Fire Detection Alarm And Suppression Flashcards
The most basic alarm system is initiated how?
Manually
What is the most reliable type of suppression system?
Automatic sprinklers
A pull handle alarm system is referred to as what?
Local warning system
Fixed temp heat detectors
Are the least prone for false activations
Are activated when they are heated to a set temp
How many devices for fixed temp
3
Fusible link
Frangible bulb
Continuous line
Fusible device
Held by solder and melts when heated
Frangible bulb
Liquid in glass bulb breaks when a rates temp is reached
Continuous line device
Detects heat over a linear area parallel to the detector
Bimetallic detector
Two metals with different thermal expansion rates that strip an alarm when heated
Rate of rise detector
Temp exceeds 12 to 15 degrees in one min sounds alarm
Pneumatic rate of rise spot detector
“ “ rate of rise line
Is most common type
Hike allows air to enter and exit which reads normal atmospheric temps
Line covers more area
Rate compensated detector
Signals when regular temp changes slower than those under fire conditions
Thermoelectric detector
Two wires of dissimilar metals twist together and creat an electrical current
Smoke detectors
Non residential or large multiple family
Barracks /hotels
Detect smoke but send a signal to another device to sound alarm
Smoke alarms
Family homes
Detect smoke and sound alarm
Photoelectric smoke detectors use how many ways to detect smoke?
2
Beam application
Refractory spoil application
Beam application
Uses a beam of light to a censor when the light is blocked by smoke the alarm sounds
Refractory photocell
Light beam reflects off smoke hitting a censor sounding alarm
Photoelectric smoke Alarms are more sensitive when the fire is…..
Smoldering
Ionization detectors
respond when the flame is present and uses the irons released from the flame to alarm
What are the two main ways to power these desires?
Batteries and household currents
What are the two types of flame detectors?
Ultraviolet
Infrared
Are the most sensitive devices
Gas detectors
Alarm when a set gas is released into the atmosphere
Combination detectors
Multiple devices combined
How many auxiliary systems are there?
3
Local energy system
Shunt
Parallel telephone
Local energy
Attached directly to a hard wired alarm system or master box
Shunt
Circuit runs into the alarm system for protected property
Parallel telephone
One telephone circuit just for Alarms
Remote Station system
Connects to the fire department telecommunications center directly
Remote station system
Transmits a code of distress
Proprietary systems
Large commercial and industrial transferred to a center where the alarm is reported
Central station
Revives the alarms
Two types of sprinkler coverage
Complete sprinkler system
Partial sprinkler system
What are the NFPA
For installations of sprinklers
13- standard
Complete sprinkler coverage
13D- family homes
13R- multiple story buildings
Nationally recognized testing for automatic sprinkles
Underwriters laboratories inc
FM global
Primary duty for sprinkler systems
Safety of building occupants
The riser
the vertical piping to which the sprinkler valve main drain and other components are attracted
The feed main
Pipe connecting the riser to the cross mains
Cross main
Directly service branch lines and sprinklers
Sprinklers
Discharge water
How many ways activate sprinklers
3 fusible links
Frangible bulbs
Chemical pellets
Sprinklers are installed in 3 basic positions?
Pendent
Upright
Side wall
Control valve
Is usually located immediately under the sprinkler alarm valve
Indicating control valve
One that shows glance through glass if it’s open or shut position
Outside stem and yoke
Yoke in the outside with a threaded stem that opens and closes the gate inside the housing valve
Post indicator valve
Is a hollow metal post that houses the valve open or shut
Wall post indicator
Valve operating but on the outside of the building
Post indicator
Circular disk to represent open or closed
Actuation of fire alarms by sprinklers are when
Triggered by water flowing through the system
In most cases the water supply for a sprinkler system is designed to supply only
A portion of the system
Fire department connection
FDC
Minimum two two and half hose connections with a minimum of 1,000 gpm
What are the types of sprinkler systems?
Wet pipe Dry pipe Precaution Deluge Residential
Wet pipe
Simplest form straight stick system where systems don’t get below 40F
Dry pipe
Below 40 F keeps water out of piping used by small amounts of air pressure
Deluge system
Dry pipe have no fusible links sprinklers are open all the time
Whole system will activate at once
Residential
Typical home system
Photoelectric smoke detectors
Beam application
Refractory photocell
Photoelectric smoke alarms
Are sensible to smoldering fires
Flame detectors
Are most sencitive
