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Wire Rope Sling Facts

Inspection and Replacement Per ANSI B30.9 Inspection


All slings shall be visually inspected by the person handling the sling each day they are used. In addition, recorded periodic inspection shall be performed by a designated person, at least annually, and shall include a record of inspection.

  • Distortion of the rope in the sling such as kinking, crushing, unstranding, birdcaging, main strand displacement or core protrusion. Loss of rope diameter in short rope lengths or unevenness of outer strands should provide evidence the sling should be replaced.
  • General corrosion.
  • Broken or cut strands.
  • Number, distribution, and type of visible broken wires.

Replacement Condition such as the following should be sufficent reason for consideration of sling replacement.

  • For stand 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.
  • Severe localized abrasion or scraping.
  • Kinking, crushing, birdcaging, or any other damage resulting in distortion of the rope structure.
  • Evidence of heat damage.
  • End attachments that are cracked, deformed, or worn to the extent that the strength of the sling is substantially affected.
  • Hooks should be inspected in accordance with ANSI B30.10.
  • Severe corrosion of the rope or end attachments.

Chain Facts Inspection and Removal from Service per ANSI B30.9 Frequent Inspection:

  • Normal service - monthly
  • Severe serice - daily or monthly

Check chain and attachments for wear, nicks, cracks, breaks, gouges, stretch, bends, and weld splatter, discoloration from ecessive temperature and throat openings of hooks

  • Chain links and attachments should be hinge freely to adjacent links
  • Latches on hooks, if present should hinge freely and seat properly without evidence of permanent distortion.
  • Readable tag should be present with each sling

Periodic Inspection - Inspection Records Required

  • Normal service - yearly
  • Severe service - daily

This inspection shall include everything in a frequent inspection plus each link and end attachment shall be examined individually, taking care to expose inner link surfaces of the chain and chain attachments

  1. Worn links should not exceed values givem in table 1 or recommended by the manufacturer
  2. Sharp transverse nicks and gouges should be rounded out by grinding and the depth of the grinding should not exceed values in table 1
  3. Hooks should be inspected in accordance with ANSI B30.10
  4. If present, latches on hooks should set properly, rotate freely and show no perment distortion

Web Sling Inspection and Removal from Service Per B30.9 Frequent Inspection

The person handling the sling each day the sling is used shall make this inspection. Periodic written inspection records should be kept for all slings. Designated personnel should conduct this inspection; frequency of the inspection should be based in the following manner.

  1. Frequency of sling use.
  2. Severity of service conditions.
  3. Experience gained on the service life of sling used in similar applications.
  4. At least annually.

REMOVAL CRITERIA

  1. Acid or caustic burns.
  2. Melting or charring of any part of the sling.
  3. Broken, tears, cuts, or snags.
  4. Broken or worn stitching in load bearing splices.
  5. Excessive abrasive wear.
  6. Knots in any part of the sling.
  7. Excessive pitting or corrosion, or cracked, distorted, or broken fittings.
  8. Other visible damage that causes doubts as to the strength of the sling.

    Table 1
    Maximum Allowable Wear at Any Point of Link

    Normal Chain or Coupling LinkCross Section

    Maximum Allowed Wear Diameter Inches

    9/32

    .037

    3/8

    .052

    1/2

    .069

    5/8

    .084

    3/4

    .105

    7/8

    .116

    1

    .137

    1 1/4

    .169

    Refer to ANSI B30.9 for full details. Horizontal sling angles of less than 30 degrees are not recommended