Flash Calculations Back to Main Tutorial

The following steps will guide you to do a flash calculation using SRK equation of state. You will work with screen 5A in the Volume 1.

Step 1: Go to the Volume 1 and Select Chapter 5

Step 2: Select “A. Bubble point; dew point, and flash calculations (SRK EOS)”

You should see screen 5A appears. There are 5 options: Bubble point at known pressure and temperature, Dew point at known pressure and temperature, and flash at specified pressure and temperature. You can only select one option at a time. The default option is flash calculation. Please notice that inputting gas composition is required. You can enter mole % or mole flow rate for each component, depending on your Input Mode (Preferences\ Input Mode).

Step 3: Specify the temperature and pressure. Notice that you can change the units of temperature and pressure.

Step 4: Input the Gas Compositions (mole%). The Total flow rate is optional in this case. If you do not specify the total flow rate, 100 lbmole/hr will be used as the default flow rate.

Step 5: Click the “Run” Button to start the flash calculation.

*If you click the “Feed” button, GCAP displays the information (Temperature, Pressure, gas composition in mole percent or gas mole flow rate depending on input mode, and total flow rate if available) of the feed stream in the latest flash calculation.

*If you click the “Vapor” button, GCAP displays the information (T, P, gas composition in mole percent or gas mole flow rate depending on input mode, and total flow rate if available) of the vapor stream from the latest flash calculation.

*If you click the “Liquid” button, GCAP displays the information (T, P, gas composition in mole percent or gas mole flow rate depending on input mode, and total flow rate if available) of the liquid stream from the latest flash calculation.

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