You are lifting a 3 ton weight with a single whip rove on a swinging boom set at an angle of 60° to the horizontal. Use the formula for the size of a shackle with a safe working load and determine the minimum size shackle that should be used to secure the head block to the boom.

Question

You are lifting a 3 ton weight with a single whip rove on a swinging boom set at an angle of 60&deg; to the horizontal. Use the formula for the size of a shackle with a safe working load and determine the minimum size shackle that should be used to secure the head block to the boom.

Accepted Answer

Option B: 1 1/2 inch. At a 60-degree boom angle, the topping lift and head block loads are calculated using standard rig mechanics formulas. Applying the standard shackle SWL formula for the resulting load determines that a 1 1/2 inch shackle is required.

You are lifting a 3 ton weight with a single whip rove on a swinging boom set at an angle of 60&deg; to the horizontal. Use the formula for the size of a shackle with a safe working load and determine the minimum size shackle that should be used to secure the head block to the boom.

You are lifting a 3 ton weight with a single whip rove on a swinging boom set at an angle of 60° to the horizontal. Use the formula for the size of a shackle with a safe working load and determine the minimum size shackle that should be used to secure the head block to the boom.