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Policies Section A > A702 Natural Gas Emergencies (09-01-2014) > Flashcards

A702 Natural Gas Emergencies (09-01-2014) Flashcards

1
Q

[A702 Natural Gas Emergencies]

What is the most common of all fuel gases?

A

Natural Gas

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2
Q

[A702 Natural Gas Emergencies]

What are the (4) different ways natural gas is stored and transported?

A
  1. As a gas in pipelines
  2. As a gas in high-pressure containers (CNG)
  3. As a liquefied gas (LNG)
  4. As a cryogenic liquid in insulated/refrigerated containers
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3
Q

[A702 Natural Gas Emergencies]

What is used to oderize natural gas?

A

Methyl Mercaptan

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4
Q

[A702 Natural Gas Emergencies]

Methyl Mercaptan is _________ than air:

A

Heavier

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5
Q

[A702 Natural Gas Emergencies]

When is natural gas not odorized (3)?

A
  1. When it is transported by interstate pipeline
  2. When it is in a liquefied state
  3. When it is stored in cryogentic fluid
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6
Q

[A702 Natural Gas Emergencies]

The only way to establish the presence of gas is by:

A

Direct reading flammable gas detectors

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7
Q

[A702 Natural Gas Emergencies]

Vehicles powered by compressed natural gas can be identified by this decal:

A

Blue and silver diamond shaped decal

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8
Q

[A702 Natural Gas Emergencies]

Vehicles powered by liquefied natural gas can be identified by this decal:

A

Black and silver diamond shaped decal

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9
Q

[A702 Natural Gas Emergencies]

LNG-fueled vehicles are required to have a:

A

On-board gas detection system

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10
Q

[A702 Natural Gas Emergencies]

Monitor the perimeter of the hot zone with direct reading instruments to ensure that at no time does a gas/air mixture exceed ______ percent of the _______ _______ ________:

A
  • 10%
  • Lower Explosive Limit
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11
Q

[A702 Natural Gas Emergencies]

What are the 2 most important mitigation considerations at natural gas emergencies?

A
  1. Control of the leak
  2. control of ignition sources
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12
Q

[A702 Natural Gas Emergencies]

What is the formula for determining the hot zone area in feet of natural gas leaks from pipelines?

A

The diameter of the gas pipe (in inches) X 8 + 40

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13
Q

[A702 Natural Gas Emergencies]

For pipes ___ inches or larger, evacuate a radius of ___ feet:

A
  • 8 inches or larger
  • 150 feet
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14
Q

[A702 Natural Gas Emergencies]

Secondary exclusion zones should be set at a distance where readings do not exceed:

A

1% of the lower explosive limit

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15
Q

[A702 Natural Gas Emergencies]

When controlling leaks from high pressure natural gas containers (CNG), an initial hot zone with a radius of ___ feet should be established immediately:

A

50 feet

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16
Q

[A702 Natural Gas Emergencies]

High-pressure tanks have fusible plugs that melt at what temperature?

A

212 degrees F

17
Q

[A702 Natural Gas Emergencies]

When controlling a leak from a liquefied natural gas container, immediately establish a hot zone with a radius of:

A

75 feet

18
Q

[A702 Natural Gas Emergencies]

Why should you not spray water onto liquefied gas containers or spilled liquid natural gas?

A

Because it will heat the tank and gas and cause the volume of the gas vapor to increase

19
Q

[A702 Natural Gas Emergencies]

Any person entering the hot zone of a leaking liquefied natural gas container incident should enter with full PPE and SCBA, and what other type of protection?

A

Thermal protection against extremely cold temps

20
Q

[A702 Natural Gas Emergencies]

When controlling fires involving liquefied natural gas containers, immediately establish a hot zone with a radius of:

A

75 feet

21
Q

[A702 Natural Gas Emergencies]

What should be set up and ready before entry into the hot zone at natural gas incidents?

A

Back-up lines and rescue stand-by

22
Q

[A702 Natural Gas Emergencies]

When controlling leaks from cryogenic containers, immediately establish a hot zone with a radius of:

A

75 feet

23
Q

[A702 Natural Gas Emergencies]

Cryogens are stored at temperatures below:

A

-260 degrees

24
Q

[A702 Natural Gas Emergencies]

When cryogens are released from a container, they have tremendous expansion ratios, often in excess of:

A

600 to 1

25
Q

[A702 Natural Gas Emergencies]

1 cubic foot of liquefied natural gas can produce ____ cubic feet of _______ percent gas vapor and a flammable vapor cloud in excess of ______ cubic feet:

A
  • 600 cu feet
  • 100%
  • 12,000 cu feet
26
Q

[A702 Natural Gas Emergencies]

When controlling fires that involve cryogenic containers, immediately establish hot zone with a radius of:

A

75 feet

27
Q

[A702 Natural Gas Emergencies]

When controlling gas releases inside of structures, open the doors of structures and perform:

A

PPV from upwind

28
Q

[A702 Natural Gas Emergencies]

When controlling natural gas fires inside structures who should be notified that the incident may have involved natural gas (2):

A
  1. AFD Investigator (If was required to respond)
  2. Gas company

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