Abstract
In this paper the design of a spherical pressure vessel pierced by a radial cylindrical nozzle is discussed. The nozzles considered end flush with the inside of the vessel. Previous work on stress concentration factors, shakedown factors and limit pressure factors has been drawn together and presented in a compact form convenient for the use of designers. These results have been used to discuss the implications of designing to a certain stress concentration factor and to show that this procedure is very reasonable when a concentration factor of 2.25 is used.