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Safely applying Below-the-Hook arising Hardware (2011-04-28 20:21:02)
Currently, there is a variety of rigging hardware on the market used to lift materials on cranes, and abiding condom as applying below-the-hook lifting hardware asks beneficial applies and good sense.
When it refers shackles, the most commonly used is the screw pin anchor type.Don't apply this case from shackle in a situation where the pin can roll under a load and eventually back out. Use a round pin or safety/bolt type where the pin or bolt will spin
freely.
Shackles are meant for a straight vertical pull, so it is important to center the hook on the pin when hanging a shackle pin up where two slings are used. It also is a recommended practice to use washers as spacers to assure the shackle is hanging evenly
on the pin.
As it relates to pins, never replace the original pin of a shackle with a different bolt and nut. The replaced bolt may bend, or even fail, under a load. Replacing the original pin constitutes a modification, which increases the likelihood of failure and exposes the person or company responsible for the modification to possible liability.
Modification of the original product also makes the working load limits null and void. This warning also applies to mixing and matching pins from different manufacturers, as well. It is unacceptable to put a self-colored or painted pin into a galvanized shackle bow. This is unsafe because some manufacturers tap the screw-pin hole oversize to accommodate a hot galvanized pin, resulting in a sloppy fit for the nongalvanized pin.
Finally, before putting a shackle in service, check to make sure the bow is marked on the shackle with the size, working load limit, country of origin, traceability code, and the manufacturer’s name or identification. Identifying the manufacturer is very important because imported products,particularly from China, will not always have the manufacturer’s identification. Shackles without manufacturer’s identification may fail to meet certain federal specifications, including the performance requirements of Federal Specification RR-C-271D Type IV A and B and ASME B30.26 specifications. If a failure comprised always to come, the makers gradings become identical authoritative.
While the country of origin is significant, only knowing where the shackle came from will not help the end user trace the shackle back to the manufacturer to find out information about the steel used to produce the shackle, among other things. Most U.S.manufacturers will have some type of traceability code stamped or in raised letters to trace the product back to the heat of steel at the mill. This provides full mill test certification for the physical and chemical properties of the steel from which the shackle
is produced.
Markings are also very important. Owning hardware with insufficient markings is the same principle as having slings without any tags. With all of the quality issues concerning consumer products that are coming out of China recently, you have to ask if you feel comfortable with an industrial product in a critical application coming from a country that may have a different set of manufacturing standards than the United States.Insufficient markings also can apply to shackles that have been in service for some time and the raised letters have been worn off. While it may be a compliant shackle,
illegible markings won’t help in terms of traceability, as wear takes its toll over time on any hardware. Also inspect for elongation or gouges in the wear points and check the width between the legs of the shackle bow.
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