Dear Mariog,
Most of the things are clear. Thank you so much!.

But I am still confused about 0,035D limitation.

Wa(force resisting uplift in annular region) affects on J, it is calculated by using annular plate thickness and minimum specified yield strength of annular plate.
L does not affect on J. ( if we do not use it smaller than Lmin ( E.6.2.1.1-2a))
There is a restriction that L need not be greater than 0,035D. But why it is declared as 0,035D why not 0,05D or something else. Unfortunately I am curious about it. Because I do not believe that, Increasement in width(I mean "L") should not be affect negatively on tank overturning. It should not be required anchorage.

If I am wrong, please advise.

Thank you.

Best Regards