Scenario: 2-Leg Lift. Sling Angle 60° from horizontal.
• Wire Slings SWL = 4 Tonnes
• Shackles SWL = 3 Tonnes (Red)
Step 1: Determine Load Factor
Angle from horizontal = 60°
RTITB Factor = 1.154
Step 2: Calculate based on Slings (4T)
Formula: (SWL ÷ Factor) × 2 Legs
(4 ÷ 1.154) × 2 = 6.94 Tonnes
Step 3: Calculate based on Shackles (3T)
Formula: (SWL ÷ Factor) × 2 Legs
(3 ÷ 1.154) × 2 = 5.20 Tonnes
Safe Working Load = 5.2 Tonnes
(The shackles are the Weakest Link!)
Scenario: 4-Leg Lift on a Rigid Load.
• Included Angle = 90°
• Sling Capacity = 3 Tonnes each
Step 1 (The Rule):
Rigid loads do not share weight evenly. We must assume the load is carried by 2 LEGS ONLY (diagonal pair).
Step 2 (Factor):
90° Included Angle (45° Horizontal) = 1.414.
Step 3 (Math):
(3.0 T ÷ 1.414) × 2 Legs = 4.24 Tonnes.
Total SWL = 4.24 Tonnes
(Even though 4 legs are attached!)