Limit pressures have been calculated for the case of two identical flush neighbouring radial nozzles in a spherical pressure vessel. The nozzle and vessel radius and thickness have been kept fixed, but the separation angle 2α has been varied. Four cases have been analysed, including that where the nozzles touch, and the results compared to the value for a single nozzle. For these nozzles very little decrease occurred for any of the α. The effect of displacement on pressure carrying capacity was also investigated and shown to be beneficial, so that limit pressure results may be used with confidence.
RobinsonM.GillS. S.Limit analysis of flush radial and oblique cylindrical nozzles in spherical pressure vessels: Part 1: A parametric survey of results. Int. J. Pressure Vessels and Piping, 1973, 1, 199–231.
2.
Naderan-TahanK.Stress analysis of spherical shells with one and/or two neighbouring nozzles under internal pressure and external loadings by finite element method: a parametric survey. PhD thesis, Mechanical Engineering Department, UMIST, 1989.
3.
Naderan-TahanK.Stress concentration factor in spherical vessel with single radial nozzle by finite element method: a parametric survey. Proceedings of the Second Annual Conference of the Iranian Society of Mechanical Engineers (ISME), 2–5 April 1994, Vol. 1, pp. 27–33.
