Section R. 408.12619 - Hydraulic and pneumatic systemsRule 2619.
(1) A hydraulic or pneumatic system shall be designed and constructed to have a safety factor of not less than 4.(2) Hydraulic or pneumatic flexible lines shall be protected from chaffing.(3) When hydraulic, air or steam lines are bled, equipment supported by these systems shall be physically blocked or otherwise secured by means other than components in the circuit, to provide for the safety of employees working on or about the equipment.Mich. Admin. Code R. 408.12619