Inspector Chapter 12 Flashcards
(123 cards)
_____ _____ _____ are used as the first line defense against fire.
Automatic Sprinkler Systems
Fire loss data reveals that in buildings equipped with automatic sprinklers, about _____ of all fires were controlled or extinguished by the sprinkler system.
94%
The Fire death rate per thousand in sprinkler-equipped hotels and motels is ___.
1.6
The Fire death rate per thousand in non-sprinklered hotels and motels is ___.
9.1
Most fires in sprinkler-equipped structures are controlled by the operation of how many sprinkler heads?
1-2
Consists of open sprinklers attached to unpressurized dry pipes that activates when a detection device in the protected area senses a fire and opens the waterflow control valve.
Deluge Sprinkler System
Continually charged with air that may or may not be under pressure. System operates when a sprinkler opens due to a thermally sensitive device activating and one or more detection devices in the same area triggers the water flow control valve to open.
Preaction Sprinkler System
Wet-pipe system that is continually charged with an antifreeze solution.
Antifreeze Sprinkler System
Wet-pipe system that uses the sprinkler system to circulate water for non-fire-protection building services such as heating or cooling. Closed System.
Circulating closed-loop Sprinkler System
System used in special circumstances where an additional level of protection against false activation is required.
Combined dry pipe and preaction sprinkler system.
System designed to be operated repeatedly in response to a detection device. System shuts on and off based on the demand indicated by the detection device.
Multicycle Sprinkler System
_____ _____ consist of parallel cross mains connected by multiple branch lines.
Gridded Systems
_____ _____ consist of interconnected cross mains that provide multiple routes for water to reach any point in the system.
Looped Systems
_____ _____ is a common design because of the advantage of water flow from multiple directions.
Looped Systems
Every automatic sprinkler system is equipped with a _____ _____ _____ _____ on either side of a check valve (backflow preventer) that prevent sprinkler water from flowing back into the water supply.
Main Waterflow Control Valve
Gate valve that has a yoke on the outside with a threaded stem or screw
Outside Stem and Yoke
Underground gate valve that has a hollow metal post attached to the valve housing. The valve stem inside the post has a target on which the words OPEN or SHUT appear.
Post Indicator Valve
Similar to a PIV except that it extend horizontally through the wall with the target and valve operating nut on the outside of the building.
Wall Post Indicator Valve
Similar to the PIV except that it uses a butterfly valve, while the PIV uses a gate valve.
Post Indicator Valve Assembly
Operating Valves: Located on the riser and used to flow water for testing the waterflow alarm; performs a function similar to the inspector’s test valve that may be located at a remote part of the system piping.
Alarm-Test Valve
Operating Valves: Used to limit the flow of water to one direction; placed in the water supply line to prevent recirculation or backflow of water from the sprinkler system into the municipal water supply system.
Check Valves
Used to drain water from piping when pressure is relieved in the pipe; may be main drain or auxiliary valves.
Drain Valves
May be globe, ball, or gate valves; used primary as drains and test valves. With many packaged valves in use, ball valves are common. The inspector’s test valve is used a globe valve and may sometimes be found at a remote location within a sprinkler system.
Trim Valves
Used for drains and to keep water from freezing in the pipes and damaging them.
Drip check or Drip ball valves
