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Selection of Cranes
Selection of Cranes: The Appointed person is responsible for the selection of the most appropriate crane to safely perform the lifting operation. In selecting the crane the following points need to be considered:
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Mass, dimension and characteristics of the load
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Operational speeds, radii, height of lift and area of movement
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Number, frequency and type of lift
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Length of time crane is required
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Site, ground and environmental conditions
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Restrictions arising from existing buildings
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Space available for crane access, erection and traveling
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Any other special requirements or limitations
General Safety: In addition to the specific requirements above BS7121 lays down general safety requirements for lifting operations. These include:
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Wind loading
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Identification of persons directing the crane
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PPE
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Access and emergency escape
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Fire extinguishers
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Limiting devices on the crane
Crane Documentation: The Appointed Person or his nominee is responsible for the checking of the required documentation carried by the crane operator. This would include:
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Rated capacity charts
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Instruction manuals
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Reports of Thorough Examination
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Test Certificates for the crane, ropes, and any equipment used in the lifting operation
Siting of Cranes: The Appointed Person is responsible for the Berthing Study or the siting of the crane, as an integral part of the Method Statement. The siting must take account of:
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Where the crane will stand and the ground conditions under the crane, its dead weight, the weight of the load and dynamic forces that will occur during lifting
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Any excavations in the vicinity of the lifting operation
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The effect of wind on the site
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Adequacy of access for erection and dismantling as well as the operation of the crane
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Proximity hazards such as buildings , vehicles, railway lines and overhead cables
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Recommended clearances
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Underground hazards such as drains and voids
Please Note: The above summary is for guidance only and should not be taken as comprehensive. Any person organizing a lifting operation must make themselves fully aware of all the requirements of BS7121.