Steel Wire Rope Slings Safety Guidelines and Best Practices

Wire rope slings are widely used in lifting applications due to their exceptional strength, durability, abrasion resistance, and adaptability. They can accommodate various load shapes and even safely handle high-temperature materials. The core construction comes in two primary types:

• Independent Wire Rope Core (IWRC): Offers higher strength and better heat resistance, making it suitable for high-temperature environments.
• Fiber Core (FC): Provides greater flexibility but has lower resistance to environmental damage.

The most common wire rope grades in lifting applications are Extra Improved Plow Steel (EIPS) and Extra Extra Improved Plow Steel (EEIPS), manufactured and tested to ASTM standards. When using other grades, always follow manufacturer recommendations.

Consider these four critical characteristics when selecting wire rope slings:

• Strength: Must withstand the anticipated maximum load
• Bending capability: Maintains structural integrity when bent
• Abrasion resistance: Withstands wear to prolong service life
• Abuse resistance: Tolerates some degree of improper use

All new wire rope slings must be clearly marked by the manufacturer with:

• Rated capacities for different hitch configurations (vertical, choker, basket) and angles
• Sling diameter or size specification
• Manufacturer's name or trademark

Rated capacity (or working load limit) serves as the critical parameter for safe lifting operations. Reference capacity tables for various configurations, based on specific wire rope grades like EIPS FC wire rope. Calculations consider:

• Material strength
• Design factor (typically 5)
• Hitch configuration
• Load angle
• Curvature diameter ratio (D/d)
• Manufacturing efficiency

Horizontal angles should exceed 30 degrees unless otherwise specified by the manufacturer or qualified person.

Minimum rope lengths between components must meet these standards unless approved by qualified personnel:

• 6×19 and 6x37 wire rope slings: 10 times the component rope diameter
• Braided slings: 40 times the component rope diameter
• Spliced eye slings: 96 times the circumference of the eye

Before assembly, weld handles or other attachments to end fittings (excluding thimble covers). Welded end fittings require verification testing by the manufacturer with retained test certificates. Always follow manufacturer recommendations for sockets and other components.

• Never use hand-tied knots to create slings
• Use only forged steel single-saddle (U-bolt) or double-saddle wire rope clips
• Prohibit malleable iron clips for sling fabrication
• Follow manufacturer specifications for clip spacing, quantity, and torque values
• Position U-bolts on the dead end of the rope
• Regularly inspect clips for proper torque and damage

A qualified person must inspect slings before each use and conduct periodic inspections based on:

• Normal service: Annual inspection
• Severe service: Monthly to quarterly
• Special service: As recommended

Inspection focus areas include:

• Broken wires
• Severe abrasion or scraping
• Kinks, crushing, or birdcaging
• Heat damage
• Damaged end fittings
• Severe corrosion
• Missing or illegible identification

Never use damaged slings or components. Only the manufacturer or qualified personnel may repair slings, with these restrictions:

• No repairs to the wire rope itself
• Repairs limited to end fittings and accessories
• Mark repaired slings with repairer's identification

• Analyze asymmetric loads with multiple legs to prevent overloading
• For angles not in tables, use next smaller angle or qualified calculation
• Never exceed single-leg capacity on any leg of multi-leg slings
• Reduce capacity when D/d ratio falls below table values

• Keep body parts clear of pinch points
• Never stand under suspended loads
• Never ride slings or loads unless specifically designed for personnel
• Use gloves when inspecting - broken wires can cause injury

• Store slings protected from mechanical damage and environmental hazards
• Follow manufacturer guidance for extreme temperatures
• Avoid exposing fiber core slings to degreasers or solvents
• Follow lubrication requirements

• Pad sharp edges contacting slings
• Use only approved methods to shorten slings
• Watch for snagging during lifts
• Balance basket hitches to prevent sliding
• For choker hitches, attach only to the sling body (not fittings)
• Maintain ≥120° choke angle unless otherwise approved
• Position loads centered in hook bowls
• Avoid impact loading

All new mechanical splice slings require verification testing by the manufacturer or qualified person before initial use. Welded end fittings must be proof-tested to twice their rated capacity.

Permanently retire any fiber core sling exposed to temperatures exceeding 180°F (82°C). For metal core slings used outside -40°F to 400°F (-40°C to 204°C), follow manufacturer guidance. Consult manufacturers when using slings in chemically active environments.