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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

December 7, 2012
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Obstruction Investigation

"Is an obstruction investigation required every 5 years or whenever one of the 
14
conditions exist?"

We have reviewed NFPA 25, 2011 edition as the applicable standard. Our informal 
interpretation is that an obstruction investigation is conducted when any of the
 14 conditions in Section 14.3.1 exists.

The internal pipe inspections and obstruction investigations are two separate 
tasks.
The internal inspection of piping has a frequency of every 5 years in Section 
14.2.
The obstruction investigation has no time limit and is initiated when any of the
 listed 14 conditions are present. For example, there were some systems 
installed
for only a few months that have experienced pinhole leaks. This is a condition 
listed
to initiate an obstruction investigation and obstruction prevention program. 
These
14 conditions can show up at any time. A system that does not exhibit any of the
 14 conditions listed under Section 14.3.1, an internal inspection of piping or 
"visual" inspection shall be completed every 5 years by opening a flushing 
connection
at the end of one main and by removing a sprinkler toward the end of one branch 
line. This would include each system if drained for another inspection 
procedure.
The Handbook commentary clarifies that the inspection required by 14.2.1 should 
be coordinated with the internal inspection requirement of system control 
valves,
such as required by 13.4.1.2 for alarm valves. Subsection 14.2.1, is not 
intended
to place an additional burden on the property owner by requiring an additional 
inspection
every five years. If the system is drained for another 5-year inspection, then 
the
internal inspection of that particular system can be completed.
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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 2012, American Fire Sprinkler Association.
All Rights Reserved
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Download the PDF Version of
Technical Update
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Training Calendar
AFSA Beginning
Fire Sprinkler System
Planning School
January 14 - 25, 2013

Check our calendar to view upcoming training.

For details and/or to register, visit the AFSA Calendar 
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Antifreeze TIAs
TIAs on NFPA 13, NFPA 13R, NFPA 13D, and NFPA 25 on antifreeze issues. It is a 
single
document covering all of the TIA's and is located (along with all the other 
information
previously released by NFPA) on the NFPA website at:
http://www.nfpa.org/antifreeze 
[http://www.nfpa.org/itemDetail.asp?categoryID=2064&itemID=48038&cookie_test=1]
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