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Problem Statement: Why is the tube layout different in EDR Thermal and EDR Mechanical? | Solution: The EDR thermal program has a tube layout generated by an HTFS routine, whilst the EDR mechanical program has a tube layout generated by a B-JAC routine. These layouts will typically be different in terms of tube location and baffle cut location.
In typical-size units (larger), these differences are not sign... |
Problem Statement: How can I modify the Scenario Data notes from the PRD Design Booklet – Switchboard inside the Documentation Builder? | Solution: In the Documentation Builder, inside the PRD Design Booklet – Switchboard,
when you access the Scenario Data for a PRD,
you can see an entire section with notes for each scenario type. However, these notes are not editable:
To modify the information contained in these notes you need to do it directly from ... |
Problem Statement: What are the units of measurement that I have to use in the isotherm parameters in Aspen Adsorption? | Solution: The isotherm parameters are defined in the configuration block of the bed models. The Aspen Adsorption isotherm models are expressed as functions of either partial pressures or concentrations.
When you use Aspen Adsorption isotherm models for pure components or for multi-component mixtures, you must supply is... |
Problem Statement: How to report outputs from a model, to a tag in Aspen Online, if the variable does not exist in, or is not calculated by, the model unit ops. | Solution: When attempting to report certain model parameters or values in Aspen Online, the work flow is to create a Tag in Aspen Online, import a model variable, then link the Tag to the model variable. This will ensure that when the model executes, the value of that variable will be output to the linked tag. There ma... |
Problem Statement: How can I enter tube pass layout for symmetrical and non-symmetrical bundles in Aspen Air Cooled Exchanger? | Solution: Aspen Air Cooled allows symmetrical and non-symmetrical bundles to be entered, depending upon the data items that have been specified in the Input | Exchanger Geometry | Geometry Summary | Geometry. Symmetrical bundles will have the same number of rows per pass, whereas non-symmetrical bundles may not. Aspen ... |
Problem Statement: When I try to browse for a Datasheet which I just created, I am unable to locate it. What steps do I need to take to make a Datasheet accessible? | Solution: The general workflow for creating and deploying Datasheets is as follows:
1. Create new Datasheet or edit an existing one using Datasheet Definer application.
2. Save the *.xlsm file to the Datasheets folder in the Workspace library.
3. Assign Title and Class Views under Datasheet Properties. Keep in mind tha... |
Problem Statement: When adding a new Miscellaneous Tag in AspenWatch Maker, the message ‘HY000: ”IODEV#” invalid value for select record “Io-Groups” possible values are “IODEV#” or “IOGROUP# ” ODBC--call failed.’ can appear if the IODEV# is not correctly defined or a different IODEV# is selected. This | Solution: proposes a way to avoid this message by manually change the record on IP21
Solution
1.- On the IP21 administrator find the Def called IoGroupsDef, then expand this Definition and you should find a selector called Io-Groups. Expand this selector and please click on #_OF_SELECTIONS, this will allow you to see t... |
Problem Statement: Is there a way to report additional variables for all streams in Equation Oriented mode? | Solution: Equation Oriented mode does not calculate the same variables that Sequential Modular mode does. If you want to calculate and report additional variables, (e.g. pH, viscosity, surface tension, conductivity, etc.), you need to ask EO mode to do it by adding an Analyzer block. An Analyzer block can calculate pro... |
Problem Statement: What are the differences between the different types of louvers in Aspen Air Cooled Exchanger? | Solution: Louvers are used to provide process side temperature control and prevent damage to the bundle due to climatic conditions. Louvers affect the outside bundle pressure drop and the price estimate. They can be defined on Input | Exchanger Geometry | Unit Geometry | Accessories
The different types of louvers in t... |
Problem Statement: There are two “Automatic Pressure Assignment” options (Equalize All Versus Set Outlet to Lowest Inlet) in Mixer unit operation (figure 1). What are the suitable application scenarios of these two options?
Figure 1. Two “Automatic Pressure Assignment” options in Mixer unit operation. | Solution: These two options’ definitions can be found through HYSYS Help (“Mixer from Help.pdf” help content is also uploaded in Attachments):
1) Set Outlet to Lowest Inlet (default setting), in which case all but one attached stream pressure must be known. HYSYS assigns the lowest inlet pressure to the outlet stream ... |
Problem Statement: When I try to copy & paste a column with internals, only the streams and specs are include. The internals information is lost. | Solution: In Aspen HYSYS, you can right click a column and copy and paste the column to another location in the flowsheet (or another flowsheet in a new simulation).
However, the new column will not include the column internals information from the old column. You will need to manually add them back if needed.
Keyword... |
Problem Statement: For Fire scenarios in Safety Analysis, the additional diameter that has to be specified is internal or external? | Solution: When running Fire scenarios in Safety Analysis, parameters for the vessel(s) must be specified, one of them being the diameter. However, it is not specified if this should be inside or outside diameter.
