(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 initial installation of equipment and for
infrequent maintenance. Typical examples are cranes used in
powerhouses, public utilities, turbine rooms, motor rooms, and
transformer stations. This is the lightest crane as far as duty
cycle is concerned.
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 are cranes in repair shops, light assembly operations,
service buildings, light warehousing, etc.
covers cranes whose 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 are cranes used
in machine shops, papermill machine rooms, etc.
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 are cranes used in heavy machine
shops, foundries, fabricating plants, steel warehouses, container
lumber mills, etc., and standard duty bucket and magnet operations
where heavy duty production is required.
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 are
magnet, bucket, magnet/bucket combination cranes for scrap yards,
cement mills, lumber mills, fertilizer plants, container handling,
(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 are 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.