Tow safety chains on Scamp - Page 2 - Fiberglass RV


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Old 02-20-2014, 04:49 PM   #15
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Twisting the chain will take up the slack in the chain.
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Old 02-20-2014, 05:20 PM   #16
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I was of the understanding that twisting the chains will have a negative impact on their strength and puts extra stress on the chain when under full load should the tongue end up being cradled by them after a disconnect. Was taught it was better to have the chains shorten to the correct length.
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Old 02-20-2014, 06:38 PM   #17
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Far to much stuff being discussed about a simple item that would take a mechanical engineer and metallurgist to figure out in a laboratory.

Get a chain large enough to hold the camper attached to the tow vehicle and forgetaboutit.
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Old 02-20-2014, 07:11 PM   #18
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I got this chain off a shipwreck on the beach. Won't break this one.
And it only adds sixty pounds to the tongue weight!?
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Old 02-21-2014, 04:15 AM   #19
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I was shown to twist up chains to shorten for towing. . Right or wrong, I'm not so sure that the chains on my Scamp is up to the job. The factory chains look to light. But since I'm using a Anderson hitch I'd bet they will hold it on/ up. I'm not a SME on chains or anything for that matter, I was shown use of chains in work in oilfield before I was in Army. Later in life not to trust shock loading chains or cable/ wire rope. I've seen end results of them failing. I do remember a few in oilfield work missing body parts
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Old 02-22-2014, 08:46 AM   #20
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I was of the understanding that twisting the chains will have a negative impact on their strength and puts extra stress on the chain when under full load should the tongue end up being cradled by them after a disconnect. Was taught it was better to have the chains shorten to the correct length.

You understood correctly. They should never be twisted.
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Old 02-22-2014, 09:48 AM   #21
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You understood correctly. They should never be twisted.
Thanks Jared glad to hear I am not the only one here who thought that. I worked in operations on deep sea vessels and I know the longshore personal considered it a no no to twist chain on ships cargo lifting frames as well.
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Old 02-22-2014, 12:48 PM   #22
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Contrary to Private Messages about to be received by folks in this thread :

Dead load lifting etc. is completely different from any scenario associated with safety chains.

Twisting to shorten is SOP on rental/fleet trailers that are towed by many different vehicles- as witness the following quote from U-Haul, presumably very expert in the field.

Quote:
Control slack by hooking the chain back to itself or by twisting the links to shorten chain.
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Old 02-22-2014, 02:01 PM   #23
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If I were towing an Army Tank on a flat bed behind my 1974 VW Thing then I would B worried about having the right safety chain but towing a fiberglass egg, I would trust what Francess found out from UHaul
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Old 02-22-2014, 02:44 PM   #24
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Contrary to Private Messages about to be received by folks in this thread :

.
Sorry I didn't get one!
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Old 02-22-2014, 03:45 PM   #25
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I now know not to tow any ships behind my trailer.
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Old 02-22-2014, 05:39 PM   #26
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LOL While in the case of many of our trailers there may not be enough weight involved to create enough jerk force during the disconnect to be an issues in regards to chain strength.

But as I have no idea as to what the chains on my trailer are rated for in the first place and as its pretty well document that twisting chains will weaken their strength and its pretty simple to have them adjusted to the correct length, I figure its worth the minor inconvenience of getting them set to correct length.
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Old 02-22-2014, 05:52 PM   #27
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........snippety snip snip.........
its pretty well document that twisting chains will weaken their strength
Now, you know we're not lettin' you get off without your showing the "well documentation" as applies to safety chain degradation/failure.

The schoolyard rules under which we operate here apply:

I showed you mine, now you have to show me yours! ...;
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Old 02-22-2014, 06:42 PM   #28
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Originally Posted by Francesca Knowles View Post
Now, you know we're not lettin' you get off without your showing the "well documentation" as applies to safety chain degradation/failure.

The schoolyard rules under which we operate here apply:

I showed you mine, now you have to show me yours! ...;
LOL Francesca you sure you really want to go here???

First off please note I used the word "weaken" not the others you mentioned

Here is a very quick look at what just a few companies that make chains have to say on the topic:

From the Peerless Industrial Group - Cautions and Warnings - Safety Check List: "Check #4 -Knots, Twists & Kinks Make sure chain is not twisted, knotted or kinked before lifting load. Slings should not be shortened with knots, bolts or other make-shift devices."

From Whitelaw Rigging and Fabrication: Allow Chain sling instructions. Reads in part: "General Usage - Certain factors in the use of lifting chain and attachments can be abusive and reduce the load that the chain or attachments can support. Some examples are twisting the chain......."

From Suncorstanless.com Chain Use : "Use slings with the proper reach (length). Never shorten a sling by knotting it, twisting, or with fasteners such as nuts and bolts. Lifting a load with twisted or knotted chains can impose loads in excess of rated capacity or spin the load dangerously."

If you google it I am sure you will find many other manufactures with the same advise and probable a more detailed explanation of the whys and how comes if you feel you require it.

Will leave the last word with both our governments: US Department of Labor - Safe Sling Use - under the section of Alloy Steel Chain Slings -Rigging Practices "Avoid twisting and kinking".


Canadian Centre for Occupational Health and Safety: Materials Handling - Chain Safety - What you should avoid when using chain Slings "Do not shorten a chain with knots or by twisting other than by means of an integral chain clutch"

Hope thats school yard enough of an explanation for you
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