According to NFPA 25, dry-type sprinklers must be tested after an initial period of how many years of service?

According to NFPA 25, dry-type sprinklers must be tested after an initial period of 10 years of service. This requirement is in place to ensure that the sprinklers remain functional and effective in case of a fire. Testing at this interval helps identify any issues such as corrosion or mechanical failure that could compromise the sprinkler system's performance.

The reason for setting the interval at 10 years reflects the understanding of the materials used in the construction of dry-type sprinklers and the potential for deterioration over time. Regular testing can help maintain the integrity of the fire protection system, ensuring safety for occupants in the building. After this initial test, ongoing maintenance and testing should follow the guidelines specified in NFPA 25 to ensure continued compliance and safety.