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Problem Statement: It can be difficult to compare two different values for a specific point in time because even though two different tags may have history that matches down to the hour, minute and even second, the timestamps will rarely match to the 10th or hundredth of a second. | Solution: Here is an example script where the goal is to collect data from record a where the value is greater than 100 while at the same time the value of record b is between 1 and 2:
SELECT a.IP_Trend_Time,a.IP_Trend_Value FILLER PERCENT,
b.IP_Trend_Time,b.IP_Trend_Value Product
FROM mytag1 a,mytag2 b
WHERE b.IP_Tren... |
Problem Statement: Is it possible to open a Visual Flare or a UniSim file in Aspen Flare System Analyzer? | Solution: A Visual Flare (.vmf) file is part of Schneider Electric Software and a UniSim Flare (.ufnw) file is part of Honeywell and those types of files are not part of the Aspentech suite.
Nowadays it is not possible run a Visual Flare or UniSim file within Aspen Flare System Analyzer, since both have changed their c... |
Problem Statement: What does the petroleum property correlation ‘P Value’ measure? | Solution: Starting with V9.0, Aspen HYSYS reports ‘P Value’. This property correlation is a measure of the residuum stability and is often used for the visbreaker tars in a refinery. ASTM D6703 is used to measure the ‘P Value’.
This correlation is based on the test method, intended for estimating the colloidal stabili... |
Problem Statement: How can you model a delay orifice opening in BLOWDOWN? | Solution: To simulate a delay in the orifice opening in BLOWDOWN, you need to enter a small number for the orifice opening (for example 0.01).
The value can be increased later at the desired time interval.
Please note that this is only possible in Aspen HYSYS V10.
Keywords: Orifice, BLOWDOWN, delay
References: None |
Problem Statement: Can hypocomponents be merged into one in Aspen HYSYS? | Solution: There is no functionality in Aspen HYSYS to combine two pseudo components into one as you can do in Aspen Flare System Analyzer.
In Aspen HYSYS, each pseudo component has its own physical properties.
As a workaround, you can mix two streams with the hypos to obtain the mixture properties.
Keywords: Hypocompon... |
Problem Statement: What does the Recycle Advisor do in Aspen HYSYS? | Solution: In a HYSYS flowsheet the number of recycles and their locations significantly affect case convergence. In iterative solving, more recycles will make the case converge slowly, and will result in additional degrees of freedom which in turn will affect the robustness of theSolution. For these reasons, having jus... |
Problem Statement: What steps should be considered if there are difficulties in converging a distillation column or obtaining the required performance from the column. | Solution: If the column is not converging the diagnostic output generated in the trace window during the column iterations provides helpful clues on how the solver is progressing. If the equilibrium errors are approaching zero, but the heat and spec errors are staying relatively large, the specifications are likely dif... |
Problem Statement: Continuous List datasheets cannot be opened from Workbench (Legacy Datasheet editor). The error bellow appears
How can I view / use the continuous lists? | Solution: By design, Continuous List datasheets cannot be opened in Workbench (Legacy datasheet editor). The continuous list format is new, developed for Excel Datasheet Editor application and not retrofitted to Workbench. This is one of the advantages of using XLDSE.
These lists can be opened in ABE Explorer applic... |
Problem Statement: What is difference between Liquid Volume Percent and Liquid Percent Level in the Vessel? | Solution: Please find below the calculation details of these variables:
Note: For horizontal vessel, Liquid Volume Percent will be different than Liquid Percent Level if the Liquid Percent Level is not 50%. Refer to the following screenshot and attached Aspen HYSYS Dynamics file. The spreadsheet shows the Liquid Volu... |
Problem Statement: How does the program decide when is it necessary to perform the flash calculation for RPlug reactor in Aspen Plus? | Solution: The flash calculation is necessary except in simple cases where there is only single phase present and apparent approach is used (no electrolyte with chemistry is considered). If the scenario is more complicated, for example, if heat exchange is considered, flash may also be necessary even if single phase and... |
Problem Statement: Which components have Vapor Phase Dimerization or Association included in HYSYS? | Solution: The carboxylic acid vapor phase dimerization/association is accounted for, for the following components, if an Activity Coefficient Model is used for the liquid phase, AND the virial equation is selected as the vapor phase model. Please note that this applies to the listed components ONLY.
