What must be installed if any piece of equipment can be isolated as a separate unit?

In fire alarm and suppression systems, when equipment is designed such that it can be isolated as a separate unit, it is crucial to install a safety valve. Safety valves serve an essential purpose in ensuring that pressure systems can operate safely and effectively, minimizing the risk of over-pressurization or malfunction. This is particularly important in fire suppression systems where reliable operation is critical for safety.

The requirement for a safety valve ensures that if the isolated unit fails or is taken offline for maintenance, there’s a mechanism to relieve excess pressure or manage system integrity, thus preventing potential hazards. This further ensures the overall reliability of the fire alarm or suppression system, as safety valves are designed to operate automatically to protect the system during unforeseen conditions.

In contrast, while gauges, locked valves, or systems being able to run without certain components can be relevant to system design, they do not address the critical need for safety within isolated equipment units in the same direct manner as the requirement for a safety valve does.