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10 When using two-, three- and four-leg chain slings the attachment points and chain sling configuration should be selected to achieve angles between the chain sling legs and the vertical within the range marked on the chain sling. In any case the angle ß, which is the angle between the chain sling leg and the vertical, should not exceed 60°. More details concerning load reductions at certain angles can be found in the relevant tables corresponding to the grade. Ensure that the load to be moved is able to resist both the vertical and horizontal force without being damaged. The hook connected to the chain should be directly above the centre of gravity. • A suspended load should not be left unattended. • If a multi leg chain sling is not used for the purpose for which it has been designed, for example a lift with less legs than the number of legs of the chain sling, the WLL should be reduced from that marked on the chain sling by applying the relevant factor given hereunder: Types of chain sling Number of legs used Factor to apply to marked WLL Two-leg 1 1/2 Three- and four-leg 2 2/3 Three- and four-leg 1 1/3 • In any case, the chain sling should have a WLL equal to or greater than the weight to be lifted. • Riggers should be aware of the risks and dangers of shock loading which may break the chain. The load should always be lifted and lowered slowly. Method of connection A chain sling is usually attached to the load with endfittings such as hooks and/or links. The components should be used for straight in line loading only, this in order to avoid bending. The lifting points fixed on the load should be seated well down in a hook (never on the point or wedged in the opening). We refer to the detailed warnings of each component in the product chapters. Symmetry of loading The working load limit values mentioned in our catalogue for each grade have been determined on the basis that the loading of the chain sling is symmetrical. This means that when the load is lifted the chain sling legs are symmetrically distributed in the plane and all legs of the chain sling have the same angles to the vertical. Refer to EN818-6:2000+A1:2008 for more details. The loading can be assumed to be symmetric if all of the following conditions are met: • the load is less than 80% of marked WLL and • chain sling leg angles to the vertical are all more than 15° and • chain sling leg angles to the vertical are all within 15° to each other and • in the case of three- and four- leg chain slings, the plane angles are within 15° of each other. If one of the above parameters is not met than the loading should be considered as asymmetric and the lift should be referred to a competent engineer to establish the safe rating for the chain sling. Alternatively, in the case of asymmetric loading, the chain sling should be rated at half the marked WLL. If the load tends to tilt, it should be lowered and the attachments changed (by repositioning the attachment points or by using compatible shortening devices). Despite the safety factor of 4 or 5, never exceed the given working load limit (WLL). Safety of lift Hands and other body parts should be kept away from the chain to prevent injury. The load should be lifted slowly until the chain is taut. As soon as the load is slightly raised, a check should be made that it is secure and has the position intended. Reference should be made to ISO 12480-1 for planning and management of the lifting operation and the adoption of safe systems of working. Never move the load during the lift over people. Lowering the load The point of destination of the load should be prepared and should be adapted to the weight and the load shape. The access to this site must be clear of any unnecessary obstacles and people. The load should be lowered carefully. Avoid trapping the chain sling beneath the load as this may damage it. Before allowing the chain to become slack, the load should be checked to ensure that it is properly supported and stable. Then the chain sling should be removed by hand and not with the lifting device. The load should not be rolled off the chain sling as this may damage the chain sling. Storage of chain slings When not in use chain slings should be kept on a properly designed rack. They should not be left lying on the ground where they may be damaged. If the chain slings are to be left suspended from a crane hook, the chain sling hooks should be engaged in an upper link to reduce risk of chain sling legs swinging freely or snagging. If the chain slings are out of use for some time they should be cleaned, dried and protected from corrosion, e.g. lightly oiled.