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Look out for our fortnightly "Software Tip" which provides some useful tips that could potentially
save you time and produce unexpected results at your fingertips. Contest details below.

Tip 4: Accurate Hydrate Utility Based On Multiflash Technology


Would you like to seamlessly perform accurate hydrate formation and inhibition calculations within the process simulator without accessing third party PVT software?


Petro-SIM is natively integrated with Infochem Multiflash™ technology which contains comprehensive mechanisms for PVT and physical property prediction. The Cubic Plus Association (CPA) - Infochem model which is in Petro-SIM 6.0 basis environment includes parameters to accurately describe the effect of thermodynamic hydrate inhibitors on hydrate formation and the partitioning of the inhibitor between aqueous, gas and oil phases. With valid MSU, you are entitled to upgrade to our latest version and enjoy this new feature. Please contact KBC ( for an upgrade if you have not done so already.


Selecting the CPA model

  1. Select the Multiflash property package by clicking  Basis on the Home tab of the ribbon bar in Petro-SIM.
  2. Select the CPA (Multiflash) property package and close the window.

  3. Alternatively, users may directly import the fluid from a saved Multiflash (.mfl) file which must be saved with the hydrate model.

Evaluating the results in the material stream

  1. Under Conditions, ensure that the Fluid Package is the same Fluid Package containing the CPA property package. The stream below is operating below the hydrate curve. Subsequently, the Hydrate II phase is indicated besides vapour and liquid phases.

  2. Under Compositions, the partitioning of the individual components to the respective phases is shown.

  3. Under Properties, click  to append a new property.

  4. From the Property Picker, select the properties to be shown.

    • Hydrate Formation Flag

      • If the hydrate phase exists, the flag will return a value of 1. If no hydrate exists, the flag will return a value of 0

    • Hydrate Formation P at stream T

      • The lowest pressure before hydrates will form at the current stream temperature
    • Hydrate Formation T at stream P

      • The lowest temperature before hydrates will form at the current stream pressure
    • Hydrate Inhibitor Required

      • The amount of methanol required to prevent hydrate formation

 Plotting the phase diagram

  1. Right Click on the stream, click Send To then Lab Analysis to generate the phase diagram of the stream. The phase diagram is plotted based on the CPA model.

We will be checking on how well you do by asking some simple questions in June. Three lucky winners will be picked and receive KBC exclusive gifts. Do keep a look out for our periodic email.

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