For both Electric & Diesel pumps, the wet pit suction screens should be:

• A. Obstructed
• B. Unobstructed and in place
• C. Removed during operation
• D. Only for diesel

Answer: (B)

Wet pit suction screens must be in place and unobstructed to protect the pump while allowing full, clean flow. The screens act as a barrier against debris entering the pump, but if they are obstructed, suction losses rise, flow decreases, and the pump can struggle to develop the required pressure—potentially causing cavitation or loss of capacity during a firefighting demand. Removing screens during operation would let debris enter the pump, risking clogging, damage to impellers and bearings, and reduced reliability just when you need it most. This protection applies to both electric and diesel pumps; keeping the screens in place and clean ensures safe, effective operation. Regular inspection and cleaning maintain this protection without compromising flow.