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October 21, 2001

                   Northwest NICET Newsletter 
================================================================
Volume 1 Issue 17                                     10-21-2001
================================================================

        News for Fire Protection Engineering Technicians
        ------------------------------------------------

Contents:
---------
- News
- Tech Stuff
- Test Dates
- Class Schedule
- Administrivia

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

I recently received the following email from Russ Freier, president of
ASCET:

"There will be an OREGON CHAPTER ASCET meeting Thursday November 1st,
2001 at HEIDI'S Restaurant located at 1230 NE Cleveland St in Gresham,
Oregon.  (Pony Soldier Inn Sign At Burnside) Heidi's is on the same
block as the Pony Soldier Inn.  
 
The Mt Hood CC Student Chapter ASCET is cordially invited (as is Sandy
March, Student advisor LBCC)

Russell Freier National President of ASCET is planning to attend as
well.

We will be discussing chapter benefits, organization.
 
Please RSVP if possible - Heidi's is always flexible just in case
John Vaaler, President Oregon Chapter ASCET"

I will be traveling on 11/1 and unable to attend. If you are interested
in attending please contact John Vaaler --> mailto:John_Vaaler@pgn.com

----------------------------------------------------------------

Don't forget to attend the first general membership meeting of the
Oregon Automatic Fire Alarm Association to be held at 9am next Tuesday
10/23 at:

EC Company
2121 NW Thurman
Portland, OR

Free coffee and donuts courtesy of EC Company.

More info will be forthcoming at http://www.oafaa.org

================================================================
TECH STUFF
================================================================

Detector Spacing
----------------

This is the solution to project #2 for those of you attending the
seminars at Clackamas Community College in September

Layout a system of heat detectors in this example of a warehouse, to be
used for sprinkler system pre-action.


|<--------------- 300' ---------------->|
+---+---+---+---+---+---+---+---+---+---+ -
|   |   |   |   |   |   |   |   |   |   | ^
|   |   |   |   |   |   |   |   |   |   | |
|   |   |   |   |   |   |   |   |   |   | |
|   |   |   |   |   |   |   |   |   |   | |
|   |   |   |   |   |   |   |   |   |   | 100'
|   |   |   |   |   |   |   |   |   |   | |
|   |   |   |   |   |   |   |   |   |   | |
|   |   |   |   |   |   |   |   |   |   | |
|   |   |   |   |   |   |   |   |   |   | v
+---+---+---+---+---+---+---+---+---+---+ -

  ^   ^   ^   ^   ^   ^   ^   ^   ^   ^
  |   |   |   |   |   |   |   |   |   | 
24" deep beams forming (10) 30' wide bays


Level ceiling height = 28 feet
Ceiling surface = 24" deep beams
Manufacturer's heat detector listed spacing = 50'
Maximum ceiling temperature = 115 degrees F

Step 1)
-------
When designing a fire detection system, consideration should be given to
ceiling height, ceiling surface, slope of ceiling, and system purpose.

In this example, relevant code does not require a heat detection system,
however, the property owner wants to use a heat detection system as
sprinkler system pre-action.


Step 2)
-------
The manufacturer's listed spacing (S) for each detector is 50'.

This spacing may be required to be modified by ceiling height, surface,
and slope:

S = 50'


Step 3)
-------
NFPA 72-1999 Table 2-2.4.5.1 requires that we modify spacing of heat
detectors to 40% of listed spacing due to ceiling height:

S = 50' X .4 = 20'


Step 4)
-------
NFPA 72-1999 2-2.4.3 requires, among other things, that for ceilings
with beams that project more than 18" below the ceiling and that are
more than 8' on center, each bay formed by the beams will be treated as
a separate area.

The example illustrates (crudely) 24" deep beams spaced 30' on center,
therefore each of the bays formed by the beams will be treated as a
separate area.


Step 5)
-------
NFPA 72-1999 2-2.4.1.1 is the 'either-or' article;

either install detectors within a distance of one-half listed (and
modified) spacing measured at right angles from all walls or;

all points on the ceiling will have a detector within a distance of .7
times listed (and modified) spacing.


Step 6)
-------
NFPA 72-1999 2-2.3 The temperature rating of the heat detector will be
at least 20 degrees F above the maximum expected ceiling temperature.

The example data will require at least a 135 degree F heat detector.


Step 7)
-------
Layout the detectors using the modified spacing of 20'.

