A new method for the development of external pressure charts
- Hartford Steam Boiler Inspection and Insurance Co., Hartford, CT (United States). Codes and Standards Dept.
External pressure charts are used by various Sections of the ASME Boiler and Pressure Vessel and Piping Codes to design components such as cylinders, spheres, formed heads, tubes, pipings and other components, subjected to external pressure or axial compression loads. These charts are contained in Section 2, Part D, Subpart 3 of the Boiler and Pressure Vessel Code and are pseudo stress-strain curves for groups of materials with similar stress-strain shapes and strength levels. Historical background is provided on the traditional graphical method used to develop these charts, which was originally developed in the 1930`s. This paper presents a new method to develop external pressure charts using mathematical relationships for the material stress-strain curves and a mathematical formulation for the complete procedure. The new method improves the accuracy of the development of external pressure charts and takes advantage of the improvements in testing techniques which today provide digital data in addition to graphical information. A number of issues that introduced variabilities in the traditional graphical method are discussed in detail. The method also leads to the development of master material external pressure charts which could increase the allowable buckling strength of numerous material in the code. In addition it provides for the capability to extend the external pressure charts for higher temperatures. The new method has been applied successfully to several new materials adopted recently for code construction.
- OSTI ID:
- 136839
- Report Number(s):
- CONF-950740--; ISBN 0-7918-1344-4
- Country of Publication:
- United States
- Language:
- English
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