During the disassembly of a long boom, which boom connection pins should be removed next after the pendant lines are connected at the maximum cantilever point?

When disassembling a long boom, particularly after connecting the pendant lines at the maximum cantilever point, it is crucial to prioritize safety and structural integrity. Removing the bottom pins ahead of the cantilever point is the correct action because it ensures the stability of the boom during the disassembly process.

The reason for this approach lies in the mechanics of load distribution. By removing the lower connection points first, you prevent any undue stress on the structure that could occur if pins further up are removed without securing the lower ones. This helps maintain the boom's configuration and minimizes the risk of collapse or unpredictable movements during the disassembly.

Also, it is advisable to secure the cantilevered section adequately before proceeding, as this method allows for controlled disassembly while keeping the pivot and load points stable. In contrast, removing other pins could lead to destabilization, making the boom more challenging to manage during the disassembly process. This understanding is essential for anyone involved in crane operations and disassembly to ensure compliance with safety protocols and effective operational procedures.