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Different Types of Overhead Crane Classifications

Determine Required Working Class

CLASS A, Standby or infrequent service
This service class covers cranes where precise handling of equipment at slow speeds with long idle periods between lifts are required. Capacity loads may be handled for the initial installation of equipment and for infrequent aintenance.
Typical examples: cranes used in powerhouses, public utilities, turbine rooms, motor rooms, and transformer stations. This is the lightest crane as far as the duty cycle is concerned.

CLASS B, Light service

This service class covers cranes where service requirements are light and the speed is slow. Loads may vary from no load to occasional full-rated loads with 2 to 5 lifts per hour, averaging 10 feet per lift.

Typical examples: cranes in repair shops, light assembly operations, service buildings, light warehousing, etc.

CLASS C, Moderate service
This service class covers cranes where service requirements are deemed moderate, handling loads which average 50 percent of the rated capacity with 5 to 10 lifts per hour, averaging 15 feet, with not over 50 percent of the lifts at rated capacity.
Typical examples: cranes used in machine shops, paper mill machine rooms, etc.
 

CLASS D, Heavy service
In this type of service, loads approaching 50 percent of the rated capacity will be handled constantly during the work period. High speeds are desirable for this type of service with 10 to 20 lifts per hour averaging 15 feet, with not over 65 percent of the lifts at rated capacity. 

Typical examples: cranes used in heavy machine shops, foundries, fabricating plants, steel warehouses, container yards, lumber mills, etc., and standard duty bucket and magnet operations where heavy-duty production is required

CLASS E, Severe service
This type of service requires a crane capable of handling loads approaching the rated capacity throughout its life with 20 or more lifts per hour at or near the rated capacity.
Typical examples: magnet, bucket, magnet/bucket combination cranes for scrap yards, cement mills, lumber mills, fertilizer plants, container handling, etc.

CLASS F, Continuous severe service

In this type of service, the crane must be capable of handling loads, approaching rated capacity continuously under severe service conditions throughout its life.
Typical examples: custom-designed specialty cranes essential to performing the critical work tasks affecting the total production facility, providing the highest reliability with special attention to ease of maintenance features.

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