CNG Properties and Safety 2

Question 1

What is the primary component of compressed natural gas (CNG)?

Accepted Answer

Methane

Answer

Propane

Answer

Butane

Answer

Ethane

Question 2

CNG is stored in vehicle cylinders at approximately what pressure?

Accepted Answer

3,600 psi

Answer

1,000 psi

Answer

500 psi

Answer

10,000 psi

Question 3

What color are CNG fuel lines typically required to be for identification purposes?

Accepted Answer

Orange

Answer

Red

Answer

Blue

Answer

Yellow

Question 4

Which property makes CNG safer than gasoline in terms of spill behavior?

Accepted Answer

It dissipates into the atmosphere rather than pooling

Answer

It is heavier than air and settles to the ground

Answer

It is non-flammable at ambient temperatures

Answer

It reacts with water to become inert

Question 5

What is the Lower Flammability Limit (LFL) of methane in air?

Accepted Answer

5%

Answer

1%

Answer

15%

Answer

25%

Question 6

Which type of CNG cylinder is made entirely of metal with no composite wrapping?

Accepted Answer

Type 1

Answer

Type 2

Answer

Type 3

Answer

Type 4

Question 7

A CNG cylinder must be removed from service when it reaches what condition?

Accepted Answer

When it exceeds its requalification date or shows structural damage

Answer

When it shows any surface rust

Answer

When it has been in service for 5 years

Answer

When it has been filled more than 500 times