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Design Innovation

Design Formulas of Blind End Closures for High Pressure Vessels

[+] Author and Article Information
R. D. Dixon, E. H. Perez

 E. I. DuPont de Nemours and Company, Wilmington, DE 19880-0036

J. Pressure Vessel Technol 131(3), 035001 (Feb 11, 2009) (6 pages) doi:10.1115/1.2967886 History: Received October 18, 2006; Revised July 17, 2007; Published February 11, 2009

The available design formulas for flat heads and blind end closures in the ASME Code, Section VIII, Divisions 1 and 2 are based on bending theory and do not apply to the design of thick flat heads used in the design of high pressure vessels. This paper presents new design formulas for thickness requirements and determination of peak stresses and stress distributions for fatigue and fracture mechanics analyses in thick blind ends. The use of these proposed design formulas provide a more accurate determination of the required thickness and fatigue life of blind ends. The proposed design formulas are given in terms of the yield strength of the material and address the fatigue strength at the location of the maximum stress concentration factor. Introduction of these new formulas in a nonmandatory appendix of Section VIII, Division 3 is recommended after committee approval.

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Copyright © 2009 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Typical finite element mesh

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Figure 2

Typical finite element stress intensity contour

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Figure 3

Blind end and cylindrical shell stress intensities

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Figure 4

Corner radius stress intensity concentration factors

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Figure 5

Corner radius maximum and intermediate principal stress concentration factors

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Figure 6

Normalized maximum principal stress distributions

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