Eye Bolts and Hoist Rings
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Questions and Answers

What is the sling tension on each leg in a two leg vertical hitch when the total load is 10,000 lbs?

  • 20,000 lbs
  • 15,000 lbs
  • 10,000 lbs
  • 5,000 lbs (correct)

    • What happens to sling tension as the angle θ in a two leg bridle hitch decreases?

  • Sling tension decreases
  • Sling tension increases (correct)
  • Sling tension remains constant
  • Sling tension becomes negligible

    • At what angle does the sling tension equal the total load of 10,000 lbs in a two leg bridle hitch?

  • 30° (correct)
  • 60°
  • 10°
  • 45°

    • What is the sling tension for each leg at a 10° angle in a bridle hitch with a total load of 10,000 lbs?

    <p>28,800 lbs</p> Signup and view all the answers

    What type of hooks are generally used at LLE for overhead cranes?

    <p>Shank hooks with latches</p> Signup and view all the answers

    What is the total sling tension in a two leg bridle hitch at a 45° angle with a total load of 10,000 lbs?

    <p>7,070 lbs</p> Signup and view all the answers

    Which hook type is permissible for point loading?

    <p>Sorting hook</p> Signup and view all the answers

    At an angle of 60°, what is the sling tension on each leg in a two leg bridle hitch?

    <p>5,775 lbs</p> Signup and view all the answers

    Which of the following is NOT a requirement when using a load hook?

    <p>Use a latch that is distorted or bent</p> Signup and view all the answers

    What is the purpose of the latch on a hook?

    <p>To retain loose sling or devices under slack conditions</p> Signup and view all the answers

    Which of the following tensions occurs at a 30° angle in a two leg bridle hitch with a total load of 10,000 lbs?

    <p>10,000 lbs per leg</p> Signup and view all the answers

    If the total load is 10,000 lbs, what is the sling tension on each leg at a 60° angle?

    <p>5,775 lbs</p> Signup and view all the answers

    Which of the following statements is true regarding the loading of hooks?

    <p>Hooks must only be loaded in-line</p> Signup and view all the answers

    When should additional hooks be used in rigging situations at LLE?

    <p>When specifically requested from management</p> Signup and view all the answers

    Which of these is an indicator of excessive wear in a hook?

    <p>Visible deformation or bending of the hook</p> Signup and view all the answers

    What is a significant risk when using old or unknown rigging hardware?

    <p>They may not be identifiable and legible</p> Signup and view all the answers

    What factor does NOT affect the load rating of a hoist ring?

    <p>Environmental conditions</p> Signup and view all the answers

    Which of the following best describes the movement capability of hoist rings?

    <p>Free movement about two axes</p> Signup and view all the answers

    What should be checked to ensure a hoist ring is safe to use?

    <p>Condition of the swivel and bail</p> Signup and view all the answers

    Which component is commonly used alongside hoist rings in rigging?

    <p>Eyebolts</p> Signup and view all the answers

    What material is a hoist ring commonly made from?

    <p>Alloy steel or stainless steel</p> Signup and view all the answers

    When using a hoist ring on aluminum, what should be considered about the thread projection?

    <p>It must be twice the thread diameter</p> Signup and view all the answers

    What is a necessary requirement for each hoist ring before it can be used?

    <p>It must be load tested with a factory certificate</p> Signup and view all the answers

    What characteristic of hoist rings allows them to handle various angles of use?

    <p>Swivel capability</p> Signup and view all the answers

    What is one reason reeving slings between attachment points should be avoided?

    <p>It introduces side pull forces.</p> Signup and view all the answers

    What is essential before using an eye bolt for rigging?

    <p>It must have clear identification marks.</p> Signup and view all the answers

    What is the maximum side pull angle that should be used with shouldered eye bolts from Crosby?

    <p>90°</p> Signup and view all the answers

    Which of the following characteristics do eyebolts from different manufacturers NOT share?

    <p>The same working load limits (WLL).</p> Signup and view all the answers

    What does a resultant sling angle of 1.73 lbf indicate about the forces acting on the eye bolt at a 60° upper sling angle?

