A702 Natural Gas Emergencies (09-01-2014)

Question 1

[A702 Natural Gas Emergencies]

What is the most common of all fuel gases?

Answer 1

Natural Gas

Question 2

[A702 Natural Gas Emergencies]

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

Answer 2

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

Question 3

[A702 Natural Gas Emergencies]

What is used to oderize natural gas?

Answer 3

Methyl Mercaptan

Question 4

[A702 Natural Gas Emergencies]

Methyl Mercaptan is _________ than air:

Answer 4

Heavier

Question 5

[A702 Natural Gas Emergencies]

When is natural gas not odorized (3)?

Answer 5

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

Question 6

[A702 Natural Gas Emergencies]

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

Answer 6

Direct reading flammable gas detectors

Question 7

[A702 Natural Gas Emergencies]

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

Answer 7

Blue and silver diamond shaped decal

Question 8

[A702 Natural Gas Emergencies]

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

Answer 8

Black and silver diamond shaped decal

Question 9

[A702 Natural Gas Emergencies]

LNG-fueled vehicles are required to have a:

Answer 9

On-board gas detection system

Question 10

[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 _______ _______ ________:

Answer 10

• 10%
• Lower Explosive Limit

Question 11

[A702 Natural Gas Emergencies]

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

Answer 11

1. Control of the leak
2. control of ignition sources

Question 12

[A702 Natural Gas Emergencies]

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

Answer 12

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

Question 13

[A702 Natural Gas Emergencies]

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

Answer 13

• 8 inches or larger
• 150 feet

Question 14

[A702 Natural Gas Emergencies]

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

Answer 14

1% of the lower explosive limit

Question 15

[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:

Answer 15

50 feet

Question 16

[A702 Natural Gas Emergencies]

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

Answer 16

212 degrees F

Question 17

[A702 Natural Gas Emergencies]

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

Answer 17

75 feet

Question 18

[A702 Natural Gas Emergencies]

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

Answer 18

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

Question 19

[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?

Answer 19

Thermal protection against extremely cold temps

Question 20

[A702 Natural Gas Emergencies]

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

Answer 20

75 feet

Question 21

[A702 Natural Gas Emergencies]

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

Answer 21

Back-up lines and rescue stand-by

Question 22

[A702 Natural Gas Emergencies]

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

Answer 22

75 feet

Question 23

[A702 Natural Gas Emergencies]

Cryogens are stored at temperatures below:

Answer 23

-260 degrees

Question 24

[A702 Natural Gas Emergencies]

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

Answer 24

600 to 1

Question 25

# [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:

Answer 25

- 600 cu feet - 100% - 12,000 cu feet

Question 26

# [A702 Natural Gas Emergencies] When controlling fires that involve cryogenic containers, immediately establish hot zone with a radius of:

Answer 26

75 feet

Question 27

# [A702 Natural Gas Emergencies] When controlling gas releases inside of structures, open the doors of structures and perform:

Answer 27

PPV from upwind

Question 28

# [A702 Natural Gas Emergencies] When controlling natural gas fires inside structures who should be notified that the incident may have involved natural gas (2):

Answer 28

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