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Problem Statement: Can I model valve hysteresis when using a Relief Valve in the Dynamic Depressuring Utility? | Solution: The Dynamic Depressuring Utility can model depressuring through a relief valve by selecting Relief for the Vapour Flow Equation on the Design\Valve Parameters page of the Dynamic Depressuring Utility.
When a Relief valve is selected the user is able to specify the Relief valve Set Pressure and Full Open Press... |
Problem Statement: You have been asked by business users to find a list of users logged into Collaborative forecasting tool. Upon analysis there were two tables found (CF_LOGIN_AUDIT & CF_LOGIN_SESSION) which captures the login details of users. CF_LOGIN_AUDIT does not captures admin login where as CF_LOGIN_Session ca... | Solution: CF_LOGIN_AUDIT tables captures the windows authenticated users log off information (we use this table for internal business processing). The CF_LOGIN_SESSION table captures login details of user(s). The admin user information is not captured in any of the above mentioned tables.
Keywords: None
References: Non... |
Problem Statement: Automation example - Access to LNG Exchanger results data | Solution: The attached Excel spreadsheet illustrates how to obtain LNG results data via OLE Automation (including the UA values for each side using a Backdoor method).
For example code illustrating access to LNG Exchanger curve data (including Hot Composite Curve) see KnowledgebaseSolution #112509.
Saved with a HYSYS 3... |
Problem Statement: Every time I load in a case in HYSYS 3.1 or higher, I get a message box asking Would you like to see a standard property set for all streams in addition to those properties already being displayed?. What does this mean, and how can I get rid of this message so that I don't have to answer the same que... | Solution: The message that you are seeing when you open a case in HYSYS 3.1 or higher is asking if you would like HYSYS to display all of the stream properties included in the Standard property set, or if you would rather keep any property sets that you may have created yourself.
Choosing 'Yes' will overwrite any exist... |
Problem Statement: What is the best approach to build and converge a complex column? | Solution: Generally speaking, it is very difficult to set up a whole complex column and converge it to specifications. There are two approaches with which Hyprotech Technical Support has had success.
METHOD 1 - BUILD A SIMPLE COLUMN AND INCREMENTALLY ADD SIDE OPERATIONS
The first approach is to take a step-by-step app... |
Problem Statement: How do I obtain the coefficient of thermal expansion? / Example User Variable | Solution: The derivative properties, such as the coefficient of thermal expansion, and Joule-Thomson coefficient are not readily available in HYSYS. However, it is relatively easy to calculate their values. The attached HYSYS 3.0.1 case illustrates how to calculate the coefficient of thermal expansion.
The coefficient ... |
Problem Statement: How can I find a volumetric heating value using Aspen HYSYS? | Solution: The lower and higher heating values reported in Aspen HYSYS are on a mass or mole basis, these can obviously be converted to a volume basis by multiplying by the appropriate density. However, the gas lower and higher heating value property correlations in Aspen HYSYS are already reported on a volume basis. Th... |
Problem Statement: Is there any reason to justify Beggs and Brill as the default correlation for the pressure drop estimation of a pipe segment? | Solution: The Beggs and Brill correlation is able to predict the liquid holdup and pressure drop that occur during two-phase flow in pipes at all angles and at several flow conditions. For more information please refer to the classical paper by Beggs and Brill: Journal of Petroleum Technology, May 1973, P607-617.
Keywo... |
Problem Statement: What is the discharge coefficient for an orifice/venturi/valve and how is it defined? | Solution: Please see the attached Word document.
Keywords: discharge coefficient, orifice, valve, venturi
References: None |
Problem Statement: When I click on the Manage Overrides tab in Collaborative Forecasting I just get a blank screen. | Solution: Check to see if you have logged in as an Administrator. The Admin role does not have privileges to manage overrides.
Keywords: CF
References: None |
Problem Statement: I am unable to move icons in the PFD, whenever I move the cursor over an icon small squares appear on the icon. | Solution: You are in Attach mode in the PFD. Select the button in the upper left hand corner of the PFD (i.e., the Move/Attach button) to leave that mode
Keywords:
References: None |
Problem Statement: Dynamic Simulation Across Project and Facility Lifecycles | Solution: Process simulation models are essential components of the basic toolkit of process design teams. Traditionally, these simulations are static models, and sometimes, substantial engineering design margins are required to compensate for their limited abilities. Specialised dynamic modeling was developed to inves... |
Problem Statement: I get Run-Time Error 1607 during the installation of my application. What do I do? | Solution: This issue occurs on some systems depending on the system configuration and privileges set for the user. Listed below are some common causes of this error message:
The user does not have administrative privileges on the machine. This pertains to Windows NT, 2000, or XP machines.
The ALLUSERS property is not ... |
Problem Statement: While running a user variable, how do I bring up a dialog box to collect input data the first time and only the first time a unit is created.