For an API Wetted fire calculation, the diameter should be the outside diameter. For a Semi-dynamic or Su... |
Problem Statement: Are the Notes made on the different PSV forms in the Safety Analysis environment transferred to the Documentation Builder or the Built-in reports? | Solution: When sizing or rating PSVs in the Safety Analysis environment, it is possible for users to make notes on the ‘Scenario Description Notes’, ‘PRD Notes’ and ‘Rating Notes’ fields. The images below show the fields available for notes.
Notes will not be transferred to any of the Documentation Builder reports. On... |
Problem Statement: Is there a way to add combination of unit operations for thermal stage and catalytic stage in SULSIM? | Solution: HYSYS offers a Thermal & Catalytic Section combinations, allowing you to add a group of unit operations organized in pre-configured topologies to the flowsheet. These unit operations are already connected by streams in defined connections.
User can add these combinations from the Add Combinations group of th... |
Problem Statement: How do I create a table in Aspen Simulation Workbook (ASW)? | Solution: 1. In MS Excel, click on Organizer under Aspen Simulation Workbook ribbon.
2. In the Aspen Simulation Workbook Organizer, paste the variables in the Model Variables page by right-clicking and selecting Paste Variables from Clipboard.
3. Remove and add column header as desired.
4. Select the varia... |
Problem Statement: How to report the mass fraction profile in RadFrac dynamic modeling? | Solution: In Aspen Plus Dynamic modeling, you can report many column profiles by right click on the RadFrac column and choose different forms. For example, you can create liquid/vapor flow profile, liquid/vapor mole fraction profile, temperature and pressure profile, etc.
However, if you click on liquid or vapor mass... |
Problem Statement: How to start using Visual Basic (VB) with InfoPlus.21 | Solution: From the Visual Basic editor within Aspen Process Explorer (APEx), there are two ways to access InfoPlus.21 with Visual Basic:
1. using ODBC/ADO calls, and/or
2. using InfoPlus.21 AtProcessData library
The Infoplus.21 AtProcessData library represents a collection of data sources, each containing a... |
Problem Statement: This | Solution: frames on the limitation that a DMC3 Builder Server has in supporting DMC Online Server.
Solution
Virtually there is no limit on the number of DMC3 Builder can support.
However, The Server CPU and I/O loading considerations are the main factor to considerer in determining how many servers a site may need.
Key... |
Problem Statement: Where can one specify percent over-design in Aspen Shell & Tube Exchanger? | Solution: By default, Aspen Shell & Tube Exchanger will try to design a heat exchanger with an Area Ratio (Actual Area / Required Area) equal to 1.0. Stated another way; Aspen Shell & Tube Exchanger will try to generate a configuration with 0% over-design. It is possible, however, to specify this value as a user input ... |
Problem Statement: Why does Aspen HYSYS Workbook not display information from BLOWDOWN flowsheets? | Solution: The BLOWDOWN flowsheet is different than the normal HYSYS flowsheet, not only in terms of solver but also in terms of display and configurations. Streams inside the BLOWDOWN flowsheet do not store any data, hence this is not displayed in the regular HYSYS workbook.
Some of the main data, such as the initial p... |
Problem Statement: How does HYSYS calculate the energy balance around a reactor? | Solution: Basically, the equations used are:
Feed Heat Flow = Hf Feed @ 25C + mCp*Delta T
Product Heat Flow = Hf Prod @ 25C + mCp*DeltaT
(where Hf Feed = Heat of Formation of Feed; Hf Prod = Heat of Formation of Products)
If: Feed Heat Flow = Product Heat Flow
Then:
Hf Feed + Feed(mCp*Delta T) = Hf Prod + Prod(mCp*Delt... |
Problem Statement: Is there a way to change the fouling thickness in Aspen Exchanger Design and Rating (EDR) Shell & Tube Exchanger? | Solution: The fouling thickness can be specified at Input / Program Options / Thermal Analysis / Fouling page.
Keywords: Fouling Thickness, Input warning 1121
References: None |
Problem Statement: Can a user specify excess percent surface area in Aspen Air Cooled Exchanger? | Solution: For an Air Cooler design to be acceptable, its actual surface area must be 100% or more of the required surface area for the specified duty and exchanger size.
Users can now (starting in V10.0) specify at Input | Program Options | Design Options | Optimization Options tab if the criterion is more than 100% (... |
Problem Statement: Gas Turbine vendors can provide multiply curves as a specification of the equipment. In Aspen Utilities Planner (AUP) user have 2 options to include specification of Gas Turbine (GT): by using temperature and humidity correction factors, or specifying multiply curves.
When one open Temp Table and Flo... | Solution: The tables in the Forms were created to simplify inputs, and include some variables related for example to Temp curves, of Heat Curves in separate places.
