Chapter 1: Product design
SIGA-REL Technical Reference Manual
5
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
Automatic fire extinguishing systems
Automatic fire extinguishing systems automatically detect and extinguish fires.
They require no manual input because detectors automatically activate releasing
solenoids or sprinkler valves.
Improper application of fire suppression agents can lead to property damage,
injury, or loss of life. Consult the applicable NFPA documents and the AHJ for
more information.
Table 2 provides a list of the fire suppression agents and the applicable NFPA
documents.
Table 2: Fire suppression agents and NFPA standards
Agent
NFPA standard
Low-expansion foam
NFPA 11
Medium- and high-expansion foam
NFPA 11A
Carbon dioxide
NFPA 12
Halon 1301
NFPA 12A
Sprinklers
NFPA 13
Water spray
NFPA 15
Foam-water
NFPA 16
Dry chemicals
NFPA 17
Clean agent
NFPA 2001
