FF Ops Bulletin 3 - Sheet2

Question 1

From the Firefighting Operations Bulletins:

Buses in the Metro fleet contain how many CNG(compressed natural gas) tanks?

Answer 1

7

Question 2

From the Firefighting Operations Bulletins:

At what PSI do the CNG tanks of Metro buses operate?

Answer 2

3600 PSI

Question 3

From the Firefighting Operations Bulletins:

Depending on the ambient temperature, the range of the pressure of the tanks can vary from ___ PSI cold to ____PSI warm?

Answer 3

3400 and 4000

Question 4

From the Firefighting Operations Bulletins:

Where are the CNG tanks located?

Answer 4

On the roof.

Question 5

From the Firefighting Operations Bulletins:

How much does a CNG tank weigh?

Answer 5

269 pounds

Question 6

From the Firefighting Operations Bulletins:

Each CNG tank is ___ long and ___ in diameter?

Answer 6

120 inches and 15.9 inches

Question 7

From the Firefighting Operations Bulletins:

What is the CNG tank constucted of?

Answer 7

Light weight plastic wrapped with carbon glass fiber

Question 8

From the Firefighting Operations Bulletins:

Where is the independent shutoff of a CNG tank located?

Answer 8

at the end of the tank

Question 9

From the Firefighting Operations Bulletins:

How do you shut offthe gas of the CNG tank?

Answer 9

turn the lever 90 degrees

Question 10

From the Firefighting Operations Bulletins:

How many PRD’s(pressure relief devices) are on a bus?

Answer 10

8

Question 11

From the Firefighting Operations Bulletins:

Where can the PRD’s on a Metro bus be located?

Answer 11

in the roof area

Question 12

From the Firefighting Operations Bulletins:

When will the PRD activate?

Answer 12

at 5400 PSI or when the tank is heated to 220 degrees (f)

Question 13

From the Firefighting Operations Bulletins:

How many methane sensors are located on the bus?

Answer 13

4

Question 14

From the Firefighting Operations Bulletins:

Where are the methane sensors located?

Answer 14

2 in the tank compartment, 2 in the engine compartment

Question 15

From the Firefighting Operations Bulletins:

What are the 2 modes of a methane sensor?

Answer 15

trace and significant

Question 16

From the Firefighting Operations Bulletins:

If a ____ alert is activated, the engine will shut down.

Answer 16

significant

Question 17

From the Firefighting Operations Bulletins:

What is the most practical way to extinguish a CNG fire?

Answer 17

shut of the gas at the source

Question 18

From the Firefighting Operations Bulletins:

CNG burns what color flame?

Answer 18

orange

Question 19

From the Firefighting Operations Bulletins:

Is a high pressure leak, likely to ignite?

Answer 19

No, it’s too rich to burn

Question 20

From the Firefighting Operations Bulletins:

Temperature sensors release an extinguishing agent, when reaching what temperature?

Answer 20

280 degrees (f)

Question 21

From the Firefighting Operations Bulletins:

Where else can the extinguishing agent be activated?

Answer 21

near the driver

Question 22

From the Firefighting Operations Bulletins:

What is CNG mostly made up of?

Answer 22

methane

Question 23

From the Firefighting Operations Bulletins:

What is added to CNG to give it an odor?

Answer 23

mercaptan

Question 24

From the Firefighting Operations Bulletins:

Where is the fueling compartment door on a CNG bus located?

Answer 24

right rear of the bus

Question 25

From the Firefighting Operations Bulletins:

What is the flash point of CNG?

Answer 25

560 degrees (f)

Question 26

From the Firefighting Operations Bulletins:

For minor CNG leaks remove ignition sources ___ft. For major leaks ___300 ft.

Answer 26

100 and 300

Question 27

From the Firefighting Operations Bulletins:

In confined spaces, large volumes of CNG can cause ____?

Answer 27

Asphyxiation

Question 28

From the Firefighting Operations Bulletins:

____ pressure leaks will be noticed by their odor, ____ pressure leaks will be noticed by the sound?

Answer 28

Low and High