Abstract: According to the classic force theory, the bend stress theory of resolving joint of cone and cylinder is established. On the basis, the intensity problem which the shell of cone connected with the cylinder is researched systemically. Regarding as if controlled value of the meridional bend stress is 3[s]tf , the controlled curve is associated with the codes of the standard of Chinese present pressure vessel, GB150—1998. But it is showed that some parameters such as the shell of conical di-mension, for example, the half degree of conical angle(a), the ratio of the vessel radius to wall thinkness(r/d1), the ratio of conical wall thinckness to the cylindrical wall thinckness (t ) are influenced on the cylindrical intensity much more than the conical. The paper studied the circumferential intensity of cone, analyzed in details the rules which circumferential intensity changes, according to the shell’s dimension facts and so on. A series of controlled curve and related curve which are related to the parameters of the shell of conical dimension and design ways which can ensure that the circumferential stress is less than or equal to 3[s]tf are presented.

Key words: Intensity, Pressure vessel, Shell of cone, Stress