Section R. 400.18641 - Sprinkler protectionRule 641.
(1) For construction defined as protected ordinary construction, the entire new construction involved shall be protected throughout by an approved automatic sprinkler system.(2) If an adequate water supply from a community water system to supply a sprinkler system does not exist and if the area to be protected is not more than 20,000 square feet, a special pressure tank supply for sprinklers as specified in the 1971 edition of national fire protection association pamphlet no. 22, standard for water tanks for private fire protection which is adopted by reference in R 400.18659, shall be provided. The special pressure tanks shall contain 2,000 gallons of water in a 3,000-gallon tank for partial systems and for complete building systems shall contain 3,000 gallons of water in a 4,500-gallon tank.(3) If an adequate water supply from a community system to supply a sprinkler system does not exist and if the total gross area to be protected is more than 20,000 square feet, then the water supply shall be furnished by a gravity tank which has not less than a 30,000-gallon capacity and which is constructed as specified in the 1971 edition of national fire protection association pamphlet no. 22, standard for water tanks for private fire protection, which is adopted by reference in R 400.18659.(4) Complete shop drawings shall be submitted to the appropriate inspecting authority for approval before the installation of sprinklers.(5) A sprinkler system shall be equipped with a flow alarm that is electrically relayed to the fire alarm system of the building, except for sprinklers that are installed in accordance with the provisions of subrule (6) of this rule.(6) The sprinkler piping for any isolated hazardous area that can be adequately protected by not more than 2 sprinklers may be connected directly to the domestic water system at a point where a minimum 1-inch supply is available. An approved OS and Y valve and check valve shall be installed between the sprinklers and the connection to the domestic water supply. This method of sprinklering shall be used very conservatively.(7) A partial sprinkler system in new construction shall be designed to protect all of the following areas: (a) Heating plant rooms that house incinerators of more than a 2-bushel capacity.(d) Storage rooms for combustible material, including janitor rooms and closets.(e) Clean and dirty linen rooms.(g) Laundry and rubbish chute feed rooms.(h) The tops and various levels, where required, of laundry and rubbish chutes.(i) Kitchen storage rooms.Mich. Admin. Code R. 400.18641