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
March 7, 2014
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Main Drain 10 Percent Reduction
"When performing a main drain test, the static pressure is 100 psi and the
residual
pressure is 85 psi. NFPA 25 says that there cannot be a reduction of 10% or
greater.
Does this apply to the difference between the static and residual pressures?"
Our informal interpretation is that it does not apply to the static and residual
pressures.We have reviewed the 2014 edition of NFPA 25 as the applicable
standard.
The numbers you provided are not unusual results. What Section 13.2.5.3 is
looking
for is a 10 percent reduction in the pressure at residual flow when compared to
the pressure of the residual flow for the main drain test performed at the
acceptance
test. Since the Contractor's Material and Test Certificate is often not
available,
one would then compare against the oldest previous main drain test that is
available.
If the pressure has dropped 10 percent or more, the owner needs to have the
caused
identified and a determination made as to whether corrections are necessary. No
corrections are required if the water supply still exceeds the system demand.
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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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AFSA Webinar
by
Josh Tihen
"Corrosion Inhibition of Dry and Preaction Fire Suppression Systems Using
Nitrogen
Gas"
Wednesday
April 9, 2014
Free to AFSA members!
11:00 a.m. - 12:30 p.m. Central Time
1.5-hours
Register Button
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Training Calendar
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Check our calendar to view upcoming training.
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