System Riser refers to which component?

• A. System Riser
• B. Lavatory
• C. Wet Pipe Sprinkler System
• D. Check Valve

Answer: (A)

The main concept here is what the System Riser actually is in NFPA 13R. The System Riser is the vertical water-supply pipe that brings water from the building’s main supply up to the sprinkler system on each floor and distributes it to the zones and sprinklers. It serves as the backbone of the system, connecting the water source to all the branch lines that feed sprinklers throughout the building.

Think of it as the central vertical conduit that carries water upward to where sprinklers are installed. The other options don’t fit: a lavatory is simply a fixture, not a piping riser; a wet pipe sprinkler system describes the system type, not the physical riser; a check valve is a valve that may be used somewhere in the piping but is not the riser itself.