The components are:... |
Problem Statement: APC application will give an error All licensing tokens with the server for this feature are already in use even though there are enough overall tokens available in the SLM server | Solution: Each APC application can only take all the token required in one bucket. For example, if the application requires 20 tokens and the SLM server is configured such that bucket 2 has 15 tokens left and bucket 3 has 20 token left, the application would not run. If you look at the license log, you would see erro... |
Problem Statement: CimIO device green/red status indicators do not function correctly on a MES Clustered systems. | Solution: On a MES Clustered environment the CimIO_Gethostname will fail to retrieve the correct node name if the MESCluster\AdsaClusterNetworkName registry key is undefined. To resolve the issue populate the AdsaClusterNetworkName registy key with the cluster node name.
This can also occur if the CimIO Manager por... |
Problem Statement: How to change a ramp variable from a normal ramp to a Programmed Imbalance Ramp? | Solution: Note: if you are unclear about ramp imbalance & programmed ramp imbalance, please have a look at KB: 143542-2.
We assume that you already have a controller deployed & running online.
1. Go to the Web Interface (PCWS) and switch ON the master switch.
2. Navigate to Dependents & identify your ramp varia... |
Problem Statement: How do I ramp a gate valve with no controller?
For this specific sample, it is required to open a gate valve operating in manual (with no controller) from 0 to 100% in 50 minutes. How do I model this system in Aspen HYSYS Dynamics? | Solution: If you do not have controllers, an option would be to use the Event Scheduler to create an opening - closing event. However, Ramp Controller option in the Event Scheduler can only ramp the SP of the controllers. But in this case, we would like to ramp the real open percentage of the vale directly.
The recom... |
Problem Statement: Which versions of PIPESIM integrate with Aspen HYSYS? | Solution: PIPESIM has released the following versions since 2013:
Date Title
July 2017 PIPESIM 2017 released
November 2016 PIPESIM 2015.2 and PIPESIM 2012.4 released
November 2015 PIPESIM 2015.1 and PIPESIM 2012.3 released
December 2014 PIPESIM 2014.1 and 2012.2 released
August 2013 Released PIPESIM 2013.1 and 2012.1... |
Problem Statement: How to modify Free Radical and Ziegler Natta Kinetics in Aspen Plus Dynamics? | Solution: Both Free Radical and Ziegler Natta kinetics are supported in open kinetics format in Aspen Plus Dynamics. By default, these reactions are procedure based closed form. To enable open form, please follow:
1. Please go to Global > DynamicsOptions >GlobalPolMethod and select “Equation” option
2. When PolMet... |
Problem Statement: How do I get the Latent Heat for a mixture on Aspen Plus? | Solution: Since V10, you can use the property sets DHVLMX and DHVLMXMS to report the heat of vaporization for a mixture, on mole and mass basis, respectively, based on vaporizing 1% more of the liquid.
For V9 and earlier versions, you can set up a Flash2 at Operating (or Relieving) Pressure and Vfrac=0. Feed the liqui... |
Problem Statement: How to change the background color of HYSYS flowsheet? | Solution: There are two different background color options for HYSYS flowsheet. One background color option is white:
The other background color option is green:
If you want to change the background color, please go to File - Options – Simulation – Formatting. Choose “Default” for the white background color, and choo... |
Problem Statement: Can I control how many lines are being printed in the Trace Window? | Solution: Yes, object inspect the Trace Window and choose View Trace Properties.
You will be able to set the number of lines printed here.
