1. Chains (Lifting Chains)
Usage Guidelines:
Strictly prohibit overloading. Chains must not be twisted or knotted.
During lifting, chains must bear vertical loads; avoid oblique pulling (angle ≤ 120°).
For loads with sharp edges, add padding to prevent chain wear.
Maintenance & Inspection:
Lubricate chains regularly to prevent rust.
Store in a dry, ventilated area, away from corrosive substances like acids and alkalis.
Inspect for cracks, plastic deformation, or excessive wear before use (scrap if wear exceeds 10% of the original diameter).
2. Links (Connecting Links / Master Links)
Usage Guidelines:
Ensure connections are secure and bolts are fully tightened.
Strictly prohibit lateral loading (e.g., shear force on the shackle pin).
The angle between the two legs of the sling must not exceed 120°.
Maintenance & Inspection:
Check the ring body for cracks, deformation, or wear.
Clean threaded parts regularly and apply anti-rust oil.
Do not disassemble using hammering to prevent thread damage.
3. Hooks
Usage Guidelines:
Hooks must be equipped with a functional and reliable safety latch (tongue).
Repairing hooks by welding is strictly prohibited.
Ensure the load's center of gravity aligns with the hook's center to avoid eccentric loading.
Maintenance & Inspection:
Check wear on the critical section (scrap if > 5% of original dimension).
Check increase in throat opening (scrap if > 15% of original dimension).
Check for twist deformation (scrap if > 10°).
Ensure the safety latch is flexible and effective, and bearings are lubricated.
4. General Safety Requirements
Trial Lift:
Before lifting, raise the load 20-50cm off the ground and hold for 3 minutes. Inspect the rigging, load binding, and crane stability.
Environmental Requirements:
Stop outdoor lifting when wind speed exceeds Level 6 (12m/s).
Standing under suspended loads is strictly prohibited.
Mark a safety exclusion zone (radius = boom length + 5m).
Storage:
Store rigging on dedicated racks by category; avoid heavy pressure or direct contact with the ground.
Fiber slings must be protected from light, heat, and chemicals.
5. Scrapping Criteria
Chains / Wire Ropes:
Broken wires exceed standards (e.g., ≥10% broken wires within one lay length for wire ropes).
Cage distortion or core damage.
Hooks:
Cracks, excessive wear on the critical section, excessive throat opening increase, or plastic deformation.
Links / Shackles:
6. Emergency Response
In the event of rigging failure, load tilting, or other hazards during lifting, immediately stop operations, evacuate personnel, and report to the safety department. Forcible lifting or unauthorized repair of damaged rigging is strictly prohibited.
