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Fire suppression systems
Table 1-1: FM approval requirements for deluge and preaction sprinkler systems
Specification
Standby operation
Alarm operation
NFPA style
XLS-REL Technical Reference Manual
Sprinkler systems
The XLS-REL works with two types of sprinkler systems: deluge
and preaction. The primary difference between both systems is
the type of sprinkler head (or nozzle) that terminates the pipes.
Table 1-1 outlines the Factory Mutual Research Corporation
(FMRC) requirements for deluge and preaction systems. FMRC
also requires FM-approved compatible release valves. See
Table 1-4 in Compatible panels and devices.
Value
90 hours
10 minutes
Class A (Style D or E) or Class A (Style 2, 5, 6, or 7)
Deluge sprinkler systems
In Deluge sprinkler systems, open-valve sprinkler heads
terminate pipes connected to a water supply controlled by a single
valve. When the system detects a fire it automatically opens the
valve to allow the waterflow through all of the sprinkler heads.
Deluge sprinklers are useful for applications that require the
simultaneous discharge of water through every sprinkler.
The following fire detection systems meet FRMC requirements
for deluge systems:
•
Wet pilot sprinkler line
•
Dry pilot sprinkler line
•
Hydraulic rate-of-rise
•
Pneumatic rate-of-rise
•
Electric
Preaction sprinkler systems
In preaction sprinkler systems, closed-valve sprinkler heads
terminate pipes connected directly to a water supply. The water
supply is usually in the same area as the sprinklers and the pipes
are supervised for air pressure. Preaction sprinklers are useful
where it is important to prevent the accidental discharge of water.
The following fire detection systems meet FRMC requirements
for preaction systems:
•
Hydraulic rate-of-rise
•
Pneumatic rate-of-rise
•
Electric
Installing the XLS-REL
1.3
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