FF Ops Bulletin 3 - Sheet2 Flashcards
From the Firefighting Operations Bulletins:
Buses in the Metro fleet contain how many CNG(compressed natural gas) tanks?
7
From the Firefighting Operations Bulletins:
At what PSI do the CNG tanks of Metro buses operate?
3600 PSI
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?
3400 and 4000
From the Firefighting Operations Bulletins:
Where are the CNG tanks located?
On the roof.
From the Firefighting Operations Bulletins:
How much does a CNG tank weigh?
269 pounds
From the Firefighting Operations Bulletins:
Each CNG tank is ___ long and ___ in diameter?
120 inches and 15.9 inches
From the Firefighting Operations Bulletins:
What is the CNG tank constucted of?
Light weight plastic wrapped with carbon glass fiber
From the Firefighting Operations Bulletins:
Where is the independent shutoff of a CNG tank located?
at the end of the tank
From the Firefighting Operations Bulletins:
How do you shut offthe gas of the CNG tank?
turn the lever 90 degrees
From the Firefighting Operations Bulletins:
How many PRD’s(pressure relief devices) are on a bus?
8
From the Firefighting Operations Bulletins:
Where can the PRD’s on a Metro bus be located?
in the roof area
From the Firefighting Operations Bulletins:
When will the PRD activate?
at 5400 PSI or when the tank is heated to 220 degrees (f)
From the Firefighting Operations Bulletins:
How many methane sensors are located on the bus?
4
From the Firefighting Operations Bulletins:
Where are the methane sensors located?
2 in the tank compartment, 2 in the engine compartment
From the Firefighting Operations Bulletins:
What are the 2 modes of a methane sensor?
trace and significant
From the Firefighting Operations Bulletins:
If a ____ alert is activated, the engine will shut down.
significant
From the Firefighting Operations Bulletins:
What is the most practical way to extinguish a CNG fire?
shut of the gas at the source
From the Firefighting Operations Bulletins:
CNG burns what color flame?
orange
From the Firefighting Operations Bulletins:
Is a high pressure leak, likely to ignite?
No, it’s too rich to burn
From the Firefighting Operations Bulletins:
Temperature sensors release an extinguishing agent, when reaching what temperature?
280 degrees (f)
From the Firefighting Operations Bulletins:
Where else can the extinguishing agent be activated?
near the driver
From the Firefighting Operations Bulletins:
What is CNG mostly made up of?
methane
From the Firefighting Operations Bulletins:
What is added to CNG to give it an odor?
mercaptan
From the Firefighting Operations Bulletins:
Where is the fueling compartment door on a CNG bus located?
right rear of the bus
From the Firefighting Operations Bulletins:
What is the flash point of CNG?
560 degrees (f)
From the Firefighting Operations Bulletins:
For minor CNG leaks remove ignition sources ___ft. For major leaks ___300 ft.
100 and 300
From the Firefighting Operations Bulletins:
In confined spaces, large volumes of CNG can cause ____?
Asphyxiation
From the Firefighting Operations Bulletins:
____ pressure leaks will be noticed by their odor, ____ pressure leaks will be noticed by the sound?
Low and High
