Lifting Lug Repad Square Root Rule?

[NEBarkley]

Is there a "square root rule" in an industry standard or Sec. VIII concerning the dimensions at which it is no longer necessary to keep making a repad larger for a lifting lug to reduce the stress in the repad edge to shell weld. For example, say I have a 10" x 1" lug and the loadings on the lug require a 24" x 15" repad to meet the allowable stress. Is there a square root rule that specifies a length in each direction at which the stress on the repad edge weld can be ignored?

In normal situations where such a large repad is required, I would normally just use a trunnion design; however, trunnions are not applicable here since rotation is required around the vessel's center axis.

Thank you in advance for your response.

 

[GenB]

No sq. Root can accurate give the required strength' we now use what is called software there you can use a large part or smaller with calculated re-pad.....

 

[SnTMan]

NEBarkley, I expect you are looking for something like this: thread794-247794

Regards,

Mike