API 650_Polygon shape for Bottom plate

[nabeel3]

Hello Seniors,
According to API 650 Section 5" The ring of annular Plates shall have a circular outside circumference, but may have a regular polygon shape inside the tank shell, with number of sides equal to the number of annular plates." is this clause(number of sides equal to the number of annular plates) mandatory for sketch plates also ?

 

[Geoff13]

Sketch plates usually have a radiused edge. I've never seen anything else.

 

[HTURKAK]

Sometimes "One picture is worth a thousand words".
Just write ( annular, bottom , sketch plates ) and search the web. One of the outcomes,