question stringlengths 19 6.88k | answer stringlengths 38 33.3k |
|---|---|
Problem Statement: What are preliminary typical values for PID Tuning parameters (Kc, Ti, and Td) in HYSYS Dynamics? | Solution: The suggested preliminary values for Kc, Ti, Td are listed in the table below. These values might be used as a starting point to tune the PID.
Key Words
PID
Tuning parameters
Preliminary typical values
Keywords: None
References: None |
Problem Statement: How can the Convergence Monitor help? | Solution: The Convergence Monitor helps diagnose issues in convergence and solver performance. Users can use the Convergence Monitor tab of the Flowsheet Summary form to monitor convergence of your HYSYS simulation. Users can access this tool by clicking the View Convergence shortcut button in the lower left corner of ... |
Problem Statement: How does negative additive concentrations impact the objective function or profit in MBO? | Solution: In MBO, the total additive variable is multiplied in the objective function times the cost of the additive. This total additive variable is required to be greater than or equal to zero. This variable cannot go negative, therefore there can be no “profit” from using negative additive concentrations.
The additi... |
Problem Statement: How to troubleshoot error Failed to validate the | Solution: ID in PrSolutinoID table. Please run the model again and generate the report.
Solution
If by following the next steps you observe the error Failed to validate theSolutionID in PrSolutinoID table. Please run the model again and generate the report.
Open Volume Sample Model, turn AO on and run 2 cases the res... |
Problem Statement: How do I fix this error message “ CALCULATED PSD DOES NOT FIT INTO THE DEFINED MESH” ? | Solution: The following error occurs in any solid operation, often one where a distribution function is used to specify the outlet PSD, such as Granulator:
** ERROR WHILE EXECUTING UNIT OPERATIONS BLOCK: <id> (MODEL: <name>)
(DISPRP.13)
CALCULATED ... |
Problem Statement: What does this control panel message “SUBSTREAMS ARE AT DIFFERENT TEMPERATURES.
THERMODYNAMIC EQUILIBRIUM WILL BE ASSUMED FOR FURTHER CALCULATIONS” mean? | Solution: It is possible to specify in the Stream input a different temperature for the Solid substreams (CI Solid and NC Solid) than for the Mixed substream. However, not all blocks can handle this difference. Pressure must be the same for all substreams present in a stream.
If the block cannot handle the difference i... |
Problem Statement: How can I know which licenses are being used by the simulation case? | Solution: You can review the licenses that are being used by the simulation in File | About | Licensing Information. This window will show the name of the licenses that are being currently used, their expiration date and their location.
Keywords: Licenses, used, licensing, tokens
References: None |
Problem Statement: I can’t find the Aspen Plus calculator toolbar in 64-bit Excel | Solution: In Aspen Plus V10 and earlier versions, 64-bit Office is not supported. You need to install 32-bit Excel on your machine, then the add-ins (including the calculator toolbar) will be available.
Aspen Plus V11 is now a 64-bit program. Therefore, both 64-bit Office and 32-bit Office are supported.
For more deta... |
Problem Statement: After ACCE running complete, you may face typesetting issue on .ccp item report shown as below, item report row/column are not aligned as linear line but twist, then how to recover it back to normal alignment shown. | Solution: ACCE item report is a mono faced/typeset report. You can change the Ff back to Courier New/Regular/8.
Then .ccp item report will recover to normal typesetting as below shown.
Keywords: ACCE, .ccp item report, Typesetting
References: None |
Problem Statement: Best practices and guidelines for setting IO Flags for User Defined Entries in DMC3Builder.
Starting at V10, specific IO Flags (IsConstant and IsPublished) have been changed. The main change is that the AWRITE configuration does not longer need IsConstant IOFlag as TRUE. Keeping the old configurat... | Solution: Engineers can add user defined entries to a DMC3 controller. These entries can be used to augment the interaction between the controller and DCS, and they can be used as input or output or scratch pad variables for User Calculations.
All entries, including user-defined entries, have a set of properties that g... |
Problem Statement: In tube rupture scenario, where is the default value of flow coefficient (C) coming from? | Solution: For the flow coefficient (C), the default value used in HYSYS (0.74 when from tube to shell or 0.60 when from shell to tube) is as given in the paper:
Wong, Wing Y. PRV Sizing for Exchanger Tube Rupture. Hydrocarbon Processing (Feb. 1992), p. 59,
and the author's correction letter published on p. 44 in the Ma... |
Problem Statement: How accurate is the cost estimate given in EDR? Could I compare it with the quote from the vendor? | Solution: Yes, EDR’s cost section provides a simulation of a fabrication shop (welding, drilling, machining, grinding, milling, etc.). Fabrication shop efficiencies can be customized. The biggest unknown are material prices (based on customer’s location and material quantity purchased). EDR provides reasonable mater... |
Problem Statement: Are there the velocity slip correlations which are suitable for vertical downflow RPLUG reactors? | Solution: There is the method which is useful in the consideration of the slip. The Beggs and Brill method is a proper consideration. This can handle the slip and valid for vertical flow download. More details you can see in our Help menu (button F1), if you search for the next: Beggs and Brill Correlation.
