Fire Protection system Flashcards
Briefly describe the components of a thermal switch fire detection system?
Temperature sensitive switches that complete a circuit at specific temperature and trigger a warning
Are thermal switches wired in series or in parallel with each other?
Parallel
How are the detector units in a double-loop fenwal system wired?
In parallel between two complete loops of wiring
In what way in thermocouple wire warning system different from a thermal switch system?
Thermocouple systems are sensitive to the rate of temperature change, whereas thermal switch system respond to a specific temperature value
briefly describe the components of a kidde continuous loop fire detection system?
a kidde system has Inconel loop whose resistance changes with temperature
Briefly describe the components and operation of a Lindberg fire detection system
A stainless steel tube contains an inert gas and a discrete material that absorbs some of the gas. when the tube heats up, some gas is released, raising the pressure in the tube, which activates a pressure switch
Describe the process or mechanism by which a photoelectric smoke detector generates a warning of a possible fire
Smoke particles refract light in the detector unit causing the photoelectric cell to conduct electricity and trigger the alarm
how can the operation of a photoelectric smoke detector be tested?
by actuating a test switch
Name two type of smoke detection systems used in aircraft?
Light refraction (photoelectric) and ionization type
what are the usual locations where a carbon monoxide detector would be installed?
In an aircraft cockpit or cabin
how does a carbon monoxide detector indicate the presence of this deadly gas?
The tan spot on the detector turns gray or black
What are the possible effects of kinks and sharp bends in the sensing element of a fire warning system?
False fire warnings caused by short circuits
How is a Freon container checked for proper pressure?
A chart must be used to determine the maximum and minimum gauge pressure readings based on the ambient temperature
Name the two basic types of fire extinguishing systems?
The conventional system and the high rate discharge system
Name the extinguishing agent most commonly used by conventional fire extinguishing systems?
Carbon dioxide CO2
Name the extinguishing agent most commonly used by high rate discharge fire extinguishing systems?
Halon (Halongenated hydrocarbon type agent) also as known Freon
How are Freon bottle protected from excessively high temperatures and how can you tell that this has occurred?
A thermal fuse (or blowout disk) will release the agent if the bottle temperatures exceeds a certain limit. This blows out a red indicator disk
What condition is indicated if the yellow disk is missing in a fire extinguishing system?
The system has been discharged normally
Describe mechanism by which a Freon bottle is discharged?
An electrical signal fires an explosive squib, which ruptures a frangible disk
How is the service life of a discharge cartridge calculated?
From the date stamped on the cartridge by the manufactures
