FREE CNG Systems Questions and Answers

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CNG compression, storage, and dispensing must be _______________.

Correct! Wrong!

Explanation:
CNG compression, storage, and dispensing must be located and conducted outdoors to minimize the risk of gas leaks accumulating in enclosed spaces. Operating CNG equipment outdoors allows for better ventilation and reduces the potential for gas buildup, which can pose safety hazards such as fire or explosion.

What is a cascade storage system?

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Explanation:
A cascade storage system in compressed natural gas (CNG) refers to a method of storing gas in multiple cylinders or tanks arranged in a cascading configuration. This system allows for efficient storage and utilization of CNG, where the gas is transferred from one cylinder to another as needed for use in vehicles or other applications.

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

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Explanation:
All pipe fittings in compressed natural gas systems must be made of forged steel and stamped with a rating of 6,000 psi or greater to ensure they can withstand the high pressure of the gas without risk of failure or leakage.

What must be used when venting CNG into the atmosphere?

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Explanation:
When venting Compressed Natural Gas (CNG) to the atmosphere, a vent pipe or stack must be used to safely direct the released gas away from the surrounding area. This prevents potential hazards associated with the release of CNG into the atmosphere.

Which gas does CNG contain?

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Explanation:
CNG stands for Compressed Natural Gas, and it primarily consists of methane, which is the main component of natural gas.

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

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Explanation:
The purpose of the shut-off valve at the compressed natural gas (CNG) cylinder is to cut off the gas flow from the tank to the lines. This valve is essential for safety, allowing the flow of gas to be stopped in case of emergencies or maintenance needs.

What does CNG stand for?

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Explanation:
Compressed Natural Gas. It's an abbreviation for the type of fuel used in natural gas vehicles, which is compressed to reduce its volume for storage and transportation.

For safety, CNG equipment must not be located _____________.

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Explanation:
CNG equipment must not be located within 6 feet or directly beneath an electric transmission line to minimize the risk of electrical hazards. Placing CNG equipment too close to high-voltage power lines can increase the likelihood of electric shock or arcing, posing a danger to personnel and equipment.

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

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Explanation:
CNG fuel supply cylinders must have a rated service pressure of at least 2400 pounds per square inch gauge (psig) at 70°F to ensure safe and effective operation.

What must underground piping be protected from?

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Explanation:
Underground piping must be protected from corrosion to ensure its integrity and longevity. Corrosion can weaken the pipes, leading to leaks and potential hazards. Protective measures such as coatings and cathodic protection systems are commonly used to prevent corrosion in underground piping systems.

Which of the following materials is commonly used for the construction of high-pressure fuel storage cylinders in compressed natural gas (CNG) vehicles?

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Explanation:
High-pressure fuel storage cylinders in CNG vehicles are typically constructed from steel due to their strength and ability to withstand the high pressure of compressed natural gas. Steel cylinders are durable and provide the necessary safety for storing and transporting CNG.

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