How do I conditionally bring up a user dialog in user code? | Solution: In order to bring up an input box while code is running, you need to provide some code in the user variable code that creates a user input window. Here are some steps that needs to be followed.
1. Bring up the property interface for the unit-operation or object where you want to attach the user variable... |
Problem Statement: How to hide all stream labels on the PFD? - Automation example | Solution: The VBA code in the attached Excel spreadsheet allows the user to select a flowsheet within the currently open HYSYS case and attempts to hide all of the stream labels in the currently active PFD for that flowsheet.
Each of the PFDItem type objects that make up the PFD (i.e. stream and operation icons and the... |
Problem Statement: How can I set Separator Dimensions via OLE Automation? | Solution: Since the separator dimensions properties are not available within the HYSYS type library (they are not yet 'wrapped' for standard Automation access), it is necessary to use a 'Backdoor' method. This uses the internal variable name (or 'Moniker') to directly access the values. The code below illustrates how t... |
Problem Statement: How do I add a Property Correlation to my Stream Table or Workbook? | Solution: Any of the possible Property Correlations (i.e. those on the Worksheet ... Properties page of the stream - e.g. Water Dew Point, Wobbe Index (both HYSYS 3.1+), RVP (3.2+), Refinery properties (REFSYS)) can be displayed on a Stream Table or on the Workbook by using the following procedures:
Stream Table
Double... |
Problem Statement: Does Collaborative Forecasting support derived attributes dependent from multiple base attributes, as well as in Aspen Collaborative Demand Manager? | Solution: Any attributes in Aspen Collaborative Demand Manager that are derived from the base attributes in ELEMENT can be used in Aspen Collaborative Forecasting. For example if we have in Aspen Collaborative Demand Manager a derived attribute dependent on LOC and PRO can be managed in Aspen Collaborative Forecasting.... |
Problem Statement: The streams coming out of my column are not arranged properly on the PFD (i.e. the bottoms stream looks like it is coming from the middle of the column). How can I change their placement? | Solution: Changing the column configuration after the streams are connected to the column will sometimes cause the streams to become misplaced.
To force the streams to their proper positions, changing the column icon sometimes helps. To do this, right click on the column and choose Change Icon. Change to any other icon... |
Problem Statement: How do you clear out an Aspen Collaborative Forecasting (CF) database and rebuild from scratch? | Solution: Note: This is a 'last resort' option as it wipes out all current user Ids and security subroles. Users will also have to recreate any custom reports they had previously
* Recreate CF database schema for :
- Open a CMD window and navigate to the cf_integ folder for the envelope/environment that you want to rec... |
Problem Statement: What is the Reset Perts flag? | Solution: Use of the Reset Perts flag will reset the perturbations before proceeding with the perturbation of the subsequent variable. Use of this flag may help to reduce the noise in the Jacobian matrix.
Keywords: Reset perts, perturbations, optimizer
References: None |
Problem Statement: What can I do to speed up convergence of my optimization problem? | Solution: Fine tuning an optimization case for optimal performance will require a thorough understanding of cause and effect of the process variables in your model, and an understanding of how the optimizer and its tuning parameters work. There is no answer to this question that will perfectly address all cases, howeve... |
Problem Statement: When user login to Collaborative Forecasting application, they get the error message insufficient client license, contact CF administrator. | Solution: When user exits Collaborative Forecasting application, please always use application logoff/logout link.
The CF application license works in a following way:
1. When you need to exit CF web client, DON?T just kill the browser, instead, click on Logoff. Then the client license seat is released.
2. ... |
Problem Statement: Extension unit operations are present in my model, but they don't appear on the PFD. How can I get them back? | Solution: Extension operations (eg Saturate and Gas Properties) sometimes vanish from the PFD. This seems to occurs when the file is opened on a PC without the extension installed, then saved. Once the file gets saved on this PC, the extension vanishes from the PFD.
They are still present in the model and work as expec... |
Problem Statement: In a Japanese system, when trying to enter overrides, after clicking the Submit button, the following error appears: Failure of submitting the quantity override. Please consult the controller. | Solution: This error is due to the fact that the Internet Explorer language setting for the Collaborative Forecasting user is different from English. It must be reset to English. To do this, open Internet Explorer, go to the menu Tools | Internet Options, select the General tab, click the Languages button under Appeara... |
Problem Statement: How does the MASSBAL solver compare to the normal HYSYS Solver? | Solution: HYSYS solves using a sequential modular solver. Unit operations must have specific degrees of freedom satisfied (specified) in order for the unit operation to solve.
MASSBAL uses a simultaneous solver. In MASSBAL, a completely specified problem requires that there be no degrees of freedom remaining for the fl... |
Problem Statement: Why does the forecast only show through June 2013 in Aspen Collaborative Forecasting? | Solution: This is caused when the weblogic server is hanging on a thread and not accepting any more new requests at that juncture. To resolve the problem, restart the weblogic service.
