How are standpipe systems classified?

Standpipe systems are classified primarily as Class I, Class II, and Class III to ensure that the correct type of system is installed based on the needs of the building and the types of hazards present.

Class I systems are designed for fire departments to connect their hoses and typically have larger diameter outlets to accommodate high flow rates required for combating large fires. They are usually installed in bigger buildings where fire protection needs are significant.

Class II systems are intended for use by trained personnel, such as building occupants. These systems usually include smaller hose connections and may be equipped with hoses and nozzles for rapid response to fires within the building before they escalate.

Class III systems combine features of both Class I and Class II. They are designed for both fire department and occupant use, providing flexibility and ensuring that both trained personnel and emergency services can effectively fight fires.

The other options provide alternative criteria for classification that are not standard in the industry. While hose length, water flow rates, or building types may influence the design or installation of standpipe systems, they do not define the classes of standpipe systems. Thus, the classification by type (Classes I, II, and III) is the accepted standard for categorizing these systems.