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Definitions

 

crane, standby

load


Fig. 5  Wall Crane
 


crane, standby: a crane not in regular service that is used occasionally or intermittently as required.

crane, wall: a crane having a cantilever frame with or without trolley, and supported from a side wall or line of columns of a building. It is a traveling type and operates on a
runway attached to the side wall or columns (see Fig. 5).

crane service, heavy: service that involves operating at 85 to 100% of rated load or in
excess of 10 lift cycles/hr as a regular specified procedure.

crane service, normal: service that involves operating at less than 85% of rated load
and not more than 10 lift cycles/hr except for isolated instances.

crane service, severe: service that involves normal or heavy service with abnormal operating conditions.

designated person: a person selected or assigned by the employer or the employer's representative as being competent to perform specific duties.

drift point: a point on a travel motion master switch or on a manual controller that maintains the brake released while the motor is not energized. This allows for coasting.

drum: the cylindrical member around which the ropes are wound for lifting or lowering the load.

end tie: a structural member that connects the ends of the bridge girders to maintain squareness of the bridge.

equalizer: a device that compensates for unequal length or stretch of a rope. exposed: applies to hazardous objects not guarded or isolated, and capable of being contacted inadvertently.

gantry leg: the structural member that supports a bridge girder or end tie from the sill.

hazardous (classified) locations: locations where fire or explosion hazards may exist. Locations are classified depending on the properties of the flammable vapors, liquids, or gases, or combustible dusts or fibers that may be present and the likelihood that a flammable or combustible concentration or quantity is present (see National Electrical Code, ANSI/NFPA 70).

class I locations: locations in which flammable gases or vapors are or may be present in the air in quantities sufficient to produce explosive or ignitable mixtures.

class II locations: locations that are hazardous because of the presence of combustible dust.

class III locations: locations that are hazardous because of the presence of easily ignitable fibers or flyings, but in which such fibers or flyings are not likely to be in suspension in the air in quantities sufficient to produce ignitable mixtures.

hoist: a machinery unit that is used for lifting or lowering a load.

hoist motion: motion that lifts or lowers a load.

hook, latch-equipped: a type of hook with a mechanical device to close the throat opening of the hook.

lifting devices: devices that are not reeved onto the hoist ropes, such as hook-on buckets, magnets, grabs, and other supplemental devices used for ease of handling certain types of loads. The weight of these devices is to be considered part of the rated load.

limit device: a device that is operated by some part or motion of a power-driven hoist, trolley, or bridge to limit motion.

load: the total superimposed weight on the load block or hook.