Keywords: R... |
Problem Statement: What are the different types of compressors Aspen HYSYS can help model? | Solution: Aspen HYSYS allows users to model 4 types of compressors; Centrifugal, Reciprocating, Screw, and Wet Gas Compressor. Users can select the operating mode On the Design tab | Parameters page of the Compressor.
Centrifugal Compressor: This compressor is used to increase the pressure of an inlet gas stream with ... |
Problem Statement: Is it possible to add revision control to a library? | Solution: In the Class Library Editor, a revision can be set for a library. Only the current revision will be able to be modified.
The current revision can be closed at which point no further changes will be allowed to the library until either the revision is reopened or a new version is created.
To create, modify, r... |
Problem Statement: How to enable Marginal Cost calculation in Utilities Planner? | Solution: To enable Marginal cost calculation for fuel, steam etc, please go to
Optimization tab > Settings > Check the Marginal Cost Box
Then please go to each respective Header block and make sure “Include Marginal Cost” is set to True.
Key Words
Demand, Marginal Cost, Utilities
Keywords: None
References: None |
Problem Statement: In tube rupture scenario, why the pressure of the high pressure side is different from the pressure of the reference stream? | Solution: In HYSYS, the ambient pressure in the Safety Environment is maintained separately from the ambient pressure in the Simulation Environment.
To set the ambient pressure basis in the Simulation Environment, please refer to this Knowledge Base article:
How can I change the absolute atmospheric pressure basis in ... |
Problem Statement: Can I merge cells after a field has been placed in a cell? | Solution: When creating or modifying a datasheet in the ABE Datasheet Definer, do not merge cells after a field has been placed in a cell.
Instead:
1) Delete the field using the ‘Delete’ toolbar button.
2) Merge the cells left and / or up.
3) Add a new field to the empty cell.
Keywords: ABE Datasheet Definer, Field... |
Problem Statement: How to prevent Results Error 3008 “An inconsistency has been found when setting up a non-symmetrical bundle arrangement”? | Solution: As the message states, the error is related with some inconsistency in the bundle arrangement. Aspen Air Cooled allows symmetrical and non-symmetrical bundles to be entered, depending upon the data items that have been specified. Symmetrical bundles will have the same number of rows per pass, whereas non-symm... |
Problem Statement: Aspen Shell & Tube Exchanger has 2 Calculation Methods available: Advanced and Standard. With the Advanced calculation method (Input | Problem Definition | Application Options) you have control over the convergence parameters used for the calculations, something that is not available in the Standard ... | Solution: Under Input | Program Options | Calculation Options, there are 3 major parameters that can be changed to aid convergence.
In order of importance and usefulness, they are:
- Maximum number of iterations: In most simulations converge in a few tens of iterations. If a case does not converge, but there is a war... |
Problem Statement: Is the Preference file same for the Safety Analysis Environment and Aspen HYSYS? | Solution: Aspen HYSYS and Safety Analysis have different preference files. Aspen HYSYS preference file format is .PRF and Safety Analysis environment preference file is .SPRF.
Aspen HYSYS preference file (.PRF) is loaded/saved from the ribbon, click File | Options to open the dialog box for Aspen HYSYS settings. Users ... |
Problem Statement: Where can I find the list of APS calc unit built-in formulas and samples? | Solution: Calc units are similar to User-Defined unit, except that Calc units allow the user to define calculations internally (via the Calculations dialog box) rather than externally in the Units workbook (Units.xls). To find more information about built-in functions in APS calc unit, please refer to C:\Program Files ... |
Problem Statement: How does Aspen Capital Cost Estimator calculate freight cost for quoted items? | Solution: Aspen Capital Cost Estimator calculates the freight cost for a quoted item as a function of it's weight and cost associated with the contractor for the quoted equipment. By default, both the quoted equipment weight and contractor freight cost are 0. The contractor domestic freight cost can be adjusted under:
... |
Problem Statement: If I am asking Aspen Process Economic Analyzer to size my packed column instead of using the sizing information from the simulator, can Aspen Process Economic Analyzer use the actual packing type (ie SS Raschig Rings, SS Pall Rings, etc.) to affect the tower it sizes? | Solution: No. If you are letting Aspen Process Economic Analyzer do the packed tower sizing instead of letting the simulator size the tower, you can not size based upon the actual type (such as SS Rashig). You can tell it the type such as RANDOM or STRUCTURED, and characteristics (such as Packing Factor, Derating Facto... |
Problem Statement: What are some publications that discuss simulation and troubleshooting? | Solution: Listed below are some publications that are available from the literature.
Constant Volume problems
Horwitz, B. A., The Case of the Collapsing Can, Chem. Engr. Prog. June 1997, pp 61-65
Distillation
Kister, H.Z. Troubleshooting Distillation Simulations, Chem. Eng. Prog. 91, 63 June 1995.
