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As per Indian
Standard Specifications Cranes have been basically divided into
four Classes.
Class – I Light Duty:
These are
normal maintenance cranes which are not in constant use. Cranes
for periodical maintenance of plant and machinery come under
this category. These types of cranes are required for maximum
1000 working hours per annum. Their speeds are slow and the
structures are light.
Class – II Medium Duty:
This class
perhaps covers the largest number of cranes used by the
Industry, in workshops. Foundries, Processing plants, ware
houses and infact in every area where a fair degree of activity
exists. These cranes are designed for maximum 2000 working
hours per annum.
Class – III Heavy Duty:
For workshops
and production shops where the cranes, in addition to normal
handling work, also become a part of production process by
helping production particularly in those workshops which run 2/3
shifts per day. The total working load on these cranes is about
3000 hours per annum.
Class – IV Extra Heavy Duty:
This class
includes very special cranes of highest importance in steel
industry, cement industry, storage houses and in some other
selected industries. These are for continuous duty operation.
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