Texas CNG(Compressed Natural Gas) Driver Practice

Hoop wrapped composite cylinders must comply with which DOT standard?

1. DOT FRP1 standard

2. DOT FRP2 standard

3. DOT 3AA specifications

4. ASME Boiler Code

The correct answer is: DOT FRP2 standard

Hoop wrapped composite cylinders must comply with the DOT FRP2 standard. This standard specifically addresses the design and construction of fiberglass reinforced plastic (FRP) cylinders, which are characterized by composite materials that provide strength and structural integrity while maintaining a lightweight characteristic. The FRP2 standard was established to ensure safety and uniformity in the manufacturing processes of these specialized cylinders, which are often used for transporting compressed gases like CNG. Understanding the context of this standard is important as it underscores the importance of safety and regulatory compliance in the transport of hazardous materials. The focus on composite materials in FRP2 emphasizes the need for stringent testing and performance metrics that align with the unique properties of these types of cylinders. In comparison, other options like the DOT 3AA specifications relate specifically to seamless steel cylinders, which fall outside the scope of composite materials, while the ASME Boiler Code pertains to pressure vessels and boilers, not specifically to composite structures. Therefore, the FRP2 standard is the pertinent regulatory framework for hoop-wrapped composite cylinders in the context of CNG transport.