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Problem Statement: What is a Calculator variable? | Solution: Calculator variables are a means to access stream property correlations in Aspen HYSYS from the object navigator window.
By default, all streams in Aspen HYSYS will have a standard set of properties displayed. In addition to this default list, further correlations such as Gas properties (HC Dew Point, Water... |
Problem Statement: What is the diffference between saving a case to an XML file from Save As and exporting the case as XML? | Solution: There is no difference between the two methods if you don't change any default when you export it via Simulation menu.
Keywords: XML, export, save
References: None |
Problem Statement: It is desired to simulate a vessel in Hysys, dynamic mode. This vessel has 2 outlet streams (top and bottom) and under normal operation 3 phases (vapor, light liquid and heavy liquid). The outlet streams are calculated according to phase levels and nozzle positions/diameters. For instance, if the hea... | Solution: The workaround to simulate this process is to use the Spreadsheet to calculate the new position of the nozzle, so that the amount of each liquid phase in the outlet stream is equal to the amount of each phase in the combined liquid stored in the hold-up. The nozzle position is calculated by the equation:
h = ... |
Problem Statement: How does Aspen HYSYS use the Stage Overall / Component Efficiencies I enter? | Solution: The stage efficiency used is a modified Murphree stage efficiency, the equation is as follows:
En = (Vn*yn - Vn+1*yn+1) / (Vn*Kn*xn - Vn+1*yn+1)
Where:
E = efficiency
Vn = total vapour molar flow leaving stage n (if the stage has a side vapour draw then this is included)
y = vapour mole fraction
x = liquid ... |
Problem Statement: What do I do to have a different Valve Type than the standard HYSYS ones? | Solution: If you have a different valve type than the standard HYSYS ones, you can manipulate the HYSYS linear valve to behave like your valve. This can be done by using a spreadsheet. You can send the controller signal to the spreadsheet and have it calculate the equivalent linear valve opening for you. Alternatively,... |
Problem Statement: How to set an isentropic flash and see the effect on the Pressure | Solution: For achieving this you can add an expander or a compressor and set the polytropic efficiency to 99.99% and the adiabatic efficiency will be calculated. You can specify only one efficiency, either adiabatic or polytropic. If you specify one efficiency and aSolution is obtained, HYSYS back calculates the other ... |
Problem Statement: What is Improved in Aspen HYSYS V7.3 - HYSYS Physical Properties | Solution: Aspen HYSYS V7.3 includes a number of improvements in the HYSYS physical property methods and the Simulation Basis.
New Binary Parameters for the SRK Property Package
Twenty additional pairs of binary parameters for the SRK property package were added in V7.3. The additional binary pairs are listed below:
M... |
Problem Statement: The cold property utility reports strange values for the RON (Research Octane Number). For example, a stream with 90% isooctane, 9.9% n-heptane, and 0.1% benzene reports a RON of around 35, while the actual RON should be around 90. | Solution: The cold property utility in HYSYS calculates the RON based on a proprietary correlation, and is valid for systems with a D86 50% < 220 C (SeeSolution document 109286).
The cold property utility is only recommended for use with straight run gasoline's and light naphthas and is therefore not suitable for the... |
Problem Statement: The insulation thickness cannot be modified when the detailed heat loss model of a pipe segment is selected. | Solution: Fortunately, based on the definition of thermal resistance (Equation 1) and the formula to calculate the insulation mass (Equation 2), aSolution to this limitation can be formulated.
(Equation 1)
where Rins is the insulation thermal resistance
Dx is the insulation thickness
Do is the pipe outer diameter
kin... |
Problem Statement: What method is used by Grayson-Streed Thermodynamic model to calculate Liquid Density? | Solution: Hysys uses COSTALD Method to calculate Liquid density for Grayson-Streed package.
There is no option to switch to another Liquid density model hence no other estimation method for Liquid density estimation can be selected.
Keywords: Grayson-Streed, COSTALD, Liquid density
References: None |
Problem Statement: How do I set the default version when I have more than one Aspen HYSYS version installed on my PC? | Solution: For any Aspen HYSYS - Excel automation work it is necessary to set the desired Aspen HYSYS version as the default version if there are more than one Aspen HYSYS version installed on the PC. Any Aspen HYSYS version can be registered and unregistered manually. To make this simple a command line script file can ... |
Problem Statement: How can I place a group of unit ops into a new sub-flowsheet? | Solution: Use the following approach:
Using your mouse, select the items you wish to place into the new sub-flowsheet.
Press the right mouse button.
Select Cut/Paste Object -> Combine Into Sub-flowsheet.
If your selected objects contain another subflowsheet, you will be asked whether or not you would like a new subflow... |
Problem Statement: How to keep open the workbook and spreadsheet or any two windows inside a HYSYS file side by side?
