Bill,
I hate to break the news to you, but nothing in the table is based on
specific fire testing. It was produced in response to pressure from
people saying "if I've only got a little bit of storage, then I
shouldn't need as much protection" (My response is "How do the
sprinklers know how much is being stored?") In the vast majority of
successful storage fire tests, the actual fire area was less than 500
sq.ft., so the difference between 1000 sq.ft. of storage and 100,000
sq.ft. of storage is the probability of the fire starting in storage and
the amount of damage if sprinklers don't work effectively..
I see too many people trying to use NFPA 13 as a fire science resource,
which it absolutely is not. It is a minimum code aimed at life safety.
You can't assume anything about the data (if there is any) behind the
requirements.
Once you go beyond that (like you have with your question) you get into
the realm of fire science. When we had questions like that at FM, we did
a small fire test with the actual commodity, storage arrangement, and
protection in question, and measured the heat flux that resulted. From
that we could calculate whether a given commodity would ignite at a
given distance.
Joe
[EMAIL PROTECTED] wrote:
It seems the adjacent hazard guidance is related to the operation of
sprinklers beyond the storage array. I'm interested in the radiative
heat transfer across an aisle.
Perhaps a question for Joe - is all of the Table 13.2.1 based on fire
test data? How much is committee judgment?
Bill Brooks
William N. Brooks, P.E.
Brooks Fire Protection Engineering Inc.
372 Wilett Drive
Severna Park, MD 21146
410-544-3620 Phone
410-544-3032 FAX
412-400-6528 Cell
-------- Original Message --------
Subject: Re: Aisle Width for Misc Storage
From: Roland Huggins <[EMAIL PROTECTED]>
Date: Mon, March 31, 2008 11:09 am
To: [email protected]
I would start with the criteria on adjacent hazards. Seems that
tells you everything you need to know.
Roland
On Mar 31, 2008, at 7:38 AM, [EMAIL PROTECTED] wrote:
Joe,
Thanks for the insight. My concern is a situation where a client
has a
Chapter 13 (2007) rack storage arrangement and wants to establish a
"safe zone" between the rack storage and adjacent combustibles. The
client wants to be able to say at "X" distance the target will not be
ignited prior to sprinkler control of the rack fire.
Any feel for the value of "X", again assuming Chap 13 stg?
Bill Brooks
William N. Brooks, P.E.
Brooks Fire Protection Engineering Inc.
372 Wilett Drive
Severna Park, MD 21146
410-544-3620 Phone
410-544-3032 FAX
412-400-6528 Cell
-------- Original Message --------
Subject: Re: Aisle Width for Misc Storage
From: Joe Hankins <[EMAIL PROTECTED]>
Date: Mon, March 31, 2008 10:18 am
To: [email protected]
Bill,
It does not mean no aisle jump. In the tests that Class I-IV
protection
are based on, a test was considered successful even if ignition
occurred
across the aisle but was contained (did not burn through to the other
side) of the target rack.
Joe
[EMAIL PROTECTED] wrote:
What is the minimum aisle width in order to use the ceiling only
densities for miscellaneous rack storage (Chap 13 - 2007)? Aisle
widths
are specified in Chapter 16 but not in Chapter 13. Would this
width be
3.5 ft per 3.9.3.7.5?
I'm assuming this would mean there's no ignition across a 3.5 ft
aisle
if Table 13.2.1 is applied.
Bill Brooks
William N. Brooks, P.E.
Brooks Fire Protection Engineering Inc.
372 Wilett Drive
Severna Park, MD 21146
410-544-3620 Phone
410-544-3032 FAX
412-400-6528 Cell
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