Factors affect crane duty classification

To select the suitable crane duty class or service class for your crane is very important for it will affect your initial investment and your future maintenance cost required. How to select the crane duty classification for your overhead crane? The following factors should be considered:

• Rated Load – Estimation of the loads lifted at or near capacity
• Service – Total hours in operation per day
• Number of Lifts – Average lifts and trolley and bridge movements made each hour
• Distance – Average length of each movement

Other factors

The following factors do not affect the overhead crane classification directly , but they may affect the crane designing and specifying, which also should be noted.

• 速度 – how quickly can the lifting crane transfer materials or equipment? How many lifts per hour can the lifting overhead crane perform?
• Maintenance requirements – will the lifting crane need to be serviced regularly and how will maintenance or repair affect production and downtime?
• 動作環境 – In what type of environment or conditions will the overhead bridge crane be operating?
• Future needs – Any changes or increases in production requirements down the road? If you design a Class C crane, but know that down the road you be lifting heavier loads or using your crane more frequently, you may need to consider a Class D range crane.

For different countries, the crane duty classifications may vary however they are basicly the same. In the following, the Crane duty classifications from China and 米国 is presented for your reference.

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