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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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The best option would be to try various scenarios and observe the results. This value is calculated using the vessel dimensions specified on the “Connections” page. Download Now Defense manufacturing is all about project manufacturing and project accounting. A higher efficiency results in a lower final temperature.

If you want to derate the heat input then alter the or Depressurization study is one of the mandatory studies in oil and gas for long time. Not much you can do about it, I and others have used special heaters to heat up the relief stream. 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.

Total wetted surface only calculated up to 7. It is possible to model a depressuring valve using the PSV valve. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework. 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. This depends on fluid inventory, initial conditions and mass of metal involved, someties the fluid will get very cold, but the mass of metal is large enough that the metal itself cannot physcially get that cold.


There have been incidents involving cold embrittement fractures causing explosions in relief headers. The calculations are repeated until the final pressure is reached in the given amount of depressuring time. No external heat is applied so no parameters need to be entered in this section. If you have a single vessel, for example, the stream would be the feed stream into the vessel.

Correction Factors allow for adjustments to the amount of metal in contact with the top or bottom of the vessel. Values ranging from 0.

Search Advanced Search section: Individual companies may deviate from this figure, so do check. To do this you will have to force the relief valve to be open at all times. This topic has been archived. A more realistic hold up time to use is 4 minutes. This could represent a worst case scenario. Husys initial liquid volume is normally calculated at the normal liquid level NLL. Lowered temperature even negative is expected. Posted hysya September – Click here to sign up.

I guess the main issue here is to provide the discharge coefficient Kd for orifice.

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

Red Flag This Post Please let us know here why this post is inappropriate. Hence, if one is checking that the minimum temperature of the vessel will not fall below a certain value i. C3 Liquid Volume 1 0. Thank you October 7, at 2: This will result some level of inaccuracy. If the conditions of the system at settle out are such that the vapour is superheated, HYSYS will not allow a liquid inventory. 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.


Promoting, selling, recruiting, coursework and thesis posting is forbidden. Sign In Need an account? Any configuration to the strip charts should be done before the utility is run, otherwise any new variables will not be stored. Thank you very much for this summary.

Depressurization By Hysys Started by srihariDec 08 Post a Comment Let us know your opinion!!! It’s easy to join and it’s free.

Depressurization By Hysys

In simple terms you can think of this as the work that the fluid in the vessel does to expel the material that is leaving. The discharge coefficient Cd should be a value between 0 and hysyys.

Heat flux into the fluid is user defined using the following equation: This is very unlikely event and generally it is ignored. The metal wall thickness must always have depressurziation finite value i. This can occur when the upstream pressure is less than twice the backpressure. Press the “Run” button to start the calculations. Users are also required to enter the specific heat capacity of the material sthe density of the material s and the conductivity of the material s.

Students Click Here Join Us! As a practical consideration, in real world applications the cooling could be so great that specialized metallurgy depressurizaton temperature carbon steel or stainless steel would be required because of the possibility of metal embrittlement.

Alternatively, if a C3 value of 1 was used, the volume would vary proportionally with the liquid volume.