6.3 Textile Sling Inspection, Chemical & Mechanical Damage

Textile Sling Inspection and Damage

Textile slings are light and flexible, but their load-bearing fibres can be damaged by a small cut, heat source or chemical exposure. Inspection is therefore a positive decision about identity, material, condition and configuration—not a search for one universal percentage.

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Identity First

A usable sling needs legible identification that can be matched to its WLL, material, length, manufacturer and traceability. Body colour and capacity stripes can support recognition within an applicable standard, but they do not restore a missing label.

If identity is missing or illegible, withdraw and quarantine the sling. It may return only through an authorised traceability and marking process. Otherwise use controlled disposal so it cannot be mistaken for serviceable equipment. Do not write a guessed WLL on the webbing.

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Flat-web Sling Check

Inspect both faces, both selvages, eyes, protective sleeves and load-bearing stitching. Bend the sling gently to open the weave and use good light. Look for:

• edge cuts, transverse cuts, punctures and torn yarns;
• local abrasion, thinning, fuzzing or exposed load-bearing yarn;
• broken, loose or abraded stitching;
• eye wear, distortion and damage at fittings;
• hard glossy areas, melting, charring or weld spatter;
• chemical staining, swelling, brittleness or surface powder;
• knots, paint, embedded particles and unauthorised repair; and
• label damage or mismatch with the sling.

A “cut greater than 10% of width” is not a universal permission to use every smaller cut. A short edge cut can sever many longitudinal yarns and be critical. Apply the manufacturer or applicable standard's discard criterion; where the effect is uncertain, withdraw for competent assessment.

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Roundsling Check

The protective cover hides the endless core. Inspect and feel the entire sling for cover cuts, holes, stitching failure, hard spots, lumps, gaps, local thinning or uneven core distribution. Visible or suspected core yarn damage requires withdrawal. Do not open the sleeve as an improvised field inspection or tape over a cut.

A damaged protective sleeve fitted over a separate sling also needs assessment: the sleeve may have absorbed the contact, or the edge may have reached the sling beneath it. Remove only as the product instructions allow and inspect the load-bearing body.

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Chemical Compatibility

Fibre families react differently. Polyester is generally vulnerable to strong alkalis; polyamide is generally vulnerable to acids; polypropylene has its own solvent, heat and UV limits. Concentration, temperature and exposure time matter, so simple “resistant” tables are screening tools rather than approval.

If a polyester sling falls into concentrated caustic solution, remove it from service, isolate it and obtain manufacturer advice. Do not assume that rinsing restores strength. Unknown contamination is treated the same way because invisible molecular damage can exist before obvious surface change.

Use only approved cleaning methods. Aggressive solvents, pressure washing and high-temperature drying can damage fibres or erase markings.

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Heat, Friction and UV

Synthetic fibres can glaze or melt through friction even when ambient air is cool. Weld spatter produces local holes and hard fused areas. A hot load can conduct heat through edge protection, and dark surfaces exposed to sunlight can become hotter than air temperature.

Apply the temperature range for the exact sling material and construction. Common polyester products may publish ranges around -40°C to 100°C, but the manufacturer limit controls. Heat exposure beyond the allowed range or any melting, charring or fused yarn requires withdrawal.

UV exposure causes gradual degradation and can be difficult to quantify by colour alone. Storage away from direct sunlight, heat, chemicals, sharp objects and damp contamination extends service life, but age by itself is not a substitute for inspection or a manufacturer life limit.

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Examination and Records

Under LOLER, a textile sling used as a lifting accessory follows the six-month default thorough-examination interval unless a competent-person examination scheme sets another interval. The scheme does not require regulator approval. Examination is also needed after exceptional circumstances liable to jeopardise safety.

Pre-use checks, interim inspections, maintenance and thorough examination are separate controls. Record quarantined items so they cannot be returned by mistake. Cutting up a sling may be part of controlled disposal, but the operator must follow site tools and waste procedures.

The reliable decision sequence is identify, inspect, understand exposure, apply the product criterion, control the item.

A Small-cut Scenario

A shallow-looking edge nick is found beside load-bearing stitching. Measuring it at less than ten percent of sling width does not clear the sling because its location and the number of severed longitudinal yarns matter. The user withdraws and quarantines it, records the identity and exposure, and applies the exact maker's discard criterion. This illustrates why a dimensional shortcut cannot replace inspection of the actual load path.