Keywords: None
References: None |
Problem Statement: Calculation of Integral and Differential Condensation Curves in HYSYS | Solution: [Based on HTFS Handbook Datasheet CP13 Vapour Liquid Equilibrium in Condensers]
Integral Condensation
To calculate an integral condensation curve the bulk vapour phase at any point is considered to be in equilibrium with all of the previously formed bulk condensate.
To calculate such a curve in HYSYS there ar... |
Problem Statement: Can I use Automation to flash a Fluid object to a different pressure with a specified polytropic Efficiency? | Solution: Unfortunately using OLE Automation to flash a Fluid with a given polytropic efficiency is not straightforward. It is best done by guessing an outlet temperature, calculating the polytropic efficiency and then iterating on the temperature until the required efficiency is achieved. The code below illustrates th... |
Problem Statement: How can I saturate a gas stream with water in HYSYS? | Solution: There are two methods to saturate a gas stream with water in HYSYS. The first method is to do it manually: Create a water stream and use a Mixer Unit Operation to mix the water and gas streams. The product from the Mixer goes into a 3-phase Separator. You can then use the Adjust Logical Operation to adjust th... |
Problem Statement: Common OLE error codes which occasionally pop up in HYSYS | Solution: Here are a few of the common OLE error codes that pop up occasionally in HYSYS:
Hex Decimal
Code
Meaning
0x00000000 0
S_OK
All''s well. This is returned if the OLE call is successful.
0x80004005 -2147467259 E_FAIL Generic error. Returned if you try to access an item past the end of a collection, if you ask fo... |
Problem Statement: You are going to deploy the CF permanent fix to your production environment.Before applying you would like to have some rollback instructions in the eventualities of no options left other than rollback the CF patch. | Solution: Before applying patches you should back up of CF.ear and CF.JAR files. Once the Patch is applied it will overwrite existing resources with new ones. You should also make a backup copy of both the CF_integ folder and your CF database to ensure nothing bad happens.
Keywords: None
References: None |
Problem Statement: Are there any tips and tricks for converging refinery crude columns? | Solution: Below are a few tips for converging refinery crude columns:
Observe the oil distribution chart in the Oil Manager. If the oil characterization for the stream was not done within the HYSYS case, you can re-engineer the TBP curve based on the Boiling Point Curves utility so that you can then view the oil distri... |
Problem Statement: The vapour fraction reported on the stream conditions sheet is different from that reported on the stream properties sheet. What is the difference between the phase fractions reported on these screens? | Solution: Phase fractions reported on the stream conditions form are mole based while that displayed by default on the stream properties form are Std Vol based.
Keywords: vapor, standard volume
References: None |
Problem Statement: What process is used to inform the SLM Server that a license token can be released? Will the SLM Server periodically check if a session is still valid? Or is there another process in place? | Solution: There is one underlying library in the CF web application end which sends notifications and receive acknowledgements to and from the SLM server if that particular client license token is released.
Keywords: None
References: None |
Problem Statement: You would like to install Weblogic 10 with Collaborative Forecasting (CF) version 2006.5. Is this version included with the CF install? | Solution: Yes. The CF installation does include Weblogic 10 as well as the BEA licensing required to run the Weblogic server.
Keywords: Weblogic
CF
2006.5
10
References: None |
Problem Statement: Can I add Triolein to my component list in Aspen HYSYS? | Solution: In Aspen HYSYS 2006.5 and higher versions, Triolein is included in the Aspen HYSYS component library to facilitate the modeling of the bio-diesel processes. Triolein, (C17H33COO)3C3H5, is a triglyceride that is frequently used to represent the reactant oil.
Keywords: triolein, bio, diesel, biodiesel, triglyce... |
Problem Statement: In V7.1, you encountered this error when attempting to upload override file.
Error Message: The system was not able to create an override from the uploaded file. Please check that the file is valid and try again. | Solution: There may be multiple reasons as to why the file doesn't upload. ThisSolution attempts to provide some guide to resolving common issues. At the end of each suggestedSolution, do try if it works by attempting to (a) invoke the webservice at the IIS host; and (b) file upload through the CF website from the clie... |
Problem Statement: I can't see any information in my extensions after importing the data from an XML case I created. | Solution: You can not use the XML feature with extensions or user unit operations in HYSYS. This is because the code needed for using XML is not included within the extensions/user unit operations, therefore HYSYS does not know how to read this information.
Keywords: XML; Extensions; User Unit Operations
References: No... |
Problem Statement: Why do we need JAVASYSPRIV permission for CFUSER when we configure the Aspen Collaborative Forecasting database in the Oracle environment? | Solution: We need to configure JAVASYSPRIV permission for CFUSER only if we setup server side triggers
You don't need this security permission setup if you are using client side triggers.
