CNG Emergency Procedures and Response 3

Question 1

What is the function of a pressure relief device (PRD) on a CNG cylinder?

Accepted Answer

Vent gas to prevent cylinder rupture from excessive heat or pressure

Answer

Maintain consistent fuel pressure during normal operation

Answer

Alert the driver when the fuel level is low

Answer

Prevent overfilling during the fueling process

Question 2

In the context of CNG emergencies, BLEVE stands for:

Accepted Answer

Boiling Liquid Expanding Vapor Explosion

Answer

Basic Level Emergency Vehicle Evacuation

Answer

Below Lower Explosive Vapor Emission

Answer

Bulk Liquid Emergency Venting Escape

Question 3

What is the recommended minimum safe distance for first responders from a CNG vehicle fully engulfed in fire?

Accepted Answer

300 feet

Answer

25 feet

Answer

50 feet

Answer

100 feet

Question 4

Why should water be continuously applied to CNG cylinders during a vehicle fire?

Accepted Answer

To cool cylinders and delay or prevent PRD activation or structural failure

Answer

To extinguish the CNG flame directly

Answer

To neutralize the natural gas odorant

Answer

To prevent toxic fume release

Question 5

After a CNG vehicle is involved in a collision, the driver should immediately:

Accepted Answer

Shut off the fuel system and exit the vehicle

Answer

Leave the engine running to maintain emergency communications

Answer

Drive to a safe location before stopping

Answer

Open the hood to inspect the CNG cylinder

Question 6

Which condition requires a CNG cylinder to be immediately removed from service?

Accepted Answer

Visible bulging, deep denting, or evidence of fire/heat damage

Answer

Cylinder pressure reading 100 psi below rated maximum

Answer

Minor surface scratches on the outer protective jacket

Answer

Cylinder age exceeding five years from manufacture

Question 7

When first responders arrive at a CNG vehicle accident, their FIRST priority should be:

Accepted Answer

Securing the scene and identifying CNG system components

Answer

Determining the cause of the accident

Answer

Interviewing witnesses for their reports

Answer

Contacting the vehicle manufacturer