For drag and drop purpose, I need two windows side by side. They one hides once the other is open is open. How can I keep them side by side? | Solution: It can be done in three ways.
Method # 1: Go to Window menu and select the two objects, one at a time. This way you can bring the two already opened object windows to the front view of the Aspen HYSYS desktop. The following picture shows an example.
Method # 2: If one of the two windows needs one click ... |
Problem Statement: Why is the Wobbe index displayed in my stream different than the one in the Gas Properties Extension? | Solution: The difference you see is due to the two different reference temperatures being used. In the Gas Properties extension (seeSolution 110060), the Wobbe index is calculated at 15C. For the Wobbe index of the stream the value can be calculated at 0C or 15C. To select the reference temperature at which the Wobbe i... |
Problem Statement: I get different results when using Beggs and Brill (1979) and Beggs and Brill (1973) flow correlation | Solution: The original Beggs and Brill model (1973) was developed for smooth pipes. As a result, the pressure drop predicted by this correlation does not depend on the roughness (because the friction factor is that of smooth pipes.) The improvements made in the 1979 model were to include the roughness in the friction p... |
Problem Statement: What does the error message Not licensed for Crude Distillation (Distillation of high NBP hypothetical components) mean? | Solution: The license which enables operation of the Aspen HYSYS application controls the options/features a user has access to. One of them is the Crude option. Without the Crude option set on the key, simulations are limited in the number of components which can be included if running a column in the case such as Not... |
Problem Statement: Where can I find my own extensions in Windows XP Registry table? | Solution: You should be able to find your extension at the following key for HYSYS V7.3:
HKey_Local_Machine\Software\Classes\Software\hyprotech\Hysys\1.7\extension.
You also can find the extensions registering in other Hysys versions: 1.6 for V7.2, 1.5 for V7.1 and so on.
Keywords: Registry table, extension, HYSYS
Re... |
Problem Statement: Can I generate hydrate curve using Infochem Multiflash property package in Aspen HYSYS? | Solution: The answer is NO. The Infochem Multiflash package in Aspen HYSYS does not support hydrate calculation . The menu Select/Model set/Hydrates form is locked. User can make hydrates calculation within Infochem Multiflash itself (i.e., standalone), but not when it is called from Aspen HYSYS.
The Infochem features ... |
Problem Statement: Aspen HYSYS V7.3 and earlier has a performance slider in bottom right-hand corner of the gray pane. We set this from the default Auto-Calculate to Max. Where can I find this feature on Aspen HYSYS V8?
Does this feature have equivalence with the Aspen HYSYS V8 calculation speed? | Solution: On HYSYS V7.3 and earlier, the Calculation/Responsiveness icon enables user to control how much time is spent updating the screen vs calculations, i.e. there is no equivalence with calculation speed.
The performance slider is no longer present in Aspen HYSYS V8 GUI. The change of architecture to the WPF d... |
Problem Statement: What is the purpose of the Lock Create Mode button in the Object Palette in Aspen HYSYS? | Solution: This mode is entered by clicking on the Lock icon in the Object Palette.
This allows you to add multiple objects (of the same type either Streams or Unit Operations) to the PFD without having to return to the palette everytime.
Please note that after adding required number of objects to the PFD, you will ne... |
Problem Statement: Where is the API Gravity property located in HYSYS? | Solution: API Gravity may be displayed in the Stream Properties view. To change the Mass Density property to API units you must first clone your existing unit set and then change the mass density units to API. The conversion is completed automatically. The path is: Tools|Preferences|Variables. Then click on the Clone b... |
Problem Statement: When attempting to run the pipe segment, Aspen HYSYS displays the error The requested pressure drop function could not be found. Check to ensure presdropcorr.dll is available. | Solution: The error is displayed when two required dll's (LIBIFCOREMD.dll, LIBMMD.dll) are missing from the system. These files were not released in the 2006 installation DVDs; therefore they were not copied to the system during Aspen HYSYS installation.
To resolve this problem, download the enclosed zip file (which ... |
Problem Statement: The Column Cut Point (ASTM D86) spec does not match the results in Boiling Point Curves Utility. | Solution: Users need to define all Assays with the same D86-TBP Interconversion method (Assay property view, Calculation Defaults tab, Conversion Methods group).
The Oil Output Settings (accessed via the Oil Characterization property view) also need to be changed to the same method as this is used to make the conversi... |
Problem Statement: How can I use ACX with HYSYS? | Solution: In order to use ACX with HYSYS, you must have ACX installed and running on your machine. Then, create a new file, and go to Select, Import HYSYS Exchanger, and choose the exchanger you want from the drop down list. The exchanger you want must be a simple cooler, not an air cooler.
