For plant maintenance engineers inspecting hoist ropes
Crane Wire Rope Defect Guide
Identify the defect you are seeing, record the right evidence, and choose the next inspection or replacement action before the crane returns to normal service.
Quick answer
A crane wire rope defect should be assessed by type, location, pattern, severity, rate of change and rope history. Clustered broken wires, valley breaks, severe corrosion, kinks, birdcaging, crushing, heat damage or sudden diameter loss should trigger restriction, competent inspection or replacement review before continued service.
Instant field triage
Select the defect you see
This is a practical prompt for what to observe and record. It is not a universal discard rule.
Inspection evidence
What to record before deciding
1. Rope identity
Crane ID, hoist, rope construction, nominal diameter, grade, core, lay, installation date and certificate reference.
2. Defect map
Distance from termination, drum layer, sheave zone, running section, dead end or repeated bend zone.
3. Measurements
Diameter readings, broken-wire count and reference length, corrosion severity, lubrication condition and photographs.
4. System condition
Drum grooves, sheave wear, fleet angle, winding pattern, overload evidence, shock loading and rope rubbing points.
5. Decision
Continue, monitor, reduce interval, restrict service, arrange NDT/MRT, repair system cause or replace rope.
6. Follow-up
Responsible person, due date, spare rope action, vendor support and evidence retained for the next inspection.
Defect to action matrix
Use the observation to choose the next guide
| Observation | Why it matters | Next action | Open guide |
|---|---|---|---|
| Broken wires | May indicate fatigue, bending stress, abrasion or overload. | Count, map and assess pattern against applicable criteria. | Broken-wire guide |
| Diameter reduction | Can indicate wear, core deterioration, corrosion or crushing. | Measure consistently and compare with baseline/new rope data. | Diameter guide |
| Internal damage suspected | External appearance may hide loss of metallic area or internal breaks. | Consider competent specialist inspection and NDT/MRT where justified. | NDT/MRT guide |
| Discard criteria unclear | Limits depend on rope type, defect type, reference length and location. | Use the correct standard edition and competent-person judgement. | ISO 4309 guide |
| Replacement timing unclear | Calendar age alone is not a safe replacement rule. | Base replacement on condition, duty, environment and history. | Replacement guide |
Safety boundary: This page supports inspection planning and evidence capture. It does not certify a rope as safe, provide a universal discard limit or replace manufacturer instructions, site rules, applicable standards or a competent person's decision.
Common questions
Wire rope defect FAQs
What are serious crane wire rope defects?
Serious crane wire rope defects include clustered broken wires, valley breaks, breaks near terminations, kinks, birdcaging, crushed sections, severe corrosion, heat damage, sudden diameter reduction and any rapidly worsening deterioration.
Should a crane wire rope be replaced as soon as one broken wire is found?
Not always. The decision depends on rope construction, broken wire count, location, pattern, reference length, duty, operating history and applicable discard criteria. Clustered breaks or breaks near terminations need more urgent assessment.
What evidence should be recorded during wire rope defect inspection?
Record crane ID, rope construction, nominal diameter, actual diameter readings, defect location, defect type, photographs, broken wire count, corrosion condition, lubrication condition, drum and sheave observations, decision and follow-up action.
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