Which metals are approved for the construction of meters in a CNG system?

The construction of meters in a compressed natural gas (CNG) system must adhere to specific material standards to ensure safety, durability, and performance. Steel and ductile iron are preferred materials because of their strength and ability to withstand high pressures, which is crucial for maintaining the integrity of the meter when handling CNG. These metals are also resistant to the corrosive effects of natural gas, contributing to a longer service life and enhanced reliability of the measurement system.

Aluminum and brass, while used in various applications, may not meet the stringent requirements set for gas meters in high-pressure environments. Options suggesting that any metal or only plastic could be used lack the essential durability and safety characteristics needed in a CNG system. Thus, the selection of steel and ductile iron aligns with industry standards for ensuring safe and effective operation of CNG metering systems.