If the Working Load Limit (WLL) of the flexible wire rope is unknown, the rule of thumb formula to compute the WLL is: Diameter in mm squared x 8 = WLL in kg.
- The WLL of a 15 mm wire rope = 152 x 8 = 15 x 15 x 8 = 1800 kg
- The WLL of a 20 mm wire rope = 202 x 8 = 20 x 20 x 8 = 3200 kg.
- The WLL of a 25 mm wire rope = 252 x 8 = 25 x 25 x 8 = 5000 kg.
If the WLL of a synthetic fibre rope is unknown, the formula for determining the WLL is: Diameter in mm squared = the WLL in kg.
- The WLL of a 12 mm fibre rope is: 122 = 12 x 12 = 144 kg.
- The WLL of a 15 mm fiber rope is: 152 = 15 x 15 = 225 kg.
- The WLL of a 20 mm fiber rope is: 202 = 20 x 20 = 400 kg.
- Store in a clean, dry and well ventilated place.
- Never store on the ground or floor.
- Store out of direct sunlight, ultraviolet light or fluorescent lighting.
- Store away from chemicals.
- Store away from oils.
- Store away from sand/grit.
- Store away from machinery.
- Store in a vermin free environment.
Synthetic webbing slings must be removed from service when any of the following substandard conditions exitst:
- Label or tag has been removed and/or destroyed or not legible.
- Knots, snags, holes, tears or cuts.
- Damage to sleeve.
- Evidence of external wear or excessive abrasions.
- Evidence of internal wear.
- Melting or charring of any part of the sling surface.
- Any signs of damage by temperatures, sunlight or chemicals.
- Damage to the eyes, corrosion discoloration or other damage to end fittings or terminal attachments.
- Signs of contact with acids for nylon slings or signs of contact with organic solvents for polyster slings.
- Broken or worn stitches.
Lifting hooks must be discarded and removed from service if any of the following unsafe conditions are observed during the regular and pre-use inspection:
- Missing or illegible manufacturer identification.
- Any cracks, nicks and gouges.
- Damage from heat.
- Any unauthorized repair done on the hook.
- Any twist from the plane of the unbent hook.
- Improper operation and locking of self-locking hook.
- Any wear exceeding 10% of the original dimension.
- An increase of the throat opening by 5% due to wear or distortion.
Shackles must be discarded and removed from service immediately if the following unsafe conditions are observed during regular or pre-use inspection:
- Excessive pitting or corrosion.
- A 10% or more reduction from the original dimension at any point around the body or pin.
- Damage on the shackle body including: bent, twisted, distorted, stretched, elongated, cracked, or broken load-bearing
- Excessive nicks or gouges.
- Indication of heat damage (weld splatter, arc strike, etc.)
- Incomplete pin engagement.
- Excessive thread damage.
- Evidence of unathorized repair or welding.
Lifts utilizing cranes, hoists, or other mechanical lifting devices will not commence unless:
- An assessment of the lift has been completed and the lift method and equipment have been determined by ancompetent person(s);
- Operators of powered lifting devices are trained and certified for that equipment;
- Rigging of the load is carried out by a competent person(s);
- Lifting devices and equipment have been certified for use within the last 12 months (at a minimum);
- Load does not exceed dynamic and/or static capacities of the lifting equipment;
- Any safety devices installed on lifting equipment are operational.;
- All lifting devices and equipment have been visually examined before each lift by a competent person(s).
During fibre rope inspection, condemn the fibre rope from safe use for lifting purposes if any of the following is observed during inspection:
- Strands are fraying
- Strands are cut
- Rope rotted by acid or alkali
- Rope affected by heat or sun
- Rope affected by molds
- Rope has been overloaded
- Rope chafed inside or outside
- Unlaid stands
- Knotted rope