An approved double check backflow prevention assembly shall be the minimum protection on all new fire sprinkler systems using piping material that is not approved for potable water use, and/or that does not provide for periodic flow through. A reduced pressure principle backflow prevention assembly must be installed, if any solution other than the potable water can be introduced into the sprinkler system. Retrofitting on fire sprinkler systems will be required in each of the following circumstances:
A. Where improper maintenance has occurred;
B. On all high health hazard systems;
C. Wherever the city's specialist deems necessary; and
D. Wherever required by the WAC.
In the event an assembly is installed on a designated lateral, a detector assembly commensurate with the degree of hazard will be required. (Ord. 819, 2-21-2007)