Keywords: JAVASYSPRIV
CFUSER
Server side triggers
References: None |
Problem Statement: Visualizing Mass Higher Heating Value in stream properties in Aspen HYSYS | Solution: Higher Heating Value can be added to stream properties by performing following steps.
1. Double click on the stream and go to Worksheet | Properties
2. Then click 'append new correlation' button (green plus button)
3. From the available stream correlations, expand the Gas correlations.
4. Under Gas correlatio... |
Problem Statement: Where are the sample files located? Can I get brief description about the sample files? | Solution: When installed, the samples should be located at: C:\Program Files \ AspenTech \ Aspen HYSYS (version such as 2006) \ Samples.
Note that the sample files for HYSYS version 3.2 and Aspen HYSYS 2006 have been attached to thisSolution. A brief description of each case is provided below:
ammonia.hsc
Ammonia S... |
Problem Statement: How can I use Automation to programmatically set Equation of State Options (e.g. Enthalpy Method, HYSYS vs. standard PR, or Liquid Density options) and Fluid Package options (e.g. Stability Test Method)? | Solution: The code below illustrates how to use VBA to set the following options on a Peng Robinson fluid package:
Enthalpy Method
Peng Robinson Options (HYSYS vs. Standard)
Use EOS Density checkbox
Smooth Liquid Density checkbox
Stability Test method (can be used on any kind of non COM Thermo fluid package)
The HYSYS ... |
Problem Statement: Is it possible to generate an input summary using Aspen HYSYS? | Solution: New in Aspen HYSYS 2006.5, an Input Summary was added to the HYSYS Flowsheet Summary form (i.e. select Flowsheet | Flowsheet Summary | Input Summary from the HYSYS main menu). Alternatively, the Input Summary can be generated by selecting Simulation | View XML from the main menu, and then activating the Input... |
Problem Statement: After changing the password for the IIS service account user, Upload of overrides are failing in Aspen Collaborative Forecasting (CF). How is this corrected? | Solution: You should review the IIS log files first. Most likely you will see multiple 401 error messages in the logs, IIS log file clearly indicates that domain\\user name, password combination in proxy.properties file not valid (Error 401 means unauthorized login failed). You then need to perform the following acti... |
Problem Statement: Is the Tacite pressure drop correlation still available in Aspen HYSYS? I can no longer find in among the list of pressure drop correlations in the pipe segment. | Solution: As of Aspen HYSYS 2006, the Tacite Hydrodynamic Module is no longer available in the pipe segment operation. When loading older cases that contain this correlation, the following error message may appear:
After acknowledging the above warning, the simulation case will load without further incident, but wi... |
Problem Statement: Server Error when the Create Override functionality is filtered by Legal entity and Business unit in the Collaborative Forecasting | Solution: Reason for the error, Collaborative Forecasting offline loading may take a long time if the file is large or data volume is high. The default transaction timeout in Weblogic server is 30 seconds and it is recommended to change this to 90 seconds or more.
To do this please follow the below Procedure
1. L... |
Problem Statement: Data Chart failing to display when user clicks Display Chart(s) icon. | Solution: Make sure you select the check box in the Chart column before you select the Display Chart(s) icon.
Failure to select the check box will result in an error.
Keywords: Collaborative Forecasting
Chart
References: None |
Problem Statement: This knowledge base article describes the steps to install bridge libraries into SCM. | Solution: 1. Open the case into which you will install the Bridge Libraries.
2. From the Navigation Pane, click Modeling | Tools | Library Manager.
3. In the SCM Ribbon, do one of the following:
Under the Home tab, click Properties or
Under Data tab, click Properties.
The Properties Panel opens.
... |
Problem Statement: This knowledge base article gives an overview of Macros in SCM. | Solution: What is a Macro?
A macro in SCM is a user defined procedure that contains a set of instructions to perform a particular task. It comprises of a series of commands. Any SCM command can be executed from a macro, however there are certain SCM commands that can be used only in macros.
How to write a Macro:
1. ... |
Problem Statement: When making a copy of process stream, how does using a Balance operation differ from using the Define from Other Stream button (found near the bottom of the stream property view)? | Solution: Both Balance operation and the Define from Other Stream feature can be used to create a copy of a stream. The primary difference between the methods is that the Balance unit operation provides a continuous link, whereas the Define from Other Stream feature transfers stream information only once. Thus if origi... |
Problem Statement: What are the differences between the SRK and PR equations of state in HYSYS? | Solution: The SRK equation of state in HYSYS has not been modified in any way and therefore remains much like the original text book model.
On the other hand, the original PR correlation has been extensively enhanced for HYSYS based on literature and experimental data.
You can find more information on the specific diff... |
Problem Statement: What are the correlations used to calculate flooding in the Tray Sizing Utility? | Solution: For Packed columns, the flooding equations used are either Robbins or SLE, and come from the following references:
Improve Pressure Drop Prediction with a New Correlation, Lanny A. Robbins, Chem. Eng. Progress, May 1991, pp. 87-91.