Keywords:
References: None |
Problem Statement: Can I plot more than one variable after running a case study? | Solution: It is possible to specify which variables are to be plotted by activating the appropriate variables on the Display Properties pagetab of the Case Studies setup form.
Note that a maximum of two variables can be plotted on a graph at the same time.
Keywords: databook, case, study, 3D, plot
References: None |
Problem Statement: What does the Use Initialization File option do? | Solution: Use Initialize File: When this box is checked, a SAV file is used as initial estimates for the MASS solver. The SAV file is created upon pressing the Create Initial File button on the Connections page (only for when the Solving Mode is Sequential Modular). Checking this option can aid in the convergence of ca... |
Problem Statement: Will unit operation | Solution: tolerances have an impact on my optimization problem?SolutionSolution tolerances on unit operations such as recycles, columns, and heat exchangers should be tightened to minimize any potential noise in the Jacobian.
If tolerances chosen are too loose, there is a very real possibility that they will interfere ... |
Problem Statement: How Can I Convert The HYSYS Enthalpy to the HYSIM Enthalpy Basis? | Solution: Although the HYSYS enthalpy reference basis cannot be modified internally, the conversion of an absolute enthalpy value generated by HYSYS to a different basis such as HYSIM can be performed using the output from HYSYS. The offset between the HYSYS and HYSIM enthalpy reference basis for a given component is p... |
Problem Statement: The molecular weight, viscosity or density of my oil stream does not match my data. How do I fix it? | Solution: As you supply more information to Aspen HYSYS, the accuracy of the Oil Characterization increases. Supplying any or all of the bulk properties, such as molecular weight, density or Watson (UOP) K factor will increase the accuracy of your pseudo component properties. Moreover, if you supply laboratory curves f... |
Problem Statement: Why my TBP curve in the oil manager and the one reported in the boiling point curve utility is not the same? | Solution: The TBP curve in the Boiling Points Curve utility is not the copy of the distillation curve you have provided in the oil environment. Basically it is converted result. The curve you provide and the curve you get are not supposed to match 100%. In order to match the data I have done the following (see attached... |
Problem Statement: What is the definition of Cv? | Solution: The Cv coefficient of a valve is defined as the flow of water at 60 F, in gallons per minute, at a pressure drop of 1 lb/in^2 across the valve.
Keywords: Cv
References: : Crane Handbook - Chapter 2 - Flow of fluids through valves and fittings |
Problem Statement: A user does not wish to display certain stream components in the Composition page of the Workbook. However, if these columns are deleted, the calculated compositions for all other components appear as <empty>. | Solution: If the user chooses to delete a stream column in the Compositions page of the Workbook, This will be deleted in the main flowsheet Thus, the flowsheet will be unable to solve completely. This is not a defect, but the way the Workbook is implemented.
User should select the option ‘Hide object’ instead. Th... |
Problem Statement: How does one specify different temperature and pressure conditions for the outlets from a component splitter? | Solution: A component splitter in Aspen HYSYS will split a material stream into two outlet streams with specified compositions. By default, this is an adiabatic process. You can specify two state variables for one of the outlets, and only one for the other. The enthalpy from the inlet equals the sum of the enthalpy of ... |
Problem Statement: How can I do the rating of the reboiler of a distillation column? | Solution: You cannot directly do the rating of your distillation column since if you didn't specify it differently, it is only a heat exchanger called reboiler in which you have this option but it won't be a good option because when you type the sizing information the distillation column will lost all the results. But ... |
Problem Statement: I have already specified (and not overspecified) the sizing and heat transfer information; however, my pipe segment says Not Solved. What should I check or do? | Solution: 1. If the status bar of the pipe segment unit operation says Not Solved and you get the error (either in a pop up window or in the trace window) Negative pressure calculated on increment....., probably the flow is choked. Go to Design|Calculations and toggle the Check Choked Flow check box. Now, if the status... |
Problem Statement: How do I change the default unit set in the Equipment Grid Summary when I activate Economic Evaluation in Aspen HYSYS? | Solution: You are able to change the available template options under Costing Options .
1. Click on Browse tab then select required template from available choices:
2. After selecting the required template, click on open.
3. Then, click on Activate Economic Evaluation > Load simulation > Map Unit Operations >
Size It >... |
Problem Statement: What is pressure gradient in the Slug Tool? How does it differs from the Pressure drop in the defined Pipe System? | Solution: The Pressure Gradient is the pressure drop over a slug/bubble unit, the pressure drop of a defined pipe system is calculated using the selected correlation.
The overall pressure drop calculated by HYSYS is the sum of Friction, Static Head, and Fitting Pressure drops.
