What is the purpose of risers in firemain systems?

• A. Limit maximum water temperature
• B. Store backup fuel
• C. Act as a flow meter
• D. Discharge water from fire pumps into firemain in single main systems

Answer: (D)

Risers serve as vertical feeders that bring water from the fire pumps into the firemain distribution network, allowing the supply to reach all decks in a single main system. By carrying pressurized water upward, they enable water to be drawn off at hose stations and outlets on different levels, ensuring firefighting water is available where needed. This is why risers’ purpose is to discharge water from pumps into the firemain and distribute it through the system.