Taylor, R., R. Krish... |
Problem Statement: Why cant I see the Add Heat Stable Salts option when using the Acid Gas Property Package in Aspen HYSYS? | Solution: Add Heat Stable Salts option appears when the components associated with Acid Gas Cleaning are included in the component list. These salts may be present in the amine treating process and can decrease the efficiency of the amine present inSolution. Therefore, you should add the HeatStable Salts to the simulat... |
Problem Statement: What is causing the log messages and what are some things that can be done to troubleshoot and fix the problem? | Solution: Per the log file, the scan and store processes in this example (OVOPC_SC and OVOPC_ST) are running on a Cim-IO server machine called Example1 but the last two lines in each stanza of the log above show that there is a problem with that name.
Try these troubleshooting suggestions:
1. From the Cim-IO server ... |
Problem Statement: How to make sure user defined “Absolute equation tolerance” value is incorporated in exported ACM model for Aspen Plus or Hysys? | Solution: Current ACM model export function does not include carrying user defined “Absolute equation tolerance” value. For example, it will carry default 1e-5 but not any new value of 1e-8. This may make the exported ACM model failed in Aspen plus or Hysys if it needs tighter tolerance for convergence.
The workaround... |
Problem Statement: Does EDR report the axial thermal expansion in operation? | Solution: Yes, it does.
On a fixed tubesheet unit, transfer data from thermal to mechanical (or input the data in mechanical).
Select Yes as shown below:
Run the mechanical program.
In the tubesheet section, Code details, find the ‘axial expansion’ for each operating load case (4 shown below):
Key Words
EDR
Aspen S... |
Problem Statement: What is the benefit of using Line Sizing Manager in Aspen HYSYS V11.0? | Solution: Starting from Aspen HYSYS V11, Line Sizing Manager allows users to perform line sizing calculations for multiple streams and process lines. Users can design and evaluate piping based on criteria that checks certain flow parameters, such as maximum pressure gradient or a maximum velocity. The Line Sizing Manag... |
Problem Statement: Which Physical Property Database and Property Method should I use to generate the physical properties in my EDR model? | Solution: All the modules within the EDR suite (Shell and Tube, Plate Fin, Fired Heater, etc.) are compatible with three different types of database systems as listed below:
1. B-JAC database
2. COM-Thermo database
3. Aspen Properties database
The B-JAC database is a legacy database that comes from the Hetran program... |
Problem Statement: How to get total energy exchanged with environment for Cyclic process? | Solution: If exchange energy with environment is enabled in “Energy Balance” tab, you can right click on Gas Bed > Forms > Report and get the exchanged energy reported.
The B1.Cycle_Total_Energy refers to total energy exchanged at current cycle while B1.Total_Energy refers to cumulative energy exchanged during completi... |
Problem Statement: HYSYS Case crashing while saving or case crashes while trying to modify something in simulation environment or in the basis environment. | Solution: HYSYS case files can get corrupted sometimes, since HYSYS files are saved as binary files. As a result of corruption, the case which was working fine until the last time you worked on it can crash while saving or trying modify the case the next time. A simple work around for this problem is as followed.
1. ... |
Problem Statement: How to include energy released with Blow downstream to be accounted for in Boiler overall efficiency calculation? | Solution: All the earlier versions before V11, energy associated with blowdown stream was not included in Boiler overall efficiency calculation. In V11, users can decide whether Blowdown energy to be included or excluded for Boiler efficiency calculation.
Please select the option from “IncludeBDinEff”
Key Words
Boiler... |
Problem Statement: How to rectify issues with envelope calculations when using the Tabular Package option on Aspen HYSYS? | Solution: Please download the attached article which highlights some best practices while using the tabular package option on HYSYS. In some instances, users may have issues while performing envelope calculations. This article will go over why this occurs and how this may be avoided.
Keywords: Tabular Package, Envelope... |
Problem Statement: How do I add sulfur content as a user property in HYSYS Oil Manager? | Solution: Sulfur can be added to Oil Manager assays by creating a user property.
1) Add a new user property:
2) Select the correct Basis and Unit Type for your data (In this case, sulfur is defined as a wt% vs. assay wt%.)
3) Under ”Edit User Property Values” enter a value of 0 in the Property value cells for all lib... |
Problem Statement: Why is the tubeside pressure drop calculated differently between Aspen TASC and Aspen Exchanger Design and Rating (EDR)? | Solution: In Aspen TASC (sunsetted on 2008), the friction factor used to determine the pressure drop is based upon commercial tubes.
Starting with Aspen TASC+ (released on 2006), and subsequently renamed Aspen Shell & Tube Exchanger (EDR), the default value for the tube surface relative roughness is Smooth, which is wh... |
Problem Statement: A shell and tube exchanger consists of a bundle of tubes located inside a cylindrical shell. The arrangement allows heat transfer between a fluid flowing through the tubes and a fluid flowing over the tubes. The latter flow is usually directed by a series of traverse baffles in cross flow over the tu... | Solution: Due to the by-pass that occurs due to the constructional gaps for assembly, only a portion of the total shellside flow passes over the bundle in crossflow. The flow on the shellside of a baffled exchanger is complex and is shown in the figure below:
The various flow streams are shown where sometimes they ha... |
Problem Statement: When using the h21chgpaths.exe utility to alter the history fileset paths to reflect a new location, the result is simply to list the usage. No changes appear to be made:
eg.
h21chgpaths.exe C:\Program Files\AspenTech\InfoPlus.21\c21\h21\ E:\Archive\
Results in:
Usage: h21chgpaths old_string new_str... | Solution: The problem is caused by the fact that the backslash character (\) is acting as an escape character when it precedes extended characters like the double quote symbol.
