Usage & Maintenance
SAFE CHAIN USAGE
• For safe chain usage, user should remove all twists from a chain leg before lifting and should
never knot a chain.
• Never load in excess of the rated capacity for the application.
• Always inspect that chain is free from damage or wear before use.
• Always use shortening hook or clutch to shorten chain slings
• Ensure that the master link articulates freely on the hook of the crane or other lifting appliance.
• Persons must stand clear of all loads while lifting or while suspended.
• Never tip load hooks. The load should always be supported correctly in the bowl of the hook.
• Inspect all sling components prior to each use.
• Ensure that chain is protected from any sharp corners on the load.
• Always use the correct size sling for the load, allowing for the angle and possibility of unequal loading.
• Persons shall never ride the chain sling/rope sling or web sling or the load during lifting or while suspended.
• Keep a record of all slings in use and chain usage.
• During lifting, with or without the load, personnel must be alert for possible snagging of the load or the chain sling.
• Personnel must keep all body parts from between the sling and the load.
• A thorough examination, including chain usage, should be carried out by a competent person at least every year or more frequently according to statutory regulations, type of use and past records.
• Chain and components wear should never exceed 10% of the original dimensions.
• Chains with bent links or with cracks or gouges in the link should be replaced, as should deformed components such as bent master links, deformed hooks and any fittings showing signs of damage.
• Once a chain sling has been overloaded it must be taken out of service.
• Store chain slings on a properly designed rack. They should not be left lying on the floor where they may suffer mechanical or corrosion damage or may be lost.
LIMITATION ON USE
• Alloy chain or chain slings should not be used in acid or caustic solutions nor in heavily acidic or caustic laden atmospheres. The high tensile strength of the heat treated alloy material in alloy steel chains and components is susceptible to hydrogen embrittlement when exposed to acids.
• Slings must not be heat-treated, galvanized, plated, coated or subject to any process involving heating or picking. Each of these processes can have dangerous effects and will invalidate the manufacturer certificate.
• Slings may be used at temperatures between -40°C to 200°C with no reduction in the working load limit. The use of chain slings within the permissible temperature range in the table below does not require any permanent reduction in working load limit when the chain sling is returned to normal temperatures.
• A sling accidentally exposed to temperatures in excess of the maximum permissible should be withdrawn from service immediately and returned to the distributor for thorough examination.
• When using slings in exceptionally hazardous conditions, the degree of hazard should be assessed by a competent person and the Working Load Limit adjusted accordingly.