The results of a series of experiments conducted on reinforced plastic matrix pipes show how the peak stresses, occurring in the saddle support region, can be reduced in magnitude by certain design features. Two methods are found of value: (1) to use a flexible medium, such as PVC or rubber, between the saddle and pipe, and (2) to support the pipe on a saddle with a radius greater than the pipe radius. The experimental results are compared with an analytical approach using shell theory making the assumption that the pipe material is isotropic. The agreement between the experimental and analytical results is promising.
Get full access to this article
View all access options for this article.
References
1.
RoarkR. J.YoungW. C.Formulas for stress and strain, Fifth Edition, 1975 (McGraw-Hill, New York).
2.
BS 5500: 1976, Specification for unfired fusion welded pressure vessels1976, Appendix G (British Standards Institution).
3.
WilsonJ. D.ToothA. S.‘The support of unstiffened cylindrical vessels’ 2nd International Conf., Pressure Vessel Technology, ASME 1973, pp. 67–83.
4.
ToothA. S.WilsonJ. D.‘A study of the saddle stresses arising from the support of a cylindrical vessel’, Strain1980, 16, 103–111.
5.
ZickL. P.‘Stresses in large horizontal cylindrical pressure vessels on two saddle supports’Welding J., Research Supplement, 1951, 30, 435-S–445-S.
6.
KŘUpkaV.‘An analysis for lug or saddle-supported cylindrical pressure vessels’, 1st Int. Conf. on Pressure Tech., Delft, 1969.
7.
ForbesP. D.ToothA. S.‘An analysis for twin supported unstiffened cylindrical vessels’ Conf. on Recent Advances in Stress Analysis, Royal Aero Soc. London, March 1968, pp. 47–58.
8.
DuthieG.ToothA. S.‘The analysis of horizontal vessels supported by saddles welded to the vessel - a comparison of theory and experiment’ 3rd Int. Conf. on Pressure Vessel Tech., Tokyo 1977, pp. 25–38.
9.
ToothA. S.DuthieG.‘The elastic analysis of horizontal cylindrical vessels supported by saddles’ Euromech 136, Warsaw, Oct. 1980. To be published in Achiwum Badowy Maszyn.