SLE, as summarized in Equilibrium Staged Separations, Philip C. Wankat, Elsevi... |
Problem Statement: If you have two Aspen Collaborative Demand Manager models is it possible to use one instance of Aspen Collaborative Forecasting for the two? | Solution: We do support multiple Aspen Collaborative Demand Manager models sharing a single Aspen Collaborative Forecasting instance, which is called Multi-Business unit support (see section 11 configuring Multiple Business Units in the Aspen Collaborative Forecasting Implementation Guide). Please also note that you mu... |
Problem Statement: There are a number of heat transfer fluids and refrigerants available in the Aspen HYSYS pure compound database, such as THEOL-59, and Refrig-22. Please refer to | Solution: #108968 for the whole list of these compounds.
When comparing the Aspen HYSYS predicted property values for these compounds with vendor data, for properties such as liquid density, viscosity, thermal conductivity and heat capacity, users often notice some discrepancies. This should not be a surprise, since ... |
Problem Statement: Is Aspen Collaborative Forecasting v2006.6 supported on Internet Explorer 7.0/8.0? | Solution: QE not tested Collaborative Forecasting v2006.6 with Internet Explorer 7.0/8.0, AspenTech cannot ensure the quality for the products that we didn't tested thoroughly.
We have tested Collaborative Forecasting v2006.6 with Internet Explorer 6.0; AspenTech recommends using Microsoft Internet Explorer 6.0
Keyword... |
Problem Statement: Common Errors that can occur when linking Excel to Aspen HYSYS via OLE Automation / VBA, and how to resolve them. | Solution: Type Mismatch, Method or Data Member not found, Compile Error ... Object Library Feature not supported or RPC errors
When linking Excel to Aspen HYSYS, the HYSYS type library must be correctly referenced to allow VBA to access Aspen HYSYS. These errors are often caused when the type library reference is to th... |
Problem Statement: Do I have to add a comment on every override in Aspen Collaborative Forecasting? | Solution: Ovd_comment_mandat=true in the property.ini file is set by default. Thus, you must ALWAYS add a comment for any override. You can change this to false, but this goes against best practice and is not advised.
Keywords: None
References: None |
Problem Statement: How do I model solids in dynamics? | Solution: Solids cannot be directly modelled dynamically in HYSYS. The work-around is to create (a hypothetical) or use a component with a high boiling point as the solid. Attached is a HYSYS 2.2 simulation case and an MS Word document that outlines how this can be achieved for a dynamic solid-drying process.
Keywords:... |
Problem Statement: What additional roles (ex: ASP .NET), need to be added to IIS in order for CFasp and MS2JService to work?
This knowledge base article describes which role services must be installed on IIS prior to installing Aspen Collaborative Forecasting (CF).
Here is the complete list of role services available ... | Solution: Please make sure these two are added when installing this role:
.NET Extensibility
A
Check IIS 6 Management Compatibility
A
Please also be sure you have installed already .NET 3.5.1
Keywords: Aspen CF, IIS, .NET
References: None |
Problem Statement: What are the conditions for Normal Boiling Point (NBP) and Ideal Liquid Density for Aspen HYSYS library components and Hypos? | Solution: For Aspen HYSYS library components and Hypos:
NBP is the Boiling point at 1 atm.
The conditions for the Ideal Liquid Density are somewhat more complicated. (This information comes from Section A.6.2 Page A-67 to A-69 of the HYSYS 2004.1 Simulation Basis manual. This refers to the database of library component... |
Problem Statement: By default, every 15 minutes, HYSYS will automatically save the simulation file in use. Sometimes, you would like to recover this file and wonder where it is located. | Solution: The location of the autosave HYSYS file is displayed in the trace window at the bottom of your HYSYS desktop, as shown in the attached image file. For example, on this specific computer where its user's name is lwang, this file can be located at C:\Documents and Settings\lwang\Local Settings\Temp.. It has an ... |
Problem Statement: Pipelines often do not remain at the same buried depth, so how does the Aspen HYSYS pipe segment calculate the heat transfer? | Solution: The buried depth that you enter in the heat transfer section of the pipe segment is the depth of the pipe, assuming that the pipe is parallel to the ground. That is, even if your pipe changes depth relative to the surface of the ground, the heat transfer calculation will always use the same value as the burie... |
Problem Statement: What is the difference between how dependent property curves and independent property curves are treated in the HYSYS Oil Manager? | Solution: In the HYSYS Oil Manager, it is possible to define physical property curves (density, MW and viscosity) as dependent or independent, in reference to distillation data. For a dependent property curve, a common set of assay fractions is used for both the distillation and physical property curves. For an indepen... |
Problem Statement: How can I access an un-wrapped variable without using a Backdoor object? | Solution: Many 'un-wrapped' variables - those that can only be accessed directly in code by using a Backdoor variable approach (see the cross-referencedSolutions above) - can be accessed indirectly via Automation by importing the variable into a spreadsheet cell and then using Automation to read or modify the value of ... |
Problem Statement: Real Separator User Guide: How to model carry over in separators? | Solution: Please see the attached pdf document.
