Basics of Discard: Definition and Meaning
The discard status of lifting gear refers to the condition in which further use of the load-bearing device is no longer permitted. Regular inspections by qualified personnel form the basis for this assessment. Mechanical damage, wear and tear or deformation in particular can lead to discard status.
Different types of lifting gear have specific criteria for when they must be discarded. For example, with chains, elongation and wear play a key role, while for textile lifting gear, visible damage is often the decisive factor. Assessing when lifting gear should be discarded requires solid technical knowledge and practical experience.
Safety when handling lifting equipment largely depends on accurately assessing when it should be discarded. Experts must be familiar with the various wear mechanisms and able to evaluate them correctly. A lifting device that has reached discard status not only endangers those directly involved but also the entire working environment.
Legal Basis and Regulations
Legal regulations govern the testing and assessment of lifting gear for discard readiness. The Industrial Safety Ordinance mandates regular inspections by qualified personnel. Technical rules for industrial safety further define these requirements for different types of lifting gear.
Employers are responsible for adhering to inspection intervals and documenting the results. Experts must base their assessment of discard readiness on current standards and regulations. DGUV regulations offer important guidance for practical implementation.
The scope of testing depends on the type of lifting gear and its conditions of use. Components that are subject to particularly high stress or are critical to safety require shorter inspection intervals. Test results must be clearly documented and retained at least until the next scheduled inspection.
Audit Obligations and Documentation
Systematic documentation of inspections forms the basis for seamless tracking of the lifting gear’s condition. Inspection logs or electronic systems must include all relevant information for assessing wear and tear, including test dates, identified defects, and corrective measures taken.
Regular visual inspections by trained personnel supplement the mandatory tests. These checks can provide early signs that a product is nearing its discard stage. Documentation should also include details of any repairs or maintenance measures taken.
Test reports must clearly state whether the lifting gear is fit for use. If it is found to be no longer suitable, it must be immediately removed from service. Marking unusable lifting gear helps prevent accidental reuse.
Discard Criteria for Sling Chains
The precise assessment of sling chains' discard readiness requires special attention to various wear indicators. Mechanical stress causes wear to the chain cross-sections, which must be measured. An elongation of the chain by more than 5% over its nominal length indicates that it is nearing discard readiness.
Corrosion damage can significantly reduce the load-bearing capacity of chain slings. Deep rust scars or extensive rusting require the immediate discard of the chain. Deformation of individual chain links (for example, due to overloading or improper handling) also warrants immediate disposal.
Welding spatter or exposure to heat can alter the material properties of a chain. Discoloration is an indicator of such thermal stress. Cracks or incipient cracks in the chain links—especially in the weld seams—require the immediate removal of the chain sling from service, as they indicate it is ready for disposal.
Chain Wear Measurement
Accurate wear measurement is at the core of chain testing. Precise measuring instruments are used to record the reduction in cross-section of the chain links. Measurements are taken at the points under the greatest stress, typically in the contact areas of the links.
A reduction of more than 10% in the cross-section of a chain link indicates that the chain sling must be discarded. Measurements should be taken at several representative points. It is especially important to inspect the first chain links after the suspension points, as these areas typically experience the greatest stress.
The results of wear measurements must be carefully documented. Values approaching the limit require shorter inspection intervals. Modern measuring tools allow for digital recording and evaluation of measurement data, enabling better tracking of wear progression.
Special Requirements for Discarded Lifting Straps
Textile lifting gear, such as lifting straps, is subject to specific criteria for assessing discard status. Cuts, tears, or unraveled seams indicate that the lifting strap must be discarded immediately. Chemical influences can damage the fibers and are often difficult to detect.
Severe surface wear or exposed load-bearing threads indicate progressive weakening of the material. UV radiation can reduce the strength of textile slings, and faded or bleached color markings are signs of such damage.
Checking the labels is an important part of inspecting lifting straps. Missing or illegible labels mean the strap must be discarded, as critical information about load-bearing capacity is no longer visible. Deformations or permanent distortion also indicate overloading.
Visible Damage and Assessment
Systematic assessment of visible damage requires a structured approach when testing lifting straps. Crushing or kinking in the fabric can significantly reduce load-bearing capacity. Particular attention must be paid to the edge protection coatings, as damage to these can also lead to the straps being discarded.
