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A weekly newsletter dealing with codes and other technical issues
March 23, 2015
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K-factors of In-Rack Sprinklers
"Section 12.6.2 indicates that a K-factor of 8.0 shall be used between densities
of 0.2 to 0.34. Does this apply to in-rack sprinklers or just overhead ceiling
sprinklers? Section 16.2.1.4.4 indicates that in-rack sprinklers shall
discharge
at 15 psi but doesn't specify a K-factor. Please clarify if I can use K-factor
5.6 sprinklers in racks for an overheads ceiling density of 0.24 gpm/sq. ft.?"
Our informal interpretation is that Section 12.6.2 does not apply to in-rack
sprinklers
where 5.6 K-factor sprinklers can be used.
The in-rack sprinklers do not match the ceiling sprinklers for any of the
characteristics
(K-factor, thermal response or discharge). Unfortunately you have to go to
section
8.13.2 to find the rest of the criteria. As you already said, you have to have
a pressure of 15 psi. As section 8.13.2 indicates, you can use a K-5.6 or a
K-8.0.
At 15 psi, these will discharge 21.7 gpm and 31.0 gpm respectively. Both are
equally
acceptable so why have the larger K-factor? Starting in the 2010 edition, the
11.2
K-factor was added. This is for the storage greater than 25 ft that requires a
flow of 30 gpm instead of 15 psi. At this flow, the required pressure is 28.7
psi
for the K-5.6, 14.1 psi for the K-8.0, and 7.2 psi for the K-11.2. Also note
that
even when the ceiling sprinklers are standard response, in-rack sprinklers can
be
quick-response. Although it may sound odd since they are protecting the same
floor
area, the in-rack sprinkler criteria is not impacted in any manner by the
ceiling
sprinkler criteria.
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NFPA 25 Open for Public Comments
The first draft report for the next edition of NFPA 25, Standard for the
Inspection,
Testing, and Maintenance of Water-Based Fire Protection Systems, is open for
public
comments.
http://www.nfpa.org/25 [http://www.nfpa.org/25]
2017 edition:
Posted under Next Edition tab:
First Draft Report - open for public comment
[http://r20.rs6.net/tn.jsp?f=001ePK_coXsLdwcFuYfIvQxuM1EiJsp394uTN3QSHxA2oDXVkCHLWrFvM0IuJjTTIkXhT7Lvv3Kknvj1-Qnabd6pKXjfkehNpiHnFt10zVvfTL0uCGIyRgn4AyLkFLExW-L0dFqEnEi9c3jd9ALh5X4lC6WTdr7smdCpLafa5vptzeOQ1scLqBIPBhnH0V6-wIi5ZdIGWIYyh_1MhMgM4CBjLPCdWMCqiGoJX2UbWtTCVQQgKxOwGFAxqkERAjUWKnHRnXE-86RpgQnsJKyJWQZqrjiZgHCfLwU&c=-oUG3-Y9HXkrLa2VedMgcIG8urKgBdXa2i1tW3bkTAsrrGn5L69j_g==&ch=lp2lvzsaCXoxj7A2MjChDGB6pFo9TksknfJHvcI3CBmYK3UdXpbNuQ==]
First Draft Ballot Final
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NFPA 13 - TIA 1165 Open for Comments
A Tentative Interim Amendment was issued for the 2016 edition of NFPA 13 as Log
No. 1165 addressing Section 17.2.3.5.6 of Chapter 17. The comment closing date
is April 17, 2015.
See the link below or access the TIA or http://www.nfpa.org/13
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PDF Version - Link
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The following is from the TIA document:
Substantiation:
The Fire Protection Research Foundation coordinated additional full scale fire
tests
at 30 ft ceilings for the protection of Exposed Expanded Plastic storage on
racks.
Previous testing by the Foundation demonstrated protocol for 40 ft ceiling
protection
at a higher design pressure. This new 30 ft ceiling information was not
available
to the technical committee during the Annual 2015 cycle of the NFPA 13 document.
The reduction of design pressure from 60 psi (the design pressure for 40 ft
ceilings)
to 30 psi is significant to the cost of the design and installation.
Emergency Nature:
Multiple concerns were raised in the technical committee debate that without 30
ft ceiling data, excessive pressure would be mandated rather than relying on
other
industry standards that had 30 ft ceiling design options. This additional
testing
provides the requested design protocol for 30 ft and lower ceilings in the NFPA
13 document.
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Hosted by the American Fire Sprinkler Association
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Technical Update is prepared by the Technical Services Dept. of the AFSA: Vice
President
of Engineering and Technical Services Roland Huggins, a PE registered in fire
protection
engineering; Phill Brown, a NICET IV certified automatic sprinkler technician
and
NFPA Certified Fire Protection Specialist (CFPS) and Tom Wellen, a PE registered
in fire protection engineering. This is provided with the understanding that
the
AFSA assumes no liability for this opinion or actions taken on it and they are
not
to be considered the official position of the NFPA or its technical committees.
Copyright 2015, American Fire Sprinkler Association. All Rights Reserved
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Webinar
Building Information Modeling: What, How, Why
by
Ray Lambert
and
Kenneth Stowe, PE
Wednesday
March 25, 2015
11:00 a.m. - 12:30 p.m. Central.
This 1.5-hour webinar will be presented FREE to all AFSA members.
Register Button
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This webinar offers 0.15 CEUs and 1.5 CPDs. To receive continuing education
credit
for this webinar you must register for credits for a nominal fee.
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Training Calendar
AFSA Beginning
Fire Sprinkler System
Planning School
More Information
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March 16 - 27, 2015
Sold Out!
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