For do depressurization calculation with hysys, I’m accustomed to specify a coefficient of discharge of 0.62 for calculate the restriction orifice (RO) diameter needed for satisfy the design constrain, e.g. reach 6.9 barg in 15 min. This value of the coefficient of discharge is coherent with the suggested value in API 520 I for a rupture disk to which a depressurization orifice can be assimilated and to Fig. 10-16 of Perry 8th Ed. Chap. 11. In a recent discussion with a RO vendor, he sustain that the correct coefficient of discharge for chocked flow is according to Miller 0.83932 (see attachment) resulting in a sensible reduction of RO diameter respect to the calculation with coefficient of discharge 0.62. Please share your opinion and experiences about.
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