What is the primary characteristic of a compressed natural gas (CNG) system?

The primary characteristic of a compressed natural gas (CNG) system is that it includes various safety devices and components. CNG systems are designed to operate at high pressures, and safety is a crucial aspect of their design and operation. This includes pressure relief valves, composite cylinders, emergency shut-off switches, and other mechanisms that work together to ensure safe handling and storage of the gas. These safety features are essential not only to protect the equipment but also to safeguard the operators and the surrounding environment.

While it is true that some CNG systems may involve filtration and purification processes, the fundamental characteristic that differentiates a CNG system is the emphasis on safety components. Protecting against potential hazards such as leaks or over-pressurization is paramount in the CNG industry, making safety devices the core aspect of these systems.