DOE-STD-1090-96, DOE Standard Hoisting and Rigging Manual ...

DOE-STD-I090-96 (Rev-I)temperatures in excess of 180 degrees F (82degrees C).5. Obtain the manufacturer's writtenapproval for use ofwire rope slings of any gradeat temperatures between 400 degrees F (204degrees C) and -60 degrees F (-51 degrees C).6. Extremely low temperatures (less thanodegrees F) may cause brittle fractures. Underthese conditions, sudden loading should beavoided and the rope should be carefully observedwhile the load is being applied.7. Do not use knotted slings.8. Do not use single-leg wire-rope slingsunless proper precautions are taken to preventsuspended loads from rotating.9. Secure each leg ofa wire-rope sling atthe hook to prevent reeving ofthe sling throughthe hook.10. Do not make a complete turn of wirerope around the crane hook.11. Use protector pads or blocking atsharp comers.12. Avoid handling hot material withwire-rope slings.13. Use shackles or adjustable chokerhooks when making choker hitches.14. Store slings on racks away frommoisture and acids when not in use.15. Ensure that damaged wire-rope slingsare rendered unusable, removed from service,discarded, and replaced with new slings.16. Before use and before storage, checkwire-rope slings for:i. Broken or cut wires or strands.ii.iii.iv.Rust or corrosion.Kinks.Broken seizing wire.v. Damage to swaged fittings.vi.Other signs ofdamage or abuse.17. The capacity ofwire-rope slings isderated by the manufacturer by applying theefficiency factors such as those given in Figure11-11.18. Do not use wire-rope clips to fabricatewire-rope slings except where the application ofslings prevents the use ofprefabricated slings orwhere the specific application is designed by aqualified person. Slings made with wire rope clipsshould notbe used as a choker hitch (see Figures11-12 and 11-13).19. When wire-rope clips are used, therating ofthe sling must be derated to 80 percent ofthe wire-rope rating to allow for the inefficiency ofthe clips.20. Double-saddle clips or fist-grip clips(Figure 11-14) may be used to make upgeneral-purpose slings provided the sling isderated to 95 percent ofwire-rope capacity.21. Follow the requirements of29 CPR1926.251, Table H-20 or the manufacturer'srecommendation (whichever offers the greaterprotection) for the number ofclips required,correct spacing, and torque. After the initial loadis applied to the rope, retighten the clip nuts to therecommended torque to compensate for anydecrease in rope diameter caused by the load.Rope clip nuts should be retightened to therecommended torque periodically to compensatefor further decrease in rope diameter during usage.Chapter 11Wire Rope and Slings 11-20