Keywords: Trace Window, History Length.
References: None |
Problem Statement: Why is the remaining flow ratio not calculated by Petroleum Feeder? | Solution: The remaining flow ratio is not calculated by the Petroleum Feeder when no product stream is attached to the feeder. Make sure a product stream is connected to the feeder so it can calculate the remaining flow ratio to equal the sum to 1.
Keywords: Petroleum Feeder, Flow Ratio
References: None |
Problem Statement: How do I include Ambient Medium Velocity from a pipe segment in a case study? | Solution: To add Ambient Medium Velocity from a pipe segment in a case study, follow the steps given below:
1. Double-click the applicable pipe segment and go to the Rating Tab. Expand Heat Transfer on left and then go to Estimate HTC and Right-click Velocity (either the label or its value) and choose Copy (Ambient Me... |
Problem Statement: Why can't vibration analysis be performed for heat exchangers with rod baffles? | Solution: The vibration risk with rod baffles only arises due to limited crossflow near the inlet or outlet. In general, risk of vibration in this type of exchangers are a lot less than baffled exchangers.
It is very unlikely that a rod-baffle unit could suffer from vibration. Over the vast majority of the tube length... |
Problem Statement: I have an ACCE project created by another user with some library files attached. Is there a way to export those library files to my library without having to create a copy manually. | Solution: In ACCE there is an option to export attached spec library files to your library. This helps in easily transferring library files without having to share it separately. Right mouse click on the respective Spec in the Project Basis View and select Export to Library as shown in the attached screenshot. Enter th... |
Problem Statement: What solver settings may be modified to improve a slow running dynamic simulation? | Solution: See the attached word document with a few comments and advices on how to select solver settings to improve dynamic simulation reSolution performance. We will include those comments in the on-line help documentation of Aspen Custom Modeler future versions (planned for v11).
Keywords: dynamic, solver, settings
... |
Problem Statement: What are the lower and upper bounds for variables in Aspen Adsorption and how can these be changed? | Solution: If we open the AllVariables table for any block in the flowsheet, we can see the default lower and upper bounds for the variables.These can be changed if required.
Sometimes these lower and upper bound may not be displayed in this table and in that case if we right click on the Headings field and select pr... |
Problem Statement: I would like to extract the physical properties from the Cooler Performance Tables in HYSYS to a spreadsheet in Excel using VBA. Depending on the process stream sometime heavy liquid is present other time only light liquid is present in the cooler. Is there any way I can define a general code to extr... | Solution: Since V8.8 the hysys.tlb was updated to include curve parameter accessors on the cooler, heater, and other interfaces.
With these V8.8 interfaces you can directly access the CurveMixedLiq{PROPERTY}, CurveHeavyLiq{PROPERTY}, and CurveLightLiq{PROPERTY} RealFlexVariables to find the values.
Each RealFlexVari... |
Problem Statement: What should I do when my Hydrate formation line stops at the Cricondenbar? | Solution: To workaround this limitation of Envelope Analysis, you can utilize the Hydrate Formation Analysis tool along with Case Studies. The idea is to generate a case study of Hydrate Formation temperature against pressure. This article will focus on accessing these tools from the Navigation Pane. Other ways of acce... |
Problem Statement: How do I define the default values for both the Grid Spacing and Grid Index for my drawings? | Solution: The settings for both the Grid Spacing and Grid Index of the ABE Drawing Editor are found in the registry. By default, these values are set to 1 mm and 5 for the Grid Spacing and the Grid Index, respectively.
Users may set new values according to their needs in the registry, applying these changes at once ... |
Problem Statement: What is the difference between vessel pressure and vessel pressure-dynamic variables accessible for vessels inside a spreadsheet? | Solution: If we select the vessel pressure-dynamic, then when we switch to dynamic mode and if the vessel pressure is checked in the dynamic specification then the pressure that we set in the spreadsheet will be used. But, quite often in dynamic mode the vessel pressure is determined by the surrounding unit operations ... |
Problem Statement: What is the difference between the two similar methods NRTL and NRTL-2 in Aspen Plus? | Solution: The NRTL property method uses:
The NRTL activity coefficient model for the liquid phase.
