American Fire Sprinkler Association
12750 Merit Drive, Suite 350 - Dallas, Texas 75251
Ph: (214) 349-5965 Fax: (214 276-0908
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TECH TALK
APRIL 2007
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Hose Allowance for Limited Area Systems
The question arises concerning hose allowances and are they required
for Limited Area Systems? Section 4.2.1 for Limited Area Systems
states, "When partial sprinkler systems are installed, the
requirements of this standard shall be used insofar as they are
applicable." So, even though this design is six sprinklers supplied
by the domestic water supply, the requirements of NFPA 13 still
apply. The heads are required to be calculated through the domestic
water supply. The outside hose stream would be added to the system
at the city connection or a yard hydrant, whichever is closer as
indicated by section 22.9. The outside hose allowance is to be used
for firefighting purposes. However, buildings without fire sprinkler
protection will generally have much greater water demands for the
needed fire flows fire firefighting than the outside hose allowances
indicated in NFPA 13. So why bother with the outside hose allowance?
The most important point of Limited Area Systems is section 4.2.2
that states, "The authority having jurisdiction shall be consulted in
each case." The AHJ will specify whether the outside hose
requirement will be required.
Detection Wire Attached to the Pipe
The support of non-system components is not allowed on sprinkler pipe
and hangers. But what about line heat detectors for preaction or
deluge systems? Section 9.1.1.7 commentary from the 2007 NFPA 13
Handbook indicates that detectors and wiring associated with a
preaction or deluge systems are permitted to be supported by the pipe
and hangers because they are system components. However, detection
systems not associated with the sprinkler system cannot be attached
to the pipe. The Protectowire website, as an example, also posted
the following frequently asked question, "Can Protectowire Linear
Heat Detector be attached to sprinkler pipes? Answer: Mounting
Protectowire Linear Heat Detector directly to sprinkler pipes is
common practice when the detector is the initiating component of an
extinguishing system. In this instance Protectowire Linear Heat
Detector is considered an integral component of the extinguishing
system and typically is allowed by most Authorities Having
Jurisdiction (AHJ). Consult the local Authority Having Jurisdiction
for acceptability prior to installation." When the wires are attached
to the pipe, the manufacturers of the line heat detectors supply or
have approved mounting hardware and accessories. The use of non-
approved mounting hardware and accessories may physically damage the
detector thereby causing "false alarms" and in some cases void the
detector's warranty.
====================
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SEMINARS/CONVENTIONS
OSU Fire Sprinkler Inspection Training & Certificate Program
April 30-May 2,2007
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June 3-7, 2007
Boston, MA
==========================
TechTalk is prepared by the Technical Services Department of the
American Fire Sprinkler Association: Vice President of Engineering
and Technical Services, Roland Huggins, a PE registered in fire
protection engineering; Phill Brown, a CFPS and a NICET IV certified
automatic sprinkler technician, and Tom Wellen, a degreed fire
protection-engineering technologist. Opinions are provided with the
understanding that AFSA assumes no liability for the opinions or
actions taken on them and they are not to be considered the official
interpretation of the NFPA or that of its technical committees.
Copyright (c) 2007, American Fire Sprinkler Association, 9696
Skillman St., Suite 300, Dallas, TX 75243. Voice (214) 349-5965 ext
124 or Fax (214) 343-8898. All rights reserved.
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