What is the primary purpose of a standpipe system in building fire protection?

• A. To provide cooling water for occupants.
• B. To irrigate fire suppression systems.
• C. To supply water for firefighting operations when external water supply is insufficient.
• D. To generate electrical power for pumps.

Answer: (C)

Standpipe systems exist to provide a reliable internal water source for firefighting, especially when the external water supply isn’t enough or can’t reach upper floors quickly. They bring water from the building’s supply through a network of pipes to outlets on multiple levels that firefighters can connect hoses to and use to suppress the fire where it is. In practice, a standpipe may be fed by a building pump and may link to a fire department connection to boost supply when needed. Some systems are kept constantly full of water (wet) while others are empty until charged by the fire department or building pump (dry), but the core idea is to ensure immediate, adequate water flow and pressure inside the building for firefighting. This function is distinct from cooling occupants or delivering irrigation, and from providing electrical power.