Only for the purpose for Lifting lugs, I have to put an Insert plate in the Shell Barrels.
Can anyone help me in defining the dimensions of the insert plate. I wanted to know upto what extent around the lugs the lifting load shall be acting.
Can it be modelled in PV-Elite or Code Calc?

regards

Maroof

This is very first case, I have seen where for lifting purpose, insert plate is placed by designer. Once again check the design if same is really reaquired.

There is no perfect way to define insert plate dimensions for lifting lug. You have to check from fabrication point of view and that will be best way to put insert plate for the case.

Thanks.

Mukesh

Maroof,
You can always use reinforcing pads!
gr2vessels

Hi,

Actually I had already checked the Lifting Lug Pad for WRC Analysis and it was failing in the same. To clear the lifting lug I had to increase the thickness of the shell. It wouldnt have been advisable to completely replace a shell barrel of certain thickness just for the sole purpose of lifting only which only would have been say once in 10 - 15 years. Hence i have tried to use an Insert plate. I wanted to know how to specify the dimensions for the same since the forces will be acting only locally and not complete on the vessel.

regards,

Maroof

In WRC or lifting lug analysis, you should only specify the load on one lug. Did you check it?

If you use insert plate it should long enough to cover the area of high stress, like a width of 1.65*(R*t)^.5 (from either WRC-368/297). Then have a taper to reduce stress concentration.