REMOVAL CRITERIA


Wire Rope Sling Removal

Wire Rope Removal

Web Sling Removal

Poly Roundsling Removal

Chain Sling Removal

Twin-Path® Sling Removal

Wire Mesh Sling Removal

 

Wire Rope Slings
Wire Rope Slings (ASME B30.9) – A wire rope sling shall be removed from service if conditions such as the following are present:

1. Missing or illegible sling identification.

2. Broken wires:

  • For strand-laid and single-part slings, ten randomly distributed broken wires in one rope lay, or five broken wires in one strand in one rope lay.
  • For cable-laid slings, 20 broken wires per lay.
  • For six-part braided slings, 20 broken wires per braid.
  • For eight-part braided slings, 40 broken wires per braid.

3. Severe localized abrasion or scraping.

4. Kinking, crushing, bird caging, or any other damage resulting in damage to the rope structure.

5. Evidence of heat damage.

6. End attachments that are cracked, deformed, or worn to the extent that the strength of the sling is substantially affected.

7. Severe corrosion of the rope, end attachments, or fittings.

8. For hooks, removal criteria at stated in ASME B30.10.

9. Other conditions, including visible damage, that cause doubt as to the continued use of the sling.

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Wire Rope

Wire Rope shall be immediately removed from service if any of the following conditions are present:

Birdcage1. “Birdcaging” is caused by sudden release of tension and the resulting rebound of rope. These strands and wires will not be returned to their original positions.
2. “Localized Wear” over an equalized sheave. The danger is that it’s invisible during the rope’s operation. Localized wearThe rope should be pulled off the sheave during inspection and bent to check for broken wires.
High strand3. “High Strand” is a condition in which one or more strands are worn before adjoining strands. This is caused by improper socketing or seizing, kinks, or dog-legs.
4. “Curled” is a condition in Curledwhich one or more strands are worn before adjoining strands. This is caused by improper socketing or seizing, kinks, or dog-legs.
5. “Drum Crushing” is caused by small drums, high loads and Drum Crushingmultiple winding conditions.
6. “Valley Wire Breaks” where the wire fractures between strands or a broken wire protrudes between strands, replace when there is Drum Crushingmore than one valley break.
7. Wire ropes used as running ropes other than sand lines should be removed from service when broken wires meet any of the following criteria:

  • a. Mobile cranes for six and eight strand constructions, replace when you see six randomly distributed broken wires within one lay length, or three broken wires in one strand within one lay length.
  • b. Overhead and Gantry Cranes for six and eight strand constructions, replace when you see twelve randomly distributed broken wires within one lay length, or four broken wires in one strand within one lay length.
  • c. For rotation – resistant constructions, replace when you see two randomly distributed broken wires in six rope diameters – or four randomly distributed broken wires in 30 rope diameters.
  • d. Sand lines should be removed from service when you see three broken wires within one lay length.

8. Wire ropes used as standing ropes such as guy lines, escape lines and pendant lines should be removed from service when any of the following conditions exists:

  • a. Three broken wires are found within one lay length.
  • b. More than one broken wire is found at the end connection.
  • c. Broken wires are found in the valleys between the rope’s strands.

9. Other reasons to replace ropes, broken wires are only one way wire ropes wear out. Other conditions for removal of wire rope from services are:

  • a. Corrosion that pits the wires.
  • b. Corroded wires at end connections.

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Web Slings

Nylon Web Slings (ASME B30.9) – A synthetic web sling shall be removed from service if conditions such as the following are present:

1. Missing or illegible sling identification.

2. Acid or caustic burns.

3. Melting or charring of any part of the sling.

4. Holes, tears, cuts or snags.

5. Broken or worn stitching in load bearing splices.

6. Excessive abrasive wear.

7. Knots in any part of the sling.

8. Discoloration and brittle or stiff areas on any part of the sling, which may mean chemical or ultraviolet/sunlight damage.