The ideal gas equation of state for the vapor phase.
The Rackett model for liquid molar volume.
Henry's law for supercritical components.
The NRTL-2 property method uses:
The NRTL activity coefficient model for the liquid... |
Problem Statement: I want to populate UFD symbol library. I ca not do this because the system does not see any new folder I have created.
I create the folder “Valves” in the UFD symbology but I don’t see it in the drawing manager.
How do I include a new folder in t... | Solution: Drawing Editor application has a drawing editor template file (XML) that describes the mapping between the logical symbol folders and folders that are shown on the Symbol Library on the application. When adding a new folder inside Symbol folder, you need to update as well the xml files located in the Template... |
Problem Statement: When will either the ‘Convert to Template’ or ‘Template Properties’ options be shown under the Customize | Case section? | Solution: Users may find either the ‘Convert to Template’ option under the Customize | Case section on the ribbon or the ‘Template Properties’ option, depending on the type of simulation file opened in Aspen HYSYS.
The ‘Convert to Template’ will show up only if the simulation file is an Aspen HYSYS case, that is, a fil... |
Problem Statement: How is pressure drop across a RadFrac tray calculated in simple dynamic tray correlation? | Solution: If we specify simple tray correlations, the pressure drop across a tray is related to the volumetric flow of vapor into the tray and the liquid on the tray using the following equation.
Where:
ΔP = Pressure drop across the tray
KO = Orifice constant
ρV = Vapor molar density
ρL = Liquid molar density
QV = Vo... |
Problem Statement: What are the limitations of modeling polymer process in Aspen Plus Dynamics? | Solution: Followings are the common limitations encountered modeling polymer process in Aspen Plus Dynamics:
Only one polymer product can be handled.
Only one Ziegler Natta catalyst is allowed, however the catalyst can be single or multi-site.
No emulsion polymerization kinetics is allowed.
Most reaction models are clo... |
Problem Statement: Can I calculate the energy required for a mixture to change state from saturated liquid to a specified vapor fraction (i.e. a pseudo Heat of Vaporization)? | Solution: By definition, the Latent Heat of Vaporization of a mixture in HYSYS is the enthalpy difference between the bubble point (Vf=0) and the dewpoint (Vf=1) at a fixed pressure.
If you wish to calculate a pseudo Heat of Vapourization (i.e. energy required) for a mixture to change state from the saturated liquid (... |
Problem Statement: Saving a snapshot to a folder works without a problem but when a share location is used in place of the actual folder path, the following error can occur: can not access this file. | Solution: Add the user name to the Share Permissions to allow the user access to the share. For manual snapshot saves the logged on user must have share permissions set. For scheduled snapshot saves, the InfoPlus.21 System Account must have share permissions set.
Note: When reviewing the share properties, there is a S... |
Problem Statement: In Exchanger Design & Rating, a calculated pressure drop is reported in TEMA sheet for both shell side and tube side. However, within the Overall Summary, if you sum up the reported pressure drop contributions from different sources, the result is not equal to TEMA sheet value. Why is that? | Solution: The Overall summary is only reporting pressure drop associated with frictional effects (such as nozzles or bundle Xflow). Nevertheless, there is also pressure drop associated with gravitational changes, as well as to acceleration effects (momentum changes due to condensation throughout the heat exchanger).
T... |
Problem Statement: How can predictions be improved using DMC3 Builder? | Solution: One of the techniques to improve predictions is to analyse the masked/unmasked response curves.
Note: For illustration purposes, we are going to use a Crude Distillation Unit (CDU) as an example, since it is a very well-known process.
