What additional component must be included in the transfer system of compressed natural gas?

In a compressed natural gas (CNG) transfer system, incorporating a pressure relief device is crucial for maintaining safety and preventing dangerous situations. The pressure relief device ensures that if the internal pressure within the system exceeds safe operating limits, the excess pressure can be safely released. This is vital because CNG is stored at high pressures to keep it in a usable state.

If there were no pressure relief device in place, the risk of a rupture or explosion increases significantly, especially in scenarios where temperature fluctuations might cause pressure to rise within the storage container or pipeline. By allowing for controlled pressure release, these devices provide a safeguard against over-pressurization, contributing to the overall integrity and safe operation of the CNG transfer system.