Keywords: Real Separator, Carryover modeling
References: None |
Problem Statement: Why is HYSYS predicting a temperature increase across a valve? | Solution: When a fluid has a negative Joule-Thomson (J-T) coefficient, all equation of state (EOS) models will predict a temperature rise corresponding to a given pressure drop. An article on this subject has been attached to thisSolution (Working with Fluids that Warm Upon Expansion by J. Carroll, Chemical Engineering... |
Problem Statement: What version of OLGAS is being used in HYSYS? | Solution: OLGAS 2000 is incorporated into HYSYS v3.1 and up. HYSYS versions previous to 3.1 used the OLGAS v1.1 correlation.
Keywords: OLGAS, HYSYS, Pipe, Correlations
References: None |
Problem Statement: Why can I not enter my D86 assay in mass percent? | Solution: Aspen HYSYS accepts TBP and Chromatographic analyses in any one of the three standard bases; however, due to the form of the API Data Book conversion curves, EFV, ASTM D86 and ASTM D1160 distillations must be supplied on a liquid volume basis and ASTM D2887 distillations must be entered on a mass basis.
Keywo... |
Problem Statement: When do the Data Sets in the Update Log on the home page of Collaborative Forecasting update and what triggers their update? | Solution: The All Sets Published columns update when the create_schema.cmd is executed or when the database (Converting CF database from prior version to current version) is upgraded.
The Data Sets Re-Published columns updates after:
1. Published is selected from the Publish Collab Forecast screen.
2. Re-publish is s... |
Problem Statement: Prior to HYSYS v3.1, the variables shown in the variable navigator (e.g. when importing/exporting in the Spreadsheet, when selecting a Target Variable for the Adjust etc.) was not in any particular order. Consequently, the list of components displayed for a component variable (e.g. Comp Mass Frac) wa... | Solution: In HYSYS v3.1, a defect was fixed so that the variables shown in the variable navigator are alphabetised. Consequently, this also means that all the lists are alphabetised, including the component list.
Keywords: Components, List, Alphabetised, Order, Sort, Variable, Navigator, Variable Specifics.
References:... |
Problem Statement: Why when using the ENRTL-RK property method, DHVL calculated for water does not change when the corresponding submodel is modified (THRSWT/4 ) | Solution: This is actually an expected behavior that is determined by an option code of one of the models used in ENRTL-RK, in this case the model to compute DHL (DHLELC). ENRTL-RK is implemented so that for a non-water solvent, DHVL is calculated using the DIPPR submodel by default. The user can switch to another equa... |
Problem Statement: Why does a controller go to unstable when setting its parameters from a spreadsheet?
This problem appears usually when trying to configure an adaptive controller, i.e. a controller in which tuning parameters are a function of current conditions. | Solution: Note: This problem is fixed in V2006.5 and V7.1. Refer to theSolution id: 127899 and 128112.
The source of the problem is the fact that the export takes place all the time during the simulation even if the new value exported is the same. In other words, the simple fact of exporting a new parameter to the cont... |
Problem Statement: How can I take a side draw from a tray and set out to a stage below? For a better understanding of the procedure, this | Solution: document presents an example on how to take all the liquid from tray 6 and set out to the tray 7 in an Atmospheric Crude Tower.Solution Add a new specification into the Column. You must select the Column Liquid Flow spec. In the Stage option you will select the tray you want to take the side draw. As Spec Val... |
Problem Statement: -----------------
I'd like to be able to change the (dynamic) vessel heat loss model based on a spreadsheet cell value. | Solution: --------
Refer to attached model, and inspect the user variable code associated with the vessel. Code changes the heat loss model depending on the value in spreadsheet cell B1.
Note: These examples are provided for academic purposes only and as such are not subject to the quality and support procedures of o... |
Problem Statement: How is the flow rate calculated from the pressure drop in a valve in Dynamics? | Solution: The attached document describes the equations that are used to relate the flow rate through a valve in Aspen HYSYS Dynamics to the pressure drop. This document describes the general equations, the valve and pipe k value calculations and gives details of the pipe friction factor methods Assume Complete Turbule... |
Problem Statement: What does the Inlet droplet d95 distribution parameter, in the Horizontal Vessel Carry Over Correlation method, represent? | Solution: The Inlet drop distribution parameter represents the size of the inlet liquid droplets. This value is then used to determine the size of the droplets of water in oil and the size of the droplets of oil in water using the following method.
First the amount of water that is in the stream is determined from;
Wat... |
Problem Statement: Collaborative Forecasting patch- is there any back-out process or logic if the patch fails after installing? | Solution: There is no rollback script. The following files are replaced with existing files for CF 7.1 CP9 patch.
