What pressures and flows are class II standpipe systems designed for?

Class II standpipe systems are specifically designed for use by trained personnel, such as firefighters, and are intended to provide a means for delivering water at sufficient pressure and flow to combat fires effectively. The National Fire Protection Association (NFPA) provides guidelines regarding the design and performance of standpipe systems.

The correct answer indicates that Class II standpipe systems are designed for a flow of 100 gallons per minute (gpm) at a discharge pressure of 65 pounds per square inch (psi). This flow rate and pressure are critical for ensuring that the water delivered through these systems can be used effectively to suppress or control a fire.

The 100 gpm flow rate is substantial enough to allow for adequate firefighting capabilities, while the pressure of 65 psi ensures that the water reaches the upper floors of a building or other areas that may be affected by a fire. These specifications are tailored to ensure that firefighters can perform their duties effectively, delivering sufficient water under pressure to reach the fire and utilize the hose lines effectively.

Understanding these specifications helps in appreciating how important they are in firefighting operations, ensuring the right volume and pressure is available where it is needed most during an emergency situation.