SAFETY SERIES –5
SAFE WORKING INSTRUCTIONS FOR USAGE OF CHAIN SLINGS AND CHAIN PULLEY BLOCK
- At the beginning of work, check slings and hooks for defects, dirt and grit. Give special attention to slings to which the hooks or rings have been added to make certain they are secure.
- When raising / lowering the load, see that it safely clears adjacent stockpiles.
- Never use a sling that has stretched or a hook that has begun to straighten. When permanent set of the hook is greater than 15 % in excess of normal throat opening, replace the hook.
- Distribute the load equally on the legs of a sling. As the angle of the leg increases from the vertical, the Safe working load of the chain pulley block decreases as given in the figure.
- See that the slings are not kinked, twisted or knotted.
- Make sure that the load does not exceed the rated load capacity of the chain pulley block at various angles of the sling with the vertical.
- Center the chain pulley block directly over the load to prevent the load from swinging when it is raised. Be sure the load is balanced.
- While hooking or unhooking a load, keep hands out of pinch points.
- Do not leave separator blocks or short lengths of steel on top of a load.
- Whenever possible, walk ahead of the moving load. See that it is carried high enough to clear all obstructions.
- Do not drag, throw or drop slings.
- Never splice a chain by inserting bolt between two links.
- Never put strain on a kinked chain. Workmen should be trained to remove the slack slowly and see that every link in chain sets properly.
- See that the load is always properly set on the bowl of the hook.
- Do not use hammer to force a hook over a chain link.
- Chains not in use should be stored in suitable rack.
- Do not carry load over men on the floor.
- Do not allow men to ride on a load or on crane hook.
- Never pick up a load beyond the rated capacity of the crane.
- Do not allow the load swing against floor men.
- Damaged hoists must be removed from service.
- Chains should not be replaced, lengthened or spliced.
- Chain pulley block should be calibrated for its rated load once in a year and the test certificate has to be obtained from a competent person and maintained.
- The supporting structure (load hook) to which hoist is attached must have sufficient strength to support the load.
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