Basic Priciples of Cranes – Module ID 21102

Basic Priciples of Cranes – Module ID 21102


Module Eleven (21102-18) focuses on the types of mobile cranes and their common components. A fundamental understanding of crane types and how they move from place to place is important to riggers and signal persons as well as to crane operators. Cranes also have different types of lifting booms, each of which has its own strengths and weaknesses. This module presents specific features of various cranes and booms, and introduces the basic principles of lifting and leverage.

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Learning Objective 1 – Identify and describe various types of cranes and crane components.

  • Identify and describe mobile cranes based on their means of travel.
  • Identify and describe various types of crane boom types.
  • Identify and describe common crane attachments and accessories.
  • Describe common crane instrumentation and safety devices.
  • Identify and describe various crane reeving patterns.

Learning Objective 2 – Identify factors related to lifting capacity and explain their significance.

  • Explain the significance of ground conditions and a level surface.
  • Describe the bearing surface and explain how to determine the required blocking.
  • Define and describe the significance of the center of gravity and the quadrants of operation.
  • Describe the significance of boom length, angle, operating radius, and elevation.
  • Explain how to use a load chart and understand the basic concepts of critical lifts

Performance Tasks

Performance Task 1 (Learning Objective 2) – Verify the boom length of a telescopic- and/or lattice-boom crane using manufacturer’s data or a measuring tape.

Performance Task 2 (Learning Objective 2) – Measure the operating radius of a telescopic- and/or lattice-boom crane using a measuring tape.

Performance Task 3 (Learning Objective 2) – Calculate the amount of blocking needed for the outrigger of a specific crane.

Performance Task 4 (Learning Objective 2) – Verify that a crane is level.

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