21 May Wire Rope Safety and Maintenance

Wire Rope Safety and Maintenance

Wire rope is a critical component of many cranes, hoists, and lifting systems. Its condition directly affects the safety of the lift. Improper installation, kinking, crushing, corrosion, inadequate lubrication, excessive wear, or other damage can significantly reduce the strength of a wire rope and may result in failure.

Never assume a wire rope is safe simply because it appears strong. Proper installation, inspection, maintenance, and removal from service when required are essential.

Guide for Discussion

Installing and Spooling Wire Rope

Wire rope must be installed according to the equipment and rope manufacturer’s instructions.

When transferring rope from a reel to a drum:

• Support the reel so it rotates freely and under control.
• Maintain sufficient tension to prevent loose or uneven wraps.
• Avoid reverse bending, twisting, or dragging the rope across the ground.
• Ensure the rope winds onto the drum evenly and in the proper direction.
• Do not allow the reel to overrun and create loose rope.
• Use appropriate tools when positioning rope on the drum.
• Never strike wire rope with a steel or other metal-faced hammer.
• Do not exceed the drum manufacturer’s allowable rope capacity.

Improper spooling can cause crushing, abrasion, uneven winding, and damage to the rope and drum.

Prevent Kinks and Twisting

Never pull a loop tight in wire rope. If a loop develops while the rope is being installed or unreeled, stop and straighten it before applying tension.

Once a loop is pulled into a kink, permanent damage may occur. A kink can distort individual wires and strands, reduce rope strength, interfere with proper spooling, and accelerate wear.

Wire rope with kinking or other significant deformation must be evaluated against the applicable removal-from-service criteria before further use.

Maintain Required Drum Wraps

Never operate equipment with fewer wraps remaining on the drum than required by the equipment manufacturer or applicable standard.

Do not rely on a general rule such as “two or three wraps” for every crane or hoist. Requirements vary depending on the equipment, drum configuration, rope attachment, and applicable OSHA standard.

Inspect Wire Rope

Wire rope must be inspected at the intervals required for the equipment and type of service. Inspections should be performed by personnel qualified to recognize wire-rope defects and applicable removal criteria.

Look for conditions such as:

• Broken wires
• Kinking
• Crushing
• Birdcaging
• Unstranding
• Corrosion
• Abrasion and excessive wear
• Heat or electrical damage
• Reduction in rope diameter
• Damaged end connections
• Improperly spooled rope
• Distortion or other physical damage
• Damage caused by contact with sheaves, drums, or other equipment

Pay particular attention to sections of rope that regularly pass over sheaves or drums and areas near end connections.

Wire rope that meets applicable removal-from-service criteria must not remain in service.

Cleaning and Lubrication

Wire rope should be kept reasonably clean and lubricated as recommended by the rope and equipment manufacturers.

Proper lubrication:

• Reduces internal and external friction.
• Helps protect individual wires against corrosion.
• Allows wires and strands to move as the rope bends.
• Helps reduce wear as the rope passes over drums and sheaves.

Use only a lubricant compatible with the rope and its operating environment. Do not apply substances that can damage the rope, attract excessive contamination, or interfere with inspection.

Cleaning methods should also follow manufacturer recommendations. Aggressive cleaning methods or inappropriate solvents can remove necessary lubricant or damage rope components.

Check Drums and Sheaves

A new wire rope installed on damaged equipment can quickly become a damaged wire rope.

During inspection and maintenance, check:

• Sheave grooves for excessive wear or damage.
• Sheaves for proper alignment and rotation.
• Drums for damage and improper winding.
• Rope guides and rollers.
• End connections and anchorage.
• Components that could pinch, scrape, crush, or otherwise damage the rope.

Correct equipment defects before installing or returning wire rope to service.

Never Attempt Unauthorized Repairs

Do not attempt to repair damaged wire rope by straightening kinks, hammering damaged areas, welding, or using other improvised methods.

Cutting, shortening, replacing, or otherwise modifying wire rope should only be performed when permitted by the manufacturer and applicable requirements and by personnel qualified to perform the work.

Before Every Lift

The condition of the wire rope is only one part of safe lifting operations. Before lifting:

• Verify that the crane or hoist is suitable for the lift.
• Confirm the weight and configuration of the load.
• Verify equipment and rigging capacities.
• Inspect applicable rigging and lifting components.
• Ensure the load is properly rigged and balanced.
• Establish appropriate exclusion zones.
• Keep personnel clear of suspended loads.
• Follow the lift plan and applicable manufacturer requirements.

Remember

A crane or hoist is only as reliable as the components supporting the load. Kinks, broken wires, crushing, corrosion, improper spooling, and other damage can significantly reduce wire-rope strength.

Inspect wire rope carefully, maintain it according to the manufacturer’s requirements, and remove it from service whenever applicable rejection criteria are reached. Never take questionable wire rope for granted.