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Sling Angle Factor Formula:
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The Sling Angle Factor is a dimensionless factor used in rigging and lifting operations to account for the increased tension in slings when they are used at an angle to the horizontal. It helps determine the actual load on each leg of a sling system.
The calculator uses the sling angle factor formula:
Where:
Explanation: As the angle decreases from 90° (vertical) to smaller angles, the tension in each sling leg increases significantly, which is quantified by this factor.
Details: Proper calculation of sling angle factor is crucial for safe lifting operations. It ensures that slings are not overloaded and helps determine the appropriate sling capacity needed for a specific lifting configuration.
Tips: Enter the angle between the sling leg and horizontal plane in degrees. The angle must be between 0° and 90° (exclusive). The calculator will compute the corresponding sling angle factor.
Q1: Why does the sling angle affect tension?
A: When slings are used at an angle, the vertical component of the tension must support the load, requiring higher total tension in each sling leg.
Q2: What is the factor at 90 degrees?
A: At 90° (vertical), the factor is 1.0, meaning each sling leg carries exactly its share of the load.
Q3: What happens at very small angles?
A: At small angles, the factor becomes very large, indicating extremely high tensions in the sling legs that can exceed safe working limits.
Q4: Are there minimum angle recommendations?
A: Most safety standards recommend maintaining sling angles of 30° or greater to avoid excessive tension factors.
Q5: How does this affect sling selection?
A: The calculated factor must be multiplied by the share of load per leg to determine the actual tension, which must not exceed the sling's rated capacity.