During service, which parts are not required to be flushed?

During service, which parts are not required to be flushed?

• A. The discharge devices
• B. The control valves
• C. The foam concentrate storage tank
• D. Those portions of the system normally containing foam concentrate when the system is in service

Answer: (B)

Flushing during service targets parts that actually carry or discharge foam solution, to remove air, debris, and any degraded residues that could affect foam quality and discharge performance. The discharge devices must be flushed to purge air and ensure clean, consistent foam delivery. The foam concentrate storage tank and the portions of the piping that normally contain foam concentrate when the system is in service are also flushed to purge any stale concentrate and contaminants before use. Control valves, on the other hand, are not part of the foam-concentrate flow path in normal service and are primarily mechanical devices for regulating flow; they do not require flushing as part of the foam system service.

Flushing during service targets parts that actually carry or discharge foam solution, to remove air, debris, and any degraded residues that could affect foam quality and discharge performance. The discharge devices must be flushed to purge air and ensure clean, consistent foam delivery. The foam concentrate storage tank and the portions of the piping that normally contain foam concentrate when the system is in service are also flushed to purge any stale concentrate and contaminants before use. Control valves, on the other hand, are not part of the foam-concentrate flow path in normal service and are primarily mechanical devices for regulating flow; they do not require flushing as part of the foam system service.