CRANE SAFETY

SLINGS SAFETY

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Rigging Equipment Slings

Types of slings include alloy steel chain, wire rope,

metal mesh, natural or synthetic fiber rope, and

synthetic web.

Chain Wire rope Metal mesh Synthetic

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Sling Inspection

Inspect slings:

Each day before use

Where service conditions

warrant

Remove them from service ifdamaged or defective

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•Adapts to shape of the load•Can damage by sudden shocks•Best choice for hoisting very hot materials•When one link in a chain fails, the load will come down.•Must have an affixed tag stating size, grade, rated capacity, and sling manufacturer

Alloy Steel Chains

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Markings Alloy Steel Chain

It must be marked with grade or manufacturer's mark

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Inspection of Chain

• Must be visually inspected prior to use.

• Pay special attention to any stretching

(any elongation from the original length.

• The diameter of the worn chain link should

be measured at the point of the greatest

wear and compare with minimum

allowable diameters in tables.

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Chain Sling Wear ChartChain Size

(inches)

Minimum

Allowable

Chain Size

(Inches)

Chain Size

(inches)

Minimum

Allowable

Chain Size

(Inches)

¼

3/8

½

5/8

¾

7/8

15/64

19/64

25/64

31/64

19/32

45/64

1

1 1/8

1 ¼

1 3/8

1 ½

1 ¾

13/16

29/32

1

1 3/32

1 3/16

1 13/32

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Wire Rope Slings

•Used to hoist materials

•Selection considerations:

strength

ability to bend without cracking

ability to withstand abrasive wear

ability to withstand abuse

Wire rope

Strand

Center

WireCore

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Inspections

Each day before use, the sling, all fastenings and attachments must be inspected by a competent person

Additional inspections performed during use, where conditions warrant

Damaged slings must be removed from service

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Wire Rope Clips

When using U-bolt

wire rope clips to

form eyes, ensure

the "U" section is in

contact with the

dead end of the

rope

This is the correct method

Dead End

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Lubrication

Regularly lubricate ropes and chains

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Wire Rope Slings Remove From Service

If these happen, remove the wire rope sling from service

Crushing

KinkingBird Caging

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Remove From Service

Immediately remove damaged or

defective slings from service

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Type of Wire Wire Rope Sling

Damage

Birdcage damage

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Remove From Service When

• 6 broken wires in 1 lay

• 3 in one strand

• Outer wire diameter worn 1/3

original diameter

• Bird caged , crushed, kinked

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One complete wrap of a strand around the core

Rope LayRope Lay

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• Mark or code to

show:

Name or trademark

of manufacturer

Rated capacities for

the type of hitch

Type of material

Synthetic Web SlingMarkings

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• Stitching is the only method allowed to attach end fittings to webbing, or to form eyes

Synthetic Web SlingStitching

Stitching

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• Remove from service if any of these are present:

Acid or caustic burns

Melting or charring of any part

Snags, punctures, tears or cuts

Broken or worn stitches

Distortion of fittings

Synthetic Web Slings -Remove from Service

Heat Damage

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Note: A good operating practice is to keep sling angles

from going below 60 degrees

1000 LBS 1000 LBS 1000 LBS 1000 LBS

50

0 L

BS

50

0 L

BS

1000 LBS 1000 LBS

90 60° 45° 30°

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