Which standpipe class is associated with a 2 inch riser for buildings under 50 feet?

Which standpipe class is associated with a 2 inch riser for buildings under 50 feet?

• A. Class I standpipes
• B. Class III standpipes
• C. Class II standpipes
• D. All standpipes

Answer: (C)

Standpipe systems are sized and styled based on who uses them and what hose size they deliver. For buildings under 50 feet, a 2-inch vertical riser is paired with a 1.5-inch hose for occupant use, which is the setup of a Class II standpipe. This arrangement lets occupants quickly fight a small fire with a readily accessible 1.5-inch hose while keeping the piping sized to maintain adequate pressure and manageable friction losses. In contrast, Class I is designed for firefighters and uses larger 2.5-inch hose connections and typically a larger riser, and Class III combines both types of outlets (2.5-inch for fire department use and 1.5-inch for occupants) with correspondingly larger risers. There isn’t a standpipe category simply called “All standpipes.”

Standpipe systems are sized and styled based on who uses them and what hose size they deliver. For buildings under 50 feet, a 2-inch vertical riser is paired with a 1.5-inch hose for occupant use, which is the setup of a Class II standpipe. This arrangement lets occupants quickly fight a small fire with a readily accessible 1.5-inch hose while keeping the piping sized to maintain adequate pressure and manageable friction losses. In contrast, Class I is designed for firefighters and uses larger 2.5-inch hose connections and typically a larger riser, and Class III combines both types of outlets (2.5-inch for fire department use and 1.5-inch for occupants) with correspondingly larger risers. There isn’t a standpipe category simply called “All standpipes.”