(a) Where necessary to provide an automatic fire sprinkler system using antifreeze solutions to serve an unheated area, only antifreeze approved by the Authority may be used. Such systems shall have not more than 20 heads and shall have at all times prominently posted, within two feet of the fill location, a warning sign at least eight inches by ten inches in size, having letters of one inch in height, bearing the following statement; "USE ONLY MATERIALS AUTHORIZED BY THE CITY OF MASON."
(b) Signs are to be furnished and maintained by the owner and must be of materials and design acceptable to the Authority.
(c) In the supply line to each antifreeze system, there shall be a U-loop provided in the supply piping. The downleg (supply side) of the U-loop shall drop at least 1.25 times the amount of rise of the up leg of the U. The minimum length of the downleg shall be four feet.
(d) Where a system using an antifreeze solution approved by the Authority is connected to the potable water system, a reduced pressure zone backflow prevention device shall be provided in the branch serving the antifreeze system and above the highest point in the line containing antifreeze solution.
(e) Where a system using an antifreeze solution approved by the Authority is connected to a separate fire protection system, a single check valve and outside screw and yoke valve in the supply branch of the antifreeze system shall suffice.
(f) When requested in writing by an owner, occupant or lessee, the Authority may permit use of antifreeze solutions not approved by the Authority, provided a reduced pressure principle backflow preventor is installed at the connection to the potable water system.
(Ord. No. 144, 5-16-2005)