CMAA CLASS

CLASS TITLE

DESCRIPTION     

A

Standby or Infrequent Use

This service class covers cranes which may be used  in installations such as power houses, public utilities, turbine rooms, motor rooms and transformer stations 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.

B

Light Service

This service covers cranes which may be used in repair shops, light assembly operations, service buildings, light warehousing, etc. where service requirements are light and the speed is slow.  Loads may vary from no load to occasional full rated loads with two to five lifts per hour, averaging ten feet per lift.

C

Moderate Service

This service covers cranes which may be used in machine shops or paper mill machine rooms, etc., where service requirements are moderate.  In this type of service the crane will handle loads which average 50 percent of the rated capacity with 5 to 10 lifts per hour, averaging 15 feet, not over 50% of the lift at rated capacity.

D

Heavy Service

This service covers cranes whicy may be 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.  In this type of service, loads approaching 50% 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, not over 65% of the lifts at rated capacity.

E

Severe Service

This type of service requires a crane capable of handling loads approaching a rated capacity throughout its life.  Applications may include magnet, bucket, magnet/bucket combinations for scrap yards, cement mills, lumber mills, fertilizer plants, container handling, etc., with 20 or more lifts per hour at or near the rated capacity.

F

Continuous Severe Service

This type of service requires a crane capable of handling loads approaching rated capacity continuously under severe service conditions throughout its life.  Applications may include custom designed speciality cranes essential to performing the critical work tasks affecting the total production facility.  These cranes must provide the highest reliability with special attention to ease maintenance features.