The Main Effect of Design Variables for a Safety Valve on a Fracture Pressure


Article Preview

The safety valve has been designed to protect high pressure vessels. A fracture plate made of a circular thin plate is located within the safety valve. The circular thin plate has an outlet for fluid release and to help decrease the pressure. As such, fracture of the circular thin plate can occur at the appointed pressure. In this study, design variables of the safety valve were used to control fracture pressure so that it was easy to apply in the development of a new model of a safety valve. Design variables were fluid diameter of the safety valve, thickness of the fracture plate, filet radius of the clamping bolt, fracture pressure, and clamped torque of the clamping bolt. Design variables were selected, since the fracture experiment indicated that these variables might play a critical role in the fracture of the circular thin plate. Fracture pressure was calculated by the finite element analysis method and analyzed to affect the design variables on the fracture pressure. Using regression analysis, main design variables such as the fluid diameter, the thickness and the fillet were selected and the relationships of the variables were expressed by a regression equation. Furthermore, finite element analysis method and the regression equation were verified comparing with the experiment result.



Key Engineering Materials (Volumes 345-346)

Edited by:

S.W. Nam, Y.W. Chang, S.B. Lee and N.J. Kim




S. W. Lee et al., "The Main Effect of Design Variables for a Safety Valve on a Fracture Pressure", Key Engineering Materials, Vols. 345-346, pp. 1581-1584, 2007

Online since:

August 2007




[1] Stephen, P., Timoshenko, S. Krieger, W.: Theory of Plates and Shells second edition, McGRaW-HILL (1959).

[2] Fratini, L., Ambrogio, G., Lorenzo, R. Di, Filice, L., Micari, F.: Influence of mechanical properties of the sheet material on formability in single point incremental forming, Annals of the CIRP, 53/1: 207-210 (2004).


[3] Duram, D., Von Turkovich, B.F., Assempoor, A.: Modeling the frictional boundary condition in material deformation, Annals of the CIRP, 40/1: 235-238.


[4] Lee, Y.W., Woertz, J.C., Wierzbicki, T. S.: Fracture prediction of thin plates under hemi-spherical punch with calibration and experimental verification, International Journal of Mechanical Sciences, ELSEVIER, 46: 751-781 (2004).


[5] Lee, S. W., Shin, D. Y.: A study on prediction of fracture pressure of circular thin plate, Proceedings of the KSME 2006 Spring Annual Meeting, 335 (2006).

[6] Kaebernick, H., Sun, M., Kara, S.: Simplified Lifecycle Assessment for the Early Design Stages of Industrial Products, Annals of the CIRP, 52/1: 25-28 (2003).


[7] Mason, R.D., Lind, D.A., Marchal, W.G., 1983, STATISTICS, HARCOURT BRACE JOVANOVICH (1983).