Fire Suppression Systems & Technology Flashcards

What is the minimum water supply duration required for a hydraulically designed wet-pipe sprinkler system in an Ordinary Hazard Group 2 occupancy per NFPA 13?

Answer: 60 minutes

NFPA 13 requires a 60-minute water supply duration for Ordinary Hazard Group 2 occupancies with hydraulically designed systems.

In a pre-action sprinkler system, what combination of events must occur before water discharges through an open sprinkler head?

Answer: Detector activates and pre-action valve opens

In a standard pre-action system, a detection device activates the pre-action valve to fill the piping with water, then the sprinkler fuses to discharge.

Which NFPA standard governs the installation of foam-water sprinkler systems?

Answer: NFPA 16

NFPA 16 is the Standard for the Installation of Foam-Water Sprinkler and Foam-Water Spray Systems.

A deluge system differs from a pre-action system primarily because a deluge system:

Answer: Has all sprinkler heads open and discharges immediately on valve opening

Deluge systems use open (unloaded) sprinkler heads so water discharges simultaneously from all heads when the deluge valve opens.

For a clean agent fire suppression system using FK-5-1-12 (Novec 1230), what is the primary mechanism by which it suppresses fire?

Answer: Physical cooling and some chemical inhibition

FK-5-1-12 suppresses fire primarily through physical heat absorption (cooling) with a minor chemical inhibition contribution.

According to NFPA 13, what is the maximum area of sprinkler operation (design area) typically used for Extra Hazard Group 2 occupancies?

Answer: 2,500 sq ft

NFPA 13 specifies a 2,500 sq ft design area for Extra Hazard Group 2 occupancies under the density/area method.

What is the minimum Hazen-Williams C-factor used for hydraulic calculations of new Schedule 40 steel sprinkler piping per NFPA 13?

Answer: 140

NFPA 13 specifies a Hazen-Williams C-factor of 140 for new steel pipe in hydraulic calculations for sprinkler systems.