You should replace the trailing two character combination (\) with just the double quote symbol (). Eg. For the example above, change it to rea... |
Problem Statement: How to create a user variable in ACM products? | Solution: For many instances, we may need to create a dummy variable for ACM, Aspen Plus Dynamic or in Aspen Adsorption. For an example, if we need to create a new variable for Energy demand which does not exist in any units in the flowsheet. In that case, we can go to Flowsheet > Constraint and declare the variable as... |
Problem Statement: Error message “Stream Feed1: Dynamic flash not possible with current (insufficient?) specifications” when running the depressuring tool at some time in Aspen HYSYS? | Solution: To get rid of the error message, what you would need to do will be:
1. When the feeder block pops up, select the temperature radio button. Then, press the Export Conditions to Stream button.
2. Close the feeder block window.
3. Run the depressuring utility again - it should run fine now.
Keywords: Aspen HY... |
Problem Statement: How are sequential modular (SM) optimization problems solved in Aspen Plus? | Solution: You can use the Optimization feature to maximize or minimize a user-specified objective function by manipulating flowsheet variables. Equality or inequality constraints may be imposed on the optimization.
Optimization problems are solved iteratively. By default, Aspen Plus automatically generates and sequence... |
Problem Statement: When open excel related functions in APS, it gives error “programmatic access to visual basic project is not trusted”. This error message could be related with excel trust settings for VBA. | Solution: To solve error “programmatic access to visual basic project is not trusted”, please follow the steps below to change trust center setting in excel:
1. Open Excel and go to File, click Excel Options
2. Click Trust Center
3. Click Trust Center Settings
4. Click Macro Settings
5. Click to select the Trust acces... |
Problem Statement: How can I allow multiple users to get access to Equipment Model Libraries and Unit Cost Libraries files? | Solution: A simple workflow to allow multiple users to access the same Equipment Model Libraries and Unit Cost Libraries files, is to place the libraries in a shared network drive so that all can access them.
The following information will show you how to relocate Equipment Model Libraries and Unit Cost Libraries on a ... |
Problem Statement: Is it possible to model a dephlegmator in Aspen Exchanger Design and Rating (EDR)? | Solution: A dephlegmator is a device arranged for the partial condensation of a multicomponent vapor stream. The vapor stream flows vertically upwards and the condensate (condensed vapor) runs back down under the influence of gravity. The vapor stream and condensate thus move countercurrently and are in direct contact ... |
Problem Statement: How to modify user defined isotherm for 2-D spatial Dimension? | Solution: For Built-in isotherm, when 2-D spatial dimension is selected, both axial and radial nodes are automatically adjusted.
However, for user defined isotherm, we need to first select the number of radial nodes:
Then in isotherm equation need to write loading equation for each node (except first and last node):
... |
Problem Statement: How can I close an Item Report? There is no Cancel or OK button available. | Solution: To close the Item Reports that are on the list view you will need to select the X button that is located just below the X that closes the entire program:
Using this button will allow you to avoid the accumulation of reports on each Window you use.
Keywords: Accumulation, Close Item Reports, ACCE, AIPCE, AP... |
Problem Statement: I want to define my own Economic Evaluation (EE) templates, however, I want them to be saved in a different location than the default folder. How can I do that? | Solution: The default location where the Templates are saved is C:\ProgramData\AspenTech\Economic Evaluation VX\EE_Templates (where X stands for the installed version). The user has the option to define their own template folder location. To do so, follow the next steps:
1. Open EE (Aspen Capital Cost Estimator... |
Problem Statement: Do the Aspen Economic Evaluation products have backup copies of my projects? | Solution: Yes, the Economic Evaluator products do have backup copies of your projects. You can see the location, and change it if you would like, by going to the Locations tab on:
Tools | Options | Preferences
Under the Other Locations Specifications area, scroll to ProjectBackupDir and click on it. The location fo... |
Problem Statement: When is the option “Use separate Outlet Nozzles for Hot/Cold side Liquid/Vapor flows” on the Shell Side & Tube Side Nozzles section useful? | Solution: The option “Use separate Outlet Nozzles for Hot/Cold side Liquid/Vapor flows” on the Shell Side & Tube Side Nozzles section is set to ‘No’ as default, however, this option must be changed to ‘Yes’ when the outlet is expected to have both phases and need separate nozzles.
The program will throw the Input Erro... |
Problem Statement: What tube rows does Aspen Shell & Tube Exchanger consider for the vibration analysis? | Solution: The risk of vibration in any tube in an exchanger depends on where it is supported, by baffles or other supports, and on local flow velocities along its length.
