SWL to secure engine onto a flatbed trailer

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The discussion focuses on the adequacy of securing an engine weighing 7826 kgs on a wooden flatbed trailer using four 3.2 tonne SWL chain blocks. The manufacturer requires the securing arrangement to withstand a force of 1.8G. To meet this requirement, calculations suggest that eight chains with a 3.2 tonne tension are necessary, ideally positioned at angles between 35° and 80°. Some participants express concerns that the current SWL may be insufficient and recommend increasing it to 6.5 tonnes for better safety. Ensuring proper securing methods is crucial for safe transport.
porkypete51
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Hi I'm need to check if the securing arrangements for a load are adequate...

Weight of engine and steel transport stand - 7826 kgs

secured to a wooden flat bed trailer by 4, 3.2 tonne SWL chain blocks (1 at each corner)

maunfacturer states that the securing arrangement must withstand a force of 1.8G

is a SWL of 3.2 tonne sufficient for each of the chain blocks? trailer would be traveling no more than 30 km/h around bends

many thanks
 
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Although I'm not an expert on the subject, assuming a friction coefficient of 0.4 (wood on steel) and that the chains are solidly attached to the load (such that they can take horizontal load as well), if you want to respect the 1.8 G limit (which you should, as your trailer can experience at least 0.75 G, up to 0.9 G, so that's a safety factor of 2), you would need 8 chains with a 3.2 tonne tension (2 on each sides, preferably). The angle of the chains with respect to the horizontal being between 35° and 80°.
 
Thanks, Jack

I thought the safe working load was a bit too low,

I'll just recommend to double it with 4 chains to a SWL of 6.5 tonnes
 

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