Reproductive accuracy of safety valve two-phase mass flow capacity models in case of air/water, resp., viscous liquid flow duty

On the basis of integral statistical key figures, the reproductive quality of the Extended Maximum Disequilibrium Method as proposed by Wieczorek ?] is in the range of the liquid phase viscosity of up to 2800 mPa?s in comparison with that exhibited by the models according to ISO/CD 4126-10 ?], Lenzing ?], Leung ?], Gosslau and Weyl ?], resp., Fauske ?] higher and in parallel so far unique to achieve under all conditions an oversizing of the relief area. This result is partially offset by a comparatively higher average uncertainty, resp., larger relief area oversizing in the range of viscosities of up to 100 mPa?s. The apportionment of the integral statistical figures as a function of the stagnation air mass quality shows that most of the methods – independently of the liquid viscosity level – feature the largest deviations, resp., oversizing in the range of mass flow qualities between 0.1 and 1%. This is unfortunately just the discharge mass flow quality used in sizing in case of partially liquid loaded reactor top venting.