The reg you referred to does give a specific number and you keep repeating an unspecific answer. I never said or implied that you had any numbers in your response, which is the whole point! I know where the big, shiny letter button is too.
I thought you were trying to contribute information. Excuse me for interrupting your rambling.
When and if I have time, I will try to explain in plain english, the geometry and physics of the down force of the straps in the picture and the coil "squashing" & chain breaking in the video. (yes, the coil is getting "squashed" & no, it has nothing to do with the chains breaking point)
If anyone else has learned basic physics and wants to explain before I get to it, more power to ya.
Tarping Steel Coils
Discussion in 'Flatbed Trucking Forum' started by Gentlemanfarmer, Jun 16, 2012.
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freedhardwoods, I love a challenge, so here goes. Your statement, like many truckers, is based on A section. The reason it's important to learn the FMCSR's (green and white book) is because the regulations have overlapping applicability. For instance, the metal coils section §393.120 you are referencing is an example of a commodity-specific rule, that can only supersede the general requirements of § 393.106What are the general requirements for securing articles of cargo? when additional requirements are given for a commodity listed. This doesn't mean instead of the general requirements it means, additional. (i.e. through the eye in this coil securement case)
The section(s) you'll find your answer(s) in are § 393.106(a), (b), (c) and (d)
Now, don't forget, there is also another section that puts further requirements on the computations. § 393.102 What are the minimum performance criteria for cargo securement devices and systems?
This brings the total minimum count of chains to 3, and that's just for a 5,000 lb coil, and all these minimums I've based on at least grade 70 chain/binders and anchor points rated at 6500 lb WLL for an anchor point and 6600 lb WLL for 3/8" chains. Grade 30, although initially meeting minimum standards to do the job, means recalculating everything for the different pieces and determining the true "weakest link" in the setup....and I don't know of any one that wants chains that are weaker then their binders.
That said, looking at that demonstration, it occurred to me, that maybe they were using Grade 30 chains, and as I watched their meter (thanks for that youtube link btw), I noticed where the breaking point was. First the actual meter isn't completely visible because of the handle in the way, which prevents us from accurately being able to tell what the guage reading measurements were. It was either "X=100", "X=1000", etc, couldn't tell. Also, the scale to read wasn't clear either as the inside scale may have been a metric equivalent to the outside scale, or a subcount etc.
Assuming, the outside scale was "X=100" and the inside scale was a subguage of "X=1000" it looked like the first chain was breaking at 2,265 lbs which is close to Grade 30 3/8" (they looked like) WLL of 2,650 lbs. So the video only raised more questions than it thought it was answering. In addition, the "coil" was a welded reinforced drum with no edge protection for the chains (a major violation on a real coil), and it had a hydraulic cylinder with constant and increasing pressure. The only reason the other chains over the top didn't pop, is because they were longer and had more elasticity because of that length.... but because of that longer length and elasticity, they really aren't holding anything down either because they don't actually get engaged by the pump, until the first chain snaps.
Sorry, like the other guy said, at $640 a set up, I'll buy extra chains and over chain the dang thing, by the time it walks through all those chains, the truck would have long since stopped.Last edited: Jul 24, 2012
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Freedhardwoods are you trying to defend that stupid contraption?
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Maybe your detailed explanation will help some here but the ones that could really stand to learn something will probably ridicule you like they do everyone else so they can feel important in their own mind.
It's easy to see why so many from here left for another forum. I just show up here every once in a while to see if anything has changed. Not any better yet.Last edited: Jul 24, 2012
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Ridiculing something you don't understand doesn't make you smarter nor does it make you look smarter. It actually works the other way. -
For example, the section you refer us to, doesn't have the full language of the different tiedown types and their values, in fact it's missing the reference I make to the 100% WLL value for an indirect connect.
Have a nice day.
Update: I just checked out the coded reference to your link and it looks like it was part of a mass document scan, and was published in 2003, which means it doesn't have the updated references and rules like the links I gave you, which is from the Final Rules of the Federal Code of Regulations on the FMCSA site of which sections are updated as the year goes by.Last edited: Jul 24, 2012
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Last edited: Jul 25, 2012
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