annular plate definition
By Doug Stelling. The annular plate-to-shell junction is one of the most critical areas in an API 650 Tank, and is one of the most difficult areas in which to assess corrosion. The annular plate typically rests on a crushed stone or concrete ring wall, and joins the highly stressed shell of the tank to the bottom plates. The bottom plates are for the most part supported by the tank pad or foundation, and are lowly stressed.