Posted by John in La on May 20, 2018 at 08:46:36 from (96.33.156.55):
In Reply to: Question for YT DOT posted by John in La on May 20, 2018 at 06:41:55:
I got to get going and may not be back for a while so here is the answer.
While some are correct in that the angle of a chain effects its load capacity the FMCSA has a specific rule that covers this. Like you guys I thought a 6600 lb chain was a 6600 lb chain until I got a question wrong on a test. So if you said Chain rating is chain rating or It's the tensile strength rating of the chain, not the way it's applied you are wrong.
This is covered in §393.106 What are the general requirements for securing articles of cargo if you want to look it up.
The FMCSA uses words like "working load limit of tie downs". (WLL) So lets look at the rule. §393.106(d) is the rule that applies here.
(d) Aggregate working load limit for tiedowns. The aggregate working load limit of tiedowns used to secure an article or group of articles against movement must be at least one-half times the weight of the article or group of articles. The aggregate working load limit is the sum of:
So that says the aggregate (combined) working load limit of tiedowns needs to be 1/2 of the weight of the item it is holding.
Now for example 1 §393.106(d)(1) and (2) apply. (1) One-half the working load limit of each tiedown that goes from an anchor point on the vehicle to an anchor point on an article of cargo; (2) One-half the working load limit of each tiedown that is attached to an anchor point on the vehicle, passes through, over, or around the article of cargo, and is then attached to an anchor point on the same side of the vehicle.
So we can see if a chain goes from the trailer to the cargo it is rated at 1/2 of it's WLL. So this 6600 lb chain will only be allowed 3300 capacity.
For example 2 §393.106(d)(3) applies. (3) The working load limit for each tiedown that goes from an anchor point on the vehicle, through, over, or around the article of cargo, and then attaches to another anchor point on the other side of the vehicle.
In this example the tie down is allowed its full WLL. So the 6600 lb chain will be allowed 6600 lbs capacity.
Now read into it what you want but there it is in black and white; copied and pasted straight from the FMCSA web site.
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