Strainers shall be installed so as to be accessible for cleaning (flushing) while maintaining system discharge during an emergency. Which option best describes this requirement?

• A. Strainers must be hidden for protection
• B. Strainers must be positioned near the pump
• C. Strainers shall be accessible for cleaning during emergencies
• D. Strainers shall be installed so as to be accessible for cleaning (flushing) while maintaining system discharge during an emergency

Answer: (D)

Strainers must be installed so they can be cleaned (flushed) without interrupting the system’s discharge during an emergency. In foam-water systems, debris in a strainers can quickly choke flow and compromise discharge performance, so maintenance needs to be possible while the system remains in service. An arrangement that ensures accessibility for cleaning and provides a way to flush the strainers without stopping discharge keeps protection active during an incident. Hidden strainers or placements that don’t guarantee continued flow during cleaning fail to meet the essential requirement of maintaining emergency discharge, while simply noting accessibility without addressing discharge continuity also falls short. The best description combines both accessibility and the ability to flush while the system stays pressurized and discharging in an emergency.