Extra-high, very extra-high, or ultra-high temperature, solder-type fire sprinklers exposed to very hot environments—test every 5 years
Some fire sprinkler environments, like industrial facilities, are extremely hot, and sprinklers with very high, very extra-high, and ultra-high temperature ratings are used above equipment like ovens, furnaces, and boilers. The ambient heat can cause the meltable solder to migrate in fusible-link fire sprinklers (the ones without glass bulbs), affecting their ability to activate. Where these models are in such environments for at least five years, fire sprinkler testing must be done every five years:
From the 2023 edition of NFPA 25 5.3.1.1.1.3* Where solder-type sprinklers with a temperature classification of extra high [325°F (163°C) or greater] are installed and exposed to semi-continuousto continuous maximum allowable ambient temperature conditions for 5 years, one of the following shall occur: (1) The sprinklers shall be replaced. (2) Representative samples of the sprinklers shall be tested and then retested every 5 years.
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