Keywords: Pressure drop, Pressure gradient... |
Problem Statement: What's new in the Cold Properties utility in Aspen HYSYS 2006? | Solution: The Cold Properties utility display the cold properties of a stream, as summarized in the table below:
In version 2006, some new options have been added to the Cold Properties utility. On the Design tab, it is now possible to select the methods used to calculate some of the cold properties. To make this selec... |
Problem Statement: I have a column involving two sets of identical hypothetical components generated from the same assay using the Oil Manager. I find it extremely difficult to get the column converged. Why? What should I do in this situation? | Solution: It is unfortunately quite common for Aspen HYSYS to generate a singular matrix when solving equations (leading to difficulty converging columns) if there are two sets of identical components and all have on-zero compositions assigned to them based on the streams fed to the column. Suppose you try to separate ... |
Problem Statement: Why are the inserted parameters / variables not visible on the strip chart? | Solution: 1. Check the axes scale is setup properly for all curves. (Right click on the strip chart | Select Graph Control)
2. The temperature curves might be overlapping on the strip chart, Go to Graph Control | Curves and un-check the 'Show Curve' check box for undesired curves that are displaying, then the hidden ... |
Problem Statement: How do I know which assays have been installed in the Simulation Environment? | Solution: To see which assays have been installed you need to be in the Oil Environment. The Oil Environment is accessed via the Basis Environment by navigating to the Oil Manager tab and clicking the Enter Oil Environment button.
Once in the Oil Environment navigate to the Install Oils tab. This tab displays the strea... |
Problem Statement: This | Solution: contains some tips for arranging your Aspen HYSYS window.Solution
This is perhaps the most trivial information you've ever read on dynamic simulation, yet it is valuable information intended to make things a bit easier. The idea is to separate the trivial from the modelling problems, so you can better focus o... |
Problem Statement: What can I do if I get the Hysys.Economix Error - Economix Table Failed to Load: Table Case .\Basis\IcBasisStandardBasis.ptb 2 | Solution: The problem is that Economix is not able to find its key data files.
The picasso.ini config file setting(found in the same directory as HYSYS.exe) is set incorrectly:
Section: General
Key: DataRoot
This key in the config file must point to the root directory where the Economix scripts and tables are stored. O... |
Problem Statement: What are the steps I should follow to model a packed column? | Solution: There are already some existingSolutions (#109251, #109339, and #114510) available in our knowledge base that are related to packed column simulation. But if this is your first time modeling a packed column in Aspen HYSYS, you would appreciate the detailed instructions in thisSolution.
Once you have a conve... |
Problem Statement: What is the External Data Linker Unit operation? | Solution: This unit operation is used for case linking and collaboration.
It allows you to access streams which have been published to the RTI (Run-Time Integration) Server, and include their data in your simulation.
To add this operation:
select Flowsheet | Add Operation (or press F12)
select the Logicals radio button... |
Problem Statement: How are compressor and expander calculations in HYSYS performed? | Solution: Attached find a document describing the compressor and expander calculations in HYSYS.
Keywords: compressor calculations, expander calculations, equations, head, polytropic, centrifugal
References: None |
Problem Statement: I added a new stream to the model in the dynamics mode, and it appears to know all its specs although I didn't specify any thing, what is happening? | Solution: In dynamics every stream needs an initial estimate for the dynamic solver to start running. So as soon as you add a new stream Hysys give it default initial estimate (all components have equal composition, temperature = 25C and pressure = 1 atm). This can be used if this is an intermediate or a product stream... |
Problem Statement: How to check tray vapor as well as liquid transport properties in a column? | Solution: By default when you look at column transport properties results in tabular format, only liquid transport properties are displayed.
In order to get vapor as well as liquid transport properties, you must select radio tabs in the example below.
In attached file, double click on Depropanizer column then go to Per... |
Problem Statement: A stream or couple streams out from a column are not connected on the PFD. They are actually connected but not showing connected on the PFD. Is there a way to show them connected on the PFD? | Solution: Disconnect the stream from subflowsheet and reconnect. If it does not work, add a (any) unit operation after the stream and then delete the unnecessary unit operation.
Keywords: Disconnected stream, not connected stream, broken PFD, colum, stream, broken stream, hanging stream
References: None |
Problem Statement: How can I undo what I just did to my simulation? | Solution: The much anticipated Undo feature has finally become available in Aspen HYSYS 2006.
The Undo function can be accessed either through the Edit | Undo menu function or through the Ctrl-Z keystroke.
The feature enables the user to undo up to 10 actions in the property view. This includes specifying or changing... |
Problem Statement: How to set up tray sizing utility to display liquid from tray as net or total flow? | Solution: Tray sizing utility display net liquid from tray or total liquid from tray, depends on the settings on the 'Design page. If '% Liquid draw' is 0%, the result will be net flow. If you change it to100%, results will be total flow.