When creating Heat Curves tables NC_Heat value, which is used to represent number of heat curves was not included in that table. This value can be found i... |
Problem Statement: Aspen HYSYS compatibility issues with OLGA V6.x and higher | Solution: The OLGA software (specifically V6.x) has been completely re-coded and no longer supports the legacy OLGA Server. OLGA 6 uses an OPC interface, while OLGA 5 uses a specialized tcp/ip interface. Also a new OPC based server functionality was included and released in OLGA 6.2.6. But this is not tested with HYSYS... |
Problem Statement: The reported vapor fraction for the inlet stream to a fire-sized PSV is 1.0, even though it is supposed to be a V-L mixture. Why? | Solution: Whenever the relieving flow method for a fire-sized PSV is ‘Calculated’ when using the (API) Wetted calculation method, the Fire scenario reference stream will be taken to its bubble point and then the bubble point vapor will be the material to be relieved.
Therefore, the reported vapor fraction (Vf) of th... |
Problem Statement: How to modify Aspen HYSYS case built with oil characterization to open case without crude license error message | Solution: According to Article ID 30633, one of the reasons users will receive a crude license error message is when using the Oil environment.
The workaround is to delete all the hypo components in the simulation basis created by the Oil Manager. The hypo components created by the Oil Manager have IDs starting from 1... |
Problem Statement: What does Modify Tc, Pc for H2, He option in some equation of state fluid packages imply? | Solution: In Aspen HYSYS, when you choose some commonly used equation of state fluid packages (like Peng-Robinson, SRK or Sour PR), you will see the default option to Modify Tc, Pc for H2, He.
The default option Modify Tc, Pc for H2 and He uses a proprietary function to evaluate critical properties as a function of th... |
Problem Statement: There seems to be a reporting discrepancy on construction rental equipment costs. Equipment rental shows up on two different reports with two different values. The two reports are both Standard reports under Indirect Costs: Project Indirect Summary and Overall Equipment Rental Summary. What is the re... | Solution: The reason you might be getting different values in the two reports is likely due to entering Rental Equipment specs (as shown in attached screenshot) in the Contractors form or through the External Indirects file. The Overall Equipment Summary Rental will only provide the details for actual equipment being u... |
Problem Statement: How to check the crossflow fraction of the shell & tube heat exchanger? | Solution: In the figure above, only the crossflow stream B (and part of the window flow) contribute to the heat transfer.
Stream A is the primary leakage stream and passes through the shell ID to bundle OTL diametric clearance. It can significantly decrease the pressure drop and will also reduce the film coefficient.
F... |
Problem Statement: What is Liquid Residence Time Factor in a 3 phase real separator? | Solution: Liquid residence time factor is a tuning parameter which is used to adjust the carry over result closer to the reality data. The default value for this parameter is 1. When a higher value is specified, the separation between vapour (V) and light liquid (LL) is better. Please see an illustrative chart as shown... |
Problem Statement: Can you provide more information about units of measurement display in Aspen Plus for Aspen Custom Modeler (ACM) models?
For example why do I get a * character displayed instead of my custom units? | Solution: You will get a * rather than a unit in Aspen Plus if:
there is no mapping from your variable type to the Aspen Plus units table
your ACM variable's variable type has no physical quantity
In the first case, you can fix it like this:
In the OnNewDocumentScript.vb file, when you add a physical quantity the last... |
Problem Statement: How can I get the higher and lower heating values in units of BTU/ft3? | Solution: Currently the default units in HYSYS for the higher and lower heating properties do not include BTU/ft3. To use these units you must create a user unit conversion, as described in the steps below:
1. Select the Home Tab and click Units Sets from the Units section or Click in File/Options/units of Measure... |
Problem Statement: How does the Tube Rupture scenario in the Safety Analysis Environment calculate critical flow pressure? | Solution: The Tube Rupture calculation in the Safety Analysis Environment uses the Ideal Gas equation of state for critical flow pressure:
Where:
Pc = Critical Flow Pressure
Po = Relieving Pressure at the Low-Pressure Side
k = Rate of Specific Heats
Following the guidance of the paper PRV sizing for exchanger tube... |
Problem Statement: What should I do when HYSYS predicts two liquid phases for my stream (containing hydrocarbons) which I know for sure contains only a single liquid phase? | Solution: There are a few things that you could do to get around this problem:
You could make change to Stability Test to approach theSolution on a different route. In this case, since we know for certain that there is only one phase, you can switch the flash method to HYSIM Flash instead of the default HYSYS Low.
Foll... |
Problem Statement: How to view the true vapor pressure of a stream | Solution: If not shown, you can add the true vapor pressure to Stream / Properties. Click Append new correlation (the green cross in the bottom).
In the Correlation Picker window, under Standard, apply True VP at 37.8 C.
After that, the true vapor pressure will be reported in the Properties of that stream. You can ... |
Problem Statement: How many increments / elements are used in a pipe in Aspen Flare System Analyzer? How can I change it? | Solution: Increments in a pipe in Aspen HYSYS is called elements in a pipe in Aspen Flare System Analyzer. By default 10 elements are used in a pipe.
