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American Fire Sprinkler Association [http://www.firesprinkler.org/]
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AFSA Technical Update
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A newsletter dealing with codes and other technical issues
August 15, 2014
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Pipe Clearance When Penetrating a Structural Member
"Is clearance required on fire sprinkler pipe that penetrates a steel structural
member such as a steel I-Beam? Are flexible groove couplings required to be
located
within 1 ft of each side of the steel structural member?"
We have reviewed NFPA 13, 2010 and 2013 editions that you indicated as the
applicable
standards. Our informal interpretation is that clearance and couplings are not
required
for pipe that penetrates steel structural members.
Section 9.3.4.10 was added as new text in the 2013 edition that specifically
addresses
your issue. It states, "No clearance shall be required where piping is
supported
by holes through structural members as permitted by 9.1.1.6.3." Section
9.1.1.6.3
allows for holes through solid structural members to serve as hangers for the
support
of system piping provided such holes are permitted by applicable building codes
and the spacing and support provisions for hangers of the standard are
satisfied.
This method secures the pipe to the structure and keeps the pipe from moving
differently
from the structure thus satisfying the seismic requirements. As such, the pipe
should contact the beam where clearance requirements of Section 9.3.4.1 through
9.3.4.3 are not applied. This is also supported by Section 9.3.4.9 that says
clearance
from structural members not penetrated or used, collectively or independently,
to
support the piping shall be at least 2 in. Flexible couplings are not required
since the structural members serve as lateral bracing and branch line
restraints.
Flexible couplings provided on each side of the structural member where the
pipe
penetrates is equivalent to providing a flexible coupling before and after each
lateral restraint. Requiring flexible couplings at these penetrations would
defeat
the purpose seismic design.
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firesprinkler.org
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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 2014, American Fire Sprinkler Association.
All Rights Reserved
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PDF Version
PDF Link
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AFSA Webinar
Kenneth W. Wagoner, CFPE, CFPS, SET
to Present on
"Seismic Bracing Layout"
Wednesday
September 10, 2014
11:00a.m. - 12:30 p.m. Central
Free to AFSA members!
Register Button
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Training Calendar
AFSA Beginning
Fire Sprinkler System
Planning School
New Class Added!
Nov. 10 - 21, 2014
Oct. 13 - 24, 2014
SOLD OUT!
Sept. 8 - 19, 2014
SOLD OUT!
July 14 - 25, 2014
SOLD OUT!
Check our calendar to view upcoming training.
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