Experience has shown that there are certain tube rows within an exchanger that are most likely to suffer vibration damage. These are basically the u... |
Problem Statement: When using Aspen Shell & Tube Exchanger, users need to specify the shell type of the exchanger as part of the geometry inputs, under Input | Exchanger Geometry | Geometry Summary | Geometry tab.
This technical | Solution: contains a description of the different shell types available in the program, along with some general guidelines for selecting the shell type when designing a shell & tube exchanger.
Solution
Shell types for a shell and tube heat exchanger are identified by a letter, i.e. E, F, G, H, I, J, X and K, designat... |
Problem Statement: What is the experimental / literature data against which the TEG-Water binary parameters of the CPA model were regressed? | Solution: The TEG-Water system binary parameters of the CPA model were regressed against the data presented on the following publication:
‘GLYCOL-TYPE GAS DEHYDRATION AND HYDRATE INHIBITION SYSTEMS - DESIGN AND ENGINEERING PRACTICE’
DEP 20.04.10.10-Gen.
Dec-94
Published by Shell
With the following validation results:... |
Problem Statement: How can I comment rows or columns in EIU spreadsheet? | Solution: In some cases, we may need to comment some of the entries in EIU template to disable some data from importing to staging tables. Both rows and columns can be commented in EIU spreadsheets.
An asterisk (*) before any column name tells the application to ignore any value in that column and not to load the data ... |
Problem Statement: How to create MTMF and MTMR correlations in Aspen PIMS? | Solution: Mobil Transformation ABML correlation is used to predict the research and motor octane numbers of motor gasoline (MoGas) blends. This method uses measured research and motor octane of components and measured olefins, aromatics, and paraffins.
ABML Function:
· MTMR
· MTMF
MTMF and MTMR correlations n... |
Problem Statement: How to calculate a grouped composition? (eg group all the C6+ hydrocarbon components) | Solution: This can be easily accomplished with an User Variable. Please follow the next steps and add the attached code to an Aspen HYSYS simulation:
In a simulation open any material stream and go to User Variable.
Click on “Create a New User Variable” button and copy/paste the code attached.
Type “PostExecute” for ... |
Problem Statement: Why is my building cost not changing as I increase the Explosion Gauge Pressure? | Solution: The building models in Aspen In-Plant Cost Estimator (AICE) are very simplistic models, basically driven by $/SF. Some of the fields are really information fields, so that in the reports people will know the various things about the buildings. The Explosion Gauge Pressure field is one of those fields (so is... |
Problem Statement: Many times, when writing models in Aspen Custom Modeler that use Aspen Properties, component property parameters are needed to perform detailed calculations. How do you access the pure component parameters in order to use them in model calculations? | Solution: Pure component property parameters can be retrieved using physical property procedure calls. For non-temperature-dependent parameters, the procedure is pParam. The pParam procedure input variables are the parameter name and data set number. The data set number will normally be 1, but could be 2 or greater if ... |
Problem Statement: Using heat loss in RadFrac is not supported by Aspen Dynamics | Solution: If you use Heaters and Coolers option in Aspen Plus and add Heat Loss for the RadFrac column, then you won’t be able to run the model in Aspen Plus Dynamics.
Using heat loss is not supported by Aspen Dynamics, so the constant heat duties are not included in the energy balance equations. Currently, the option... |
Problem Statement: In Aspen Shell & Tube Exchanger, in addition to the common TEMA shell types, users can also model double-pipe (D-shell) and multi-tube hairpin exchangers (M-shell). This | Solution: explains the differences between these types of exchangers.
Solution
- A double-pipe exchanger is one pipe enclosed by another tube to form an outer annulus. Fluid then flows, normally in counter-current flow, exchanging heat across the tube wall:
Double-pipe exchangers tend to be used for small duties as t... |
Problem Statement: The Safety Analysis environment is calculating a wrong vapor fraction for my relieving stream. It does not match the vapor fraction from the Simulation Environment. This is causing the calculated orifice area to be incorrect. How do I fix this issue? | Solution: 1) Select the scenario from the left navigation window
2) View the Scenario Setup tab
3) For Relieving Temperature, click the drop-down option and choose Vapor Fraction
4) In the input box which appears to the right, enter the vapor fraction
5) The new relieving temperature should then calculate
Keywords:... |
Problem Statement: What are the necessary permissions to see and delete cases in V11 PIMS Database Management Tool? | Solution: The user needs to have EXECUTE permission on stored procedure DeleteSolutionCase that is in the PIMS database.
To grant EXECUTE permission, do steps taken from Microsoft website:
To grant permissions on a stored procedure
In Object Explorer, connect to an instance of Database Engine and then expand that ins... |
Problem Statement: How do I change the default Aspen Process Economic Analyzer (APEA) template used through Activated Economics in Aspen Plus/ HYSYS? | Solution: Activated Economics in Aspen HYSYS and Aspen Plus always uses an APEA template file (*.IZT) that allows the economic evaluation to correctly process the project information, such as country basis, unit set, currency, operating costs, wage rates, design requirements, etc.
Several IZT files are already include... |
Problem Statement: How to use APS automation to update parameter values of an existing event? | Solution: Following is a VBA example that can be used to update event parameters.
