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Week 6 > Foam, Spray, Mist > Flashcards

Foam, Spray, Mist Flashcards

(72 cards)

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1
Q

What three elements are required to create foam?

A

Water, foam concentrate, air

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2
Q

What ensures continuous introduction of foam concentrate into the water stream at the required ratio?

A

Proportioners

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3
Q

What are the expansion rates for medium expansion foam?

A

20:1 to 200:1

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4
Q

What is the best practice for filling foam bladder tanks?

A

Always fill with low pressure high volume pump

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5
Q

What are the contents of early protein based foams?

A

Chicken Beaks and feathers

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6
Q

What type of fire is best protected by low expansion foam?

A

2 dimensional

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7
Q

How much foam is created with 500 gallons of water mixed with 3% foam concentrate at a 200:1 expansion rate?

A

103,000 gal

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8
Q

What types of fires is foam preferred for?

A

Class A and B

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9
Q

AFFF can be discharged through?

A

Air-aspirating, non-air-aspirating, and standard sprinkler

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10
Q

What is the purpose of the annual foam test?

A

Check for proper concentration

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11
Q

How many gallons of 3% concentrate does a 500 gpm foam nozzle consume per minute?

A

15 gallons

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12
Q

What type of fuel can regular AFFF not be used on?

A

Polar solvent

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13
Q

What type of foam concentrate is used in deluge systems using a foam generator?

A

Synthetic detergent

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14
Q

What is the name of the sacrificial membrane associated with ARC foam concentrates?

A

Polymeric membrane

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15
Q

What is the minimum discharge time of foam solution?

A

10 min

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16
Q

What is the maximum spacing of sprinklers on foam water sprinkler systems?

A

12’

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17
Q

What is the minimum discharge time of a foam system with a .20 density using closed sprinklers?

A

8 min

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18
Q

What is an acceptable range for proportioning systems?

A

No acceptable range

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19
Q

Which NFPA is used for the installation of ultra-high-speed water spray systems?

A

NFPA 15

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20
Q

What is an exposure fire?

A

A fire that started outside the protected area

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21
Q

What is the minimum pressure rating of system components on a water spray system?

A

175 PSI

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22
Q

What is the minimum steel pipe size that may be used in a water spray system?

A

1”

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23
Q

Hangers for water spray systems must be installed according to what NFPA standard?

A

NFPA 15

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24
Q

What is the requirement of a water spray system?

A

Control of runoff

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25
What is a design objective of water spray systems?
Exposure protection
26
What is the minimum discharge pressure for an ultra high-speed water spray system nozzle?
50 psi
27
What is the maximum response time of a water spray system?
100 milliseconds
28
What is the hydraulic test pressure of a water spray system with a normal operating pressure of 155 psi?
205 psi
29
Which NFPA is the standard for the installation of water mist systems?
NFPA 750
30
What is the average size of a water droplet in a water mist system?
100 microns
31
Identify the hazard which can be protected by water mist systems?
Class A and diesel engines
32
If using a water mist system to protect against a class B fire, the water droplet must be smaller than:
400 microns
33
Which NFPA standard provides the requirements for annual testing of water mist systems?
NFPA 25
34
State the hydrostatic testing requirements for an intermediate water mist system with a working pressure of 325 psi?
488 psi for 10 min, then 325 psi for 110 min
35
Which of the following is not a type of water mist nozzle?
Unilateral
36
How does water mist extinguish fires?
Radiant heat absorption
37
What is an advantage of using a water mist system over a conventional sprinkler system?
Less damaging to equipment
38
What is the name of the device that controls the gpm to the vortex emitters?
Flow cartridge
39
What is the primary agent used in the vortex system?
Nitrogen
40
What type of system is the vortex system?
Hybrid system
41
What type of fire are hybrid systems not permitted to be used on?
Reactive metals
42
What is the test duration for hybrid systems?
10 min
43
Cylinders below what pressure must be refilled on hybrid systems?
>10% below normal
44
When using a nitrogen generator, what is the system initially filled with?
Compressed air
45
Identify why AFFF is beneficial for fire protection with flammable liquids?
It moves 3 to 4 times faster than water
46
What type of hazard requires an equal amount of required foam concentrate for the system to be kept in a second reserve tank?
Aircraft hangers
47
What type of pump is used with water mist systems?
Positive displacement pumps
48
Identify the type of foam supply arrangement where pumping and balancing are achieved without the use of electrical or balancing valves.
Pressure proportioning tank with a bladder
49
When checking the level of foam concentrate in a bladder tank, what must one do first?
Drain the pressure in the tank
50
What is the purpose of the perforated siphon tube inside the bladder tanks?
Support the rubber bladder
51
When a foam concentrate is considered high miscible, it can?
Mix easy with water
52
What is the name of the device that maintains discharge pressure for the vortex system during operation?
Automatic flow control
53
How many gallons of foam are produced when three gallons of 3% Foam Concentrate is mixed with 97 gallons of water and the Expansion Factor is 15:1?
1500 Gallons
54
What types of applications are Foam-Water Sprinkler Systems specifically designed to protect?
Class A & B
55
What are the two nominal percentages of Concentrate by volume of solution discharge used in a Foam System?
3% and 6%
56
Which Foam Concentrate is most effective for Subsurface Injection?
Fluroprotein and FFFP (Film Forming Fluroprotein)
57
Where must Strainers in Foam Water Concentration Lines be installed?
Before water operated ball valve
58
What type of pipe is used on Foam Water Sprinkler Systems?
Copper, brass, Steel, Stainless (not Galvanized)
59
What is the length of time the water supply for a Foam Water System must be able to maintain the designed Discharge Rate?
60 min (NFPA 16) 5.2.3.1, 10min for foam/ greater density 7 min 7.2.3.1/ 7.2.3.2
60
What is the maximum rate of expansion when a proportioned mixture of Water and Foam Concentrate comes into contact with air?
1000:1
61
What type of Foam moves across a fuel's surface three to four times faster than conventional foam?
AFFF - Aqueous Film Forming Foam
62
List four methods of introducing Foam Concentrate into a Sprinkler System.
* Premix Dumping * Balanced pressure proportioning * Inline Balanced pressure * Line Proportioning
63
What design characteristics does a Foam Water System have in relation to standard Sprinkler Systems?
Calculations, hangers and testing
64
How is equipment protected when located below airplanes in Aircraft Hangers with a Foam Water System?
Fixed Nozzle piping/ Semi nozzle piping/ W.O.M
65
What type of standard Control Valve equipment is used in a Foam Water System?
Ball Valve/ O.S & Y/ Butter Fly Valve/ Non-rising stem
66
What type of Device is used to discharge foam in a Closed Head Foam System?
Sprinkler head listed to use on foam
67
What type of Devices are used to discharge foam in a Deluge Foam System?
Air-aspirated/ Foam chamber/ Foam Generators/ Open nozzles
68
What discharges from the devices in a Foam Water System?
Foam
69
How does Foam operate when extinguishing a fire?
Foam smothers flames separating for oxygen
70
How does Foam extinguish a fire on a flammable liquid?
Foam forms a blanket separating flammable vapors from oxygen
71
List the five different types of Foam Concentrates that are in use.
* Protein * Fluroprotein * FFFP * AFFF * AR-AFFF * Synthetic Detergent
72
What two rules must be implemented when mixing Foam Concentrate in Storage?
* Same Manufacturer * Must be of the same type * Must pump through bottom of the tank

Week 6 (2 decks)

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