Investigation of back pressure of safety valve

Abstract

In this paper the back pressure of direct spring loaded safety valves were studied at different blow-down cases. The examined system was described and the different blow-down cases were specified. For back pressure calculation detailed calculation method was described. Results of the calculation were shown on figures and on tables. Simulation method for determining back pressure was also described. Calculated and simulated back pressure values were compared with each other and the results converged very well to each other. The value of the back pressures were higher than 10% of the set pressure in every cases which is not allowed for this type of safety valves. Proposal was given for the stable operation of the safety valve.