Contamination significantly complicates the assessment of the material's condition. Oil or grease residues can weaken the fabric and must be carefully examined. For multi-layered lifting straps, the condition of the inner layers should also be checked, if accessible.
Inspection of the loops and end connections requires particular care. Frayed or unraveled seams in the loop area indicate that the lifting strap must be discarded. Deformations or compressions in these highly stressed areas can also impair usability.
Discarded Ropes: Wear Characteristics and Testing
Various signs of wear play a central role in assessing the discard status of ropes. Wire breaks are a particularly important criterion. The number of visible wire breaks over a specific reference length is a key factor in determining whether the rope should be discarded.
Rope deformations such as kinks, bulges, or creases impair the rope’s strength. These often result from improper handling or overloading. The rope’s diameter should be checked regularly, as a reduction in cross-section can indicate that the rope is nearing its discard date.
Proper lubrication significantly extends the service life of a rope. Lack of lubrication increases wear between the wires. Internal corrosion, which may not be visible externally, can also reduce the rope’s load-bearing capacity. Regular checks of rope lubrication help delay the need for discard.
Wire Breaks and Corrosion Damage
Assessing wire breaks requires a systematic examination of the entire rope length. Particularly critical areas include rope end connections and deflection points. The allowable number of wire breaks depends on the rope’s construction and its application.
Corrosion damage can drastically reduce the load-bearing capacity of a rope. External corrosion is visible through rust formation and material loss on the rope’s surface. Internal corrosion is more insidious, often becoming noticeable only at an advanced stage. Both types of damage can lead to the rope being discarded.
Inspections for corrosion damage must be conducted with particular care. Rust flags at wire break points indicate progressive corrosion. Material abrasion between the strands can also reduce rope strength and must be considered when assessing the rope’s discard status.
Preventive Measures to Extend the Service Life
Preventive measures play a crucial role in delaying the need to discard lifting gear. Regular cleaning and maintenance remove harmful dirt and aggressive substances that could otherwise cause premature wear or chemical damage.
Correct handling of lifting gear significantly impacts its service life. Sharp edges must be covered with appropriate edge protection. Avoiding twisting and bending during lifting prevents localized overstress. Textile lifting gear is especially sensitive to these stresses.
Proper maintenance by qualified personnel significantly contributes to longevity. For wire ropes, this includes regular re-lubrication according to the manufacturer’s specifications. Chains require occasional cleaning and inspection to ensure the mobility of their links.
Storage and Maintenance
Correct storage of lifting gear prevents unnecessary damage during periods of non-use. Textile lifting gear must be protected from UV radiation and moisture. A dry, well-ventilated storage area helps prevent corrosion of chains and ropes.
Hanging slings should remain free of kinks and deformations. Storage areas must prevent damage from other tools or falling objects. Dirty slings must be cleaned before storage to avoid material deterioration.
Systematic maintenance planning enables timely implementation of necessary measures. This includes regular visual inspections for damage or wear. Documenting maintenance work makes it easier to monitor the condition of the equipment.
Training and Staff Qualification
The professional assessment of discard readiness requires comprehensive knowledge and practical experience. Regular training courses provide up-to-date expertise on wear mechanisms and testing methods. Staff learn how to reliably identify critical conditions in lifting equipment.
Training to become a qualified person includes both theoretical and practical elements. Knowledge of material properties and load limits forms the foundation for well-informed decisions. Practical exercises develop the ability to detect early signs of damage and monitor its progression until the equipment is ready for disposal.
Regularly refreshing specialist knowledge ensures the quality of inspections. New technical developments and updated regulations must be considered when assessing whether a product is ready for discard. Sharing experiences among examiners improves the reliability of these decisions.
Conclusion and Safety Recommendations
Consistent assessment of wear and tear forms the basis for the safe use of lifting gear. Regular inspections by qualified personnel help prevent accidents caused by worn or damaged components. Careful documentation ensures all decisions are traceable.
Preventive measures significantly extend the service life before a lifting device must be discarded. Proper handling and regular maintenance protect the material. Investing in high-quality lifting gear and ensuring professional testing pays off with increased durability.
Safety always comes first when assessing whether a device is ready for disposal. In doubtful cases, a cautious approach is essential to ensure occupational safety. Immediate disposal of lifting gear deemed ready for discard prevents accidental reuse.
