Where must pressure relief devices be located?

Pressure relief devices must be located where the temperature is representative of the cylinder's temperature to ensure they function properly under conditions that closely reflect the actual operating environment of the cylinder. This positioning is crucial because pressure relief devices are designed to activate at specific pressure thresholds, and temperature can significantly influence internal pressure. If the pressure relief device is in a location that doesn't accurately represent the temperature within the cylinder, it may not operate as intended, leading to potential safety hazards such as over-pressurization and catastrophic failure.

Being in line with the cylinder’s temperature helps to ensure that the pressure relief device can accurately and reliably respond to pressure changes, maintaining the safety and integrity of the storage system. This focus on temperature relationship aligns directly with industry standards for safety and performance in managing gases like compressed natural gas (CNG).