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25 Cards in this Set
- Front
- Back
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which turret typically delivers the agent at a flow rate that ranges from 500 to 1500 gallons per minute?
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roof
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which turrent typically delivers agent at a flow rate of 250 gpm?
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bumper
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an average handline is expected to operate at or around how many gpm?
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100 gpm
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what is most of the initial on-board supply of water on an ARFF apparatus used for?
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to produce enough foam to create the initial rescue pathway
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what are the two types of water sources that can be used for replenishing your ARFF?
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1)static water sources
2)pressurized water sources |
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of the two types of water sources used to replenish the ARFF apparatus which is more commonly used?
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pressurized water source
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what are the two types of foam proportioning found on the ARFF?
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1)low-energy systems
2)high-energy systems |
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of the two types of ARFF foam proportioning ystems which is more commonly found on structural and wildland fire apparatuses?
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high-energy systems
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in low-energy proportioning systems when is the air introduced to the foam/water solution?
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at the nozzle or immediately after the solution is discharged from the nozzle
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in high-energy foam proportioning systems when is air introduced to the foam/water solution?
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before it is expelled from the nozzle
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what type of high-energy system maybe used in ARFF applications?
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CAFS
compressed air foam system |
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what are the types of foam proportioning methods for low-energy proportioning systems?
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1)variable-flow, variable-rate direct-injection
2)balanced-pressure 3)installed in-line eductor 4)around-the-pump proportioner 5)batch mixing |
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how is batch mixing low-energy proportioning accomplished?
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foam concentrate is poured directly into the water tank
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what types of foam concentrates can you perform batch mixing with?
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1)AFFF
2)CLASS A foam concentrates |
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what are some disadvantages to the batch mixing method?
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1)the entire on-board water supply must be discharged as foam
2)the water tank can not be continuously refilled 3)the water tank must be empty before a new "batch" of solution can be made |
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in a installed in-line eductor low-energy system where is the eductor attached?
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directly to the pump discharge or on a handline
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when using a around-the-pump proportioner how is the foam concentrate drafted into the water stream?
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an eductor
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what are the two types of balanced-pressure systems used in ARFF operations?
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1)bypass-type balanced-pressure systems
2)demand-type balanced-pressure system |
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when using the balanced-pressure foam proportioning system how is foam concentrate introduced into the water stream?
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by a foam concentrate pump
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how is foam pressure controlled in demand-type balanced-pressure foam proportioning systems?
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by a hydraulic pump
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when using a bypass-type balanced-pressure foam proportioning system how is foam pressure controlled?
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by a diaphragm valve that routes excess foam concentrate back to the tank
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what are some advantages to the balanced-pressure foam proportioning system?
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1)there is no water intake pressure limitation
2)water and foam can simultaneously be discharged from separate outlets 3)various percentages of foam solution can be discharged from multiple discharge outlets |
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what is the purpose of a multimetering valve control?
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controls how much foam concentrate is released into the system depending on the outlets that are in use
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what type of foam proportioning system utilizes a multimetering valve?
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installed in-line eductor system
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what two foam proportioning systems or methods include both a water pump and a foam pump allowing water and foam to be discharged simultaneously from different outlets on the ARFF apparatus?
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1)balanced-pressure
2)variable-flow, variable-rate direct-injection |
