Crane wire rope inspection explained

Read the rule yourself in your own copy. Our summary cites sections by number and puts the ideas in our own words. Your crane's manual and the standards govern the actual limits.

Shift, monthly and annual inspection

OSHA's crane rule, 1926.1413, sets rope checks at three levels.

Check	Who	Scope
Shift	Competent person	Visual check of ropes likely to be used that shift, before or during the shift
Monthly	Per the rule, repeats the shift check	Adds any condition earlier flagged to watch, and is documented
Annual	Qualified person	Shift check plus a thorough look at the whole rope surface, with extra attention to hidden and high-wear sections

Two details tend to show up in questions. The shift check is visual, so nobody has to untwist the rope or boom down to do it. And when a problem needs a safety-hazard call, the competent person makes it on a shift check and the qualified person makes it on the annual one.

What inspectors look for

You do not need numbers memorized to reason through most questions. Learn the picture of each defect.

Broken wires. Individual wires snap from fatigue, usually first at the crowns of the strands where the rope bends over sheaves and the drum. A few scattered breaks are a warning. Breaks clustered in one place, in one strand, or at an end connection are worse. Count them over a stated length of rope, and compare with the removal limit in 1926.1413 and the manufacturer's criteria.

Kinking. A kink forms when a loop pulls tight and the rope is permanently deformed. The strands are out of position and no longer share the load evenly. A kinked rope is a stop sign.

Birdcaging. The strands flare outward like a cage, for example when a rope is forced off its sheave. The outer strands have gone loose from the core. It is a distortion defect and a reason to stop.

Crushing and core protrusion. Rope flattened on the drum or squeezed at a crossover, or a core pushing out between strands. Both mean the rope's structure has failed.

Corrosion. Surface rust that wipes off is a lubrication reminder. Pitting, or corrosion that has bitten into the wires or loosened the strands, means lost strength inside, where you cannot see it. Corrosion also hides in places that are hard to see, like the ends and the sections that sit over sheaves.

Diameter loss. Rope wears thinner as wires fray and the core compresses. Measure the diameter against the nominal size, with a proper caliper across the widest points. OSHA sets a limit on reduction in 1926.1413, and the manufacturer may set a tighter one.

Heat and arc damage. Discolored wires, weld spatter or arc strikes from welding or an electrical event. Rope that has touched a power line gets its own treatment in the rule.

End connections. Cracked or distorted sockets and clips, and wires broken right at the termination. The ends take a lot of load and a lot of the inspection time.

Inspectors also spend extra time at known trouble spots: rope on and near the drum flanges and crossover points, the section that runs over the boom tip sheaves, and ropes that pass over equalizer sheaves or sit in reverse bends.

When rope comes out of service

The rule sorts rope problems into three groups, and each group has its own way out.

The first group is significant distortion, significant corrosion, heat or arc damage, and bad end connections. The competent person decides right away whether the problem is a safety hazard. If it is, the rope does not lift until it is replaced or, when the damage is localized, the bad section is cut out by severing the rope in two. The good length can keep working.

The second group is measured: broken wires over the rule's count, or diameter loss of more than 5%. No hazard call applies here. The rope stays out until the manufacturer's removal criterion is met (or a different one the manufacturer specified in writing), the rope is replaced, or a localized problem is severed out.

The third group is core failure in rotation resistant rope, a broken strand, and prior contact with a power line. The rope stays out until it is replaced, or a localized problem is severed out. Power line contact is the exception: that rope cannot be repaired.

Severing means cutting the rope in two. Joining lengths by splicing is prohibited, and a shortened rope must still leave two wraps on the drum at the lowest load or boom position. A rope pulled from service is tagged out, along with the crane or that hoist, until the rope is repaired or replaced.

The exam rewards one rule above all: when in doubt, the rope does not lift. A suspected defect gets a decision from the right person before the pick, not after.

Why this matters for the load chart

Capacity assumes sound rope. A chart number is only as good as the rope behind it, which is why the inspection comes before the lift plan. The how to read a crane load chart guide covers the capacity lookup. The parts of line calculator shows why each strand carries a share of the load and lets you test it. For the rigging side, try the sling capacity calculator and read sling angle and rigging basics. On the Core outline, wire rope sits in Technical Knowledge, and our Core study guide lists what to open for each task.

Practice

These scenarios are invented for practice. Answers follow.

1. At the start of the shift you see a short section of the hoist rope with a loop pulled tight into a kink. What do you do?
2. The rope is dull brown with surface rust that wipes off on a rag. No pitting, no loose strands. What does that suggest?
3. Several broken wires sit together in one strand near the socket. Is this a cosmetic issue?
4. A crane operator thinks a worn rope might be a little under nominal size and the lift is urgent. Who decides, and what is the safe default?

Answers: (1) Stop. A significant kink is a distortion defect, so the competent person decides on the spot whether it is a safety hazard. If it is, the rope does not lift until it is replaced or the localized kink is severed out. (2) Surface rust is a lubrication reminder, not necessarily a defect. Look for pitting and loose strands too. (3) No. Clustered breaks at an end connection are serious. Check the rule's count for that rope type, and if it is met the rope stays out. (4) Measure it. A reduction of more than 5% from nominal keeps the rope out until the manufacturer's criterion is met, the rope is replaced, or the damaged section is severed. Urgency changes none of that.

When you are done, take the free 10-question check. It shows which areas to study first, including whether Technical Knowledge or Load Charts needs the next session.

FAQ

How often must crane wire rope be inspected?

OSHA 1926.1413 calls for a shift inspection by a competent person, a monthly inspection that repeats the shift check and is documented, and an annual inspection by a qualified person at least every 12 months.

What is birdcaging in wire rope?

Birdcaging is when the strands flare out and loosen from the core, forming a cage shape. It is a distortion defect. If the competent person finds it a safety hazard, the rope stays out of use until it is replaced or the localized damage is severed out.

How do you know when wire rope needs replacing?

Look for kinking, crushing, birdcaging, core protrusion, heat damage, significant corrosion, broken wires over the stated limit, and diameter loss. Replace when the rule, the manufacturer or the competent person's hazard finding says the rope cannot keep working. Localized damage can sometimes be cut out instead.

What is the difference between a competent person and a qualified person?

On the exam, the competent person runs the shift and monthly checks and calls hazards. The qualified person does the annual inspection and is a person with the knowledge, training or experience to judge the work. Both are defined in the OSHA crane rule.