======================================================
Sub updateparam()
Dim evntcoll As New orion.EventsColl
Dim evntitem As orion.EventItem
' Get the event by sequence number
Set evntitem = evntcoll.ItemByEventSeq(11)
' get parameters s... |
Problem Statement: How can I establish the relationship among variables in my dynamic model to customize the way calculations are performed? | Solution: You can define the following in a flowsheet constraint definition:
Variables
Parameters
Equations and procedure calls
Assignments
Inequalities
You can use the flowsheet constraints section to write any equations that include variables from different blocks on your flowsheet, thus customizing your model from ... |
Problem Statement: How is the pH calculated when using the Sour Water Property package? | Solution: The pH value is calculated based on the activity of the ions in the sour waterSolution. We have no pH data to validate the Sour Water package. There are only VLE data available, and the predicted VLE match the experimental data, thus, the predicted ion activity and pH value should be reasonable.
Keywords: Sou... |
Problem Statement: In Aspen Shell & Tube Exchanger, the program will calculate Rho*V2 values for both the shell and tubeside at different positions of the exchanger. Why does the program calculate and report these values? Where can I find the relevant TEMA recommendations? What happens if any of the calculated values e... | Solution: The Tubular Exchanger Manufacturers Association (TEMA) provides limits to minimize erosion of tube bundle components due to the high-speed flow in the exchanger, on both the shell and tubeside.
For erosion protection purposes, TEMA gives recommendations of ρν2 values at shell inlet/outlet nozzle, shell entra... |
Problem Statement: Can I use Spreadsheet import/export in a Pipeline Project? | Solution: No. Upon creating a Pipeline Project in Aspen Capital Cost Estimator (ACCE), the Spreadsheet import/export functionality will be disabled, so the data from these projects will not be available to export into MS Excel, the option will appear grayed out.
Since this function only works with non-Pipeline Project... |
Problem Statement: How can I ramp a variable in Aspen Plus Dynamics/Aspen Custom Modeler? | Solution: In Aspen Plus Dynamics/Aspen Custom Modeler, you can make the value of a variable change over a fixed duration of time by using the ‘ramp’ function. For example, you can heat up a stream to change its temperture from 30 C to 65 C in 10 min (of simulation time). Only input variables (‘fixed’ variables) can be ... |
Problem Statement: I would like to create my own custom P&ID library within Aspen Capital Cost Estimator (ACCE). How can I do this? | Solution: Follow these steps to create your own Piping and Instrumentation Drawings and libraries:
1) Open ACCE and make sure all projects are closed. You may close any currently active projects by hitting File | Close.
2) Go to the libraries tab in the palette window and double click on the P&ID icon.
3) Right click... |
Problem Statement: How is MBO component mapped to APS stream when using Copy from APS? | Solution: When the Copy from APS button is used, the mapping is done via stream name in APS and component name in MBO. For example, for comp ALKY to copy rundown rate from APS into MBO, APS must have a stream called ALKY.
Keywords: None
References: None |
Problem Statement: In the Shell & Tube Thermal program, there is no input field for Front (or Rear) head dimensions (e.g. length). Why is this? | Solution: In the Shell & Tube Thermal program, the main results are related to thermal performance (duty, outlet temperatures, etc.), hydraulic performance (outlet pressures, pressure drop, etc.) and vibration analysis. In these calculations, the front (or rear) head length does not have any influence to the results. A... |
Problem Statement: How to get the stream gas flow in cubic feet per minute (Cuft/min) in Aspen Plus V10?
Property = VVSTDMX, Units = cuft/min, Qualifiers: T = 60°F; P = 14.696 psia.
But, when user add this property to the Stream Report Table, it shows unit cuft/lbmol for all streams, not the stream flow in Cuft/min. I... | Solution: Open Aspen Plus simulation file in Aspen Plus V10
Click on Property Sets folder, click on Add button, select VVSTDMFL Property set
Add this property set in Setup - Report Options to see it in Result Summary - Streams
It shows unit as cuft/min” for all streams, Vapor phase property
Keywords: Cuft/min, VVSTDMX,... |
Problem Statement: Note: This problem was reported on a Windows 2016 Server with Excel 2016. This is a rare issue; it does not occur on most systems, regardless of Windows or Excel version.
With two or more GDOT applications configured for Model Update, the first instance of Model update will complete startup, with mes... | Solution: This problem occurs when Excel is unable to find or create the following directory:
C:\Windows\SysWOW64\config\systemprofile\AppData\Local\Microsoft\Windows\INetCache
When Excel is started by Model Update, Excel will create that directory if it is missing. If Excel is unable to create the directory, then ad... |
Problem Statement: How to run a case study? How to create a case study? | Solution: Go to the Navigation Pane and select the option “Case Studies” and click on “New”.
Set the dependent and independent variables, by clicking on the “Find Variables” button of each section.
Browse the variables from each stream or block.
