CNG Systems

Question 1

What does CNG stand for?

Accepted Answer

Compressed Natural Gas

Answer

Colored Natural Gas

Answer

Compression and Gas

Answer

Combustible Natural Gas

Question 2

Which gas does CNG contain?

Accepted Answer

Methane

Answer

Butane

Answer

Oxygen

Answer

Carbon Monoxide

Question 3

What does the shut-off valve at the compressed natural gas cylinder serve as?

Accepted Answer

To cut the gas flow from tank to lines.

Answer

To stop the air from entering the intake.

Answer

To cut the gas from entering the intake.

Answer

To cut the gas flow from lines to the regulator.

Question 4

What is the required rated service pressure for fuel supply cylinders?

Accepted Answer

At least 2400 psig at 70°F

Answer

At least 2400 psig at 30°F

Answer

At least 2500 psig at 70°F

Answer

None of the above.

Question 5

What must be used when venting CNG into the atmosphere?

Accepted Answer

A vent pipe or stack

Answer

A transfer hose

Answer

A pressure-filled pipe

Answer

All of the above.

Question 6

What must underground piping be protected from?

Accepted Answer

Corrosion

Answer

Erosion

Answer

Oxidation

Answer

Combustion

Question 7

For safety, CNG equipment must not be located _____________.

Accepted Answer

within 6 feet or directly beneath the electric transmission line

Answer

equipment can be placed anywhere

Answer

near a refueling connector

Answer

near uncoated threaded socket welded joints

Question 8

CNG compression, storage, and dispensing must be _______________.

Accepted Answer

located and conducted outdoors

Answer

spaced no more than 4 feet apart

Answer

checked for valve service ratings

Answer

None of the above.

Question 9

All pipe fittings in CNG systems must be made of forged steel and stamped with ________.

Accepted Answer

6,000 psi or greater

Answer

5,995 psi or greater

Answer

4,995 psi or greater

Answer

None of the above.

Question 10

What is a cascade storage system?

Accepted Answer

A method of storing gas in multiple cylinders or tanks.

Answer

A downstream

Answer

A DOT standard

Answer

A type of fuel system