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Standard For Crane Boom Lifting Capacities

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Author : Eric Wang
Update time : 2021-07-12 11:25:48
Standard For Crane Boom Lifting Capacities
1. Operating radius is the horizontal distance from centerline of rotation to a vertical line through the center of gravity the load.
2. Rated loads do not exceed 75% of tipping load. Deduct weight of hook block(s), slings and all other load          handling accessories from main boom or auxiliary sheave rated loads shown.
3. Rated loads shown are based on freely suspended loads and make no allowance for such factors as wind effect on lifted load, ground conditions out-of-level. Operating speeds or any other condition that could be detrimental to the safe operation of this equipment, the operator, therefore, has the responsibility to judge the existing conditions and reduce lifted loads and operating speeds accordingly.

4. At radii and boom lengths where no ratings are shown on chart, operation is not intended or approved.
5. Ratings surrounded by thick lines in the charts are determined by the machine’s structural strength, and others are determined by the machine’s stability.
6. Gantry must be in raised position for all conditions.
7. Boom inserts and guy lines must be arranged as shown in the “Boom Arrangement”.
8. Main Boom Rated Loads
Deduct weight of main hook block, slings and all other load handling accessories from main boom rated loads shown.

9. Auxiliary Sheave Rated Loads
Deduct weight of auxiliary ball hook, slings and all other load handling accessories from auxiliary sheave rated loads shown.
10.Jib Rated Loads
Deduct weight of jib hook block, slings and all other load handling accessories from jib rated loads shown.
11. An auxiliary sheave can be fitted to boom in following table.
12. Boom hoist reeving must be sixteen parts of line.
13. In principle, the boom should be erected over the front of the crawlers.




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