I just wanted a quick discussion on the input of Tank Bottom Plate diameter and Annular Plate measurement. My main question is: are these supposed to overlap in the model? Under bottom plate entry it asks for the "Internal diameter" dimension. Then under the Anchor window it asks for the Annular plate dimension, which, in the sketch beside the data entry it says that this length can extend past the internal diameter of the tank?
In my picture below if I enter the Annular plate dimension as 84 and internal diameter dimension for the bottom plate as 4572 i get an error for the annular plate being too small?
So how are we best to model this situation?
Actually your annular plate should extend beyond the shell inside the tank as pictured below ( just an informative picture , you actually have to calculate the width of the annular plate by API 650 ):
As for the picture of the anchorage of the bentley vessel , i think it's a generic picture meant more for the cone skirt and i think it should look more like this :