To change the number of elements for all the pipes, go to Calculations Settings Editor || Methods Tab || change the number of Elements.
To change the number of elements i... |
Problem Statement: Is it possible to automate importing CSV files into the data source in Mtell? | Solution: Ensure you have a CSV Sensor Data Source created and an appropriate file format configured for this data source.
On Mtell Server V4.3, navigate to C:\Program Files\Mtell\Mtell Agent Service\CSV (on V10 this is C:\Program Files\AspenTech\Aspen Mtell\Mtell Agent Service\CSV) and copy the CSV files to import in... |
Problem Statement: Where do I find additional documentation for Administration and Configuration help? | Solution: ABE includes a folder with documentation. Some of those guides includes information about Administrator tasks and ABE Query Editor script references.
The folder's default location is:
C:\Program Files\AspenTech\Basic Engineering VX.X\UserServices\Help
Keywords: Documentation, getting started, reference guid... |
Problem Statement: I have some old Access file (.mdb) from PSV Plus before it was acquired by AspenTech. Could I still apply them in Aspen HYSYS Safety Analysis? | Solution: If you have the Access file (.mdb) from PSV Plus, you could use the Conversion Tool to open it in HYSYS v.8.8 Safety Analysis.
In the Safety Analysis environment, click Customize tab, click and open the hided PSV Plus Conversion Tool:
In the PSV Plus to Aspen Hysys Conversion Utility, enter the name of the ... |
Problem Statement: Is there any other way to set a case besides going into each individual field's properties and set the case? | Solution: You can select all the fields, e.g. an entire column or row, and using the Edit | Case option from the Datasheets menu, define the case for all the fields at once.
For V10, use the Cases button to select the appropriate case.
Keywords: Datasheet Definer, multi-selection
References: None |
Problem Statement: What is a *.WWB extension file and how do I use it? | Solution: In Aspen HYSYS, the *.WWB extension file is a WinWrap Basic automation script that you write and execute with the Aspen HYSYS Macro Language editor.
If the you want to open the *.wwb file, please follow these steps:
1. In the Customize Tab, select Macro Language Editor command from the Tools menu.
2. The... |
Problem Statement: The zoom slider does not seem to be working for the time-based charts in AFR (capacity over time, pipe flow etc.). Is there another way to zoom-in for those charts? | Solution: The zoom slider in the bottom right corner works only for the flowsheet. Starting with AFR V10 CP4 (10.0.4), the zoom functionality has been added for all time based results. It only applies to the main graph and does not apply to the Lifecycle and ReSolution Step charts. Following are the steps to zoom-in an... |
Problem Statement: Why do some streams have the @ symbol before the name? | Solution: Streams with the @ symbol originate from a flowsheet that is different than the one you are currently in. Example: If you are building a controller in the Main Flowsheet and the process variable you require is an internal stream in the Column SubFlowsheet (T100), then the process variable will appear as Strea... |
Problem Statement: What methods are used to calculate the True and Pseudo Critical Properties ? | Solution: The true critical properties are the real critical properties of the stream determined thermodynamically by satisfying both the quadratic and cubic forms of the expansion of the Helmholtz free energy as a function of the mole numbers at a critical point.
[Details of this method can be found in the paper by He... |
Problem Statement: Why do I see discontinuity in the liquid density vs. temperature curve? | Solution: Density can be calculated by two methods: Costald correlation for pure liquid or Equation of State (EOS). Costald correlation provides high accurate result, especially for saturated pure liquids. Because Costald correlation was designed for saturated liquids, it is not applicable when temperature is at the cr... |
Problem Statement: What does Flame height lower than vessel elevation. No fire load generated message mean? | Solution: When running a Fire scenario in Safety Analysis, the message Flame height lower than vessel elevation. No fire load generated can appear.
According to API 521 6e (2014), any area higher than 25 ft is not subject to fire, so if the specified elevation of the vessel (or one of the vessels) is equal or higher t... |
Problem Statement: Is MABP for relief valve based on static pressure or total pressure? Should I use static pressure or total pressure to check it? | Solution: By default, MABP violation warning is based on static pressure. The user should use static pressure ONLY, but Aspen Flare System Analyzer gives the user an option to change if the user does not agree.
As mentioned in theSolution 000032086, the Total pressure is sum of the Static head and Velocity head.
Back... |
Problem Statement: Which property package should I use for supercritical region and dense fluid hydrocarbon? | Solution: The best method to use would be an Equation of state such as Peng-Robinson.
