Some observations on the calculation of stresses due to local loads on cylindrical shells using BS 5500, Appendix G

The application of the BS 5500 Appendix G method of calculating stresses due to radial load and moments on rectangular areas on cylindrical shells is quite complex. A parametric survey attempting to simplify the calculations showed that:

1. (i) The limitations on the geometrical parameters required for the validity of the Appendix G method put considerable restrictions on the range of applicability of the method.

2. (ii) The method of calculation of stresses due to a circumferential moment leads to anomalies associated with the neglect of stresses caused by loads on the second loaded area.

3. (iii) For longitudinal moment on a rectangular area offset from the mid-length of the vessel, Appendix G requires a calculation of different effective lengths for the two loaded areas but this refinement does not appear to be necessary.

4. (iv) Some experimentally measured stresses are compared with the predictions of the Appendix G method which is shown to be conservative except for one series of tests.

References

1.M.A. Teixeira, R.D. McLeish and S.S. Gill, A simplified approach to calculating stresses due to radial loads and moments applied to branches in cylindrical pressure vessels (Calculations to BS 5500, Appendix G), Journal of Strain Analysis 16 (4) (1981), pp. 217–226. View Record in Scopus | Cited By in Scopus (0)2.Unfired fusion welded pressure vessels, BS 5500, British Standards Institution (1976).3.B.S. Banning, Private communication to British Standards Institution (February, 1981).4.R. Bedri, Stress concentration factors for local loads on cylindrical shells, MSc Dissertation, Faculty of Technology, University of Manchester (January, 1982).5.R. Kitching, Review of the methods of calculating stresses due to local loads and local attachments of pressure vessels, BSI PD 6439 (Nov., 1969).6.K.R. Wichman, A.G. Hopper and J.L. Mershon, Local stresses in spherical and cylindrical shells, Weld. Res. C. Bull. No. 107 (1965).7.E.T. Cranch and J.W. Dally, An experimental study of attachments to cylindrical and shallow cylindrical shells, nuclear reactor containment buildings and pressure vessels, Butterworths, London (1960), p. 221.8.R. Kitching, J.F. Hughes and N. Jones, Limit loading of cylindrical shells subjected to local circumferential bending moments, I.J.M.S. 20 (1978), p. 61. Abstract | PDF (1045 K) | View Record in Scopus | Cited By in Scopus (2)9.J.F. Hughes, Local loading of pad reinforced cylindrical shell through a bracket, PhD Thesis, Faculty of Technology, University of Manchester (1976).10.D. Hussain, Limit loading of a cylindrical shell subjected to longitudinal bending moments, MSc Dissertation, Faculty of Technology, University of Manchester (1966).11.A.L. Tan, Behaviour of cylindrical shell with longitudinal plate bracket attachment, MSc Dissertation, Faculty of Technology, University of Manchester (July, 1976).12.N. Gregory, Local loads applied to cylindrical shells through long rectangular attachments, MSc Dissertation, Faculty of Technology, University of Manchester (October, 1972).13.J. Pringhipakis, Stresses in pad reinforced, cylindrical shell with circumferential bracket attachment, MSc Dissertation, Faculty of Technology, University of Manchester (November, 1976).