Sling Angle, Center of Gravity and Load Control
Control sling angle tension, center of gravity, balance, sharp edges, padding, test lift, tag lines and rotation.
How to study crane and rigging decisions
Practice like a lift supervisor: verify competent people, calculate the actual lift, protect the ground, inspect every lifting point, control the load path, stop for communication or weather failures, and document defects before the next shift inherits them.
Core concepts
Concept 1
Recalculate sling-leg tension for the actual angle, select rated gear, or change rigging geometry before lifting.
Exam cue: sling angle tension check
Concept 2
Lower the load, adjust rigging to capture the center of gravity, repeat a controlled test lift, and travel only when stable.
Exam cue: offset center of gravity
Concept 3
Install suitable edge protection or use compatible lifting gear so the sharp edge cannot cut or crush the sling.
Exam cue: sharp edge protection
Targeted study blocks
Simulation focus
Sling Angle, Center of Gravity and Load Control
Control sling angle tension, center of gravity, balance, sharp edges, padding, test lift, tag lines and rotation.
Risk pitfalls and guardrails
Treating verbal permission as written authorization.
Guardrail: Avoid verbal approval, copied readings, skipped isolation, and after-the-fact record traps.
Proceeding without recording readings, isolation, PPE, or exposure-control evidence.
Guardrail: Avoid verbal approval, copied readings, skipped isolation, and after-the-fact record traps.
Choosing a generic answer without checking state variation or the latest official notice.
Guardrail: Avoid verbal approval, copied readings, skipped isolation, and after-the-fact record traps.
Memory anchors
sling angle tension check
Recalculate sling-leg tension for the actual angle, select rated gear, or change rigging geometry before lifting.
offset center of gravity
Lower the load, adjust rigging to capture the center of gravity, repeat a controlled test lift, and travel only when stable.
sharp edge protection
Install suitable edge protection or use compatible lifting gear so the sharp edge cannot cut or crush the sling.
tagline rotation control
Lower or hold the load, attach tag lines or approved rotation controls, clear people from the path, and resume under control.
Official source check
Verify eligibility, forms, fees, validity, and safety requirements with State Factories Inspectorates / Directorate of Industrial Safety and Health / Sector skill and lifting-equipment safety authorities or the current state authority notice.
Stop-work cue
If identity, authorization, isolation, PPE, exposure limits, or emergency controls are unclear, stop work and escalate.
Record cue
Exam-safe answers protect written records, competent sign-off, instrument readings, and traceable corrections.
Shortcut trap
Fast results, verbal approval, copied certificates, and undocumented adjustments are common trap answers.
Checkpoint rule
Do the check-up only after you can summarize each concept in one sentence and identify one dangerous pitfall from memory.
Knowledge Check (after reading)
Short check-up to confirm understanding of this module.
Check-up Questions
A symmetric two-leg sling supports a 10-tonne load. Each leg is at 60° above horizontal. Using T = W ÷ (2 sin θ), what is the approximate tension in each leg?
For the same load and symmetric two-leg sling, what happens to leg tension when the sling angle above horizontal decreases from 60° to 30°?
Answer all questions to submit.
Next step personalized recommendations
Continue learning
Move forward only after this module is stable.
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