Keywords: Tray sizing utility, net liquid flow, total liquid flow
References: Non... |
Problem Statement: How to match the heating values with the calculated reactor duties? | Solution: There are two different heating values in practical use, the upper heating value and the lower heating value. The difference is the final phase for water. In calculating the upper heating value the water is considered to be in liquid phase. While for the lower heating value, the water is in vapor phase with a... |
Problem Statement: How is the Overall Heat Transfer Coefficient calculated in PIPESYS? | Solution: The .pdf file from Neotec entitled Estimation of the Overall Heat Transfer Coefficient for the Calculation of Pipeline Heat Loss/Gain should answer this question.
Keywords:
References: None |
Problem Statement: Pipe Segment: Why is my 3-phase flow indicating that my flow regime is Liquid Only? | Solution: Currently, HYSYS Pipe Segment is only able to deal with either two-phase fluid or single phase fluid (Vapour or liquid). The aqueous phase may be considered a solid when the temperature is too low.
Keywords:
References: None |
Problem Statement: The Tabular package has default values for the different coefficients. What is the reference for this data? | Solution: Aspen Hysys Tabular uses a default library and the tabular coefficients are retrieved from the database. These coefficients were regressed using data from DIPRR database (Thermophysical Property Database for Pure Chemical Compounds).
Keywords: Tabular, data, default, coefficient
References: None |
Problem Statement: How do I resolve the error Could not construct adapter for case when activating an Aspen Simulation Workbook case in Aspen HYSYS? | Solution: For Windows 7 or Vista:
1. Open windows command processor as administrator, cmd is located on C:\Windows\System32
2. Access the path where CxsInteropCOMV22.DLL file is located (C:\Program Files (x86)\Common Files\AspenTech Shared\)
3. Enter RegSvr32 CxsInteropCOMV22.DLL
3. A window will be displayed with the ... |
Problem Statement: How does HYSYS represent <empty> or null values internally? How can I check in code if a value is <empty>? | Solution: Unknown values are shown as <empty> in the HYSYS interface. Internally HYSYS uses the integer -32767 to represent these values.
As an example, if the following code is used to retrieve the temperature of a process stream for which a temperature has not been specified, a value of -32767 is returned.
Dim hy... |
Problem Statement: I get an error when I try to run the Design phase in Hysys.Economix, what is wrong? | Solution: If you get the following error:
Economix: Initializing Design and Costing Engine...
Economix: *** Error: Failed starting Icarus Server
Economix: Ensure that there are no IcServer.exe processes running Economix: *** Error: Initialization of Design and Costing Engine failed
in the Trace Window, there are a numb... |
Problem Statement: Is there a way to change the default temperature for each the fraction name on the list under Oil Characterization | Assay Data Type Chromatograph?
Is there a way of add more Fraction Name, for instance, if you have information for C31, C32,....? | Solution: The temperatures cannot be changed. They represent the boiling point of the components. Although for hydrocarbons the boiling point is usually provided as a range, in Aspen HYSYS this is fixed.
Regarding additional components, you cannot add anything more. It is also fixed.
Keywords: Crude, Oil Characterizati... |
Problem Statement: Error running integrated products such as Pipesim Link, Extensions, Refsys, APEA in Aspen Hysys on Windows 7 platform. | Solution: Need to run Hysys.exe as administrator.
User can create Hysys shortcut on desktop, then right click select Properties.
Go to Shortcut tab, click on Advanced button as shown screenshot below.
Select ?Run as administrator?.
Keywords: Pipesys link error, refsys error, extensions, APEA integration, Windows 7
Refe... |
Problem Statement: How can I get the utilities to work in Dynamics? | Solution: By default utilities are not enabled in Dynamics. Beginning in HYSYS version 2.2, a Dynamics tab has been added to any utilities capable of calculating in dynamics. To activate the utility in dynamics select Enabled in Dynamics. On the same tab, you may also select the frequency of re-calculation for the util... |
Problem Statement: Can I use mild steel as a value if my pipe is made of stainless steel? | Solution: The mild steel value has different properties than stainless steel and the thermal conductivity is much lower.
If you want to use Stainless Steel this needs to be used through the User defined material option.
When you add a Pipe segment, under Rating Tab append a segment. Here you can select the material of ... |
Problem Statement: Why isn't my PIPESYS unit operation solving? | Solution: If you have registered the extension properly, you should be able to double click on the unit operation and see all the information entered for that pipe segment. If the status bar indicates Insufficient Information in a Pipeline Unit check the Status window at the bottom left hand corner of the HYSYS program... |
Problem Statement: When I print the workbook in the attached simulation, it shows several additional components that are not part of the component list in my simulation. Is there a way to remove these components? | Solution: There was a similar issue that was fixed for v7.2. But if a component is deleted on an earlier version and then opened on v7.2 or v7.3, then the problem shows up again.
