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API STD 520, Annex C_Sizing for Two-phase liquid / vapor relief ¿¡¼
w (Omega) = 9 *(v9 / v0 - 1)
Where, v9 is the specific volume evaluated at 90% of the PRV inlet pressure, P0 in ft3/lb; when determining v9, the flash calculation should be carried out isentropically, but an isenthalpic (adiabatic) flash is sufficient for low-quality mixtures far from the thermodynamic critical point.
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