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- Master & Chief Mate (Oceans or Near Coastal (Offshore Supply Vessel)) »
- Q200 - Deck General
136. 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.
The effective load at the boom head is calculated as 6 tons due to the 60-degree boom angle. Using the shackle safe working load formula SWL = 3d2, a minimum shackle diameter of approximately 1.41 inches is required, necessitating a standard size of 1 1/2 inches to ensure adequate safety.
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