Which of the following are common failure modes for NFPA 2001 systems?

• A. System overpressure incidents.
• B. Operator fatigue and miscommunication only.
• C. Leaks, valve or actuator failure, detector miscalibration, control wiring faults, and improper maintenance.
• D. Software licensing issues only.

Answer: (C)

The situation tests understanding of what tends to break or fail in NFPA 2001 clean agent systems. The most comprehensive and realistic set of failure modes includes leaks in the piping or cylinders, valve or actuator failures that prevent proper discharge or cause unintended release, detector miscalibration that leads to incorrect sensing or timing, control wiring faults that disrupt signals and control logic, and improper maintenance that allows any of these issues to develop unchecked. Together, these categories cover the common mechanical, electrical, sensing, and upkeep problems that can compromise system performance in real-world operation.

Overpressure incidents are not typically listed as a common failure mode in the standard’s practical sense; they’re more about a design or exceptional event rather than ongoing, frequent failures. Operator fatigue and miscommunication are important human factors, but the best answer captures the hardware, sensing, and maintenance failures that NFPA 2001 systems are designed to detect and prevent. Software licensing issues aren’t related to the system’s functional reliability.