During maintenance, how should a sprinkler head be replaced, and what codes govern when replacements require re-pressurization testing?

• A. Replace with identical rating and type; after replacement, perform NFPA 25 testing and re-pressurization.
• B. Replace with any head; no testing required.
• C. Replace only if system pressure drops; ignore NFPA.
• D. Replace with identical rating; no testing needed.

Answer: (D)

When replacing a sprinkler head during maintenance, you want to keep the system’s hydraulics intact by using a head with the same rating and type as the one being replaced. This ensures the discharge characteristics, activation temperature, and spray pattern stay exactly as the system was designed, so protection remains consistent across the area.

Re-pressurization testing and NFPA 25 requirements come into play when maintenance activities depressurize the system or involve changes that could affect performance. A simple, identical head replacement does not inherently change the system’s hydraulics, so, in this context, no additional testing is required solely because of the head swap. If maintenance involved draining sections of the system or using a different head with a different rating or type, then re-pressurization testing would be governed by NFPA 25.