How many chains would you put on this 33,600 lb wheeled grader?
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This is a pic of the grader I moved from Montreal QC to Stoney Creek, ON (close to Buffalo, NY and US border). I used 2 chains in the front, 2 in the middle, and 3 in the back. I know most guys use only 4 chains for something like this (plus one more chain over the blade, right?) but I wanted to comply with the DOT requirement of 0.4 G for the forward movement and 0.5 g for the rearward movement. Which means the chains in the back of the machine must be able to withstand roughly 40% of its weight. And to add to confusion, there's an "aggregate work load limit" requirement, where all chain WLL together must be equal to at least 50% of the machine weight BUT - get this - only chains that go from one side of the trailer to the other side through or over the load are awarded the full WLL (4,700 lbs in my case). If a chain's one end is hooked to the trailer and the other - to the machine, for the purpose of the "aggregate work load" requirement it only counts as 50% or 2,350 lbs with my 4,700 lb WLL chains. Could they have made it more complicated? So, I put a bunch of chains on the rear of the grader (especially since it had wheels) and made sure chains were going from one side of the trailer to the other - through the 'eyes' on the frame of the machine. If you looked at the grader from the back, it looked like I had 20 chains in there :) So, ow do you calculate how many chains to put on a machine like this? Weight: 33,600 lbs. Length: 28 ft. Height: close to 10 ft.[ATTACH=CONFIG]626[/ATTACH] |
I remember before you got your step you were talking about pulling a grader. Looks like you found one. Below is a cut and paste from the FMCSA rule book.
Minimum Working Load Limit for Cargo Securement Devices and Systems The aggregate working load limit of any securement system used to secure an article or group of articles against movement must be at least one-half the weight of the article or group of articles. The aggregate working load limit is the sum of: One-half the working load limit of each tiedown that goes from an anchor point on the vehicle to an attachment point on an article of cargo; and The working load limit for each tiedown that goes from an anchor point on the vehicle, through, over or around the cargo and then attaches to another anchor point on the vehicle. |
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If the chains are shorter and you need to run them from tie down lugs to the trailer, you would need 7 chains. As far as the g force requirements are concerned, I can tell you the DOT guys don't go into it that deep. We've moved literally hundreds of pieces of equipment and we've been ticketed once. The driver drove the 10,000 lb tractor fwd until it touched the drop of the step deck, then set the parking brake and secured it with one chain across the hitch at the rear of the tractor. DOT cop pulled him over on the 401 in Whitby and fined him. |
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It's not a matter of how many chains, it's a matter of do you have chains that are properly sized.
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So to calculate your grader: Weight of 33,600 Four tiedowns using direct method 33,600 / 4 = 8400 WLL Would be legal if you used four tiedowns of 7/16" or 1/2" chain. Or double each corner with 3/8" chain. Of course your securement points and binders have to be rated above this as well. In Canada you cannot use 5/16 chain for any heavy wheeled vehicle, the WLL must be above 5000 lbs for any tiedown(5/16 is rated for only 4700 lbs). That's why I say it's the size of the chain that matters, not how many. On my trailer the tiedowns are only rated for 6600 lbs, even though it isn't stated on the trailer. So I'd need to use 8 3/8" chains minimum for that grader. |
Rank do you ever use the indirect tiedown method with heavy wheeled/tracked vehicles? I don't think I've ever seen that. All the RGN stuff we do it's always 4 big chains one at each corner using direct method.
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Have at it tracer:
USA: Part 393.100: Which types of commercial motor vehicles are subject to the cargo securement standards of this subpart, and what general requirements apply? - Federal Motor Carrier Safety Administration 393.100 through 393.136 Canada: http://www.ccmta.ca/english/committe...2010_Final.pdf |
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From reading his post (properly, the 2nd time) I gather Tracer has 5/16" chain. |
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I need some 3/8 chain as well. |
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