What does the term 'CNG system' NOT include?

The term 'CNG system' typically refers to the complete infrastructure and components involved in the delivery, storage, and use of compressed natural gas. This encompasses items that are directly involved in the system's operation.

When considering the components of a CNG system, safety devices, cylinders, and the associated piping and fittings are all integral parts of the setup designed to ensure the safe and efficient handling of CNG. Safety devices, for instance, are essential for preventing leaks and controlling pressure within the system. Cylinders are where the CNG is stored at high pressures, and piping and fittings are critical for transporting the gas from the storage to its point of use.

On the other hand, natural gas facilities upstream of the meter—such as production wells, pipelines, and processing plants—are not included in the description of a CNG system. These facilities are involved in the initial production and distribution of natural gas before it reaches the point where it is metered for CNG use. Therefore, this upstream infrastructure falls outside the conventional definition of a 'CNG system' as it relates specifically to the storage and distribution of compressed natural gas for end-users.