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Week 6 > Foam, Spray, Mist > Flashcards

Foam, Spray, Mist Flashcards

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
Q

What is a design objective of water spray systems?

A

Exposure protection

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26
Q

What is the minimum discharge pressure for an ultra high-speed water spray system nozzle?

A

50 psi

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27
Q

What is the maximum response time of a water spray system?

A

100 milliseconds

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28
Q

What is the hydraulic test pressure of a water spray system with a normal operating pressure of 155 psi?

A

205 psi

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29
Q

Which NFPA is the standard for the installation of water mist systems?

30
Q

What is the average size of a water droplet in a water mist system?

A

100 microns

31
Q

Identify the hazard which can be protected by water mist systems?

A

Class A and diesel engines

32
Q

If using a water mist system to protect against a class B fire, the water droplet must be smaller than:

A

400 microns

33
Q

Which NFPA standard provides the requirements for annual testing of water mist systems?

34
Q

State the hydrostatic testing requirements for an intermediate water mist system with a working pressure of 325 psi?

A

488 psi for 10 min, then 325 psi for 110 min

35
Q

Which of the following is not a type of water mist nozzle?

A

Unilateral

36
Q

How does water mist extinguish fires?

A

Radiant heat absorption

37
Q

What is an advantage of using a water mist system over a conventional sprinkler system?

A

Less damaging to equipment

38
Q

What is the name of the device that controls the gpm to the vortex emitters?

A

Flow cartridge

39
Q

What is the primary agent used in the vortex system?

40
Q

What type of system is the vortex system?

A

Hybrid system

41
Q

What type of fire are hybrid systems not permitted to be used on?

A

Reactive metals

42
Q

What is the test duration for hybrid systems?

43
Q

Cylinders below what pressure must be refilled on hybrid systems?

A

> 10% below normal

44
Q

When using a nitrogen generator, what is the system initially filled with?

A

Compressed air

45
Q

Identify why AFFF is beneficial for fire protection with flammable liquids?

A

It moves 3 to 4 times faster than water

46
Q

What type of hazard requires an equal amount of required foam concentrate for the system to be kept in a second reserve tank?

A

Aircraft hangers

47
Q

What type of pump is used with water mist systems?

A

Positive displacement pumps

48
Q

Identify the type of foam supply arrangement where pumping and balancing are achieved without the use of electrical or balancing valves.

A

Pressure proportioning tank with a bladder

49
Q

When checking the level of foam concentrate in a bladder tank, what must one do first?

A

Drain the pressure in the tank

50
Q

What is the purpose of the perforated siphon tube inside the bladder tanks?

A

Support the rubber bladder

51
Q

When a foam concentrate is considered high miscible, it can?

A

Mix easy with water

52
Q

What is the name of the device that maintains discharge pressure for the vortex system during operation?

A

Automatic flow control

53
Q

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?

A

1500 Gallons

54
Q

What types of applications are Foam-Water Sprinkler Systems specifically designed to protect?

A

Class A & B

55
Q

What are the two nominal percentages of Concentrate by volume of solution discharge used in a Foam System?

56
Q

Which Foam Concentrate is most effective for Subsurface Injection?

A

Fluroprotein and FFFP (Film Forming Fluroprotein)

57
Q

Where must Strainers in Foam Water Concentration Lines be installed?

A

Before water operated ball valve

58
Q

What type of pipe is used on Foam Water Sprinkler Systems?

A

Copper, brass, Steel, Stainless (not Galvanized)

59
Q

What is the length of time the water supply for a Foam Water System must be able to maintain the designed Discharge Rate?

A

60 min (NFPA 16) 5.2.3.1, 10min for foam/ greater density 7 min 7.2.3.1/ 7.2.3.2

60
Q

What is the maximum rate of expansion when a proportioned mixture of Water and Foam Concentrate comes into contact with air?

61
Q

What type of Foam moves across a fuel’s surface three to four times faster than conventional foam?

A

AFFF - Aqueous Film Forming Foam

62
Q

List four methods of introducing Foam Concentrate into a Sprinkler System.

A
  • Premix Dumping
  • Balanced pressure proportioning
  • Inline Balanced pressure
  • Line Proportioning
63
Q

What design characteristics does a Foam Water System have in relation to standard Sprinkler Systems?

A

Calculations, hangers and testing

64
Q

How is equipment protected when located below airplanes in Aircraft Hangers with a Foam Water System?

A

Fixed Nozzle piping/ Semi nozzle piping/ W.O.M

65
Q

What type of standard Control Valve equipment is used in a Foam Water System?

A

Ball Valve/ O.S & Y/ Butter Fly Valve/ Non-rising stem

66
Q

What type of Device is used to discharge foam in a Closed Head Foam System?

A

Sprinkler head listed to use on foam

67
Q

What type of Devices are used to discharge foam in a Deluge Foam System?

A

Air-aspirated/ Foam chamber/ Foam Generators/ Open nozzles

68
Q

What discharges from the devices in a Foam Water System?

69
Q

How does Foam operate when extinguishing a fire?

A

Foam smothers flames separating for oxygen

70
Q

How does Foam extinguish a fire on a flammable liquid?

A

Foam forms a blanket separating flammable vapors from oxygen

71
Q

List the five different types of Foam Concentrates that are in use.

A
  • Protein
  • Fluroprotein
  • FFFP
  • AFFF
  • AR-AFFF
  • Synthetic Detergent
72
Q

What two rules must be implemented when mixing Foam Concentrate in Storage?

A
  • Same Manufacturer
  • Must be of the same type
  • Must pump through bottom of the tank

Week 6 (2 decks)

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