Michigan Administrative Code
Department - Labor and Economic Opportunity
MIOSHA
General Industry and Construction Safety and Occupational Health Standards
General Industry Safety Standards
Part 18 - OVERHEAD AND GANTRY CRANES
CONSTRUCTION, INSTALLATION AND EQUIPMENT
Section R. 408.11833 - Bridge bumpers; trolley bumpers; rail sweeps

(1) A crane shall be provided with bumpers or other automatic means providing equivalent effect, unless the crane travels at a slow rate of speed and has a faster deceleration rate due to the use of sleeve bearings, is not operated near the ends of bridge and trolley travel, is restricted to a limited distance by the nature of the crane operation and there is no hazard of striking any object in the limited distance, or is used in similar operating conditions. The bumpers shall be capable of stopping the crane, not including the lifted load, at an average rate of deceleration of not more than 3 feet/s/s (per second, per second) when traveling in either direction at 20% of the rated load speed. Bumpers shall meet both of the following requirements:

(2) Bumpers shall be designed and installed to minimize parts falling from the crane in case of breakage.

(3) A trolley shall be provided with bumpers or other automatic means of equivalent effect, unless the trolley travels at a slow rate of speed, is not operated near the ends of bridge and trolley travel, is restricted to a limited distance of the runway and there is no hazard of striking any object in the limited distance, or is used in similar operating conditions. The bumpers shall be capable of stopping the trolley, not including the lifted load, at an average rate of deceleration of not more than 4.7 feet/s/s (per second, per second) when traveling in either direction at 1/3 of the rated load speed. Trolley bumpers shall meet both of the following requirements:

(4) Bridge trucks shall be equipped with rail sweeps that extend below the top of the rail and project in front of the truck wheels.