Numerical and Experimental Analysis of Stress and Strains in Flat Ends of High-Pressure Vessels

Abstract:

Application of flat welded ends with stress relief grooves in high-pressure vessels is a common alternative to use of dished vessel ends. It is well established and follows calculation rules given in codes: EN-12952-3 [1], EN-13445-3 [2], or in ASME code [3]. However the calculation rules do not give any definite answer what should be the choice of parameters defining a circular stress relief groove, for example, position of the groove and its radius. Usually the choice of them relies on engineering practice. The present paper clearly shows the influence of this choice on stress concentration in the cylinder-endplate junction area. The results of numerical study are verified in experimental investigations performed for a cylindrical high-pressure vessel.

• Periodical: Key Engineering Materials (Volume 490)
• Pages: 226-236
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.490.226
• Online since: September 2011
• Authors: Bogdan Szybiński, Paweł Romanowicz, Andrzej P. Zieliński
• Keywords: Experimental Analysis, Finite Element Method (FEM), Flat Ends, Pressure Vessel Steel, Stress Relief Groove

References

[1] British-Adopted European Standard EN-12952-3:2001, Water-tube boilers and auxiliary installations. Design and calculation of pressure parts, May-2002.

DOI: 10.3403/02574723

[2] European Standard EN-13445-3:2202, Unfired pressure vessels – Part 3: Design, May-2002.

[3] Companion Guide to the ASME Boiler and Pressure Vessel Code, K.R. Rao (Ed.), ASME Press New York, 2006.

DOI: 10.1115/1.802183

[4] R. Preiss, Stress concentration factors of flat end to cylindrical shell connection with a fillet or stress relive groove subject to internal pressure, Int. J. Press. Vessel and Piping, 73 (1997) 183-190.

DOI: 10.1016/s0308-0161(97)00067-7

[5] R. Preiss, F. Rauscher, D. Vazda, J.L. Zeman, The flat end to cylindrical shell connection – limit load and creep design, Int. J. Press. Vessel and Piping, 75 (1998) 715–726.

DOI: 10.1016/s0308-0161(97)00104-x

[6] T. Vilhelmsen, Reference stress solutions of flat end to cylindrical shell connection and comparison with design stresses predicted by codes, Int. J. Press. Vessel and Piping, 77 (2000) 35–39.

DOI: 10.1016/s0308-0161(98)00132-x

[7] S. Łaczek, J. Ryś, A.P. Zieliński, Load capacity of thick-walled cylinder with radial hole, Int. J. Press. Vessel and Piping, 87 (2010) 433-439.

DOI: 10.1016/j.ijpvp.2010.07.009

[8] G. Widłak, Local shakedown analysis of thick-walled reactor subject to mechanical and thermal loads,PhD Thesis (supervisor A.P. Zieliński), Cracow Univ. of Technology, 2010.

[9] M. Mrzygłód, A.P. Zieliński, Low-cycle fatigue constraints in two-stage structural optimization of a nozzle to pressure vessel connection, T. Burczynski, J. Periaux (Eds.), CIMNE Barcelona, 2009.

[10] B. Szybiński, A. Trojnacki, Experimental verification of strength calculations of high-pressure metal B-type sealing (in Polish), submitted to Mechanical Review (2010).

[11] P. Pedersen, Suggested benchmarks for shape optimisation for minimum stress concentration, Struct. Multidsciplinary Optim. 35 (2008), 273-283.

DOI: 10.1007/s00158-007-0148-9

[12] B. Szybiński, A. Wróblewski, Parametric optimisation of stress relief groove shape in flat ends of boilers, submitted to Journal of Strain Analysis for Eng. Design (2011).

DOI: 10.1177/0309324711421719

[13] ANSYS, ver.12.0 for research and educational purposes. Swanson Analysis Systems, 2010.

[14] Information on http://www.hbm.com.