The only available workaround is to manually add the unwanted components to the simulation. And then remove them from the list. Then save t... |
Problem Statement: What is New in Aspen HYSYS V7.3 - New Hydrate Model for High Pressure | Solution: As oil companies have gone to deeper depths to find and produce oil, the pressure and temperature ranges of the thermodynamic models must be extended. In particular, the accuracy of commonly used hydrate formation prediction models decreases for pressures over 100 bar.
In V7.3, the HYSYS Hydrate Formation Uti... |
Problem Statement: Is there an AutoBackup? | Solution: Yes. You have the ability to choose whether or not Hysys will back up your cases periodically. Backup cases will be stored in the working directory, with the extension .bk*. Options you have include setting the frequency of the autosave functionality, specifying the number of backups which are saved, and whet... |
Problem Statement: How can I copy streams from one case to another case? | Solution: Ensure that all of the components used by the case you are copying from are in the Fluid Package used by the target case. If copying stream to a new case:
Export the Fluid Package from the Original Case
Create a New Case and Import the Fluid Package
Open the original case
Select the stream(s) you are interest... |
Problem Statement: Can I access the Stream Cutter object via Automation? | Solution: The stream cutter operation is not yet 'wrapped' for normal automation access. However it can be accessed via 'Backdoor' methods. Attached is some example code that shows how to get to the important properties.
Public Sub AccessStreamCutter()
'
'Description: Access all the important properties of the s... |
Problem Statement: New in HYSYS V7.3 - Start page with RSS feeds | Solution: Aspen HYSYS V7.3 makes it easier than ever to stay informed with news about upcoming webinars, training events, how-to knowledgebase articles, and short animated tutorials. The new Start Page features quick links to help topics, including a summary of new features of HYSYS V7.3 and previous versions. There ar... |
Problem Statement: Why can I not find the referenced spreadsheet for the FRI Tray Rating utility? | Solution: The FRI Tray Rating utility in Aspen HYSYS provides an interface to the FRI tray rating calculations. The spreadsheet itself, however, is licensed by a third party (Fractionation Research Inc.).
If desired, you can verify if your company is currently entitled to have the FRI spreadsheet via the FRI website (h... |
Problem Statement: How do I link cases/ use the case collaboration feature in HYSYS? | Solution: Consider the situation where you have two cases, for example:
Case 1: heat exchangers upstream of a column which deliver the column feed at appropriate conditions
Case 2: a simulation case containing the column. Now suppose you want to link the product stream of Case 1 (the source case) as a feed to the colum... |
Problem Statement: How do I use the Case Security features introduced beginning with HYSYS 3.0? | Solution: HYSYS 3.0 introduces a new level of Case Security to ensure the integrity of the intellectual property contained within a HYSYS model.
This feature was developed to give the Case author the required level of comfort when distributing HYSYS models that they have invested a lot of time and knowledge in. In addi... |
Problem Statement: How does changing the diameter of a pipe help getting out of slug flow regime?
Why does a smaller diameter pipe predict slug flow but not a larger diameter pipe for the same stream? | Solution: Either increasing or decreasing diameter of pipe can help getting out of a slug flow regime. It depends on what are the current conditions and which way you want to move. Consider current conditions are at point A in the Beggs and Brill flow regimes are shown in the figure below. It is currently in the interm... |
Problem Statement: Where can I see the description of each Extension available in V7.3 Object Palette? | Solution: The following extensions are available in Aspen HYSYS V7.3 Object Palette
1. Saturate Extension
Purpose: Calculates the amount of water needed to saturate a gas stream
For more description of this extension please view KBSolution 110073
2. Ejector Extension
Purpose: It computes the pressure increase o... |
Problem Statement: What are the definitions of Phase Fraction [Molar Basis], Phase Fraction [Mass Basis], Phase Fraction [Vol. Basis] on the stream Worksheet\Properties page? | Solution: These properties represent the fraction of the stream occupied by a particular phase, expressed in various ways:
Phase Fraction [Molar Basis] = Phase Mole Flow / Total Mole Flow
Phase Fraction [Mass Basis] = Phase Mass Flow / Total Mass Flow
Phase Fraction [Vol. Basis] = Phase Std Ideal Liq Vol Flow / Total S... |
Problem Statement: Hydrate Utility CSM model - estimation of Fugacity of Water in Hydrate. | Solution: The CSM model relies on the equilibrium equivalence of the fugacity of water in the hydrate phase to that of water in the fluid (Aqueous, liquid hydrocarbon or vapor) phase,
fw H = fw k
where:
fw H = fugacity of water in the hydrate phase
fw k = fugacity of water in the fluid (Aqueous, Liquid hydrocarbon or V... |
Problem Statement: How can I export data from my workbook (or any table in Hysys) to a spreadsheet program such as Excel? | Solution: This can be accomplished in two easy steps.
