Chapter 10. Relief Sizing
Relief sizing calculations are performed to determine the vent area of the relief device.
The relief sizing calculation procedure involves, first, using an appropriate source model to determine the rate of material release through the relief device (see Chapter 4) and, second, using an appropriate equation based on fundamental hydrodynamic principles to determine the relief device vent area.
The relief vent area calculation depends on the type of flow (liquid, vapor, or two-phase) and the type of relief device (spring or rupture disc).
In Chapter 9 we showed that for liquids and two-phase relief, the relieving process begins at the relief set pressure with the pressure normally continuing to rise past the set pressure ...
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