To emphasize on this matter, since an equation of state (EOS) should be used to calculate both liquid and vapor properties, it does not matter what phase the stream has assigned to it. Activity coefficient (phi/gamma) models should no... |
Problem Statement: After importing stream data from PRO/II into ABE, even though the stream is either full vapor or liquid, zeroes are shown for all attributes for the non-existing phase. Why? | Solution: Due to the way ABE maps PRO/II objects to ABE objects, in the case that imported streams from PRO/II had a vapor fraction of either 0.0 or 1.0, zeroes will be assigned to all attributes for the non-existing phase, since PRO/II internally assigns such values to the non-existing vapor or liquid phase when the s... |
Problem Statement: How to migrate Aspen Properties Enterprise Database from SQL Express to a Central SQL Server. | Solution: aspenONE Engineering products will use Aspen Properties Enterprise Database (APED) which can be hosted on SQLLocalDB or SQL Server Express on local machine or on Central SQL Server Database. If customer has initially hosted the database on SQL Express locally on user machine and wants to migrate to Central SQ... |
Problem Statement: Is it possible to add alternative names and CAS number for a component in a user properties databank? | Solution: To add parameters to an Aspen Properties Enterprise Database (APED) databank, you can use an Aspen DFMS input file (.inp). To add CAS number, you can use an Aspen MMTBS file (.dat). To add alternate name, you can use a .dat file called Synonyms.dat. Attached is an example for Methane (CH4), including
1) The ... |
Problem Statement: What property package do I use for an ammonia-water system at low pressure? | Solution: In the presence of an aqueous phase, the Sour PR or Sour SRK property package is usually recommended. These models are suitable for these conditions: 20 C - 140 C, up to 50 psi, < 65 wt % ammonia. Sour PR performs well with water partial pressure below 100 psi. User can also refer to F1 Help Menu for more det... |
Problem Statement: When attempting to run Aspen Plus Dynamics with Simulink (MCH.mdl example) the run fails with the following message:
Error evaluating 'LoadFcn' callback of M-S-Function block 'MCH/MCH Column
(Aspen Dynamics)'.
Caused by:
Server Creation Failed: Class not registered | Solution: When attempting to create a link between Matlab and Aspen Plus Dynamics, ensure that the Matlab version installed is 32-bit. Aspen Plus Dynamics is a 32-bit application and will not interface with a 64-bit program. The interface between Matlab and Aspen Plus Dynamics is created by Simulink. A file called AMSi... |
Problem Statement: Does HYSYS take into consideration the heat transfer from the air to the vessel? | Solution: At present no, the only energy transfer is from the mass of the vessel to the fluid.
Keywords: Vessel Heat Transfer.
References: None |
Problem Statement: I have set a zero-flow spec upstream of my valve and fully closed it, but the flow out is not zero. Why? | Solution: In Aspen HYSYS, the flow through valves is constant at Steady State, but if in Dynamic mode a non-zero flow is specified and enforced upstream of the valve (i.e. by setting a flow spec), the flow out of the valve will not be zero even if the valve is fully closed because the ‘Cv’ parameter will not be used. T... |
Problem Statement: Why has the controller given up on my CV(s)? | Solution: The controller gives up on certain CV(s) because there is no feasibleSolution of the current set of limits. The tunings tell the controller that this is a least important CV to give up on (check CV ranks).
Use Aspen Watch control objective function to determine which CV is more important than this CV.
Use you... |
Problem Statement: What is the best practice recommendation for cimio configuration of Aspen APC to Honeywell DCS? | Solution: The following recommendations can be used for cimio configuration of Aspen APC Server to Honeywell OPC.
1) There are two ways to connect using cimio for opc for Aspen APC to Honeywell OPC server. Select one of the two options below -
Option a) is to install cimio for opc on the OPC server
Option b) is to i... |
Problem Statement: I'm trying to model a scenario in HYSYS dynamics in which a control valve closes or opens within a specified time. Is there a method of simulating this event? | Solution: The Ramp Controller option in Event Scheduler can only ramp the SP of the controller. But in this case, we need to ramp the real open percentage of the vale directly. We use Transfer function to do this job.
In the attached example, there is a Transfer function block in HYSYS Dynamics to open valve VLV-102 f... |
Problem Statement: How can I include the results on the Electrolytes page of a stream on the HYSYS Workbook? | Solution: The key to add all the results under Electrolytes | Properties is simply to know the variable name associated to these values.
The table below shows the variable name which can be used in HYSYS to report this values in the HYSYS workbook or even in PFD tables.
Variable in Electrolytes page Variable name for... |
Problem Statement: How do I create a new drawing type? | Solution: We have different drawing types e.g. PFD and PPID diagram types but based on your requirement, you can customize new drawing types. The basic steps are listed below, which you can use as guideline.
Create a new diagram class
1. Launch Class Library Editor, and open the library that you are using.
2. From Ins... |
Problem Statement: When creating a new Aspen Mtell database, whether by using the database wizard from the Aspen Mtell System Manager, or by manually running SQL scripts, the database will fail to create if mirroring is enabled on the SQL Server with the error “Failed to execute SQL command – Unable to modify or set de... | Solution: This error occurs because SQL Server setups with mirroring do not allow individual users to be assigned a default database. This error occurs because the local “MtelligenceUser” username that is used for connecting to the MtellSuite database sets MtellSuite as the default database for the user when the script... |
Problem Statement: This | Solution: describes how to manually create the Aspen Mtell database by running scripts from SQL Server Management Studio instead of using the database wizard provided with Aspen Mtell.Solution
The scripts run by the database wizard can be found in C:\Program Files\AspenTech\Aspen Mtell\Suite\SQL Scripts. There are four... |
Problem Statement: Does RYield calculate adiabatic reactor temperature rise in Aspen Plus? | Solution: Yes. RYield calculates adiabatic reactor temperature rise.
