Dear friends
I have a question about the methods of designing pressure vessels by using ASME PBVC Code. As we know there are two methods for designing a pressure vessels, "Design by Rules" as stated in ASME VIII-I and "Design by Analysis" as stated in ASME VIII-II. At first I want to know that are these methods independent from each other and is it possible to use both of them in same time? Another question is about the level of stress analysis used for each method.The first sentence of Moss's handbook is "In general, pressure vessels designed in accordance with the ASME Code, Section VIII, Division 1, are designed by rules and do not require a detailed evaluation of all stresses." So, what does he mean by "do not require a detailed evaluation of all stresses"? We know Section VIII, Division 1 provides formulas for thickness and stress of basic components. Are they enough in evaluation of stressed needed for all loads and load combinations? or we have to use other formulas in other handbooks for stress analysis? for example WRC 107 method for the nozzles subjected to external loads. Formulas provided in WRC 107 are used in "detailed evaluation of all stresses" or not? and how can we use such methods of stress evalutioan in each method and devision of ASME Code? For example is it possible to use FEM in evaluation of stresses in ASME VIII-I? or we shall use FEM method just in ASME VIII-II?