SWL to secure engine onto a flatbed trailer

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SUMMARY

The discussion centers on securing a 7826 kg engine and steel transport stand onto a wooden flatbed trailer using SWL (Safe Working Load) chain blocks. The manufacturer specifies that the securing arrangement must withstand a force of 1.8G. It is concluded that four 3.2 tonne SWL chain blocks are insufficient; instead, eight chains with a 3.2 tonne tension are recommended to ensure safety, particularly when accounting for potential forces during transport. A suggestion to double the SWL to 6.5 tonnes for added security is also made.

PREREQUISITES
  • Understanding of Safe Working Load (SWL) principles
  • Knowledge of load securing techniques
  • Familiarity with forces acting on loads during transport
  • Basic physics concepts, including friction coefficients
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  • Research load securing regulations and best practices for transporting heavy machinery
  • Learn about calculating forces and safety factors in load securing
  • Explore different types of chain blocks and their specifications
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Transport engineers, logistics professionals, and anyone involved in securing heavy loads for transportation will benefit from this discussion.

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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