In my garage i need maximum load to lift with chain block is 3 ton at center of 6.3meter long beam, beam size?

Question

In my garage i need maximum load to lift with chain block is 3 ton at center of 6.3meter long beam, my existing beam (size is 128mm) unable to lift 3 ton load, so advise which size of beam i can use.

Thanks

Answer 1

Not sure what you are asking.  I am not engineer, but you need a wide flange beam.  3 tons is a lot of weight.  For a 7 meter beam, I would think at  least 250+ with at least 100 flange.  Also, like a chain, your rigging is only as good as the weakest link.  Floor to top and back to the load!

Answer 2

How is anybody suppose to know what kind of beam you're talking about? 128mm could be referring to anything from a 1/2" thick steel ibeam to a wodden 2x6.

Hanging 3 tons from a 20 foot long beam would require at least an 8" 3/8" thick ibeam. Smaller beams would be strong enough, but they'd flex too mucxh and pull the ends in.