Nonlinear analysis method can improve pipeline design
- Gulf Interstate Engineering, Houston, TX (United States)
A nonlinear engineering method for analyzing pipe stress criteria has been developed and can be used in common spreadsheet software for pipeline design. Designs based on this method can enhance the operational reliability of pipeline systems because their designs can more accurately determine actual pipe stress and strain. Most pipeline design codes establish allowable equivalent-stress limits that are higher than the pipe steel`s proportional limit (the linear relationship between stress and strain). The limit is approximately 70% of the specified minimum yield strength (SMYS). Therefore, consideration of the nonlinear mechanical properties of the material is reasonable in pipeline stress analysis. The nonlinear, numerical engineering method proposed is based on small elastic-plastic deformation theories and design data for materials used to manufacture pipe according to industry specifications. The method allows for elastic plastic concepts to be easily incorporated in pipeline design. In some cases, this method allows the pipe`s design wall thickness to be reduced; in other cases, an increase in the temperature differential can be tolerated. This method can also be used for calculating the rigidity characteristics of the pipe. The results may be used in pipeline system analysis and such design programs as TRIFLEX or CAESAR.
- OSTI ID:
- 211900
- Journal Information:
- Oil and Gas Journal, Vol. 94, Issue 13; Other Information: PBD: 25 Mar 1996
- Country of Publication:
- United States
- Language:
- English
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