I am in process of calculating depressurization rate for condensate dehydrator. LPG condensate composition as follows: Component Mole. Dear all I have to simulate a depressurization of a plant gas working at 69 barg ( Pdesign=74 barg) with Hysys. I know that I have to do 2. HYSYS Depressurisation Example – Free download as PDF File .pdf), Text File . txt) or read online for free. Depressurization Hysys.

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PSV hysterysis can be modelled by clicking on the Sub flowsheet template for the depressuring utility and navigating to the Specs Dynamics Tab as shown. Lowered temperature even negative is expected. Pressure, temperature depressurizatiom flow profiles are calculated for the application of an external heat source to a vessel, piping or combination of items.

Download Now Defense manufacturing is all about project manufacturing and project accounting. The user may husys a maximum number of iterations and a pressure tolerance to improve convergence.

Depressurization By Hysys

Alternatively, if a C3 value of 1 was used, the volume would vary proportionally with the liquid volume. The user can specify orifice area or diameterrelief pressure and full open pressure.

It should be used when the valve throat area is known. To use a set of fixed U values, the “Use Fixed U” option should be selected.

User shall take note that there is a possibility where initial depressurization will be in critical flow condition and towards the end, backpressure may be exceeded the critical pressure. A higher efficiency results in a lower final temperature.


An initial liquid volume of 6m3 and a wetted area of m2 were given. The valve parameter page is basically to define the characteristic and vapor flow equation of depressuring device. The total vessel volume is calculated depressurizwtion the diameter and height or length for a horizontal vessel. Once the utility has run, users can go to the “Performance” “Summary” page to view the results.

This means that all material in the vessel has been flashed together and is in thermodynamic equilibrium. It is divided into three sections: In this case, the phases may have different temperatures.

HYSYS Depressurization – Aspen Technology products – Eng-Tips

Red Flag This Post Please let us know here why this post is inappropriate. Download Now White Paper: The final pressure is given when the Depressuring Time has elapsed. Total wetted surface depgessurization calculated up to 7. It is possible to remove variables by deselecting the appropriate variable in the “Active” column.

Attaching the stream to the utility is accomplished as shown in the view Press the arrow and select the inlet stream from the drop-down list. This equation may be used in non-controlled depressuring system and it is for critical flow condition where backpressure is lower than system pressure.

Depressurisation: A Practical Guide HYSYS | PEDRO DIAZ –

HYSYS does not take account of the heads in a vessel so volumes and areas are calculated as for a simple depressurziation. To view data in graphical To view data in form, press the “View Strip tabular form, press Chart…” button.

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This could be a significant cost impact to the project. Correlation Coefficients This feature gives users the opportunity to manipulate the coefficients used in the heat transfer correlation. The only parameters user required to input are the orifice Discharge Deprewsurization Cd and Orifice area A. Enter your search terms Submit search form.

File Library Check out the latest downloads available in the File Library. For non-controlled depressuring system, other equations such as [Relief], [Supersonic], [Subsonic] and [General] may be used.

Once selected always rename the Utility to something that is recognisable the next time you open the case. As a practical consideration, in real world applications the cooling could be so great that specialized metallurgy low temperature carbon steel or stainless steel would be required because of the possibility of metal embrittlement. Total System Volume If the feed stream is two-phase, the equilibrium composition of the liquid will be calculated.

This is the desired final pressure. I guess the main issue here is to provide the discharge coefficient Kd for orifice. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

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