Mich. Comp. Laws § 408.1014c
Pipes or piping systems in a workplace that contain a hazardous chemical shall be identified to an employee by a label or by a sign, placard, written operating instructions, process sheet, batch ticket, or a substance identification system that conveys the same information required to be displayed on a label by the standard incorporated by reference in section 14a. The employer shall provide at least 1 label, sign, placard, set of written operating instructions, process sheet, batch ticket, or a substance identification system selected by the employer and readily accessible to each employee at a location in the workplace designated by the employer. The employer shall establish a pipe and stationary process container entry procedure that will assure that the information required by 29 C.F.R. 1910.1200(f) is conveyed to an employee before entry. The requirements of this subsection shall apply in addition to the occupational safety and health hazard communication standard incorporated by reference in section 14a.
MCL 408.1014c