Factor A and B shell thickness Factor A and B shell thickness lcatg (Mechanical) (OP) 1 Jul 17 12:20 Hi, to calculate shell thickness under external pressure, ASME formula has two factors A and B. What actually these factors represent? Do they indicate any property? http://files.engineering.com/getfile.aspx?folder=839be158-609d-4b2b-b182-96 RE: Factor A and B shell thickness SnTMan (Mechanical) 3 Jul 17 16:02 lingeshgdvg, I refer you to ASME Sec II, Part D, Mandatory Appendix 3 for a full discussion, but paraphrasing from the same, briefly, and imprecisely : Factor A is a geometry based factor, relations between thickness, diameter and length as applicable. It is independent of material. Factor B is a material based factor and represents stress-stain data. This dependent on Factor A (geometry) and temperature. Factor B is used in calculation of the allowable external pressure. Regards, Mike The problem with sloppy work is that the supply FAR EXCEEDS the demand RE: Factor A and B shell thickness lcatg (Mechanical) (OP) 4 Jul 17 04:46 Thanks a lot SnTMan. By refering the source,parts everything clearly you opened up a new chapter to learn for me. Its really helpful..