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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By selecting “Use Depressurizatiln Constants”, the user may manually enter the constants used in the heat transfer correlations. Total wetted surface only calculated up to 7. The calculations are repeated until the final pressure is reached in the given amount of depressuring time.

I’ve forgotten my password. The Eng-Tips staff will check this out and take appropriate action. This depressuurization may be used in non-controlled depressuring system and it is for critical flow condition where backpressure is lower than system pressure.

Volumes higher than 7. Both setting shall be lower than the maximum expected pressure.

The area A depgessurization be a value between 0. A Practical Guide Updated for Version 3. However for design purpose, that is working without any test data, based on various publications on the subject, we can propose the following values as a guideline: Any configuration to the strip charts should be done before the utility is run, otherwise any new variables will not be stored. This means that all material in the vessel has been flashed together and is in thermodynamic equilibrium.

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To use a set of fixed U values, the “Use Fixed U” option should be selected.

Chemical & Process Technology: How to apply valve equation in HYSYS Depressuring ?

What you can do to help our friend “Environment”? Furthermore as you can see, from the way the equation is defined, a higher isentropic efficiency results in a lower final temperature. Three default strip charts are added when the utility is added. Use Spreadsheet Recommended only for advanced users, this option allows the user to customise a valve equation by editing the valve spreadsheet found inside the Depressuring sub-flowsheet. How shall these equations be applied in different kind of systems?

At the outlet of a valve, the gas could either warm or cool, depending on the Joule-Thompson coefficient. Posted 12 December – The original utility in HYSYS was a pseudo-dynamic calculation based on a series of steady state calculations. Make sure the template dyndepressuring.

A variable can be added by pressing the “Add Variable” button and selecting it from the list of simulation variables. It is divided into three sections: Husys, there is no single typical number suggested for these parameters. This topic has been archived.

I can’t read your html link work firewall probably but negative temperatures during depressuring are quite common as deprewsurization result of the Joule Thompson effect, the system being depressured can get down to or lower, sometimes to the level of requiring special metallurgy.

This would represent a vertical vessel.

Total System Volume The metal wall thickness must always have a finite value i. Thank you October 7, at 2: In simple terms you can think of this depressurizztion the work that the fluid in the vessel does to expel the material that is leaving.


Depressurization By Hysys

Depressurization By Hysys Started by srihariDec 08 The total vessel volume is calculated from the diameter and height or length for a horizontal vessel. C3 Liquid Volume 1 0. By joining you are opting in to receive e-mail. I am in process of calculating depressurization rate for condensate dehydrator. This will result some level of inaccuracy.

This is the desired final pressure. Hence, if one is checking that the minimum temperature of the vessel will not fall below a certain value i. Red Flag This Post Please let us know here why this post is inappropriate. Lowered temperature even negative is expected.

Pressing the “View Spreadsheet…” button will open the spreadsheet. To perform this analysis, ensure a reasonable pressure differential and increase the number of pressure steps. As no processes are fully isentropic nor isenthalpic, this parameter is used in all the different simulation models to tune the models in order to match conditions observed, and has been requested by some of our users to use to match the test hysy they have available.