Two-Phase Flow Standard Sizes

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Two-Phase Flow
There are no precise formulas for calculating orifice area for twophase flow. The common convention is to calculate the area required for the gas flow as if there were no liquid present and the area required for
the liquid flow as if there were no gas present. The two areas are then added to approximate the area required for two-phase flow.

Standard Sizes
Relief valves are most often sold using the standard orifice sizes shown in Table 13-3. Once a required area is calculated from the applicable formulas, the next larger standard orifice size is specified.

 Two Phase Flow Standard Sizes

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