EN 17505:2021 Wire Rope Inspection for Cranes
EN 17505:2021 — Wire Rope Inspection Methods for Cranes is a key component of the European crane design standard series, developed and published by the European Committee for Standardization (CEN). Released in 2021 as the latest European technical specification for wire rope inspection, this standard systematically defines inspection methods for in-service crane wire ropes, including visual inspection, diameter measurement, wire break counting, electromagnetic testing, and scrap criteria. It applies to both round-strand and compacted strand wire ropes used across all types of lifting appliances.
Implementation of this standard is essential for enhancing the international competitiveness of Chinese lifting equipment and is a mandatory technical requirement for export to European markets. Kelude's technical team has conducted in-depth research on this standard system and fully integrates its requirements into product design to ensure intrinsic safety at the equipment level.
Scope and Application of the Standard
EN 17505:2021 specifies the technical requirements and safety indicators for crane wire ropes, covering all lifting appliances with a Rated Lifting Capacity of 0.5 t or above. The standard governs not only the design and manufacturing of new equipment but also provides clear technical guidance for the inspection, maintenance, and modification of in-service machinery. As an integral part of the EN standard framework, it aligns with other parts of the EN 13001 Crane Safety Standard to form a complete design specification for crane safety. The clearly defined technical parameters and safety factor requirements give design personnel a solid design basis, while also providing quantifiable acceptance criteria for type tests and factory inspections conducted by third-party inspection bodies.
Core Technical Parameter Framework
Under EN 17505:2021, the design and manufacturing of crane wire rope inspection systems must meet a rigorous set of technical parameters. These values are established on the basis of extensive test data and safety engineering principles, covering the entire process from material selection to structural design. The safety factor ranges specified in the standard account for fatigue life and limit load conditions under demanding operating environments. In practical engineering applications, design personnel must select appropriate parameter combinations based on factors such as Work Duty / Classification, load spectrum, and operating environment. The parameter cards below highlight the most critical technical indicators defined in the standard:
Comparative Analysis of Key Technical Parameters
To help design and inspection personnel better understand the technical requirements of EN 17505:2021, the following comparison table systematically contrasts the core parameters specified in the standard with general engineering practice. All values listed are either mandatory or recommended provisions of the standard and should be strictly implemented during design and selection as well as Factory Acceptance Test. For items marked "negotiable," manufacturers and users may agree on alternative values in the contract, provided they do not fall below the minimum safety requirements set by the standard.
| Technical Parameters | Standard Requirement | Recommended Value/Description |
|---|---|---|
| diameter reductionscrap criteria | Measured Diameter< nominal diameter×93% | Measured on Unloaded Straight Section, Average of Two Perpendicular Directions at Same Cross-Section |
| wire break Number of Strandsscrap criteria | 1Countlay length Within Lengthwire break> Total Number of Wires10% | regular lay Externally Visiblewire break, Lang lay Including Internalwire break Estimation |
| corrosion grade Assessment | 3Grade(Severe Corrosion+Pitting)Immediate Rejection | 1Grade Slight/2Grade Moderate/3Grade Severe(Visible Pitting Corrosion) |
| electromagnetic testing(LMA) | Acceptable Detection≥2%Loss of Metallic Cross-Sectional Area | speed0.3~1.5m/s, Magnetization Strength≥Saturation Value80% |
| Detection Inspection Frequency Requirement | Monthly Visual Inspection+Quarterlyelectromagnetic testing | A6Monthly for Grade Aboveelectromagnetic testing, A5Quarterly for Grade |
| Residualbreaking Strength Assessment | Estimated Residualbreaking Strength< Originalbreaking Strength80% | Comprehensivediameter reduction+wire break+Corrosion+Wear Comprehensive Evaluation |
Inspection Requirements and Intervals
EN 17505:2021 sets out clear requirements for Wire Rope Inspection on cranes, covering Factory Acceptance Test, Type Test, and periodic inspection. Factory Acceptance Test must be carried out on each unit by the quality inspection department at the manufacturer's facility, and equipment that passes inspection must be accompanied by a detailed inspection report and a certificate of conformity. Type Test is required when a new product is first put into production, when manufacturing is transferred to another facility, or when significant structural changes are introduced. For equipment already in service, the periodic inspection interval is determined by the work duty/classification and the operating environment, generally not exceeding 12 months. The table below summarizes the specific requirements for each inspection and maintenance activity:
| Inspection/maintenance item | Inspection Method/Standard | Frequency/Acceptance Criteria |
|---|---|---|
| visual inspection | Full-Length Surface Inspection, Record Corrosion/wire break/Deformation | Monthly, Critical Zones(Pulley/Drum Contact Section) |
| Diameter Measurement | vernier caliper(Accuracy0.02mm)Measured on Unloaded Straight Section | Monthly, Average of Perpendicular Directions at Same Cross-Section |
| electromagnetic testing | Wire Ropeflaw detector(LMA+LFDetection) | Quarterly, speed Uniform0.5~1m/s |
| Lubrication Condition Inspection | Surface Lubrication Condition, Core Oil Content | Bimonthly, Lubrication Replenish When Insufficient |
Safe Operation and Management Requirements
Under EN 17505:2021, safe operation and routine management are just as critical as technical compliance. The standard places strong emphasis on operator qualification and training, requiring that all operators complete specialized training and hold the appropriate certifications before operating equipment. User units must establish a comprehensive equipment file management system that documents the full lifecycle of installation, use, maintenance and inspection. Any safety hazards identified must be addressed through the rectification procedure specified in the standard, ensuring the equipment remains safe and controllable at all times. The standard also imposes operational restrictions under extreme weather conditions—for example, lifting operations are prohibited when wind speeds exceed the specified limit.
