I have an inquiry re" NFPA 25 section 13.4 for "System Valves". The
paragraph for check valves, 13.4.2.2 specifies a 5 year internal
inspection.
Unfortunately NFPA 25 section 3.5 does not include a definition of
"system valve" so this can lead to some interpretation problems.
As per NFPA 14, 6.4.2 a check valve is installed at the Fire department
connections which is tied directly to the main system header. As per
6.4.1 there is no isolation valve. In one example here the fire dept.
connection is tied directly to the main header so there is no means to
access this check valve short of a firewater system shutdown.
What about the small check valves on sprinkler, deluge and foam system
trim? Are these considered "system valves"?
Are Class I and class III standpipe check valves considered "system
valves"?
thanks
Kevin Mowle
Bruce Power
Ontario, Canada
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