How do standpipes differ from attack lines in firefighting operations?

• A. Standpipes are portable hoses; attack lines are fixed within a building.
• B. Standpipes are portable hoses connected to a water supply; attack lines are fixed building water distribution systems.
• C. Standpipes are for ventilation; attack lines are for lighting.
• D. Standpipes are fixed building water distribution systems; attack lines are portable hoses connected to a water supply.

Answer: (D)

The key idea is how water delivery is arranged: standpipes are part of a building’s fixed water system, while attack lines are the hoses firefighters carry and use on the fire ground. Standpipes are built into the structure with outlets on multiple floors, connected to a water source so crews can access water quickly inside the building, especially for upper floors. Attack lines are portable hoses that firefighters deploy to apply water to the fire, and they can be connected to a standpipe outlet or to a fire engine’s pump as needed. That makes standpipes fixed building water distribution systems and attack lines portable hoses connected to a water supply.