C:\CFBea\user_projects\domains\AspenCF\applications\cf.ear 11/9/2010
C:\CF\cf_integ\lib\cf.jar 11/9/2010
C:\Inetpub\wwwroot\AspenTech\CFasp\Bin\CFAspxLib.dll 3/19/2010
C:\Inetpub\wwwroot\AspenTech\ms2... |
Problem Statement: Why is there an inconsistent pressure trend when using Beggs & Brill correlation in PIPESYS? | Solution: For saturated gas at different temperature and pressure conditions, user may gets inconsistent pressure drop trend if the Beggs & Brill correlation is used for pressure loss calculation in PIPESYS.
In this condition, Neotech's recommendation is to use OLGAS or the default method (Oliemans) for pressure drop c... |
Problem Statement: What is the difference between the To AWD and From AWD buttons found on the Auto Water Draw window (opened via the column view)? | Solution: The Auto Water Draws (AWD) option allows for the automatic addition and removal of total aqueous phase draws from each stage depending on the conditions in the converged column. When the AWD configuration is turned on, the To AWD and From AWD buttons are used to manipulate this feature, as described below:
... |
Problem Statement: Why are there two phases shown in the stream's property view when the stream is at its Bubble Point/Dew Point? | Solution: When the stream is at its Bubble Point/Dew Point the second phase is always displayed, however the flowrate of this phase will be zero. The second phase is displayed because the stream is right at the boundary of the liquid-vapour region. When the stream is above the Bubble Point or below the Dew Point then o... |
Problem Statement: Is it possible to get the V7.1 cf.ear file and deploy it at your site without upgrading any other components or would the whole thing not work? | Solution: You cannot simply deploy the CF.ear file without converting Demand Manager and CF integration manager to the V7.1 level. To support CF it is expected DM and CF should be at same level. The upgrade path must be followed for other components also (DM, CF integration manager) which are defined in the documentati... |
Problem Statement: As Hysys calculates cetane index using a proprietary method, how do I calculate cetane index using ASTM D 4737 - 96a method? | Solution: Cetane index calculation in Hysys is performed using a proprietary method. If you are interested in calculating cetane index using ASTM D4737 - 96a method, follow the steps below:
Download the attached CetaneIndex.huv file and save it.
Open your Hysys case and go to Simulation menu and click on submenu Import... |
Problem Statement: What are the possible flow regimes reported by the Slug Tool and how are they calculated? | Solution: The Slug Tool in HYSYS is used to predict slug properties for horizontal and inclined two-phase flows in the Pipe Segment. The Slug Tool is accessed from the Pipe Segment Properties View on the Performance\Slug Options and Performance\Slug Results pages.
The Slug Tool works by finding travelling waveSolutions... |
Problem Statement: After converging a column, running the column again from a different starting point or after it is reset results in the column converging to slightly different | Solution: s. The range of theSolutions can be up to 10% of the variable of interest. How can I ensure that the column converges to a consistentSolution?Solution
This may occur when the Modified HYSIM Inside-Out Solver has been selected. It is usually observed when a heat duty is the variable of interest in the column. ... |
Problem Statement: Sometimes there is a difference in the order of the components as they have been added to the simulation to what is being displayed on the workbook. This is due to a hidden Master Component List in the code. In older versions, on the Basis Environment | Components tab, there used to be a default comp... | Solution: The best way to handle this in current versions is to Add the Phase Component Mole Fraction and then select the Overall Phase and select the All radio button. This will include the components in the current fluid package used for the stream and only the associated components. More importantly they will be dis... |
Problem Statement: Why is the Hydrate Formation utility is not available for all property packages? | Solution: The hydrate models incorporated into Aspen HYSYS are based on the work done by Ng and Robinson. Parameters for these hydrate models were developed with the use of the Peng Robinson equation of state. It is therefore not appropriate to use these models with other property packages as the hydrate formation resu... |
Problem Statement: In the tray sizing utility, tray flooding results table, what does the term flood capacity refer to? | Solution: The flood capacity is an empirical value calculated by a formula that includes tray spacing, vapor density and foaming factor. It is used to calculate the percent flooding according to the formula below:
%FLOOD = (VLOAD + GPM * FPL/13000)/(AA*CAF)
VLOAD = vapour loading (ACFM)
GPM = liquid phase flow rate (GP... |
Problem Statement: 1) How does the compressor in Aspen HYSYS interpolate amongst performance curves?
2) How does Aspen HYSYS extrapolate compressor curves to stonewall (for Dynamics)
3) How does Aspen HYSYS interpolate the performance curves amongst different Inlet Guide Vane (IGV) angles (for Dynamics)? | Solution: 1) When multiple curves at different speeds are provided (for example three curves for 9000 RPM, 11000 RPM and 13000 RPM), and given the flow, F, the first step is to calculate the Head and Efficiency for the given flow (for each of the three curves) using a Cubic Spline Method.
