Section R. 408.14523 - Hydraulic and pneumatic systemsRule 4523.
(1) Flexible and rigid hydraulic and pneumatic piping and its component parts shall have a designed safety factor of not less than 4 and shall be maintained to prevent leaks that constitute a hazard.(2) A hydraulic pressure relief valve shall be provided on each separate system and set to open at a pressure of not more than 10% above the maximum operating pressure. The discharge of the valve shall not create a hazard for the employee. A die casting machine shall not be operated with the pressure relief valve removed.(3) Fire resistant fluid shall be used in equipment where failure of a hydraulic system could cause ignition of the fluid by molten metal or flame.(4) Hydraulic and pneumatic lines shall be protected from damage due to chafing or pinching.Mich. Admin. Code R. 408.14523