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In a recent incident involving an overhead crane, the operator utilized a chain sling that was attached to the crane's hook. The operator arranged the sling into a single choker hitch to lift and flip a horizontal steel frame that was supported by two sawhorses. Unfortunately, the hook on the chain sling was not equipped with a safety latch. While standing between the load and a vertical steel frame that was propped against the shop platform, the chain became detached from the hook, causing the vertical frame to topple over and crush the operator between the two steel frames. [Source: OSHA Case Histories - Rigging Accidents - Case History #7]
Here are some ways to prevent accidents of this nature:
Prohibit workers from placing their body parts in areas where they could get trapped while operating an overhead crane.
Regularly inspect tools and equipment for any defects and replace or repair them as necessary.
Provide training to crane operators on rigging procedures.
Conduct daily inspections of cranes utilizing safety checklists to ensure that all equipment is functioning correctly.
Ensure that hooks have functional safety latches and, if not, they are secured with mousing.
Safety standards
Numerous organizations are dedicated to advancing and maintaining safety standards. ASME, for instance, has been responsible for establishing safety standards in the crane, rigging, and lifting industry. One of the most frequently cited standards in this industry is the ASME B30 Safety Standard for Cableways, Cranes, Derricks, Hoists, Hooks, Jacks, and Slings.
ASME B30 is consistently referenced in Crosby's literature and training materials. The various volumes address a wide range of subjects, but they provide consistent guidance. For instance, latches are repeatedly discussed in B30.2 (overhead cranes), B30.5 (mobile cranes), B30.10 (hooks), B30.23 (personnel lifting), and other volumes.
Regarding latch usage, B30.16 (overhead hoists) sums it up nicely: "Hooks must have latches, unless using the latch creates a hazardous situation."
Crosby agrees and recommends the use of latches for almost all applications, as it is a best practice.
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