Evaluation of Longitudinal and Hoop Stresses and a Critical Study of Factor of Safety (FoS) in Design of a Glass-Fiber Pressure Vessel

Authors: Zainul Huda, Muhammad Hani Ajani

Abstract:

The design, manufacture, and operation of thin-walled pressure vessels must be based on maximum safe operating pressure and an adequate factor of safety (FoS). This research paper first reports experimental evaluation of longitudinal and hoops stresses based on working pressure as well as maximum pressure; and then includes a critical study of factor of safety (FoS) in the design of a glass fiber pressure vessel. Experimental work involved the use of measuring instruments and the readings from pressure gauges. Design calculations involved the computations of design stress and FoS; the latter was based on breaking strength of 55 MPa for the glass fiber (pressure-vessel material). The experimentally determined FoS value has been critically compared with the general FoS allowed in the design of glass fiber pressure vessels.

Keywords: Thin-walled pressure vessel, hoop stress, longitudinal stress, factor of safety (FoS), fiberglass.

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1338082

References:

[1] L. Pamas and Katirice; Design of fiber-reinforced composite pressure vessels under various loading conditions; Composite Structures, Volume 58, Issue 1, October 2002, Pages 83–95.
[2] Brabin, T. A., Christopher, T., Rao, B.N. (2011); Bursting pressure of mild steel cylindrical vessels, International Journal of Pressure Vessels and Piping, Volume 88, Issues 2–3, February–March 2011, Pages 119– 122
[3] H. Poor, An Introduction to Signal Detection and Estimation. New York: Springer-Verlag, 1985, ch. 4.
[4] Huda, Z., Bulpett, R. Lee, Y.K. (2010); Design against Fracture and Failure, Trans Tech Publications, Switzerland
[5] Internet Source: www.fiberglassafi.com
[6] Internet Source: www.waterhill.com
[7] Internet Source: http://www.watertechonline.com/articles/choosing-theright- fiberglass-pressure-vessels