NFPA 13, 2019 Edition

5.1.5 Water Supply Treatment.

5.1.5.1   Water supplies and environmental conditions shall be evaluated for the existence of microbes and conditions that contribute to microbiologically influenced corrosion (MIC). Where conditions are found that contribute to MIC, the owner(s) shall notify the sprinkler system installer and a plan shall be developed to treat the system using one of the following methods:

(1)          Install a water pipe that will not be affected by the MIC microbes.

(2)          Treat all water that enters the system using an approved bacterial inhibitor.

(3)          Implement an approved plan for monitoring the interior conditions of the pipe at established

                time intervals and locations.

(4)          Install corrosion monitoring station and monitor at established intervals.

 

5.1.5.2   Water supplies and environmental conditions shall be evaluated for conditions that contribute to unusual corrosive properties. Where conditions are found that contribute to unusual corrosive properties, the owner(s) shall notify the sprinkler system installer and a plan shall be developed to treat the system using one of the following methods:

(1)          Install a water pipe that is corrosion resistant.

(2)          Treat all water that enters the system using a listed corrosion inhibitor.

(3)          Implement an approved plan for monitoring the interior conditions of the pipe at established

                intervals and locations.

(4)          Install corrosion monitoring station and monitor at established intervals.

(5)          Fill dry-pipe or preaction systems with nitrogen as a supervisory gas to mitigate against corrosion.

(6)          When using a generator, use an approved nitrogen generator.

 

5.1.5.3   Where listed bacterial inhibitors and/or corrosion inhibitors are used, they shall be compatible with system components. Where used together, they shall be compatible with each other.

 

7.8 Additives and Coatings

 

7.8.1      Additives to the water supply intended for control of microbiological or other corrosion shall be listed for use within fire sprinkler systems.

 

7.8.2      Internal pipe coatings, excluding galvanizing, intended for control of microbiological or other corrosion shall be listed for use within fire sprinkler systems.