📝 Exercises 2: Advanced Calculations

1. Four Slings at 45° (Equalized)
FLEXIBLE LOAD 90° Included (45° from Horizontal) 4 Slings SWL 3T
Scenario: 4 Slings lifting a load.
• Each Sling SWL = 3 Tonnes
• Angle from Horizontal = 45° (Factor 1.414)
• Assumption: Load is equalized (all legs share load).
Step 1: Identify Formula
Max Load = (SWL of 1 sling ÷ Load Factor) × Number of slings
Step 2: Calculate per Sling
3 Tonnes ÷ 1.414 (Factor for 45°) = 2.12 Tonnes vertical capacity per leg.
Step 3: Total Capacity
2.12 T × 4 Legs = 8.48 Tonnes.
Max Safe Load ≈ 8.5 Tonnes
2. Spreader Beam (Vertical vs Angled)
SPREADER BEAM 90° Included LOAD: 60T ? Tension
Goal: Find the Minimum Sling Rating (SWL) required for the Red Top Slings.
Step 1: Load Share
60 Tonnes Total ÷ 2 Sides = 30 Tonnes vertical load per side.
Step 2: Apply Factor
Top Angle = 90° Included.
Factor = 1.414.
Step 3: Calculate Tension
30 T (Share) × 1.414 (Factor) = 42.42 Tonnes.
Min Sling SWL = 42.5 Tonnes