You can easily export a sheet from a workbook or any other Hysys printed tables by printing the specsheet in comma delimited format. For example, if you wish to export the contents of a workbook sheet, this can be done by right clicking on the workbook title bar, th... |
Problem Statement: How do I change unit of Std Ideal Liq Vol Flow? | Solution: To change units of Std Ideal Liq Vol Flow-
1. Go to Tools=>Preferences
2. Click on the variables tab
3. Find variable Liq.Vol. Flow in the list and change display units that are desired. It will change units for Std Ideal Liq Vol Flow.
Keywords:
References: None |
Problem Statement: How do I get my STX exchanger to solve in HYSYS? | Solution: If the link is established between the two programs (they are linked when you can press the View Design button on the Design Parameters page and STX comes up) but the exchanger does not solve in HYSYS, it might be best to save the process data in STX as an .sti file and run the model in STX stand-alone. This ... |
Problem Statement: What is the difference between Actual Volume Flow and Standard Gas Flow? | Solution: Actual volume flow takes the non-ideality of the system into account and this depends on the fluid property package used in the simulation. This is calculated at the stream conditions.
Std. gas flow assumes ideal gas behaviour and is calculated from standard ideal molar volume.
It is important to note that ac... |
Problem Statement: The Standard Gas Flow of a particular stream is different in both the Stream Worksheet and the Workbook. | Solution: The Standard Gas Flow value shown in the stream Worksheet tab, Properties page is calculated by the correlation that utilizes the conversion of 23.6444359 m3/kgmole at standard conditions of 15 C and 1atm. The molar flowrate of the stream is multiplied by this conversion to give the standard gas flow in STD_m... |
Problem Statement: How do I model a delivery point (outflow) inside the PIPESYS extension? | Solution: A Side Stream Pipeline Unit in PIPESYS can be used to add or remove flow from the elevation profile. For pipelines with multiple sources, this provision eliminates the need to create multiple streams and multiple pipeline units. This is especially useful if pressure losses in the side stream are either incons... |
Problem Statement: Head loss under downcomer is too large?Y?Y么?OZv?H ??么???r?H | Solution: ???I?OZv?Ydowncomer head loss 值`?`??B ?YTray Sizing Utility???CPerformance | Trayed | Trayed Results | Downcomer | DC Head Loss栏???A?E查??结?E值?B?e响Head Loss计ZZ值?IZ??v?oZq?YDowncomer Clearance?B ?v???????x???C调??Downcomer Clearance(?n统?z?E值?Y 1.500)?I值???z?x???M`??i???????B
Please find theSolution 124197 for ... |
Problem Statement: Will the Peng Robinson Property Package simulate Amine systems for sour natural gas plants? | Solution: No, the Peng Robinson PP will not simulate amine systems. When you attempted to find the amine components, you probably could not find them when selecting PR as your property package. Some amines are available with the PRSV property package, but we do not recommend using it to model sour gas treating. The onl... |
Problem Statement: How do I set the default version of Aspen HYSYS in Windows 7? | Solution: To change the default version of Aspen HYSYS in your machine, you can run the attached .bat file. The attached .bat file will set the default version to Ver. 7.3. This will also set the correct version of Hysys.tlb which you need to run any automation through VBA.
To change the default version to V7.2 or othe... |
Problem Statement: How can I regress Binary Interaction Parameters (BIP) for my EOS based in Solubility data using COMThermo Workbench? | Solution: Go to Start Menu -> All Programs -> AspenTech -> Process Modeling -> Aspen Hysys Thermodynamic COM Interface
Click in the Fluid Package Manager
Append a new fluid package by clicking in the Add Fluid Package Icon
Select the Fluid package that you required as you would do to install a COMThermo package and sel... |
Problem Statement: How can I see what is in the Column SubFlowsheet from the Main Environment PFD? | Solution: You can view the Column PFD from the Main Flowsheet PFD. Object Inspect the Column which you are interested in, and from the menu select the Open PFD option This PFD displays all internal streams for the Column, as well as the number of stages in the Column. Note: when this view is opened from the Main level,... |
Problem Statement: What is the Vapour Load in the Flooding section of the Tray Sizing utility? | Solution: On the Tray Sizing utility, Performance Tab, Trayed Page, click on the Flooding radio button, the column that says vapour load represents the following:
vap load = (vaprate) * sqrt( vapden / (liqden - vapden) )
Where the vaprate is the vapour rate shown on the Tables page of the Tray sizing utility, and liqde... |
Problem Statement: Can I change the flow rate of the assays in a blend via OLE? | Solution: Yes, the attached VBA code illustrates this. Paste the attached code into the Excel VBA editor (or similar) and make the HYSYS type library reference.
