What is a cylinder designed for use as part of a CNG system called?

The term used to describe a cylinder specifically designed for use as part of a Compressed Natural Gas (CNG) system is the CNG cylinder. CNG cylinders are engineered to hold gas at high pressures, ensuring the safe storage and transport of natural gas for various applications, including fueling vehicles. These cylinders must meet stringent safety and performance standards to prevent leaks and withstand the extreme conditions they may encounter during use.

While "CNG vessel" might seem like a plausible option, it is typically a broader term that can refer to any container or structure designed to hold gas, not specifically a cylinder. Likewise, "storage tank" and "gas container" are too general and do not accurately define the high-pressure cylinders specifically used in CNG systems. The precise definition of a CNG cylinder highlights its unique construction and intended purpose within the framework of compressed natural gas applications.