NFPA-99 Practice Exam

In a bulk supply system, which alarm systems shall be activated when the cryogenic liquid reserves contents are reduced to a one-day supply?

1. Area

2. Local

3. Master

4. Master and area

The correct answer is: Master

In a bulk supply system, a master alarm system is critical for overseeing the overall operation and safety of cryogenic liquid reserves. When the contents are reduced to a one-day supply, it indicates a significant depletion of available resources, which necessitates immediate attention and action. The master alarm serves to alert personnel responsible for monitoring the system, facilitating quick decision-making for refilling or taking necessary precautions to ensure the continued safe operation of the system. The master alarm system effectively centralizes the alerts, allowing for a coordinated response. This is essential in environments where the safe and continuous supply of cryogenic liquids is paramount because it can directly impact operational integrity and safety protocols. The activation of only the master alarm in this scenario emphasizes the importance of having a primary alerting mechanism that ensures that all necessary stakeholders are informed of the critical status of the liquid reserves. While area and local alarms serve important functions in specific zones or localized monitoring, their activation alone would not guarantee that all necessary personnel are aware of the critical situation. This is why the focus on the master alarm system in such a scenario is particularly important for maintaining safety and operational readiness in a bulk supply system.