How to choose the crane working class?

Typical Installation

Shift

Typical Workload

Key Points

Class A Standby or Infrequent Service

Power Houses Public Utilites Turbine Rooms Motor Rooms

Transformer Stations

0 - 2

Single Shift

Operation

· Precise handling at slow speeds with idle periods between lifts

· Capacity loads may be handled for initial installation of equipment and for infrequent maintenance

· Maintenance crane in machine house

· Used only occasionally

Class B Light Service

Repair Shops Light Assembly Operations

Light Warehousing

2 - 5

Single Shift

Operation

· Loads vary from no load to occasional full rated loads

· Light service requirements

· Slow speed

Class C Moderate Service

Machine Shops Paper Mills Machine Rooms

5 - 10

Single Shift

Operation

· Average load is 50% of rated load

· 50% of less of the lifts are at the rated capacity

· Minimum 1.15 service factor on bridge motion

Class D Heavy Service

Heavy Machine Shops Foundries Fabricating Plants Steel Warehouses Container Yards Lumber Mills

Stanadard Duty Bucket & Magnet Operations

10 - 20

1 - 2 Shift

Operation

· Average  loads  approaching  50%  are continuously handled

· 50% of less of the lifts are at the rated capacity

· Minimum 1.3 service factor on bridge motion

· Lift the maximum capacity with 30%

frequency

· Typically faster speeds over Class C

· Hoist   is   typically   used   in   this   type   of application and is tailored towards a specific application with a heavy duty cycle to handle demanding needs.

Class E Severe Service

Magnet

Bucket Magnet/Bucket Combo Scrap Yards

Cement Mills Lumber Mills Fertilizer Plans Container Handling

20+

24/7

Continuously

· Continuous use at/or near capacity

· Minimum 1.75 service factor on bridge motion

· Continuously lifts at the maximum capacity

· Typically faster speeds over Class C and D

· Hoist   is   typically   used   in   this   type   of application and is tailored towards a specific application with a heavy duty cycle to handle demanding needs.