Why is sling leg tension calculated?

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Multiple Choice

Why is sling leg tension calculated?

Sling leg tension is calculated to verify that each leg of the sling carries a load within its Safe Working Load. In a lift, the weight of the load and the geometry of the rigging determine how much tension each leg experiences. For a two-leg sling, the tension in each leg depends on the angle from vertical: as the legs tilt outward (angle from vertical increases), the tension per leg increases according to T = W/(2 cos theta). This means that even if the total weight seems manageable, a poor angle can push the tension on a single leg beyond what the sling is rated to handle. For example, with a 10,000 lb load and two legs at a moderate angle from vertical, each leg might carry about 5,773 lb. If the sling’s rating per leg is 6,000 lb, the lift is acceptable; if the angle is larger, the leg tension could rise past the SWL, creating a dangerous overload. That’s why you calculate sling leg tension: to ensure the load on each leg stays within the sling’s capacity and prevent failure. Dynamic factors and other considerations can affect the overall lift, but the primary reason to calculate leg tension is to keep each leg from exceeding its Safe Working Load. The other options don’t address this critical safety check.

Sling leg tension is calculated to verify that each leg of the sling carries a load within its Safe Working Load. In a lift, the weight of the load and the geometry of the rigging determine how much tension each leg experiences. For a two-leg sling, the tension in each leg depends on the angle from vertical: as the legs tilt outward (angle from vertical increases), the tension per leg increases according to T = W/(2 cos theta). This means that even if the total weight seems manageable, a poor angle can push the tension on a single leg beyond what the sling is rated to handle.

For example, with a 10,000 lb load and two legs at a moderate angle from vertical, each leg might carry about 5,773 lb. If the sling’s rating per leg is 6,000 lb, the lift is acceptable; if the angle is larger, the leg tension could rise past the SWL, creating a dangerous overload. That’s why you calculate sling leg tension: to ensure the load on each leg stays within the sling’s capacity and prevent failure.

Dynamic factors and other considerations can affect the overall lift, but the primary reason to calculate leg tension is to keep each leg from exceeding its Safe Working Load. The other options don’t address this critical safety check.

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