Class III and class I standpipe systems are designed for what pressures and flows?

Class III and Class I standpipe systems are specifically designed to deliver a certain level of water flow and pressure to effectively fight fires in buildings. Class I systems, primarily intended for fire department use, require a minimum flow and pressure to ensure that firefighters can control and extinguish a fire quickly and efficiently.

The typical specification for Class III and Class I systems is 250 gallons per minute (gpm) at 100 pounds per square inch (psi). This flow rate is deemed sufficient for effective firefighting operations, providing a robust supply that can support multiple lines in a fire situation. The 100 psi pressure ensures that the water can reach elevated areas of a structure and maintain adequate velocity even when flow demand is high, which is crucial during an emergency.

This flow and pressure standard reflects the industry's understanding of what is necessary to combat typical residential and commercial fires effectively. Therefore, the correct answer encompasses the expectations and operational requirements established for these systems.