacon Villager, MA
... So you have to be prepared.". The department will also upgrade
various components of the fire station, particularly the
building's own fire alarm system. ...
http://www.townonline.com/maynard/news/local_regional/bv_newbvfi
regrantpnb12262003.htm

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LIBERTYVILLE Towers evacuated
Pioneer Press Online, IL
... The alarm came in as initially as a residential fire alarm
which indicates the smoke alarm went off in an apartment.
Firefighters ...
http://www.pioneerlocal.com/cgi-bin/ppo-story/localnews/current/
li/12-25-03-189709.html

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UTILITY Says Fire Alarm Delay Worsened California Power Outage
Firehouse.com News
SAN FRANCISCO (AP) -- Failure of utility workers to quickly
respond to a fire alarm at a substation may have worsened a power
outage that left 125,000 city ...
http://cms.firehouse.com/content/article/article.jsp?sectionId=4
6&id=23631

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HOOVER to be charged for pulling alarm
Fitchburg Sentinel, MA
FITCHBURG -- A clerk-magistrate found probable cause to charge
the owner of Halloween Costume World with tampering withan
inoperable fire alarm at City Hall in ...
http://www.sentinelandenterprise.com/Stories/0,1413,106~4994~185
0779,00.html

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ELECTRICAL fire threatens middle school
Barrington Times, RI
WARREN - When the fire alarm went off at 4:30 pm last Friday,
Kickemuit Middle School custodian Jimmy Russo, of Bristol, was
cleaning on the first floor. ...
http://www.eastbayri.com/story/62452786173613.php

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SMOKE alarm alerts owner to fridge fire
Reading Chronicle, UK
... Close, Wokingham, triggered a smoke alarm which was heard by
the resident who was upstairs at the time. She then closed the
kitchen door, called the fire ...
http://icberkshire.icnetwork.co.uk/0100news/0400bracknell/conten
t_objectid=13753441_method=full_siteid=50102_headline=-Smoke-ala
rm-alerts-owner-to-fridge-fire-name_page.html

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NEW Code of Practice on fire detection and alarm systems
Health and Safety-Centre, UK
... The BSI says the leisure industry in particular will benefit
as the Code of Practice primarily relates to the use of EVC
assisting fire-fighters and those ...
http://www.healthandsafety-centre.net/cgi-bin/croner/jsp/Editori
al.do?cache=true&contentId=100674

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I'll see you in Happyrock this week.


Happy holidays!

Mike


================================================================
ET JOURNAL 
================================================================

MODIFYING SMOKE DETECTOR SPACING DUE TO HIGH AIR MOVEMENT
---------------------------------------------------------

NFPA 72-2002
5.7.5.3 High Air Movement Areas.
5.7.5.3.1 General. The purpose and scope of 5.7.5.3 shall be to
provide location and spacing guidance for smoke detectors
intended for early warning of fire in high air movement areas.
Exception: Detectors provided for the control of smoke spread are
covered by the requirements of Section 5.14.
5.7.5.3.2 Location. Smoke detectors shall not be located directly
in the airstream of supply registers.
5.7.5.3.3* Spacing. Smoke detector spacing shall be in accordance
with Table 5.7.5.3.3 and Figure 5.7.5.3.3.
           A.5.7.5.3.3 Smoke detector spacing depends on the
					 movement of air within the room.
5.7.5.3.4 HVAC Mechanical Rooms. Where HVAC mechanical rooms are
used as an air plenum for return air, the spacings of smoke
detectors shall not be required to be reduced based on the number
of air changes.

EXAMPLE
-------
In the following example, determine the de-rated spacing (if any)
for spot-type smoke-sensing fire detectors to be installed in the
room based upon air movement.

The room includes 20 air supply registers, each providing 360
cubic feet per minute. 