9. Fittings that are pitted, corroded, cracked, bent, twisted, gouged or broken.

10. For hooks, removal criteria as stated in ASME B30.10.

11. Other conditions, including visible damage, that cause doubt as to the continued use of the sling.

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Poly Round Slings

Polyester Round Slings (ASME B30.9) – A synthetic round sling shall be removed from service if conditions such as the following are present:

1. Missing or illegible sling identification.

2. Acid or caustic burns.

3. Evidence of heat damage.

4. Holes, tears, cuts, abrasive wear or snags that expose the core yarns.

5. Broken or damaged core yarns.

6. Weld spatter that exposes core yarns.

7. Round slings that are knotted.

8. Discoloration and brittle or stiff areas on any part of the slings, which may mean chemical or ultraviolet/sunlight damage.

9. Fittings that are pitted, corroded, cracked, bent, twisted, gouged or broken.

10. For hooks, removal criteria as stated in ASME B30.10.

11. Other conditions, including visible damage, that cause doubt as to the continued use of the sling.

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Chain Sling

Alloy Steel Chain Slings (ASME B30.9) – An alloy chain sling shall be removed from service if conditions such as the following are present:

1. Missing or illegible sling identification.

2. Cracks or breaks.

3. Excessive wear, nicks or gouges.

4. Stretched chain links or components.

5. Bent, twisted or deformed chain links or components.

6. Evidence of heat damage.

7. Excessive pitting or corrosion.

8. Lack of ability of chain or components to hinge (articulate) freely.

9. Weld splatter.

10. For hooks, removal criteria as stated in ASME B30.10.

11. Other conditions, including visible damage, that cause doubt as to the continued use of the sling.

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TwinPath

1. Check-Fast Early Warning Indicator (EWI) and tell tail indicators shall extend past the tag area of each sling. If your sling is equipped with Check-Fast and the EWI is not visible or both Tell- Tails are not visible, remove the sling from service. Send to manufacture for repair evaluation.

2. If Fiber-Optic inspection is installed in the sling, Inspect by allowing light to enter the fiber optics. If the fiber optics do not transmit light from end to end, remove the sling from service and contact the manufacturer for repair evaluation.

3. Slings shall be inspected for evidence of cutting or tearing the outer cover. Slings with cuts shall be remover from service and sent back to the manufacturer for repair evaluation, Damage to the cover may indicate core damage.

4. Inspect sling for evidence of heat damage, Sparkeater slings shall not be exposed to temperatures over 200C / 300F. K-Spec and polyester slings shall not be exposed temperatures above 82C / 180F. Cold temperatures exposure down to minus 40C / minus 40F do not affect the strength of the product.

5. If any part of the sling shows evidence of chemical degradation or damage, remove the sling from service. Return the sling to the manufacturer for repair evaluation.

6. Slings using aluminum fitting shall not be used where fumes, vapors, sprays or mists of alkalis or acids are present.

7. Twin-Path lifting slings and any fittings attached shall be the subject of frequent and regular inspection. In addition to the initial inspection by a competent person and frequent written inspections, the slings shall be visually inspected before each use.

8. Written inspection shell be performed as required and document of such inspection by a competent person shell 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 condition, experience of past service life.

9. Slings shall be examined throughout their length for abrasion, cuts, heat, damage, fitting distortion or damage, tag legibility, and if any doubts are held by the inspector, the slings shall be removed from service. If deterioration is found, the slings must be removed from service.

10. Slings removed from service that are not repairable shall be destroyed and rendered completely unfit for future use.

11. Abrasion, heat damage or cut to the cover may indicate a loss of strength to the core yarns, and these slings shall not be used until evaluated by the manufacturer.

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Wire Mesh

Wire Mesh Slings (ASME B30.9) – A metal mesh sling shall be removed from service if conditions such as the following are present:

1. Missing or illegible sling identification.

2. Broken weld or a broken brazed joint along the sling edge.

3. Broken wire in any part of the mesh.

4. Reduction in wire diameter of 25% due to abrasion or 15% due to corrosion.

5. Lack of flexibility due to distortion of the mesh.

6. Distortion of the choker fitting so the depth of the slot is increased by more than 10%.

7. Distortion of either end fitting so the width of the eye opening is decreased by more than 10%.

8. A 15% reduction of the original cross-sectional area of any point around the hook opening of the end fitting.

9. Visible distortion of either end fitting out of its plane.

10. Cracked end fitting.

11. Slings in which the spirals are locked or without free articulation shall not be used.

12. Fittings that are pitted, corroded, cracked, bent, twisted, gouged or broken.

13. Other conditions, including visible damage, that cause doubt as to the continued use of the sling.

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