Chapter 1 Product design
4 SIGA-REL Technical Reference Manual
Features
The SIGA-REL includes an intelligent microprocessor that supports:
• Deluge sprinkler operation
• Preaction sprinkler operation
• Automatic fire extinguishing operation
• Selectable abort modes
Fire suppression systems
Sprinkler systems
The SIGA-REL works with two types of sprinkler systems: deluge and preaction.
The primary difference between these systems is the type of sprinkler head (or
nozzle) that terminates the pipes. Table 1 outlines the Factory Mutual Research
Corporation (FM) requirements for deluge and preaction systems. FM also
requires FM Approved compatible release valves. See Table 4 in the topic
“Compatible panels and devices.”
Table 1: FM requirements for deluge and preaction systems
Class A (Style D or E)
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 water to flow 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
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