Once the variables are set, provide the range (Start and end value), a... |
Problem Statement: What is the basis for the Reflux Ratio reported on the performance page of the Column Property view? | Solution: The basis for reflux ratio on the performance page is Molar basis and it is calculated including the vapor flow. It is calculated as shown below
Reflux ratio = NetLiq/Product flow,
where product flow = vapor flow + liquid flow.
Keywords: Column, Reflux ratio, Performance page
References: None |
Problem Statement: How to add Critical Properties to Workbook? | Solution: To add the critical properties, use the Object Type- Utility Objects - Critical Properties. Follow below steps for adding the properties.
1. First, add the Critical Properties Stream Analysis to the streams of interest.
2. Next, go to Workbook tab, Setup option. Add a new Tab, Object Type- Critical Properties... |
Problem Statement: Save sub-flowsheets as templates for possible use in future models. | Solution: Select the flowsheet that you want to create as a template. Do a right click, select Export to File. A *.hfl file is created and can be used when a Flowsheet Unit Operation is created in a case.
Open the file from Open\Case
The template can be converted using the Customize menu Option. Click on the Conver... |
Problem Statement: Why doesn't the pipe segment in dynamic model give the same flow or pressure drop as in steady state? | Solution: The pressure drop or flow rate in a pipe segment can give different results after converting from steady state to dynamic mode. In order to achieve a comparable results the user needs to check the following parameters:
1. Change the pipe flow model from Simple Pipe Friction Model Method to Pipe Model Corr... |
Problem Statement: When using Aspen Shell & Tube Exchanger program, users need to specify the rear head type of the exchanger as part of geometry inputs, under Input | Exchanger Geometry | Geometry Summary | Geometry tab.
This technical | Solution: contains some general guidelines for selecting a rear head type when designing a shell & tube exchanger.
Solution
The various rear head types are:
- L, M and N-type: These are for fixed tube sheet exchangers and correspond to the A, B and N-type front end heads. L and N types would normally only be used fo... |
Problem Statement: How can I use a non-constant ambient temperature for an adsorption bed? | Solution: Aspen Adsorption can consider heat transfer between the bed and the environment by specifying an ambient temperature. This “Tamb” variable is fixed, but it could change throughout the process.
To use a non-constant ambient temperature, you can create a Task that changes it at specific time intervals, or when... |
Problem Statement: Why for some isotherm lower bound of standard-state pressure (Poi) is fixed at 1e-10 bar? | Solution: For IAST isotherms like “Dubinin-Radushkevich with I.A.S” the lower bound of standard-state pressure is fixed at 1e-10 bar. This is hard coded in Adsim as a safeguard for the Log.
As a workaround, user can select I.A.S Henry 1 type isotherm which allows modification of lower bounds of Poi.
Key Words
Isotherm,... |
Problem Statement: How to get access to the list of unit operations in Aspen HYSYS through VBA Automation and apply type filters: | Solution: The following code illustrates how to get access the collection of unit operations and apply type filters to narrow the return set:
'Note: Aspen HYSYS Type library must be referenced under Tools ...
Keywords: VBA, Automation, Typename, Access
References: s
'Require explicit variable declaration
Option Expl... |
Problem Statement: What’s New in V11: Add Steel Fireproofing to Mill Building | Solution: Previously, steel fireproofing was not generated by default for the BSTLMILL BLDG plant bulk. Steel fireproofing specified at the project and area levels is now applied to the steel mill building as is currently done for open steel structures and steel piperacks.
Keywords: V11, new, steel fireproofing, mill, ... |
Problem Statement: I am trying to generate a combustion reaction for 1,1,2,2-tetrachloroethane (C2H4Cl4) in RSTOIC.
However, there is no combustion on the tetrachloroethane generated. Why is that? | Solution: If you use Combustion to generate reactions, components containing atoms other than carbon, hydrogen, nitrogen, oxygen, and sulfur are ignored. That is why you didn't get the reaction for 1,1,2,2-tetrachloroethane, because it contains chlorine.
I suggest you trying to explicitly specify the reaction stoichi... |
Problem Statement: On some Oracle systems, upgrading the Aspen Production Record Manager database using the Aspen Database Wizard will fail with the error: ORA-02429: cannot drop index used for enforcement of unique/primary key. At this point, the wizard will fail. Subsequent attempts to run the wizard will also fail. | Solution: In this situation, check the DatabaseWizard.log file to see which table the wizard was upgrading at the time of failure - see In which directory can I find a log file for the Aspen Database Wizard?
The following log file entries come from a system which encountered this problem.
ALTER TABLE ASPENBATCH21.cha... |
Problem Statement: In very rare cases, simulation file sizes can greatly increase due to ballooned ADS content. Is there a way to disable ADS reporting?
Description
Aspen Data Share (ADS) is a mechanism to transfer data between AspenTech applications. This can be turned-off, but will impact the following features (i.... | Solution: To turn-off, copy %LOCALAPPDATA%\AspenTech\ into Windows Explorer or similar. If you do not have an Aspen Data Share folder, create one and put the attached config.xml file there.
This will turn-off ADS reporting for both HYSYS and Aspen Plus.
