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
July 3, 2014
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Clearance Hole for Pipe Penetrating a Floor
"We have a flexible coupling within two feet of the asphalt on the riser. Is
clearance
required around the riser pipe when there is asphalt paving?"
We have reviewed NFPA 13, 2013 edition as the applicable standard. Our informal
interpretation is that clearance would be required around the pipe penetrating
the
floor or the asphalt surface.
The purpose of the clearance is to prevent breakage of the fire sprinkler pipe
during
a seismic event. The holes for the clearance should be nominally 2 in. larger
than
the pipe for 1 in. through 3 ½ in. and 4 in. larger for pipe sizes 4 in. and
larger
according to Section 9.3.4.2. The clearance around the pipe does not have to be
annular or in other words, the pipe does not need to be located in the exact
center
of the opening. An exception to providing clearance is the use of flexible
couplings
within 1 foot on both sides of the opening. The problem is that since the
piping
is located underground, it would not be feasible to install a flexible coupling
under the floor or asphalt surface. Thus the clearance should be provided for
underground
piping penetrating the floor or asphalt surface. Note that the piping is not
limited
to sprinkler risers and can include drains, fire department connections, and
other
auxiliary piping. A thin layer of asphalt could be considered frangible per
Section
9.3.4.4 where it would be unlikely to damage the riser pipe during a seismic
event.
Greater thicknesses of asphalt can cause damage to the riser pipe. The
thickness
where asphalt would damage the riser pipe is not defined. Thus this should be
discussed
with the AHJ if applying Section 9.3.4.4.
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NFPA 25 Accepting Public Inputs
The Public Input deadline for NFPA 25, 2014 edition, Standard for the
Inspection,
Testing, and Maintenance of Water-based Fire Protection Systems is set for July
7, 2014.
First Draft (previously Report on Proposals (ROP))
Submit your inputs online
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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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Fire Sprinkler System
Planning School
Register for
Oct. 13 - 24, 2014
Sept. 8 - 19, 2014
SOLD OUT!
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SOLD OUT!
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