What is the Working Load Limit of a 2-legged Chain Sling?

4 comments

by  on February 27, 2013

Q-&-A-chat_15A Richard asks:

What is the working load limit of a ½ “ – G80 2-legged chain sling when both legs are used in a choke?

 

Peter answers:

The first thing that you want to do is to look at how the choke is rigged or rendered.  Working load limits shown on charts or tags for vertical chokes are based on the angle of choke being 120 degrees or greater.  If there is less than a 120 degree angle of choke, the choke rating must be reduced further. Once we determine the correct choke rating, we can take into account the angle of loading.

Grade 80 Chain Sling Chart

First you take the choke rating and multiply it by the SIN of the angle x 2 = Rating of a two leg sling used in a choke.

Example: 
Our charts show that ½” grade 80 chain is good for 9,600 lbs when pulled vertically with a choke hitch of 120 degrees or greater.   Let’s assume when this double sling is rigged at a 60 degree angle it has a choke hitch of 120 degrees or greater.   Our working load limit for this sling is 9600 lbs x .866 ( sin of 60 degrees) = 8314 lbs x 2 legs = 16628 lbs.

Another way is to take the rating of the sling at a 60 degree angle and reduce it by 20%. Again assuming 120 degree angle of choke, ½” Grade 80 double sling chain is good for 20,800 lbs  (at a 60 degree angle)  x .8 (20% reduction):  rating: 16640 lbs.

Our first example is a little more conservative.

If you want to learn more about rigging, check out our rigging training.

{ 2 comments… read them below or add one }

Peter Cooke Peter Cooke May 13, 2016 at 1:37 pm

Hello Ted,
If a double leg sling is rated for 15000 pounds, you must always use both chain legs. It is rated at an angle for 60 degrees from the horizon.

Can you please be more specific with your second question? We are not quite sure what you are asking.

Thank you,
Peter

ted middleton May 12, 2016 at 11:13 am

I have a question about chain sling ratings

If a double leg sling is rated for 15000 pounds
Can you use one chain leg to pick up 15000 or do you always have to use both?

On a double leg sling does each sling drop 50%?

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