The following figure has a bunch of response prediction curves for some CVs... |
Problem Statement: How to change the display sequence/order of components of a Product in Aspen Petroleum Scheduler?
Requirement is that it should display in the same sequence as the one when the component is added.
The screen-shot below shows the desired configuration:
Go to Model à Products
Select any product and add... | Solution: This refers the setting of display order of components of a Product in APS
APS is working as designed by sorting components in any product according to the value in the SEQ field of the COMPONENTS table in the model Database. When a component is added there is a default value for SEQ that is assigned to the c... |
Problem Statement: What is the pressure drop correlation used in the BLOWDOWN utility? Why it’s not used in the pipe segment unit operation? | Solution: For two-phase flow in pipe model in BLOWDOWN, the Friedel correlation is used to determine the pressure drop and liquid hold-up. You could find more details of the Friedel correlation in HYSYS Help menu under Blowdown Technology - Technical reference” – “Piping Pressure Drop and Liquid Holdup Equations”.
T... |
Problem Statement: How do I view the Sulfur Recovery performance results in Aspen HYSYS-Sulsim? | Solution: The following steps apply only after the simulation has been run and converged successfully.
First, return to the main flowsheet by clicking on the Flowsheet/Modify tab in the top ribbon and then selecting the Go to Parent button.
Locate the Sulsim sub-flowsheet icon.
Then, double-click on the Sulsim icon ... |
Problem Statement: Why Aspen Shell and Tube program does not allow to enter the number of tubes? | Solution: The program allows you to enter the number of tubes according to the tube rows and maximum number of tubes per row per pass.
For example, if you enter 8 rows and 4 tube passes, the calculated maximum number of tubes per row per pass is estimated as 19. This means that will need to enter 152 tubes per bundle.
... |
Problem Statement: How can double wall plate heat exchangers be modelled in Aspen Plate Exchanger? | Solution: Double wall plate exchangers are used in industry to eliminate the risk of fluid leakage from one stream to another within the heat exchanger, as any potential leak will be to the external of the unit. This can be for safety and/or product purity considerations.
This configuration is relatively rare and curr... |
Problem Statement: How do I change the scale of a drawing? | Solution: The scale of drawing can be changed by selecting the Scale icon from the Modify tool bar.
If the Modify tool bar is not active by default, you can activate it from View | Toolbars... | modify.
Keywords: scale factor, drawing, enlarge, reference
References: None |
Problem Statement: Is it possible to add Non-Newtonian fluids in Exchanger Design & Rating? | Solution: Newtonian fluids have the relation between local shear stress and shear rate (gradient, transverse to the flow direction, of the local velocity) which defines the viscosity:
For a power law Non-Newtonian fluid, the relation is:
This means that effective viscosity is a function of shear rate:
Where:
K Consi... |
Problem Statement: Can I access PFR results via Automation? | Solution: Currently the PFR object (PFReactor in the HYSYS type library) does not have properties for all the results that are available in the interface. However, these properties can be accessed via Backdoor variables. In this method the internal monikers (pointers to the information) are used to access the variables... |
Problem Statement: How do I input a condensation/vaporization curve in Aspen Shell & Tube Exchanger? | Solution: Select 'User specified properties using heat loads' option; with this option the cumulative heat load is used to determine the duty of the stream. A reference mass flowrate for the specified heat load is entered, where the entered heat load is divided by the reference flowrate to determine the change in speci... |
Problem Statement: Can a user specify different duties for each coil in a Fired Heater in Aspen HYSYS to meet design specifications? | Solution: In Aspen HYSYS, a fired heater model always distributes the duty almost equally. The simple fired heater model HYSYS in steady state. It distributes the heat evenly among the radiant zone streams (and ignoring the convective/economizer zone streams). That is to say, the change in heat flow from inlet to outle... |
Problem Statement: Equations and Benchmark calculations of relief loads for emergency scenario | Solution: The attached document provides a hand made validation for the calculated relief loads inside the Safety Analysis Environment. The emergency scenarios included are:
1. Control Valve Failure
a. Vapor Equations
b. Vapor Example with Unchoked Flow
c. Vapor Example with Chocked Flow
d. Liquid Equ... |
Problem Statement: I have a HYSYS model of a column with internals. When I try to export the column to KG-TOWER, the sections do not have the correct trays.