    <p>The lateral load equals the vertical load.</p> Signup and view all the answers

    When using a shouldered eye bolt, how much should the side pull be limited to for safe operation according to Chicago's ratings?

    <p>45° angle only</p> Signup and view all the answers

    What is the primary reason for users to look up WLL information before using an eye bolt?

    <p>The WLL can vary per manufacturer.</p> Signup and view all the answers

    Which statement about flat washers under the shoulder of an eye bolt is correct?

    <p>They can be used to position the plane of the eye.</p> Signup and view all the answers

    Which of the following is NOT a characteristic of shouldered eye bolts?

    <p>They are identical across all manufacturers.</p> Signup and view all the answers

    To maintain safe rigging practices, what should be prioritized when selecting an eye bolt?

    <p>The clarity of the manufacturer’s markings.</p> Signup and view all the answers

    What should be done if the installation placard is missing from a hoist ring?

    <p>Remove the hoist ring from service.</p> Signup and view all the answers

    What is the appropriate thread engagement when threading into steel?

    <p>One times the diameter.</p> Signup and view all the answers

    Which tool is necessary for final tightening of the hoist ring after initial installation?

    <p>Torque wrench.</p> Signup and view all the answers

    What should be verified after installing a hoist ring?

    <p>Swivel and bail functionality.</p> Signup and view all the answers

    Which of the following is NOT a do while using hoist rings?

    <p>Use washers between the hoist ring and the mounting surface.</p> Signup and view all the answers

    What action should be taken if a hoist ring does not swivel?

    <p>Remove it from service.</p> Signup and view all the answers

    What is the consequence of exceeding the load rating of a hoist ring?

    <p>Potential breakage or failure.</p> Signup and view all the answers

    How should a hoist ring be tested for damage?

    <p>By visually inspecting for corrosion and damage.</p> Signup and view all the answers

    Which of the following statements is correct regarding the installation of hoist rings?

    <p>A torque wrench must be used for final tightening.</p> Signup and view all the answers

    What should you do if there is a gap between the hoist ring and the part being lifted?

    <p>Remove the hoist ring from service.</p> Signup and view all the answers

    Study Notes

    ### Eye Bolts 

    • Do not use flat washers under the shoulder to position the plane of the eye
    • Do not reeve slings between attachment points
    • Eye bolts must have legible identification marks
    • There are different manufacturers of eye bolts that have different working load limits (WLL) for the same size of bolt
    • The Working Load Limit (WLL) and installation torque for eye bolts must be confirmed before they are used

    Hoist Rings

    • Hoist rings have free movement about two axes which allows them to always be aligned with the sling
    • Do not use a hoist ring if the swivel or bail bind
    • Hoist rings are load tested and come with a factory certificate
    • Hoist rings are made from alloy steel or stainless steel
    • The "Effective Thread Projection" must be at least twice the thread diameter when threading into aluminum
    • Hoist ring load ratings and installation torque values are stamped on a placard attached to the hoist ring
    • Visually inspect hoist rings for damage or corrosion on threads and body before using
    • Ensure the installation placard is attached to the hoist ring
    • Use an Allen wrench for initial installation and then a torque wrench for final tightening
    • Make sure the thread engagement is appropriate for the base metal the bolt is being threaded into
    • Verify swivel and bail functionality after installation
    • Do not use hoist rings that are damaged or missing the placard
    • Do not use hoist rings that are not tightened to the recommended torque
    • Do not use hoist rings that do not swivel
    • Do not use washers between the hoist ring and mounting surface
    • Do not repair, replace, or modify any piece of a hoist ring
    • Do not use a hook larger than the diameter of the hoist ring bail opening
    • Never exceed the load rating of the hoist ring

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    Description

    Test your knowledge on the proper usage and safety guidelines for eye bolts and hoist rings. Understand the critical factors like load limits, installation, and potential hazards. This quiz will cover essential details necessary for safe rigging practices.

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