Nylon Slings

hey Mark
when we do the Max's work on the lake with crane
I spoke with the owner of the company of crane
he has six crane like the one Krapa show you in the photos and is family is in this business from a lot of year so he had a lot of experience and he tell us that they use nylon sling or chain...he don't find problem with any of this material, but the most important thing in his opinion is don't push the limit never!!
don't complete trust in what is write on the tools ....use for little less what is stamp on..
I think that is a good way to thinking..
 
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That said however, when the crane operator applies tension to the uncut piece, the force applied to the sling may exceed, possibly by many times, the weight of the piece, and possibly exceed the rating of the sling, if the operator is not experienced. If the piece being lifted springs up when the cut is finished, too much tension is obviously being applied.

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I had to laugh as I was reading this. I watched a job done by a nation wide company the other day. They had about 10-12 feet of trunk left and had cut alot of roots around the stump. The idea was to remove the stump along with the remaining stick. They attached an eye to eye nylon, looked like an 8" or 10" flat sling, to the trunk. The crane op then applied 20,000 to it repeatedly, didn't budge. After that they put the sling to a truck and cranked on it with about the same results. It was interesting to watch from a safe distance. it was amazing to see most of the crew with in striking distance of the slings and with no PPE at all.
 
Yikes! Not a good idea to be standing in a potetial danger zone if you dont have to be there. No PPE at all? Double yikes. The company that I work for has recently switched from using steel cable chokers to nylon slings most of the time. I like the slings because they are much easier to work with, but some of the slings have a few years on them already and with nylon degrading over time I definately dont want to get close to working load limit at all. I think the slings we are using for trunk wood are 9000lbs in choker. The brush pick slings I think are 3800lbs in choker.
Of course thats brand new ratings. I just feel a little more comfortable with the steel.
 
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This is an unreal site and they have new synthetic slings where the integrity of the inner core can be checked.

Have a look at the movies and pics, down the bottom is a sling lifting a locomotive.

http://www.beaver.com.au/product_synthetic.htm

I think the only major negative of the common nylon sling may be the inability to see what the condition of the inside is. If it cops a good thump, heat etc it may be well down. Also remember that girth hitching further reduces the SWL by 20%.

I personally like them. The SWL is easy to determine by the number of lines on the sling ... well that's how it works here. One black line = 1000kg, two black lines = 2000kg and so on ... each line means 1000kg SWL

But I have noticed that if the crane operator allows you to use a sling over the chains they don't trust them as much. Could it be that the sling is rated well below the chains and worries them?

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never mind the locomotive at 183 TONS, check out the 1000 TON nuke sub reactor!!!!!!! 1000 TONS!!! /forum/images/graemlins/crazy.gif
 
I perfer using Tuflex slings, typically rated to 17.5k.


I have used flat webbing, didnt much like it for taking trunk sections out. It seems to bend it in an odd shape, trying to roll over itself.

I perfer to stay away from the limits of the slings, when in doubt double it up!
 
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