Compressed Natural Gas(CNG) storage vessels, are mainly used for fixed natural gas charging stations.
Its structure is that usually three vessels of 1,300 liters for content volume are combined into one module. In the case of large storage stations, several modules can be installed.

So far most of the domestic CNG storage vessels in Korea have been supplied by overseas manufacturers, however as NK started development and supply with its exclusive technology in response to the trend increasing natural gas vehicles and expanded installation of charging stations, not only have the imports been completely replaced, but also more and more of the NK CNG storage vessels are being used by charging stations abroad, in response to the active demand for natural gas throughout the world.

The specifications for vessel design, manufacture, and inspection comply with the ASME standard of the US as well as the standard of Korea Gas Safety Corporation. The vessels are being manufactured and exported to countries all over the world.