HAMRON 330076 Snatch Strap Instruction Manual

HAMRON 330076 Snatch Strap

Read the User Instructions carefully before use.
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Any damage visible on the cover indicates potential damage to the load- bearing core. The following are examples of defects or damage that can affect further safe use:

• Chafing of the surface. In normal use the fibres in the surface of the jacket are exposed to a certain amount of chafing. This is normal and has little effect. However, the effect of this can vary and when the process continues a certain loss of strength should be expected. More substantial damage from chafing, especially damage to specific areas, must be considered to be critical. Specific abrasion damage, as opposed to general wear, can result from sharp edges when the sling is loaded and can lead to the jacket being ripped off.

• Cuts in the jacket, lateral or longitudinal, or all damage to seams, are sufficient reason to seriously question the condition of the core.

• Visible core.

• Chemical decay. This leads to spot weakness and destruction of the material.
  Signs of this are flaking of the superficial fibres, which can be rubbed off.

• Heat or friction damage. Signs of this are that the fibres in the jacket become polished.
  In more severe cases fusion of the fibres can occur, which points to a weakening of the core.

• Damaged or deformed fittings.

CHOOSING AND USING THE CORRECT ROUND SLING

• When choosing and specifying a round sling manufactured from synthetic fibres, consideration should be taken to the requisite maximum load (WLL), the way it is going to be used, and the type of loads to be handled. The size, shape and weight of the load, together with the intended method of use, working environment and type of load, all influence the correct choice. The sling chosen should have sufficient strength and length for its use. If more than one sling is used to lift a load, they should be identical. The sling material should not be affected negatively by the environment or the load. Additional fittings and lifting devices should also be taken into consideration. They should be compatible with the sling, or slings.
• Round slings should be overloaded: The maximum load (WLL) for all applications is shown on the label.
• Only proven sling methods should be used. Coupling, lifting and lowering should be planned before the lifting is started.
• Round slings should be placed in the correct positions and coupled to the load in a safe way. A sling should be connected to the load so that the loading is uniform over the entire width. A sling should never be twisted or knotted. Damage to labels should be prevented by keeping them away from the load, hook and looping.
• The values for the maximum loads (WLL) for multi-part straps have been determined on the assumption that the load on the sling unit is symmetrical. This means that when the load is lifted the parts lie symmetrically in the same plane and with the same angle to the vertical.
• For three-part slings, where the parts lie in the same plane, but not symmetrically, the greatest tension occurs in the part for which the sum of the angles in the plane to the adjacent parts is greatest. The same effect occurs for four-part straps, with the exception that the rigidity of the load must also be taken into consideration.
• Note: When the load is rigid the main part of the weight can be taken up by only three, or even two parts, while the other parts only counter balance the load.
• A sling should be protected from edges, friction and chafing, both from the load and the lifting device. When reinforcements and protection from damage caused by edges and/or chafing are supplied as part of the sling, these should be correctly positioned. It may be necessary to use supplementary protection.
• The load should be coupled to the sling so that it cannot tilt or drop out during the lift. A sling should be coupled so that the lifting point of the hook lies directly over the centre of gravity and the load is in equilibrium and stable. If the centre of gravity of the load does not lie under the lifting point of the hook, the sling can move in the hook.
• When using a U-lift the load should be secured because this type of lift does not have any gripping action, as opposed to looped lifting, and the sling can roll through the hook’s lifting point.
• For slings used in pairs it is recommended to use a spreader so that the parts of the sling hang as vertically as possible and the load is distributed equally between the parts.
• When a sling is used for looped lifting it should be coupled to form the natural angle (120°) thereby avoiding the development of heat from friction. A sling should never be forced into position, nor should at attempt be made to tighten the loop. The correct method to secure a load with a double loop is shown in the figure. This makes it safe and prevents the load from sliding out of the sling.
• The safety of the personnel must be guaranteed during the lifting. Persons in the danger zone should be warned that the lift is taking place, and if necessary leave the danger zone. Hands and other parts of the body should be kept away from the sling to avoid injury when the sling is tensioned. For planning and management of the lift and the application of safe working methods, refer also to ISO 12480-1.
• A trial lift should be carried out. The slack should be taken up before the sling is tensioned. Lift the load slighly to check that it is secured and assumes the intended position. This is especially important for U-lifts and other loose couplings where the load is held by friction. If the load tends to tilt, it should be lowered and recoupled. Redo the trial lift until the stability of the load is secured.
• Make sure that the load is under control during the lift, i.e. prevent rotation or collision with other objects. Sudden or jolt loading should be avoided because this increases the tensions on the sling. A load in the sling, or the actual sling, should not be dragged over the ground or uneven surfaces.
• The load should be lowered down in the same controlled way as during the lifting. Securing of the sling when the load is put down should be avoided. The load should not lie on the sling if this will cause damage; the sling should not be pulled when the load is resting on it.
• On completion of the lifting the sling should be put into suitable storage. When slings are not in use they should be stored in a clean, dry and well ventilated place and at the same temperature as the surroundings, on a stand, without contact with sources of heat, chemicals, vapour, corrosive surfaces, direct sunlight or other sources of ultraviolet radiation.
• Before being put in storage, slings should be examined for damage that may have occured during use. Damaged slings should never be returned to the storage area.
• When slings have come into contact with acids and/or alkalis, it is recommended to rinse them with water or to neutralise them with a suitable agent before putting them into storage.
• Slings that have become wet during use, or as a result of cleaning, should be hung up to dry in the air.
• Before use, the sling should be examined for any faults and to ensure that the designation and specifications are correct. A sling without identification, or which is defective, should never be used and should be handed over to an expert for examination.
• Regular checks should be made of any defects or damage during the period the sling is used, including damage concealed by dirt, which can affect the further safe use of the sling. These checks should include all fittings and lifting equipment used together with the sling. If there is any doubt about the quality, or if any of the required markings have disappeared or become illegible, the sling should not be used and should be examined by an expert.

USING ROUND SLINGS MADE OF POLYESTER DURING DIFFICULT CONDITIONS OR DANGEROUS APPLICATIONS

1. Round slings made of polyester (PES) are resistant to most mineral acids, but are damaged by alkalis. Harmless acid solutions or alkalis can through evaporation become so concentrated that they can cause damage. Contaminated slings should be taken out of operation immediately, rinsed with cold water, dried in the air and handed over to an expert for examination.
2. Round slings made of polyester are suitable for use an storage at temperatures from -40° C to 100° C. Ice builds up at low temperature and in damp conditions. This can result in cuts and chafing, which lead to internal damage in the sling. Ice will also reduce the flexibility of the sling, and in extreme cases make it unusable. The given temperature range can change in a chemical environment, in which case the manufacturer or supplier should be consulted. Limited heating of the surrounding area within these limits is acceptable for drying.
3. The synthetic fibres the round sling is made of are sensitive to exposure to ultraviolet light, which can lead to the deterioration of their properties. Round slings should not be stored in direct sunlight or near sources of ultraviolet radiation.

CHECKING THE ROUND SLING IN OPERATION
The following should be checked before using the sling for the first time:

• That the sling fully corresponds with the order specifications.
• That the manufacturer’s certificate is available.
• That the designation and maximum load (WLL) the sling is marked with correspond with the information on the certificate.

INSPECTION AND REPAIRS
Inspection periods should be decided by an expert in relation to the application, environment, frequency of use, and other similar factors, but in each case the sling should be inspected visually by an expert at least once a year to ensure that it is safe to use. Damaged slings should not be used. Never try to repair a sling yourself.

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