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How to choose the crane working class

2016-6-22

Before purchasing a crane, you need to know what kind of crane working class is more suitable for your workshop or plant. With proper design and crane working class, the performance of your plant will make its best and energy consumption will be the lowest level.  How to achieve the balance between cost and production? We have a simple table to tell you what kind of crane you may need.

 

Crane

Classification

 

 

# Lifts per/hr.

 

 

 

 

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.


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