1. What is the Sling Lifting Capacity Formula?

The Sling Lifting Capacity formula calculates the maximum safe working load for sling configurations. It considers the tension in each leg, the number of legs, and the angle at which the sling is used.

2. How Does the Calculator Work?

The calculator uses the Sling Lifting Capacity formula:

Where:

• \( W \) — Lifting capacity (N or lb)
• \( T \) — Tension in each leg (N or lb)
• \( n \) — Number of legs (integer)
• \( \alpha \) — Angle between sling leg and vertical (degrees)

Explanation: The formula accounts for the reduction in lifting capacity as the sling angle increases from vertical.

3. Importance of Sling Lifting Capacity Calculation

Details: Accurate lifting capacity calculation is crucial for safe rigging operations, preventing equipment failure, and ensuring workplace safety.

4. Using the Calculator

Tips: Enter tension in N or lb, number of legs as integer, and angle in degrees. All values must be valid (tension > 0, legs ≥ 1, angle between 0-90°).

5. Frequently Asked Questions (FAQ)

Q1: Why does the angle affect lifting capacity?
A: As the angle increases from vertical, the horizontal component of force increases, reducing the effective vertical lifting capacity.

Q2: What is the optimal sling angle?
A: The optimal angle is typically 60° or less. Angles greater than 60° significantly reduce lifting capacity.

Q3: How does the number of legs affect capacity?
A: More legs distribute the load but also increase complexity. The capacity increases proportionally with the number of legs.

Q4: What safety factors should be applied?
A: Industry standards typically recommend a safety factor of 5:1 for personnel lifting and 3:1 for equipment lifting.

Q5: Are there limitations to this formula?
A: This formula assumes equal tension in all legs and doesn't account for dynamic loads, sling material limitations, or attachment point strength.