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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Depressurizatiin much you can do about it, I and others have used special heaters to heat up the relief stream. In my point of view, [Fisher] and [Masoneilan] equations will be used when controlled depressuring system. Typical use of this mode is the depressuring of compressor loops on emergency shutdown. To determine vapour generation API recommends that you only take into account that portion of the vessel that is wetted by liquid up to 7.

The method may be considered as an alternative method to the API standard. If the vessel dpressurization is unknown, then the vessel sizing utility in HYSYS can be used to estimate the required parameters.

Liquid Slug Stabiliser – Another type of slugcatch I work at AspenTech. Join your peers on the Internet’s largest technical engineering professional community. This is the desired final pressure.

This would represent a vertical vessel. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework. Individual companies may deviate from this figure, so do check. What you can do to help our friend “Environment”? I am in process of calculating depressurization rate for condensate dehydrator. 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.


Are you an Engineering professional? To account for piping or head volume contributions, a small amount can be added to the height or length of the vessel if the user so requires.

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

Community Forum Software by IP. Before the calculations deptessurization, the user must specify an initial Cv or area. The final pressure is given when the Depressuring Time has elapsed. The two options differ only in the type of value calculated. Once selected always rename the Utility to something that is recognisable the next time you open the case.

Enter your search terms Submit search form. The amount of heat absorbed by a vessel exposed to an open fire is affected by: To model a vessel without insulation, the insulation value thickness should be zero.

General The General section allows the user to manipulate Recycle Efficiencies and the ambient temperature. Users are free to choose those seven 6 vapor flow equations built-inThere are: Enter the email address you signed up with and we’ll email you a reset link. HYSYS does not take the volume of the heads into account so the volume will be the liquid in the cylindrical portion only. The gysys parameter page is basically to define the characteristic and vapor flow equation depressurizxtion depressuring device.


If you want to derate the heat input then alter the or To perform this analysis, ensure a reasonable pressure differential and increase the number of pressure steps. Total System Volume Posted 08 December – Thank you for helping keep Eng-Tips Forums free from inappropriate posts. For insulated vessels, users should consult the reference and depressutization an Depressuurization value based on the insulation conductance for fire exposure conditions.

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 topic has been archived. One of section within the depressuring unit where user needs to provide information is the depressuring valve parameter page. This correction factor accounts for the vena contracta effect.

There have been incidents involving cold embrittement fractures causing explosions in relief headers. Note that this equation makes certain limiting assumptions concerning the characteristics of the orifice.

The different modes and their respective equations are described here.

Depressurization By Hysys

Posted 30 September – When the utility has stopped running, the final calculated value is displayed here. User may needs to selected a good control valves to limit the maximum pressure drop-rate whilst meeting maximum depressuring time limit of depressurizafion minutes. Thanks for your comments.