What safety feature must compression equipment include regarding pressure?

The inclusion of automatic pressure relief devices in compression equipment is essential for maintaining safety during the operation of a CNG delivery system. These devices are designed to automatically alleviate excess pressure within the system, thereby preventing potential failures or ruptures that could lead to hazardous situations, such as gas leaks or explosions.

Automatic pressure relief devices function by monitoring the pressure within the system and triggering a release mechanism when preset pressure thresholds are exceeded. This ensures that the pressure remains within safe operating limits, protecting both the equipment and personnel nearby.

In contrast, while a pressure monitoring system plays a role in safety by providing real-time data, it does not actively mitigate risks without an automatic response to pressure changes. Manual pressure calibration relies on human intervention and can only be performed periodically, which may not suffice in situations where rapid pressure increases occur. Regular pressure updates are essential for ongoing safety but are not a specific mechanism that actively ensures safety in the same manner as automatic pressure relief devices. Therefore, the correct answer emphasizes the proactive safety measure that automatic pressure relief devices offer.