What is the purpose of a standpipe or high-rise operation in terms of hydraulics?

• A. To drain water from the building.
• B. To deliver water at elevated levels, maintaining adequate pressure along the vertical path to the fire floor.
• C. To store extra water on the deck.
• D. To reduce water pressure in the system.

Answer: (B)

Standpipe and high-rise operations are about getting water to the upper floors with enough pressure to reach the most distant outlets. When water is pumped up a building, gravity creates a head you must overcome, and every bend or fitting adds friction loss along the vertical pipe. The system is designed so that, despite elevation and losses, firefighters on any floor can open a outlet and achieve a usable nozzle pressure. That’s why the purpose is to deliver water at elevated levels while maintaining adequate pressure along the vertical path to the fire floor. Draining, storing on the deck, or intentionally reducing pressure don’t serve this goal.