For RYield, the duty is the difference between the inlet and outlet enthalpies. You do not need to specify heats of reaction. This is because Aspen Plus uses the elemental enthalpy reference state for the definition of the component heat of formation.... |
Problem Statement: I need to delete some of the assays displayed in the System Custom Library. There is an option to add assay, but not for delete them. Is there any way I can delete/edit the System Custom Library? | Solution: In Aspen HYSYS there is no interface for user to delete the assays from the System Custom Library.
One workaround is that if you have PIMS installed, you can use PIMS to manipulate the UserAssayLibrar.aal file.
Another workaround is to rename the UserAssayLibrar.aal file to UserAssayLibrary.afam file. The... |
Problem Statement: When manually running the first script when creating a new Aspen Mtell database, SQL Server Management Studio returns the warning message:
Warning! The maximum key length for a clustered index is 900 bytes. The index 'PK_ReliabilityGroupSite' has maximum length of 1530 bytes. For some combination of ... | Solution: This message is a warning generated by SQL Server that indicates a potential size issues when adding items to the database. This message is expected and the database will be generated with no issues, so these warning messages can be ignored.
Keywords: MtellSuite
References: None |
Problem Statement: Which shortcuts or hot keys can I use in the PFD? | Solution: Manipulate PFD shortcuts:
Page Up: zoom in small amount
Page Down: zoom out small amount
Home: zoom to show entire PFD area (while a unit is selected, Home Button will center the PFD around that unit)
Z: show previous PFD area
C (or '.'): center PFD on mouse cursor
Arrow keys: move PFD area small amount
<Shif... |
Problem Statement: Does Hysys take into account liquid formation across the depressuring valve (orifice)? | Solution: No, Hysys assumes that the fluid remains as a vapour through the valve (orifice).
Keywords: Valve, Orifice, Depressuring.
References: None |
Problem Statement: The concept of sub-units was used in V9 to model groups of components, within a Unit, using a sub unit. The sub-unit would contain more than one component and then would be in embedded in the Unit. In V10 there is no longer sub units or embedding. How do you then create the same component sub unit gr... | Solution: ThisSolution demonstrates and example of creating a sub-unit using the Free Layer option in V9 (MS Visio) and then embedding this Free Unit within a Unit object. This work-flow is then contrasted with the current unit diagram interface in V10 and the changes in Unit elements (Events) interactions that no long... |
Problem Statement: In this sample, you will learn how to use the Production Allocation Utility for systems with multiple suppliers for inlet feeds and track the individual supplier contributions to the resulting products. You will also understand the basis behind its calculations within a given sample case. | Solution: You will learn to:
Add the Production Allocation Utility
Review the feed stream contribution for the products
Understand the calculations performed by the Production Allocation Utility
The Aspen HYSYS case used as reference in the guide is also attached.
Note: The Aspen HYSYS Upstream license is required to ... |
Problem Statement: Microsoft frequently releases individual hotfixes for the Windows operating systems to fix defects and to patch security loopholes. End users often inquire whether or not these individual Microsoft hotfixes are compatible with the Engineering products. This knowledge base article describes AspenTech'... | Solution: AspenTech tests new versions of the Engineering products with the latest Microsoft service packs and Microsoft hotfixes which are publicly available from Microsoft when the testing cycle begins for a new release. After product testing is completed and the new Engineering version is officially released, no add... |
Problem Statement: The Aspen Security components store security/role information in cache files on the local client computer in case contact with the Aspen Security server is lost. These cache files are written to the computer using the client user's login credentials. However, some IT departments have restrictions whi... | Solution: The path to the Aspen Security cache files can be changed using the AFW Tools application.
To start AFW Tools go to:
Start | Programs | AspenTech | AFW Tools
AFW Tools displays Aspen Security setting information stored in the Windows registry. The path where the Aspen Security cache files are stored is displa... |
Problem Statement: Why are the units in my report different than those displayed in HYSYS? | Solution: In Aspen HYSYS V10, Reports tool can be accessed under Home Tab > Summaries Section. Reports Manager is the main interface to create report, as seen on the screenshot:
On the right side, under Printing Section, user can customize format options including units by clicking Format/Layout. Report Format and La... |
Problem Statement: Why does HYSYS display a standard gas flow for a liquid stream? | Solution: The reason that HYSYS displays a value of Standard Gas Flow for both liquid and gaseous streams is that the calculation is based on the molar volume of an IDEAL GAS at standard conditions (1 kgmol occupies approximately 23.644 m^3). So the molar volume is a direct conversion of the stream's molar flow rate. T... |
Problem Statement: What are the basic steps of Open loop tuning of PIDIncr? | Solution: The open loop tuning approach assumes that the process can be approximated by a first order lag plus dead time. Please follow these steps to execute open loop tuning for PID controller:
Open the PIDIncr controller Faceplate and set the controller to “Manual” mode
Open the “Tune” tab and select “Open Loop” ... |
Problem Statement: How to predict better viscosity for heavy oils? | Solution: Besides using Tabular properties, an alternative is to use the MacroCut Table available through HYSYS Petroleum Refining Features.
