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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This topic has been archived. Close this window and log in. This equation may be used in non-controlled depressuring system and it is for critical flow condition where backpressure is lower than system pressure.

Liquid Slug Stabiliser – Another type of slugcatch The area A should be a value between 0. Out of 6 vapor flow equations, which equation shall be chosen and applied? The best option would be to try various scenarios and observe the results. The different modes and their respective equations are described here. In most cases, C1 will be equal to A higher isentropic efficiency results in a lower depressruization temperature.

HYSYS Depressurization – Aspen Technology products – Eng-Tips

Enter your search terms Submit search form. The metal wall thickness must always have a finite value i. 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 data they have available.

Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework. No doubt these equations are established and well accepted by many users. The calculations are repeated until the deprressurization pressure is reached in the given amount of depressuring time. Personally there may be some document out there which has recommended what type of Kd factor to be used. Depressurization By Hysys Started by srihariDec 08 Posted 08 December – Help Center Find new research papers in: If the conditions of the system at settle out are such that the vapour is superheated, HYSYS will not allow a liquid inventory.


Posted 12 December – The following table is an example showing how the C3 term affects the wetted area calculation. Volumes higher than 7. To use a set of fixed U values, the “Use Fixed U” option should be selected. This usually refers to ground level but it can be any level capable of sustaining a pool fire.

Press the “Run” button to start the calculations. By pressing the “Size Valve”, the valve can be sized for a given flow rate. What you can do to help our friend “Environment”? This would represent a vertical vessel. This will result some level of inaccuracy.

Both setting shall be lower than the maximum expected pressure. In most cases, either the Fisher or the Relief valve should be used for valve sizing. User may needs to selected a good control valves to limit the maximum pressure drop-rate whilst meeting maximum depressuring time limit of 15 minutes. No external heat is applied so no parameters need to be entered in this section.

As dfpressurization 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. This means that all material in the vessel has been flashed together and is in thermodynamic equilibrium. The time step size refers to the integration step size.

Furthermore as you can see, from the way the equation is defined, a higher isentropic efficiency results in a lower final temperature. It may be a good idea to reduce the step size if the flow jysys is significantly larger than the volume or if the vessel depressurises in a relatively short amount of timesay 1 minute.


Defense manufacturing is all about project manufacturing and project accounting.

Depressurization By Hysys

Dperessurization my point of view, [Fisher] and [Masoneilan] equations will be used when controlled depressuring system. You can now view the recording for the webinar: HYSYS will use the heat content of this metal when performing the calculations.

Common controlled depressuring application are depressuring of compressor depressurization Mole-Sieve bed. To perform this analysis, ensure a depressurizqtion pressure differential and increase the number of pressure steps. Remember me This is not recommended for shared computers. This mode has three sub-types: It is possible to remove variables by deselecting the appropriate variable in the “Active” column. The two options differ only in the type of value calculated. It allows the user to specify both valve Cv and percent opening.

Enter the email address you signed up with and we’ll email you a reset link. I can’t read your html link work firewall probably but negative temperatures during depressuring are quite common as a result of the Joule Thompson effect, the system being depressured can get down to or lower, sometimes to the level of requiring special metallurgy. HYSYS does not take account of the heads in a vessel so volumes and areas are calculated as for a simple cylinder.