FAQ
Q: What are the scrap criteria for wire rope under EN 17505:2021?
A: The standard specifies several quantitative scrap criteria for wire rope: the rope must be scrapped when diameter reduction exceeds 7% of the nominal diameter; when the number of visible broken wires within one lay length exceeds 10% of the total number of steel wires; when corrosion reaches Level 3 (severe rust with pitting), regardless of the number of broken wires; when loss of metallic cross-sectional area (LMA) exceeds 10%; or when any structural damage such as strand extrusion, exposed rope core, kinking, or severe twisting occurs. If a comprehensive assessment estimates that the residual breaking strength falls below 80% of the original breaking strength, the rope must also be scrapped even if no individual indicator has reached its limit. These criteria should be evaluated collectively in practice, with the condition reached first governing the decision.
Q: What are the technical requirements for electromagnetic testing (wire rope flaw detection)?
A: The standard recommends electromagnetic testing (Magnetic Rope Testing) as the preferred method for detecting internal defects in wire rope. Electromagnetic flaw detectors must be capable of accurately detecting loss of metallic cross-sectional area (LMA) and local faults (LF), with LMA detection sensitivity no lower than 2% and LF detection sensitivity no lower than one broken wire equivalent. During testing, the wire rope travel speed should be maintained between 0.3 and 1.5 m/s, and the magnetization level must reach at least 80% of the saturation value. The detector must be calibrated before testing using a standard test bar or a simulated defect rope of the same specification as the rope being inspected. Test data should include waveform charts and analysis reports, with defect locations and severity clearly marked. Kelude is equipped with imported wire rope flaw detectors and offers professional wire rope inspection services.
Q: How are routine maintenance and inspection intervals for wire rope defined?
A: The standard specifies differentiated inspection intervals based on the crane's work duty and operating environment: cranes in Work Duty A1–A4 require monthly visual inspection and diameter measurement; cranes in Work Duty A5 require monthly visual inspection plus quarterly electromagnetic testing; cranes in Work Duty A6–A8 require monthly visual inspection plus monthly electromagnetic testing. For outdoor cranes, which are more susceptible to environmental corrosion, the inspection frequency should be upgraded one level compared to indoor equipment. Each inspection must produce a formal record documenting the wire rope model, installation date, service hours, cumulative number of lifting cycles, test data, and damage descriptions. These records should be filed in the equipment file to support remaining-life prediction and replacement decisions.
Q: What are the lubrication requirements for wire rope?
A: The standard emphasizes the importance of wire rope lubrication in extending service life. Wire rope should receive initial lubrication before installation, using the same or compatible lubricating oil or grease as recommended by the rope manufacturer. Regular re-lubrication is required during service—every two months for indoor use and monthly for outdoor use. Before re-lubricating, old grease and contaminants must be cleaned from the rope surface. The lubricant should have appropriate viscosity and adhesion, penetrate to the rope core, and form an effective lubricating film under rated load. Lubricants containing acids, alkalis, or any corrosive agents that could damage steel wires are strictly prohibited. The amount of lubricant applied should be moderate—excess lubricant can be thrown off and attract dust, while insufficient lubrication fails to provide adequate protection. Kelude recommends the use of specialized wire rope grease and provides lubrication guidance and regular maintenance services.
Kelude is a professional crane design and manufacturing company whose products fully comply with the EN 17505:2021 standard system, offering full-lifecycle services from solution design to after-sales maintenance. To learn more about how this standard is applied in our products, contact our technical team for detailed technical documentation.