NOTES
-----
Rx = Row number 1 - 9
Cx = Column number 1 - 10 
(For example: R1C1 = The heat detector located at the point
corresponding with the point of intersection between Row 1 (R1) and
Column 1 (C1))

     |<--------------- 300' ---------------->|
     +---+---+---+---+---+---+---+---+---+---+ -
R1-> | H |   |   |   |   |   |   |   |   |   | ^
R2-> | H |   |   |   |   |   |   |   |   |   | |
R3-> | H |   |   |   |   |   |   |   |   |   | |
R4-> | H |   |   |   |   |   |   |   |   |   | |
R5-> | H |   |   |   |   |   |   |   |   |   | 100'
R6-> | H |   |   |   |   |   |   |   |   |   | |
R7-> | H |   |   |   |   |   |   |   |   |   | |
R8-> | H |   |   |   |   |   |   |   |   |   | |
R9-> | H | H | H | H | H | H | H | H | H | H | v
     +---+---+---+---+---+---+---+---+---+---+ -
      C1  C2  C3  C4  C5  C6  C7  C8  C9  C10

Because this is a regularly shaped rectangle, we can find the total
number of heat detectors required by first determining the perimeter
spacing then multiplying the number of detectors in C1 by the number of
detectors in R9.

The number of detectors in C1:
Using one-half listed spacing from the perimeter walls;

.5 X 20' = 10'
100' - 10'(R1C1) = 90'
90' - 10'(R9C1) = 80'
80' / 20' = 4

4 detectors plus the two outside detectors (R1C1 & R9C1) = 6

Each column, C1 through C10, will require 6 detectors to meet the
requirement that we treat the bays formed by the beams as separate
areas. 

10 bays X 6 detectors per bay = 60 detectors

----------------------------------------------------------------

extra credit:
-------------
How do we modify heat detector spacing for ceiling heights that exceed
30'?

NFPA 72-1999 2-2.4.5.2 The minimum spacing of heat detectors shall not
be required to be less than 0.4 times the height of the ceiling.


================================================================
TEST DATES 
================================================================

Oregon
------
PCC Sylvania, Portland;
Test 11/19/01. Postmark deadline 9/29/01.
Test TBA/02. Postmark deadline 12/1/01.

Clackamas Community College, Oregon City;
Test 11/19/01. Postmark deadline 9/29/01.
Test 1/26/02. Postmark deadline 12/1/01.

Washington
----------
Bates Technical College, Tacoma;
Test 11/19/01. Postmark deadline 9/29/01.
Test TBA/02. Postmark deadline 12/1/01.

Walla Walla Community College;
Test 12/14/01. Postmark deadline 10/27/01.
Test TBA/02. Postmark deadline 12/1/01.

Spokane Community College;
Test 10/20/01. Postmark deadline 9/1/01.
Test TBA/02. Postmark deadline 12/1/01.

Idaho
-----
Boise State University;
Test 11/17/01. Postmark deadline 9/29/01.
Test TBA/02. Postmark deadline 12/1/01.

Ricks College, Rexburg;
Test 12/15/01. Postmark deadline 10/27/01.
Test TBA/02. Postmark deadline 12/1/01.

Montana
-------
Rocky Mountain College, Billings;
Test 10/20/01. Postmark deadline 9/1/01.
Test TBA/02. Postmark deadline 12/1/01.

Montana Tech, University of Montana, Butte;
Test 11/16/01. Postmark deadline 9/29/01.
Test TBA/02. Postmark deadline 12/1/01.

MT State University, Bozeman;
Test 12/15/01. Postmark deadline 10/27/01.
Test TBA/02. Postmark deadline 12/1/01.

Flathead Valley Community College, Kalispell;
Test 11/17/01. Postmark deadline 9/29/01.
Test TBA/02. Postmark deadline 12/1/01.

For a complete list of all test centers and test dates, point your
favorite http client to -->http://www.nicet.org/tests.shtml

================================================================
CLASS SCHEDULE 
================================================================

Clackamas Community College is sponsoring a 16-hour Saturday
Seminar(r)in November:

--> 11-10-2001 8am - 5pm NICET Certification application process and
Fire Alarm Systems Level I Element Review.

--> 11-17-2001 8am - 5pm Fire Alarm Systems Level II Element Review.

Visit http://www.lerc.org to register.

================================================================
ADMINISTRIVIA 
================================================================

I recently replaced the hard drive and keyboard in my laptop, which put
it out of commission for about a week. If I owe you an email response,
please remind me as some of my programs are mucked up after
reinstallation. 

Send your contributions, suggestions, comments, and questions to -->
mailto:TheBakerGroup@home.com

To unsubscribe, click the reply button and type 'unsubscribe' in the
subject line.

Have fun!

Mike  http://www.BakerElectric.org

================================================================
NW NICET Newsletter Copyright (c) 2001 Michael B. Baker
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