Under what circumstances must downstream equipment be protected from over-pressurization?

Downstream equipment must be protected from over-pressurization primarily when it is not rated for the upstream supply pressure. This situation is critical because if the downstream equipment is exposed to pressures greater than it is designed to handle, it can lead to catastrophic failures, safety hazards, and potential damage to the system. Understanding the pressure ratings of all equipment involved in a system ensures safety and functionality.

Ensuring compatibility between the upstream supply pressure and the pressure ratings of downstream equipment is essential for safe operation. Using protection mechanisms such as pressure relief valves or pressure regulators becomes necessary in these circumstances to prevent any potential over-pressurization incidents, thereby safeguarding the integrity of the system and the safety of personnel working with or around the equipment.