FLOW COMPUTER TIP OF THE WEEK – TP-15 P100 Correlation

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Published Aug 3, 2023

Flow Computer Tip of the Week – What is the TP-15 P100 correlation? When setting up products in a Flow-X computer, you may have run across the parameters for setting the Vapor Pressure Mode and the TP-15 P100 correlation and wondered “What is this?”. 1st, the Vapor Pressure mode is the method to determine the vapor pressure (equilibrium pressure). There are 4 possible settings in the Flow-X.

1: Override value -The ‘Vapor pressure override value’ is used for the calculation of the CPL value.

2: Standard – The vapor pressure is calculated in accordance with the density conversion method Vapor pressure calculation is supported for NGL/LPG (GPA_TP15, GPA STD 8117), ethylene (API 11.3.2.1, IUPAC, NIST1045, API 2565) and propylene (API 11.3.3.2)

3: Antoine equation exponential – The vapor pressure is calculated using the Antoine equation in exponential form in metric units:

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4: Antoine equation NIST – The vapor pressure is calculated using the Antoine equation as it is used in the NIST Standard Reference Database in metric units:

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The TP-15 P100 correlation settings are only applicable to NGL/LPG. The TP-15 P100 correlation controls whether the basic or the improved GPA TP-15 correlation is applied for calculating the equilibrium pressure (vapor pressure). If this setting is Disabled, the basic correlation is used for pure products such as propane, butane and natural gasoline. It only requires the relative density and the temperature to calculate the equilibrium pressure. The improved correlation requires the vapor pressure at 100°F. When Enabled, this method is better suited for varied NGL mixes, where different product mixes could have the same specific gravity but different equilibrium pressure. This also requires the user to enter the Vapor pressure at 100F.

For more information on this topic or ANY FLOW COMPUTER related questions email us at FCEXPERTS@CRT.SERVICES

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