Updated : Oct 26, 2019 in Photos


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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Users yhsys also required to enter the specific heat capacity of the material sthe density of the material s and the conductivity of the material s. 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.

This can also be used to account for additional nozzles, piping, strapping or support depressurizwtion in close contact with the vessel. HYSYS does not take the volume of the heads into account so the volume will be the liquid in the cylindrical portion only. A Practical Guide Updated for Version 3. Enter the email address you signed up with and we’ll email hysyw a reset link.

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. Values ranging from 0.

Depressurisation: A Practical Guide HYSYS | PEDRO DIAZ –

Remember me This is not recommended for shared computers. The user is required also to specify an orifice discharge coefficient. Lowered temperature even negative is expected. Furthermore, these two valve types support other options that can be accessed through the valve property view accessible through the Depressuring sub-flowsheet.

The calculations are repeated until the final pressure is reached in the given amount of depressuring time. Thank you October 7, at 2: Probably it is necessary to take particular assumptions for each software.


This may be disproportionate to the total vessel volume. This mode has three sub-types: Click Here to join Eng-Tips and talk with other members! If you want to derate the heat input then alter the or depressurizatkon Both setting shall be lower depressurizaton the maximum expected pressure.

What you can do to help our friend “Environment”? If you have a single vessel, for example, the stream would be the feed stream into the vessel.

Depressurization study is one of the mandatory studies in oil and gas for long time. To do this enter a full open pressure that is lower than the final expected vessel pressure and a set pressure that is slightly lower than the full open pressure. If the depressuring time is reached before the final pressure is achieved, then the calculations stop and a new Cv or area is calculated using the final pressure.

Entering Vessel Parameters Ideally, the vessel size will be known and this data can be entered into the appropriate fields on the form shown above. This is analogous to adding, for example, ten percent to the vessel mass to account for fittings. Posted 11 December – This is very unlikely event and generally depressurisation is ignored. This value is calculated using the vessel dimensions specified on the “Connections” page.

No depressurizaation these equations are established and well accepted by many users. Note that this equation makes certain limiting assumptions concerning the characteristics of the orifice.

By selecting “Use Specified Constants”, the user may manually enter the constants used in the heat transfer correlations. Sign In Need an account? Unfortunately, there is no single typical number suggested for these parameters. Skip to main content.


Furthermore as you can see, from the way the equation is defined, a higher isentropic efficiency results depressurizzation a lower final temperature. Thanks for your comments.

It is possible to remove variables by deselecting the appropriate variable in the “Active” depressurizahion.

Depressurization By Hysys

The discharge coefficient Cd should be a value between 0 and 1. Featured Articles Check out the latest featured articles.

Digital Transformation may be defined in a number of different ways by analysts or enterprise software vendors. This means that you cannot reply to this topic. If depressuriztaion of user aware of it, please share in the comments column.

For non-controlled depressuring system, other equations such as [Relief], [Supersonic], [Subsonic] hyssy [General] may be used. I guess the main issue here is to provide the discharge coefficient Kd for orifice. Depresdurization model a vessel without insulation, the insulation value thickness should be zero. In most cases, either the Fisher or the Relief valve should be used for valve sizing.

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. General The General section allows the user to manipulate Recycle Efficiencies and the ambient temperature.

In order to disregard this effect, set the discharge coefficient equal to 1. If the feed stream is two-phase, the equilibrium composition of the liquid will be calculated. I work at AspenTech. It should be used when the valve throat area is known. Depressurization By Hysys Started by srihariDec 08 Thank you very much for this summary. Remember me on this computer.