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Shackle ratings - part 2

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Jimbo:
OK, looked on the Sppedy Hire website - their shackles are 'SWL' rated, how does this differ from 'WLL' ratings ?

And final question in this series - what sort of rating should we be using ?

Jim

colintandy:
:D its science all science  :D i would definetly start with 5 tonne rating and certanly look for other ways to lighten the load by either doubling up or bridling the chassis so as to pull from 2 good recovery points and to keep any snatching down to a minimum as this is when alot of breakages happen  :shock:

Tyke:

--- Quote ---i would definetly start with 5 tonne rating
--- End quote ---


I would agree on that Colin. They might be a bit bigger and heavier but better be safe than sorry. Picking up on what you said earlier about the strength of straps, then it makes sense to rate the shackles higher than the strap to avoid the possibility of the shackle breaking first. Seen flying shackles in my daily work as a mechanical engineer and trust me, they are pretty scary.

Would suggest being very carfull about where they are mounted as well. Seen more than just a bumper pulled off vehicles stuck in the gloop. Multi point mounting will spread the load and help in tricky situations to allow a better angle for the pull.

Finally be aware that some mountings will introduce a bending moment into the pin which can effectively multiply the forces applied to the shackle and pin by very large amounts. Always try to mount the shackle so it can 'turn and swivel' and allow the recovery load to be applied directly to the mounting points. It goes without saying that these should be sound and suitable for the loads expected. Swivelling blocks, as on your vehicle, and most others who have seriously considered recovery,  are the correct way but not always to be found on all vehicles, my own included at the moment, (But that will be changing shortly).

If in any doubt always err on the safe side and dont forget a blanket over the strap, rope or whatever to absorb the energy should the strap fail.

I know I'm 'preaching to the converted' on many things here but newcomers to the scene don't always recognise the dangers involved in recovery situations.

BE SAFE RATHER THAN SORRY

Cheers for listening guys - hope I havn't bored those who already know  :wink:

Jimbo:
Thanks for all the useful info - much appreciated.

Time to go shopping for some 5T shackles !

Jim

Lostboy:
Thinking of things breaking during recovery, has anyone got a copy of the video of the towing eye coming off the car when it was being recovered by a Rangie? Might be a useful thing to point people to when talking about making sure you have good kit...

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