ALLOWABLE SHAPE DEVIATION IN A PRESSURIZED CYLINDER

Presence of initial shape imperfection causes additional bending stres ses to be developed in a pressurized cylinder. Although the bending st ress will initially increase with pressure, it will finally settle dow n to a certain value. This article derives the maximum bending stress associated with the geometric shape imperfection. It also discusses th e implication of this additional bending stress on the design stress a nd allowable shape tolerance. Finally, it is concluded that a 1-percen t diametral deviation, as commonly specified by most design codes, is adequate and sound for the internally pressurized cylinder.