Housing is Back 01: Architekten Beziehen Position zum by Prof. Peter Ebner (eds.)

By Prof. Peter Ebner (eds.)

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9 PHASE EQUILIBRIUM A basic representation of the equilibrium information for a specific fluid composition can be found in a P-H (pressure-enthalpy) diagram, which is highly dependent on the sample composition. This diagram can be used to investigate thermodynamic fluid properties as well as their thermodynamic phenomena, such as retrograde condensation and the Joule-Thomson effect. Please note, however, that a P-H diagram is likely to be available only for a single component of the mixture unless the diagram is created by simulation software packages such as those mentioned above.

In most oil-field applications the convergence pressure is between 2000 and 3000 psia, except at very low pressures, where a psia between 500 and 1500 is possible. If the operating pressure is much less than the convergence pressure, the equilibrium constant is not greatly affected by the choice of convergence pressure. Therefore, using a convergence pressure of 2000 psia is a good first approximation for most flash calculations. 13 “K” values for propane. Courtesy of GPSA Engineering Data Book.

Therefore, if one tests at 150%, then one can still use the “2/3 rule” to determine if tube rupture is a credible scenario. ” Increasing the low-pressure side design pressure will have little impact on the likelihood Heat Transfer Theory 45 of a tube rupture. However, by raising the low-pressure side design pressure to a point where the low-pressure side test pressure is equivalent to the highpressure side design pressure ensures that damage to the exchanger due to a tube rupture is extremely unlikely.

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