You are lifting a 5-ton weight with a single whip rove on a swinging boom set at an angle of 20° 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 5-ton weight with a single whip rove on a swinging boom set at an angle of 20&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 C: 1 3/4 inch. Calculating the total load on the head block for a 5-ton lift with a 20-degree boom angle using standard derrick stress formulas dictates a high safe working load, requiring a 1 3/4 inch shackle.

You are lifting a 5-ton weight with a single whip rove on a swinging boom set at an angle of 20&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 5-ton weight with a single whip rove on a swinging boom set at an angle of 20° 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.