Texas CNG(Compressed Natural Gas) Driver Practice

Which material must be used for pressure-containing parts of dispensing equipment?

1. Plastic

2. Aluminum

3. Steel, ductile iron, or forged steel

4. Fiberglass

The correct answer is: Steel, ductile iron, or forged steel

The correct choice for materials used in pressure-containing parts of dispensing equipment is steel, ductile iron, or forged steel. These materials are specifically chosen for their ability to withstand high pressures that are typical in gas dispensing systems, such as those used for compressed natural gas (CNG). They offer the necessary strength and durability to ensure the safe containment of gases under pressure, reducing the risk of leaks or failures during operation. Steel and ductile iron are particularly advantageous due to their high tensile strength and resistance to fatigue, which is essential for the components that experience repeated pressure cycles. Forged steel, known for its uniform grain structure, adds to the resilience of critical parts, making it less susceptible to cracking under stress. In contrast, materials like plastic, while lightweight and resistant to corrosion, do not possess the structural integrity required for high-pressure applications. Aluminum, although strong and lightweight, may not have the same pressure ratings as steel and could be less reliable in rigorous conditions. Fiberglass, while useful in many applications for its resistance to corrosion and lightweight properties, also lacks the necessary strength and pressure tolerance for use in pressure-containing components of gas dispensing systems.