Public Sub EditBlendFlowRates()
'
'Description: Demonstration of how to edit a flow rate for the Assays making up a Blend
' Assumes the R-1.h... |
Problem Statement: In HYSYS versions like 2006.5, V7.0 and V7.1, users can find the XML data view/report by going to Simulation | View XML from the main menu on top of the HYSYS diagram, as described in | Solution: 122745.
However, there is no such Simulation | View XML option in HYSYS V7.2 or V7.3. ThisSolution describes Where to generate and view the XML data input summary in HYSYS V7.2 and V7.3.
Solution
In HYSYS versions newer than V7.1 (exclusive of V7.1), i.e. V7.2 and V7.3, the previous option Simulation | View X... |
Problem Statement: How can I calculate a rate of change for a variable in Dynamics? | Solution: The way to achieve this is to use the Transfer function logical operation to set a delay time for the variable of interest. The output from the Transfer function and the current value of the variable can then be read into a spreadsheet operation and then the rate of change can be calculated using a simple num... |
Problem Statement: Why can?t I rate a valve in HYSYS? Is this option included in Steady State? | Solution: On earlier releases, HYSYS did not include the option to rate the valves in steady state (i.e. define C1, Cv or K and opening percentage and calculate pressure drop), but starting with V7.3 this option is included.
The following scenarios are supported:
a. Mass Flow and P2 (downstream) are known, P1 could... |
Problem Statement: How does one view process utility consumption in Aspen HYSYS? | Solution: The Aspen HYSYS Process Utility Manager lets you define and apply utility tags to material and energy streams, to designate them for calculation of energy and utility consumption and costs.
User can view overall Utility consumption data per utility tag, or User can view data for each utility at the stream lev... |
Problem Statement: Validation of water content in natural gas calculations by Peng-Robinson property method in Aspen HYSYS . | Solution: Predictions of water content in natural gas by Peng-Robinson property method are very good. Results are validated against GPSA and experimental data.
Results are compared against
1. Experimental data from Olds, Sage and Lacey, Phase Equilibria in Hydrocarbon Systems. Composition of Dew-Point Gas in Metha... |
Problem Statement: How does one use the Electrolyte NRTL model in Aspen HYSYS? | Solution: 1). From Simulation Basis Manager Components/Databank select Aspen Properties then add only molecular species.
2). Create a Fluid Package then select Aspen Properties then select Property Package as Electrolyte NRTL.
3) Click on the Electrolyte Wizard button.
4). In the ensuing window, include the water di... |
Problem Statement: How does Aspen HYSYS deal with heat of mixing? | Solution: If an equation of state (EOS) model is used, the heat of mixing is inherent in the enthalpy calculation based on thermodynamic relationships.
However, it will not be accounted for if an activity model is used.
You should consider adding your own data through the Tabular package when significant heat of mixing... |
Problem Statement: I can't find User Variables that I know are there. What should I check? | Solution: I know my case contains user variables, because I can see them by going to Simulation ... Import and Export User Variables, however when I go to the User Variables page of my stream / operation they are not on the list - where have they gone?
In order to see / enable the user variables you will have to first ... |
Problem Statement: Aspen HYSYS Stream Reoport (HSR), Workbook Dump, Aspen HYSYS Browser and Excel (with Macros) do not work. How to fix it? | Solution: Reason 1: The number 1 reason for not working any Excel file with Macros / Visual Basic code is high macro security.
Reason 2: Multiple versions of HYSYS. Excel gets confused which version of HYSYS to use.
Reason 3: Type library referenced to wrong version of HYSYS.
To solve the problem try the following st... |
Problem Statement: How can I model a check (non-return) valve in dynamics ? | Solution: A check valve can be modelling by adding a regular valve to your flowsheet and selecting the Check Valve box on the Dynamics -> Specs page of the valve property view.
Keywords: Valve, Check Valve, Non-Return
References: None |
Problem Statement: What is the difference between Net and Total Flows in the Column? | Solution: Net Flows are the flows within the column.
Total Flows also include the draw(s) from the stage.
In the Column Environment, Net Flows are displayed on the Tray Section Performance tab (Main TS Property View, Performance tab, Flows ply).
In the Main Environment, Net Flows are displayed in the Column Runner (Col... |
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