+---------------------------------------------+ -
|     +-+     +-+     +-+     +-+     +-+     | ^
|     +-+     +-+     +-+     +-+     +-+     | |
|     each air supply register = 360 CFM      | |
|     +-+     +-+     +-+     +-+     +-+     | |
|     +-+     +-+     +-+     +-+     +-+     | |
|                                             | 40'
|     +-+     +-+     +-+     +-+     +-+     | |
|     +-+     +-+     +-+     +-+     +-+     | |
|                                             | |
|     +-+     +-+     +-+     +-+     +-+     | |
|     +-+     +-+     +-+     +-+     +-+     | |
+---------------------------------------------+ -

|<------------------ 75' -------------------->|

Smooth and flat ceiling height = 12 feet
Air return = air supply


Step 1)
------
NFPA 72-2002 Table 5.7.5.3.3 describes the allowable area of
detection per detector in square feet. NFPA 72 allows us to use
30 feet spacing as a guide:
5.7.3.2.3  On smooth ceilings, spacing for spot-type smoke
detectors shall be in accordance with 5.7.3.2.3(A) through
 5.7.3.2.3(E).
(A)* Spacing of 9.1 m (30 ft) shall be permitted to be used as a
guide. [30 ft X 30 ft = 900 ft^2]
     A.5.7.3.2.3(A)  The 9.1 m (30 ft) spacing is a guide for
		 prescriptive designs, the use of such a spacing is based
		 upon customary practice in the fire alarm community.
Where there are explicit performance objectives for the response
of the smoke detection system, the performance-based design
methods outlined in Annex  B should be used.

If all of the air in the room is changed or turned over less
than 7.5 times per hour (or less than 8 minutes per air change),
then no modification to spacing is required.

To determine whether modification to spacing is required in this
example, we must determine how often all of the air in the room
is changed, expressed as air changes per hour or minutes per air
change.


Step 2)
------
The answer we are seeking will be expressed in air changes per
hour; the air volume of the room in ft^3 per hour.

To arrive at this we must determine the volume of the room in
cubic feet:

Length X Width X Height = Volume
75 ft X 40 ft X 12 ft = 36000 ft^3

Room volume = 36000 ft^3


Step 3)
------
Without air supply (and air return) we wouldn't be required to
modify spacing, and it would get rather stuffy. The drawing shows
that each air supply vent provides 360 cubic feet per minute and
that there are a total of 20 air supply vents. To determine how
much air is supplied to the room, we multiply the air supply per
vent times the total number of vents:

360 ft^3/minute X 20 = 7200 ft^3/minute

Air supply = 7200 ft^3/minute


Step 4)
------
How often is the entire volume of air in the room replaced?

Volume of the room = 36000 ft^3
Air supply rate = 7200 ft^3/minute

36000 ft^3      1 minute
------------- X ---------
1 Room Volume   7200 ft^3
(air change)

Using algebra, the ft^3 units cancel each other out and we're
left with minutes per air change:

5 minutes / air change

or;

1 air change   60 minutes
------------ X ---------- = 12 air changes per hour
5 minutes      1 hour


Step 5)
------
At 5 minutes per air change (or 12 air changes per hour), Table
5.7.5.3.3 requires 625 ft^2 spacing.

To determine spacing in linear feet, we have to find the square
root of 625 ft^2 = 25 ft.

[30 ft spacing -> 30 ft X 30 ft = 900 ft^2;
sqrt of 900 ft^2 = 30 ft]

The modified spacing for this example is 25 ft.


Try this one on your own
------------------------

Determine the de-rated spacing (if any) for spot-type smoke-
sensing fire detectors to be installed in this room based upon
air movement.

+-------------------------------------+ -
|     +-+     +-+     +-+     +-+     | ^
|     +-+     +-+     +-+     +-+     | |
| each air supply register = 200 CFM  | |
|     +-+     +-+     +-+     +-+     | |
|     +-+     +-+     +-+     +-+     | |
|                                     | 20'
|     +-+     +-+     +-+     +-+     | |
|     +-+     +-+     +-+     +-+     | |
|                                     | |
|     +-+     +-+     +-+     +-+     | |
|     +-+     +-+     +-+     +-+     | |
+-------------------------------------+ -

|<--------------- 32' --------------->|

Smooth and flat ceiling height = 10 feet
Air return = air supply

The solution will appear in next week's issue of ET News.

