What must pressure relief devices be fitted without?

Pressure relief devices are critical components in systems using compressed natural gas (CNG) because they prevent dangerous over-pressurization by automatically venting excess pressure. It is essential that these devices function efficiently and effectively without being hindered by any additional equipment that could compromise their operation.

Devices like lifting mechanisms may introduce unintended delays or mechanical failures that can prevent a pressure relief device from performing its intended safety function. These devices are designed to react automatically to pressure changes and should not require any manual intervention or mechanical assistance to operate correctly. Therefore, fitting pressure relief devices with lifting devices would counteract their purpose of ensuring immediate and automatic pressure relief.

By ensuring these devices do not incorporate lifting mechanisms, we maintain their reliability and responsiveness in emergency situations, thereby enhancing the safety of the overall CNG system.