If you have a stream a crude stream and know the gas oil ratio, the water oil ratio, the stock tank density and the gas composition, HYSYS can calculate an oil composition and you... |
Problem Statement: If you did not define the feed and product stream variables correctly, sometimes you will get the following errors when trying to run adsorption models: “Initialization failed at time 0”, “Singular decomposition”. | Solution: The way you defined the variables is probably not very robust. In Aspen Adsorption, it is not recommended to set the product flow rate as fixed or initial. It is also not recommended to specify the feed flow rate and pressure while leaving the product pressure free. The specification status may give a warning... |
Problem Statement: How does the ‘Simultaneous | Solution: ’ solving method of the ‘Adjust’ logical operation work?Solution
The Adjust operation in Aspen HYSYS can solve multiple loops simultaneously by using the ‘SimultaneousSolution’ method. This solving method can be used when a set of manipulated variables in a specific object are to be varied simultaneously to m... |
Problem Statement: Is it possible to use SimSci Flare files in Aspen Flare System Analyzer? | Solution: Aspen Flare System Analyzer cannot read SimSci file and does not have a converter tool.
Please contact Schneider support team and verify if the SimSci file can be saved in a different format that Aspen Flare System Analyzer can read.
Keywords: SimSci, Converter
References: None |
Problem Statement: How can I control the Total Operating Cost obtained in Activated Economics in Aspen HYSYS or Aspen Plus? | Solution: The Total Operating Cost is the same value that Aspen Process Economic Analyzer (APEA) reports as Operating Labor Cost. For more information on what this value means and how it is calculated, please review article 46522.
While running the estimation inside Aspen HYSYS or Aspen Plus, the only parameter that c... |
Problem Statement: Do the HYSYS Pipe Segment and PIPESYS predict the temperature profile close to the wall? | Solution: The Pipe Segment and PIPESYS predict the bulk temperature profile, not the temperature profile across the pipe diameter.
To calculate the temperature close to the pipe wall, you would need a 2D or 3D finite element program and presently AspenTech does not develop such products.
Keywords: Pipe segment, PIPESYS... |
Problem Statement: Fittings equivalent length is not being considered for the calculation of total equivalent length, but only pipe straight length. Why? | Solution: After running a model, users may check the calculated total equivalent length of a pipe on the ‘Summary’ tab of the pipe block.
However, total equivalent length will be the same as pipe straight length (ignoring fittings equivalent length) every time the upstream source mass flow is zero. For sources with no... |
Problem Statement: How can I control all the significant digits for Pressure that appear on the Aspen Flare System Analyzer PFD? | Solution: When the user displays the Pressure results on the PFD, only two kinds of objects will display these values, Sources (valves) and Pipes, showing the pressure upsteam and downstream of each object.
To control the number of significant digits that are shown for any value in Aspen Flare System Analyzer, the use... |
Problem Statement: Why does No FlowPath Data For Source appears under Profile results in Aspen Flare System Analyzer? | Solution: Under the Profile results form of Aspen Flare System Analyzer (AFSA), the user can select any Source (Valve) to display a property profile that shows all the changes from the selected source and all the way up to the flare tip.
The profile is generated by identifying a single sequence of objects that connect... |
Problem Statement: Why are the units in my spreadsheet different from those in the rest of my case? | Solution: The spreadsheet has a feature where you can run a different unit set from your simulation - this could be useful when you are doing extra calculations that require a specific unit (i.e., emission calculations). If the units in your spreadsheet don't match those in your case, you can change the Units Set on th... |
Problem Statement: I have two streams with the same petroleum assay attached, but in one stream (Gasoline1) the user property (Sulfur Trial) appears empty and in the other stream (Gasoline2) is filled. Why is this happening? | Solution: In Aspen HYSYS, you can specify the Min. Def. Comp. field that is the minimum total composition that must have non-<empty> values for this user property in order for the stream value to be calculated. In other words, the summation of the NBP must be greater than the Min. Def. Comp. value (75% by default).