For example, in the figure above, section CS-1 starts from stage 10 and ends at stage 1. However, when exporting to KG-Tower, section CS-1 was from stage 26 to s... | Solution: The default choice for column stage numbering in HYSYS is Top down. If you choose the Bottom up option for stage numbering, then the sections will not have the correct tray numbering when you try to export to KG. You need to change the stage numbering back to Top down under Design tab - Connections.
After ch... |
Problem Statement: This an an example on how to get ODM (BPC) data from the s95 web service into aspen SQLplus.
The example below will retrieve the name and description of a ODM equipment object.
Note: Please note that Microsoft SOAP client is 32-bit only, in order to run on a 64-bit Infoplus.21 you'll need to use the ... | Solution: To run this example first copy and paste the code into the aspen SQLplus query writer. Second replace the nodename becks2 with the node name of your ODM webservice and the equipment name Edmonds with an equipment name that exists in your database.
LOCAL obj_soap,
wsdl_file CHAR(160),
varArra... |
Problem Statement: How can I activate/deactivate a Design Spec from ASW? | Solution: To activate/deactivate Design Specs from ASW please make sure the Aspen Plus simulation and ASW are already connected. After that, please follow the next steps:
1. In Aspen Plus, go to Flowsheet Options | Design Specs and select the Design Spec(s) you want to connect to ASW
2. Right-click on it and copy it:
... |
Problem Statement: Example of a user KLL Distribution Coefficients (USRKLL) subroutine for an Extract block | Solution: Attached is an example of using a USRKLL subroutine for an Extract block. A Fortran compiler is needed to compile and run this example. The backup file will run in V7.3 and higher.
This routine is an illustration of an Aspen Plus user-defined KLL routine for the Extract unit operation block. The liquid-liqui... |
Problem Statement: How do I model control valve hysteresis? | Solution: Currently there is no valve hysteresis feature for control valve. However, it is possible to set up hysteresis for a valve in Dynamics using some auxiliary blocks and a bit of data manipulation.
Ideally, you would want to be able to define separate characteristics curves for Cv depending on the direction of ... |
Problem Statement: Relief Valve Sizing in Aspen HYSYS: Benchmark with Examples | Solution: In the attached document, the couple of hand calculations are provided to benchmark the vapor, steam and liquid calculations for HYSYS PSV according to API 520. Using the downloaded demo file and this walkthrough, the user will learn how to properly use relief valve sizing in Aspen HYSYS v8.3 to design, size,... |
Problem Statement: Where can I find the thermodynamic model GERG2008 for an LNG model? | Solution: GERG2008 is not a fluid package available in the Aspen HYSYS library.
You can find GERG2008 by selecting Aspen Properties in Aspen HYSYS and selecting Property Package Filter as All.
Keywords: GERG2008, fluid package, Aspen HYSYS library
References: None |
Problem Statement: The Watchdog Countdown is a very useful parameter for an APC application. On DMC3 builder setting this parameter is different from the way it is set on DMCplus and this could lead into confusion. This tech tip attempt to clarify how to find and set this parameter. | Solution: 1.- On the Calculations tab from the controller three, select User entry and then General, by scrolling down the Built-in entries the Watchdog Countdown parameter can be found. However, the parameter cannot be modified from this view. TheSolution to this is by selecting the Deployment tab from the controller... |
Problem Statement: How do I resolve error C:\Program Files (x86)\ApenTech\Aspen Simulation Workbook VX.X\ASWXLAddinLoader.dll is not a valid Office Add-in? | Solution: First, you need to verify the version of Office that is being used. ASW V10 and prior are not compatible with Office 64-bit, only with 32-bit. V10.1 has implemented compatibility with Office 64-bit
If the version of Office is 32-bit, you need to follow these steps to solve this issue:
1. Run Aspen Excel Add... |
Problem Statement: Why do I see Incompatible Fluid Package error message when using Oil and Gas Feed? | Solution: When you are using the Oil & Gas Feed for a material stream, sometimes you may see a warning message: Incompatible Fluid Package.
