What are slings and accessories
A sling is a device designed to secure a load for lifting, made from materials such as chain, steel cable, or textile fibers. Accessories also include shackles, hooks, lifting beams, and other devices used between the lifting equipment and the load. Each component has a specific intended use and limitations that must be understood.
Safety depends not only on the crane’s capacity. The entire assembly must be suitable for the maneuver, including the lifting points for the load itself. The lifting plan must consider this configuration and prevent an improvised attachment from becoming the element that limits or compromises the entire operation.
Capacity and usage configuration
The maximum working load should be interpreted according to the manufacturer’s instructions and markings. A single sling can support different loads depending on the attachment method, the number of effective legs, and their angles. It is incorrect to add up individual capacities without verifying how the load is actually distributed.
The mass and center of gravity of the load must be known with sufficient reliability. An asymmetrical geometry can load some branches more than others. Temperature, the presence of chemicals, and sharp edges also matter. The material that appears strongest is not necessarily the most suitable for all conditions.
Selection of compatible elements
The components must be compatible with each other and with the attachment points, respecting the intended dimensions, supports, and directions of force. A hook, shackle, or lifting point may malfunction even if its nominal capacity appears sufficient. The instructions must allow for verification of the complete configuration.
Components should not be replaced with improvised parts, nor should devices be used whose sole purpose is to secure goods during transport. Lifting operations impose their own specific requirements. When there is any doubt about a combination of components or a special load, the operation must be reviewed by competent personnel before proceeding.
Inspection and withdrawal criteria
Preliminary inspection must confirm legible identification, condition, and absence of relevant damage. For textiles, this may include cuts, abrasion, or chemical damage; for chains and cables, deformation, wear, corrosion, or other alterations. Specific rejection criteria must be derived from instructions and references applicable to the equipment, not from an impromptu assessment.
Equipment inspection includes checks as required by usage and conditions. Any questionable accessory must be removed from service and identified to prevent its reuse until properly evaluated. Storing it with other available equipment, even if someone verbally recalls the defect, does not eliminate the risk.
Preparation and execution of the maneuver
Preparation must ensure proper securing, protection from sharp edges where appropriate, and a controlled work area. Personnel must be kept out from under suspended loads and out of paths where they could become trapped. Communication between those directing and executing the operation requires clear signals and responsibilities.
Pulling, dragging, or straining outside of the authorized configuration can damage accessories and destabilize the load. The risk of entrapment also arises when placing or removing slings. Planning must consider how to place the load stably and release items without exposing hands or body to unexpected movements.
Practical example
A part arrives at the workshop with two points that appear suitable for attachment. The team proposes using two slings of sufficient rated capacity, but they lack information on the weight or function of those points. Despite its seemingly robust appearance, the lifting operation is not authorized.
Preparation is paused until the data for mass, center of gravity, and points specified by the manufacturer is obtained. The configuration is defined, compatible accessories are selected, and their condition is checked. The example shows that the check begins before attachment, and that a capacity label on the sling alone does not validate the maneuver.
Storage and traceability
Accessories must be stored in a way that prevents avoidable damage from humidity, substances, heat, deformation, or vehicle traffic. Identification must be maintained throughout their useful life. When the management system uses internal codes, these must allow the item to be linked to its instructions and checks without obscuring the necessary markings.
The organization must clearly separate available, pending inspection, and withdrawn equipment. Repairs or modifications require the applicable procedures and skills. An accessory should not be returned to service simply because it has been cleaned or because the damage appears minor, unless the underlying cause of its withdrawal has been resolved.
Common mistakes
Common mistakes include choosing based solely on color or size, being unaware of the angle of use, using unforeseen points, and keeping accessories without identification. It is also a mistake to assume that periodic inspection eliminates the need to check the condition before each use.
The preventive approach involves verifying the load, configuration, and assembly of components before operation. In Spain, this is integrated into the obligations related to work equipment. Foreign references provide technical guidance, but their frequencies or legal requirements should not be automatically transferred to another jurisdiction.
