Who must be present for the pre-lift discussion when using voice signals according to ASME B30.5?

The requirement for the presence of the lift director, signalman, and operator during the pre-lift discussion is crucial for ensuring safety and clarity in the lifting operation. This trio represents all key roles involved in the lift: the lift director oversees the entire operation, the signalman communicates between the operator and the other crew members, and the operator controls the lifting equipment. By having all three present for the discussion, each can contribute their expertise and perspective, providing a comprehensive understanding of the lift plan, addressing any concerns about the lift environment, and clarifying the signals to be used during the operation.

The collaboration among these individuals during the pre-lift discussion helps to create a shared understanding of the lift's objectives, potential challenges, and safety precautions. Such communication is essential in preventing misunderstandings that could lead to accidents or injuries on-site.