Warning! Doing this will impact Activated Economic Analysis, AB... |
Problem Statement: How to add a reference to the Aspen HYSYS type library in VBA. | Solution: Before you can perform early binding with Aspen HYSYS or other Applications in our Engineering Suite, you should to add the corresponding type libraries that contain metadata with the type definitions.
In VBA, from the “Tools” menu, click
Keywords: ActiveX, VB, VBA, Visual Basic, Automation Server, getting st... |
Problem Statement: How do offset values for compressor performance curves work? | Solution: In Aspen HYSYS, you can enter offset values to build compressor curves in a simpler way.
The offset values will directly affect head and efficiency values of the specified performance curves.
If Head < 0, then the resulting head values for all performance curves will be calculated as follows:
Head (entered... |
Problem Statement: Does the Aspen HYSYS pipe segment follow the API 521 method including choking pressure determination for the sonic velocity calculation? | Solution: The pipe segment follows a different approach as Aspen HYSYS computes static, friction and acceleration pressure gradients (for some selected methods only) in different parts and then adds them to get a total pressure gradient.
Static pressure gradients consider choking and are computed performing equilibriu... |
Problem Statement: Which Mass Transfer Coefficient (MTC) method is most suitable for Pressure Swing Adsorption? | Solution: Most of the available MTC methods are applicable for Pressure Swing Adsorption processes. However, “Pressure Dependent Arrhenius” model accounts for changes of total pressure which is very characteristic of PSA systems.
The correlation has a pressure term and pressure adjusted pre-exponential factor. This mo... |
Problem Statement: How to convert Microsoft Access databases to SQL databases? | Solution: Prior to V11 release, the AUP used MS Access databases(.mdb) for configuring Optimization. Starting in V11, all Optimization configuration need to be done with SQL databases (.mdf). All existing .mdb formats need to be converted to .mdf for use in V11.
Here are the steps to convert:
Open the automatic convers... |
Problem Statement: Where is the ISBL/OSBL specification located in the Aspen Capital Cost Estimator (ACCE) software? | Solution: A Battery Limit is a boundary between two areas of responsibility, which may be physical or represented by a map coordinate.
ISBL = Inside Battery Limits
OSBL = Outside Battery Limits
To be able to see project Battery Limits information, follow the steps below:
1. Make sure that your project has a report gr... |
Problem Statement: What correlation does the pipe segment in Aspen HYSYS use to determine the sonic velocity for choked flow calculations when handling two-phase systems? | Solution: The correlation described in the KB Article ‘What criteria does the Pipe Segment use when checking for Choked Flow ?’ applies for both full-vapor and vapor-liquid mixtures.
Aspen HYSYS computes the fluid properties specifically for either a single phase or a mixture and then proceeds to perform the calculati... |
Problem Statement: What are the viscosity methods for two liquid phases in Aspen Shell and Tube Exchanger? | Solution: Depending on the nature of the process (single phase, condensation, vaporization) and the amount of each liquid phase present in the mixture, a different viscosity method may be needed. There are 5 options to choose from in Aspen Shell & Tube Exchanger, available under Input | Program Options | Methods/Correl... |
Problem Statement: What factors can cause EIU to disappear from Excel? | Solution: Excel Integration Utility (EIU) is an import function used to import event, inventory and assays data into APS/MBO application. EIU is installed as an add-in in excel. Sometimes you may find EIU disappears from excel, which could be related to the following reasons:
EIU is not property installed at the beginn... |
Problem Statement: How do I Turn off the costs associated with the Power Distribution and Process Control Systems? | Solution: A regular project in ACCE will automatically include certain elements to provide electrical power and process control to the plant. The user can, however, deactivate the costs associated to these elements in case these are not required in the estimate, the elements added by default in ACCE along with the proc... |
Problem Statement: Cost summary in the pipe rack bulk does not appear when evaluating locally within Aspen Capital Cost Estimator (ACCE). | Solution: Best practice for setting up Module Type PRMD (piperack) is to create an area where Area Type is set as ‘Module’ with the Module Type set as PRMD. The pipe rack plant bulk is specified in this Area so that pipe rack module details can be specified here. When running a local Evaluation on the pipe rack plant... |
Problem Statement: Is it possible to transfer simulation data from Aspen Plus or Aspen HYSYS user interface to Process Economic Analyzer? If yes, How? | Solution: Yes, it is possible to transfer simulation data from Aspen Plus user interface to Process Economic Analyzer. This article uses Aspen PLUS as the tool, however, the steps are similar for Aspen HYSYS as well.
Please follow the below mentioned steps to do this.
1. Open Aspen Plus simulation file. (You can ... |
Problem Statement: How do I import the fluid properties from an existing simulation in Aspen HYSYS? And what must be checked while importing this data? | Solution: To import the properties of an exchanger from Aspen HYSYS into EDR, do the following:
1. Open an existing EDR file or create a new one. Please note that just opening EDR is not enough, you need to open a specific EDR module (S&T, Air Cooler, etc.):
2. Within EDR, go to File | Import | Aspen HYSYS VX.X:
3. ... |
Subsets and Splits
No community queries yet
The top public SQL queries from the community will appear here once available.