If... |
Problem Statement: By default, Aspen Mtell creates new databases in Microsoft SQL Server under the name “MtellSuite”. This | Solution: discusses how to create the database and associated .mdf and .ldf files under a different name.Solution
First, followSolution 46473 with instructions on loading the SQL scripts manually. Before running each of the scripts, change all occurrences of “MtellSuite” in the script to be the new desired name for you... |
Problem Statement: How to select Explosion Proof motor for pump in ACCE? | Solution: The Electrical Class Division set in either the Project or Area level in ACCE (this is not exposed in APEA) will determine whether explosion proof motor will be selected for pump motor.
In ACCE it can be set at the project level via the following:
Here are the defaults by Country Basis:
As an example, in th... |
Problem Statement: What triggers Message 18068 Dependent (variable name) response is suspicious, possibly a bad model? | Solution: The reason that causes Message 18068 to pop up is that the engine is detecting a wrong sign gain for that response curve.
Please note that this does not have an effect on the SmartStep MV moves but the data will be removed during the auto slicing process in Adaptive Modelling.
Keywords: Message 18068
Referenc... |
Problem Statement: What can I do to avoid having my original and copied reaction sets to change all the same when I make a modification on any of them? | Solution: The root problem of this odd behavior is that when reaction sets are copied in Aspen HYSYS, the name of the sets will be different and unique for each (i.e. Set-1, Set-2, etc.), but the reaction set folder is given the same name for all sets.
Therefore, for Aspen HYSYS, there is only one reaction set object,... |
Problem Statement: How do I organize the variables in the Aspen Simulation Workbook (ASW) Organizer? | Solution: It is possible to have a large number of model variables mapped into ASW Organizer and the variables may be from a single flowsheet or from different subflowsheets in an Aspen HYSYS case, and may be from global or any hierarchal level in a case of Aspen Plus. It is useful to group the variables according to t... |
Problem Statement: When will Aspen Flare System Analyzer consider the flow as compressible flow and what is the difference in the | Solution: method from incompressible flow?Solution
Compressible flow happens when the density of the fluid changes in the flow field (any flow with a Mach Number greater than 0.3 is considered compressible). The fluid mechanics of compressible flow is different from incompressible flow in the fact that the energy and m... |
Problem Statement: There are three Acid Gas Property Packages available in HYSYS. What is the difference between them? | Solution: HYSYS offers the following property packages for use with Acid Gas Cleaning:
The Acid Gas Chemical Solvents Property Package is used by the HYSYS acid gas cleaning workflow to simulate removal of acid gases such as Hydrogen Sulfide, Sulfur Dioxide, Mercaptans, and Carbon Dioxide from process streams. The work... |
Problem Statement: What is a Series-based Sensitivity Analysis and how do I set it up? | Solution: Unlike a standard Sensitivity Analysis, a Series-based study varies only one manipulated (independent) variable at a time and holds the other variable(s) at their respective base case values. This results in a significantly smaller output table. For instance, assume we select three independent variables, ea... |
Problem Statement: Can I use the HYSYS Optimizer in a Sub-Flowsheet? | Solution: The original Hysys Steady State Optimizer can only be used in the main flowsheet environment of a simulation case.
The HYSYS SQP optimizer uses a set of variables which are collected in a Derivative Utility. Variables from subflowsheets can be included in the Derivative Utility for use in this optimizer.
Keyw... |
Problem Statement: What methods are available to calculate polytropic head for a centrifugal compressor? | Solution: Head Calculation Methods
In Aspen HYSYS version V7.0, two new approaches are introduced for the polytropic head calculation: the Huntington and
Keywords: Schultz, Huntington,
References: methods. Both are described in detail in R.A. Huntington, Journal of Engineering for Turbines and Power, 1985. Both methods... |
Problem Statement: How to correct failed initialization for undersized choked valve? | Solution: In Aspen Plus valve design mode, although choked condition is detected but is ignored during valve sizing calculations. So, the sized valve has under-estimated valve open position (%). However, Aspen Plus Dynamics valve model accounts for choking effect. If the Aspen Plus simulation is exported in Pressure Dr... |
Problem Statement: What is the Mach Number Unit Operation Extension? | Solution: This extension calculates Mach numbers for a given pipe or stream. It has three modes:
Profile - Calculates a Mach number profile through a selected pipe. This is based on the mean velocity and local speed of sound at each point in the pipe.
Stream - Calculates a Mach number for a selected stream and a specif... |
Problem Statement: What is the preferred property mode for polymer system? | Solution: By default, for polymer system calculations, Aspen Plus Dynamics uses Rigorous properties calculation. Although “Local” is the default setting as global property modes, all polymer properties calculations are still done in rigorous mode.
Key Words
Polymer, Properties, Rigorous
Keywords: None
References: None |
Problem Statement: How to implement kinetic mechanism in Aspen Custom Modeler? | Solution: This example is based on ethane thermal cracking described in Folger Elements of Chemical Reaction Engineering. The details can be found in that book. The principle of the method is the Pseudo Steady State Hypothesis (PSSH), which may also be known as Quasi Steady State Approach (QSSA). The idea is that the r... |
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