*Fire Protection Systems Flashcards
What does the NFPA 72 do or tell us?
sets specific requirements for the installation, location, and maintenance of smoke detection systems.
What are heat detectors better for?
Large spaces or fires with more flames
What do heat detectors do?
pinpoint the location of any temperature change for a specific location or a designated area.
Heat detectors can be paired with smoke detectors to avoid false alarms.
What does NPFA 101 tell us?
specifies requirements for flame-detection alarm systems or radiant energy-sensing systems
What are the different types of flame detectors?
1.) optical detector
2.) UV Detector
3.)Infared Detector
How do optical detectors work?
Optical Detectors use sensors to detect when flames are present.
How do UV detectors work?
UV Detectors can detect radiation within four milliseconds of ignition. Some have a time delay to prevent accidental triggers from lightning.
How do infrared detectors work?
Infrared Detectors use thermal imaging to sense the hot gases produced by a fire, like carbon dioxide. The typical alert time for IR detectors is 3-5 seconds.
How does an ionization detector work?
This detector responds to the ions formed by combustion instead of smoke, flames, or heat.
Because of this, these are not the best detectors for heavy smoke fires.
How does a photoelectric detector work?
This detector aims a light beam into the room or space. When smoke blocks the beam, it sets off an alarm.
These are best for heavy smoke fires.
How does a rise of temperature detectors work?
This detector reacts to an increase in temperature within a space. Because rising temperatures indicate flames, this alarm may be too late to stop a fire.
How does a flame detector work?
This detector senses ultraviolet or infrared light from flames. Like the rise in temperature detectors, flames might be detected too late to stop a fire.
What is the maximum spacing between sprinkler heads?
15’
(they typically ranger 12’-15’)
How far below sprinkler heads do obstructions need to be?
Obstructions to Sprinkler Discharge, which restricts continuous or noncontinuous obstructions less than or equal to 18in below the sprinkler deflector.
What is a standpipe system?
fire protection system that consists of a network of piping, valves and hose connections that provides water supply for extinguishing fires.
