Twin-Path® Inspection

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Fiber Optic Inspection

Any of the Twin-Path® slings or single path slings can have the Fiber Optic inspection option. Just add FO to the code i.e. TPXCFO. The condition of the internal core yarn can be inspected just by checking the continuity of the fiber optic cable. If crushing, cutting, heat or chemical damage has occurred, then the damage to the fiber optic cable will destroy its ability to transmit light from one end to the other, giving the inspector a reason to remove the sling from service and send it in for repair evaluation. The fiber optic cable will conduct light using natural, overhead or flashlight sources. The inspector simply covers and removes his finger from one end and watches the other end for blinking, which indicates that the sling is OK to use for another lift.

Twin-Path® Fiber Optic Inspection

Twin-Path® Check-Fast Inspection System Twin-Path® Inspection Before Use

Check-Fast™ Inspection System

The Check-Fast® System is designed to improve job-site safety. The Check-Fast® Tag and External Warning Indicator (EWI) on a roundsling product provides for a pass / fail inspection of the internal load bearing core yarn. Damage to the core yarn from fiber on fiber abrasion, fatigue and severe overload can be detected. If the sling is mistakenly overloaded beyond rated capacity, the EWI is designed to disappear before the sling fails. The sling inspector now has a GO / NO-GO inspection device rather than relying on a subjective hand-over-hand inspection to make an educated guess if the load bearing core yarns are in good condition. This safety system is available for polyester or High-Performance K-Spec® Fiber Roundslings fabricated by authorized SLINGMAX® Dealers.

The Check-FastTM System is an independent sacrificial element in the roundsling and is not a part of the actual load bearing structure of the sling. If the Check-FastTM System indicates internal damage, it does so without further weakening of the bearing core.

Twin-Path® Slings—Inspection Before Use

  1. Tell-Tails should extend at least 1/2" past the tag area of each sling. If both Tell-Tails are not at least 1/2" long, remove the sling from service. If the Tell-Tails show evidence of chemical degradation, remove the sling from service. Send to manufacturer for repair evaluation.
  2. Slings should be inspected for evidence of cutting or tearing of the outer cover. Slings with cuts should be removed from service and sent back to the manufacturer for repair evaluation. Damage to the cover may indicate core damage.
  3. Inspect slings for evidence of heat damage. Slings with polyester or CovermaxTM covers should not be exposed to temperature above 82°C / 180°F. Aramid Sparkeater Slings should not be exposed to temperatures over 149°C / 300°F. K-SpecTM Core Slings should not be exposed to temperatures above 82°C / 180°F. Cold temperature exposure down to - 40°C / - 40°F do not effect he strength of the products. Other temperatures should be referred to the manufacturer.
  4. Slings using aluminum fittings shall not be used where fumes, vapors, sprays or mists of alkalis or acids are present.
  5. Twin-Path® Lifting Slings and any fittings attached should be the subject of frequent and regular inspections. In addition to the initial inspection by a competent person and frequent written inspections, the slings should be visually inspected before each use.
  6. Written inspections should be performed as required and documents of such inspection by a competent person shall be kept on file in the safety department of the plant or site where used. Inspections may be done more often based on frequency of use, severity of conditions or experience of past service life.
  7. Slings should be examined throughout their length for abrasion, cuts, heat damage, fitting distortion or damage and tag legibility. If any doubts are held by the inspector, the sling should be removed from service. Core integrity is determined by fiber optic light transfer if this type of tell-tail is installed in the sling. If a deterioration is found, the sling must be removed from service and returned to the manufacturer for evaluation.
  8. Slings removed from service that are not capable of repair should be destroyed and rendered completely unfit for future use.
  9. Abrasion, heat damage or cuts to the cover may indicate a loss of strength to the load core, and these slings should not be used until evaluated by the manufacturer. At area of damage, cover should be opened and the core yarns counted and visually inspected.


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