CLASSIC APPLICATION OF THEORY OF PLATES AND SHELLS IN PRESSURE VESSELS （II） A- NALYSIS ON EIGHT STRENGTH CALCULA- TION METHODS FOR SHELLS OF PRESSURE VESSELS （PART I ） [1]Sang Rubao ,Xia Shaoqing ,Yan Dongsheng （ SI- NOPEC Engineering Incorporation, Beijing , 100101） Abstract： GB 150 and GB/T 151 are two leading standards for design and fabrication of pressure vessels, in which calculation methods for eight types of pressurized shells and four types of tube sheets are listed. Calculation formulae for these components are derived from elastic analysis for theory of plates and shells.