What material may be used for approved meters in a CNG system?

In a compressed natural gas (CNG) system, aluminum is a commonly used material for approved meters due to its favorable properties. Aluminum is lightweight, resistant to corrosion, and has good thermal and electrical conductivity, making it suitable for various applications, including metering gas flow. Using aluminum helps ensure that the meter remains robust and reliable over time while also minimizing the overall weight of the equipment, which can be an essential factor in transportation and installation contexts.

Copper, while a good conductor, may not be ideal due to its susceptibility to corrosion when exposed to certain environments. Steel is heavier and can be prone to rust if not properly coated or treated, making it less desirable in applications where weight and corrosion resistance are critical. Plastic is generally not suitable for high-pressure applications associated with CNG due to its lower strength and potential for degradation under pressure and temperature variations. The choice of aluminum aligns with the safety, efficiency, and performance standards needed in CNG systems.