Section R. 408.10925 - Inspection and maintenanceRule 925.
(1) A sprinkler shall not be painted or coated except by the sprinkler manufacturer. Excepted are petroleum jelly or paper bag coverings, which shall not interfere with the normal functioning of the sprinkler.(2) An automatic sprinkler shall be replaced with a new sprinkler after it is installed 50 years or shows evidence of corrosion, leakage, or damage.(3) A sprinkler wrench shall be used for installing and removing a sprinkler.(4) A broken or loose pipe hanger shall be replaced or refastened.(5) The employer shall perform a main drain flow test on each system annually. The inspectors test valve shall be opened not less than every 2 years to assure the system operates properly.Mich. Admin. Code R. 408.10925
1979 AC; 1984 AACS; 2013 AACS