Which NFPA standard governs the design and installation of water-based sprinkler systems?

• A. NFPA 25
• B. NFPA 72
• C. NFPA 101
• D. NFPA 13

Answer: (D)

NFPA 13 is the standard that governs the design and installation of water-based sprinkler systems. It lays out how these systems should be laid out, sized, and configured—from the type of system (wet, dry, deluge, foam) to pipe routing, sprinkler head placement, and spacing. It also covers water supply requirements and hydraulic calculations to ensure the system can deliver the right pressure and flow to all sprinklers when needed. This standard provides the technical details that ensure a sprinkler system will perform as intended in a fire.

Other standards cover different aspects: NFPA 25 deals with inspecting, testing, and maintaining sprinkler systems after installation; NFPA 72 handles fire alarm and signaling systems; NFPA 101 focuses on life safety and means of egress rather than the technical design of sprinklers. Because of this focus, NFPA 13 is the one that specifically governs how water-based sprinkler systems are designed and installed.