Ok, say i have a 3/8" grade 70 transport chain-WLL of 6600 lbs. A ratchet binder rated at 12000 lbs. Then a chain cutout in my landoll trailer ( called butterflies but i think they look like space invaders). Unmarked so i assume that DOT will give it 5k. How does the DOT rate the securement points on trailers-do they get halved as well as the chain and binder? Example: a 40K lb macnine. 6 chains and binders . The chain cutout, being only 5K, means ive got 6x5k, or 30k, worth of securement. But since its indirect, we halve it, thus reducing it to 15K. Whick is 5K too little. Or does the DOT simply look at the chain and binder, and halve that? So the chain gets halved to 3300 so that tiiedown gets 3300 vs 2500 if they halve the cutout. This would make the differnce between putting either 6 or 8 chains on that 40K machine. I've been putting 8, because i suspect the trailer attachment point shoukd be factored in, but man it seems oversecured with 8. That woykd mean an 80K machine would need 16 chains (!) If the D rings or chain cutouts are only rated for 5K.
Am i overthinking this?
Figuring WLL and trailer securement points
Discussion in 'Heavy Haul Trucking Forum' started by randomname, Jul 6, 2019.
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cke, snowman_w900, LoneCowboy and 1 other person Thank this.
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Securement points are not required to be rated so your 5k assumption is incorrect.
As far as giving 50% of the anchor point when used as a direct securement that’s a good question. I have always used the full rating. But someone could easily change my mind.cke, snowman_w900, Oxbow and 2 others Thank this. -
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My Anchor points on the deck of my Ravens is rather small, but many. 4000 WLL each. Since i use a mess of chain I know nothing about call it 6000 WLL each. Straps 4000 WLL
Eventually I can manage a 52000 pound coil with everything hooked in reach. 24 chain and 14 straps over the top. That's around about twice WLL of entire Coil. I just don't count that high.
This is ordinary flatbed with big stuff in my time now and then when necessary. I am not a OS man and cannot get too deep into particulars. If DOT has a problem with all that stuff on it and cannot add up good, we will have a smoke and help him learn. -
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By your logic if I hook a 6600 pound chain direct is it not able to withstand 6600 pounds? According to DOT it’s not.
Not arguing just discussing.cke, snowman_w900, Bean Jr. and 4 others Thank this. -
24 chains and 14 straps? Wtf!! I call BS!
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I never said you should ignore the rating but you certainly legally could. “Could” and “should” have very different connotations. You’re 6600 pound chain should certainly still withstand in excess of 6600 pounds of force.
The DOT did not state that the chain couldn’t withstand the 6600 pound. They’ve stated in their reasoning (which I can probably find if you want) that they reduced the rating not because of the strength of the device but because of the way it interacts with the load. An indirect that is defined as “as attaching to the trailer, passing over through or around and returning to a point on the opposite side of the trailer” (from memory and probably slightly off but good enough for our purposes) that creates the effect of the load being heavier, creating more downforce and immobilizing the object. A single chain on one side does nothing to immobilize the object from lateral movement without an opposing tiedown on the other side. To some extent I can see their point but I don’t think halving the direct method is necessarily the proper answer but it probably does serve the lowest common denominator.
To the question of tiedown ratings I think the WLL is the number that it states to be. If I’m hooked to a 5400 pound stake pocket it’s going to take in excess of 5400 pounds to fail that securement device regardless if the other end of the tiedown is hooked directly to the load or on the other side to another stake pocket.cke, snowman_w900, SL3406 and 3 others Thank this.
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