With the resulting three pairs... |
Problem Statement: You are attempting to load a subroles.txt file into Collaborative Forecasting and all subroles cannot be loaded into CF, receiving Oracle error : '1000 ORA-01000: maximum open cursors exceeded. | Solution: This problem is due to the number of open cursors not being set correctly. The Open_Cursor setting in SQL needs to a number greater than the number of subroles to be uploaded into CF.
There are two possibleSolutions to this, depending on how the DBA there has Oracle set up.
If you are using spfile they ne... |
Problem Statement: In the Aspen HYSYS components database, the following sulphur components can be found: S_Rhombic, S_Monoclinic, S_Amorphous, S_Liq_150, S_Liq_190, S_Liq_280 and S_Vapour. What is the difference between them? Which one should I use in my simulation? | Solution: Monoclinic, amorphous and rhombic: those are defined as solid components and therefore they are NOT included in any vapor liquid equilibria calculations. There are some differences in the heat of formation of these different crystalline forms of sulfur.
S_Liq_150, S_Liq_190 and S_Liq_280: the viscosity of liq... |
Problem Statement: When you try to open the Aspen Utilities Planner (AUP), the program displays the error message below:
***WARNING MESSAGE: No Compatible version of Aspen Properties installed. The Aspen Properties GUI will not be available*** | Solution: This error message, as it shows, is related to an incompatibility issue between the AUP version and the Aspen Properties package version selected to be used in such program. In order to select the appropriate Aspen Properties package, the Aspen Properties Version Selector has to be used. Go to Start | All Pro... |
Problem Statement: Time periods on the Create Override: Options screen are selected for certain dates (Example: Jun 09 to Dec 09) but when viewing the Create Override: Values screen all periods are open for overrides.
Time periods for override displayed are Jun 07 to Dec 09 | Solution: Set the DEFAULT_TIME_FENCE_OPEN statement in the property.ini file (C:\bea\user_projects\domains\aspencf\rc\property.ini) to one of the following:
True (DEFAULT_TIME_FENCE_OPEN = true) - all periods are open.
False ( DEFAULT_TIME_FENCE_OPEN = false) - allows updates within the time fence specified in Create O... |
Problem Statement: I've added additional components to the Master Component List but they don't appear in my simulation. | Solution: The Master Component List contains every component that has been added to all component lists in a Aspen HYSYS case. However, since the Master Component List is not associated with any Fluid Packages, components which are added to the Master Component List will not appear in the simulation because a simulatio... |
Problem Statement: How can I export utility summary to Excel? | Solution: The utility summary can be viewed under Flowsheet Summary| Utility Summary tab. However there is no option to export to Excel in the Flowsheet Summary page.
Other than copy and paste, the workaround is to create a Report first, then export the results to excel.
Following are the steps:
1. Create a Report... |
Problem Statement: How do I access the Relief Valve through automation? | Solution: Currently in HYSYS the Relief Valve unit operation is not wrapped and therefore the VB objects are not available in the HYSYS type library. However, you can access the relief valve via Backdoor variables, by knowing the HYSYS internal labels (called Monikers) for the various properties.
The attached example g... |
Problem Statement: When attempting to upgrade Aspen Collaborative Forecasting (CF) it fails using cf integration manager.
Evidently it is looking for C:\Data\CF\cVX_integ\dm\control\bean_sheet.txt and can't find the file. After checking the folder location the file does not exist. | Solution: Bean_sheet.txt is generated through CF 7.1 media under C:\CF \cf_integ\dm\control folder; it is not generated through java code base.
When cf_integ folder (cvx_integ) is replaced when the new V 7.1 cf_integ folder part of upgrade process it is expected Bean_sheet.txt file to exist under C:\CF \cf_integ\dm\con... |
Problem Statement: How is pressure correction applied while calculating liquid density using COSTALD in HYSYS? | Solution: Cheuh and Prausnitz (Cheuh, P. L., and J. M. Prausnitz: AIChE J., 13: 1099 (1967); 115: 471 (1969)) method is used to correct the density of a compressed liquid in HYSYS. The following equation is used:
V = Vs (1+b)^(1/9)
where
b = f (Trm, Vm*, P, Psat, Tcm)
Tcm = critical temperature of mixture
Vm* = charact... |
Problem Statement: How to model line heaters in Aspen HYSYS? | Solution: You can use the Pipe Segment operation in Aspen HYSYS to model the line heater. Please read the attached article that explains how to model the line heaters.
Keywords: line, heater, pipe, segment
References: None |
Problem Statement: Rules of Dynamic Simulation | Solution: Through my experience in using HYSYS Dynamics and interacting with other users, I realized that there are many ways to do the same thing, and it is a matter of preference as to which way to go. One thing is common between the ways though; you need to fully understand the implications of your ways and how they... |
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