Section R. 408.16326 - Hydraulic and pneumatic systemsRule 6326.
(1) A hydraulic or pneumatic system shall have a designed safety factor of at least 4.(2) When hydraulic, air or steam lines are bled, equipment supported by these systems shall be blocked or otherwise secured to provide for the safety of employees working on or about the equipment.Mich. Admin. Code R. 408.16326