================================================================
JOB OPPORTUNITIES 
================================================================

If you have a job opportunity or are seeking employment, I'll
place your reasonably sized ad here for free. If you're looking
for more exposure, I'll place your ad on the web site 
http://www.etnews.org/index.php?s=257 for a nominal fee.

================================================================
FIRE ALARM CLASS SCHEDULE 
================================================================

------------------
January 13-15, 2004 Houston, TX - Co-sponsored by TFAA
------------------
*NEW* -> Plan Review Seminar <- *NEW* 
*NEW* -> Advanced Fire Alarm Seminar (NICET III/IV) <- *NEW* 
http://www.afaa.org/afaa/PDF/PR_ADV_Houston_Jan2004.pdf

------------------
1/17, 1/31, and 2/14/2004 New York City - Conducted by NY AFAA
------------------
Intermediate Fire Alarm Seminar (NICET I/II)
Contact Mike Jennings at 201-963-4030 for more information. 

------------------
January 20-22, 2004 Albuquerque, NM
------------------
*NEW* -> Plan Review Seminar <- *NEW* 
Intermediate Fire Alarm Seminar (NICET I/II)
http://www.afaa.org/afaa/PDF/PR_IntFA_Albuquerque_Jan2004.pdf

------------------
January 27-29, 2004 Portland, OR - Sponsored by Oregon AFAA
------------------
*NEW* -> Plan Review Seminar <- *NEW* 
*NEW* -> Advanced Fire Alarm Seminar (NICET III/IV) <- *NEW* 
http://www.afaa.org/afaa/PDF/PR_ADV_Portland_Jan2004.pdf

------------------
January 29-30, 2004 Seattle, WA - Conducted by Dean Reed
------------------
NICET I & II Fire Alarm Test Preparation Seminar
http://www.etnews.org/pdf/NICET_I&II_DeanReed_JAN04.pdf

------------------
February 10-12, 2004 Dallas, TX - Co-sponsored by TFAA
------------------
*NEW* -> Plan Review Seminar <- *NEW* 
Intermediate Fire Alarm Seminar (NICET I/II) 
http://www.afaa.org/afaa/PDF/PR_IntFA_Dallas_Feb2004.pdf

------------------
February 24-26, 2004 St. Louis, MO
------------------
*NEW* -> Plan Review Seminar <- *NEW* 
Intermediate Fire Alarm Seminar (NICET I/II) 
http://www.afaa.org/afaa/PDF/PR_IntFA_StLouis_Jan2004.pdf

------------------
March 10-11, 2004 Wichita, KS - Sponsored by KS AFAA
------------------
*NEW* -> Plan Review Seminar <- *NEW* 
Inspection, Testing, and Maintenance of Fire Alarm Systems
More information is forthcoming.

------------------
April 6, 2004 Chicago, IL
------------------
*NEW* -> Plan Review Seminar <- *NEW* 
Intermediate Fire Alarm Seminar (NICET I/II)
More information is forthcoming.

================================================================
COMMENTS AND ACKNOWLEDGEMENTS 
================================================================

Engineering Technician info http://www.bls.gov/oco/ocos112.htm

ET News is published weekly and if possible, delivered on Sunday

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The NICET acronym found herein refers to http://www.nicet.org 
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The AFAA acronym found herein refers to http://www.afaa.org 
AUTOMATIC FIRE ALARM ASSOCIATION "celebrating 50 years!"
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reprinted with permission from one or more of the following;
NFPA 70 National Electrical Code(r), NFPA 72 National Fire Alarm
Code(r), and 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.