It’s because you do not have any hypo components in the associated components list. Oil & Gas Feed is used define stream composition as a mixture of oil and gas. You could define ... |
Problem Statement: What can be set up through ‘Template Properties’? | Solution: The Template Properties feature (Customize | Template Properties) is active only for template files (RefSys reactors, compressor surge, columns, etc.) and allows users to have more control over template variables.
Installed Simulation Basis allows users to change the Fluid Package basis to either internal or... |
Problem Statement: PCWS allows to customize the Operations and Engineering View for the DMCplus controllers and other APC applications. This | Solution: is a quick guide to show how the views can be customize from the Web Page.
Solution
1.- On the webpage go to the configuration Tab
2.- In the left hand option Refer to Column Sets. This option would enable to see a list of all APC applications. Then select DMCplus.
3.- In the Top ribbon you will see two op... |
Problem Statement: Are Stagnation Energy and Energy Flow the same? | Solution: Stagnation Energy and Energy Flow are defined as follows:
Stagnation Energy = Enthalpy * Flow
Energy Flow = Stagnation Energy + Kinetic Energy
So, with the definitions above, it is easy to realize that Stagnation Energy and Energy Flow will have the same value if the Kinetic Energy term is disabled, so Kinet... |
Problem Statement: How do I model a heat exchanger with a minimum or maximum fluid velocity through the tube side? | Solution: There can be cases where a minimum or maximum fluid velocity specification has to be fulfilled in a heat exchanger to avoid future issues. For example, a minimum velocity to reduce fouling, or maximum velocity to minimize erosion.
When running a Design case in Exchanger Design & Rating, it is possible to spe... |
Problem Statement: Run-time error ' 521' Can't open Clipboard. This error message is normally seen when using DMCplus SmartAudit or Uncertainty Analysis. The upcoming windows either don't open or the program is closed immediately. Typically, it occurs a lot when using DMCplus applications from a remote session. | Solution: Solution#34088 and #9949 explain 2 methods to solve this issue.
If it's not resolved, we could find rdpclip.exe process in Windows Task Manager, and End process (Kill the process). After the process is killed, SmartAudit and Uncertainty Analysis is supposed to be good to open.
Rdpclip.exe is the main execu... |
Problem Statement: How do I set up a Case Study in Aspen Plus? | Solution: In order to create a Case Study in Aspen Plus, first create a Sensitivity Analysis. From the Simulation Environment Navigation Pane, expand the Model Analysis Tools Folder and then select the Sensitivity Folder. Then click New and enter an ID.
In this example, we will research a simple heat exchanger where... |
Problem Statement: How to model more than 10 convection banks in Aspen Fired Heater? | Solution: In Aspen Fired Heater (from the Exchanger Design & Rating, EDR, suite), it is only possible to model a maximum of 10 convection banks per model when you work with the EDR interface standalone.
However, it is possible to use the Activated feature to integrate EDR with Aspen HYSYS and connect two (or more) dif... |
Problem Statement: What deviations from the original literature source are present in the Aspen HYSYS implementation of MBWR? | Solution: The Aspen HYSYS Modified Benedict-Webb-Rubin (MBWR) equation of state is implemented based on NIST’s program from 1992.
MBWR uses Wilke's method for the calculation of the viscosity of mixtures and NIST’s formula for that of a pure component in the vapor phase. While, in comparison with the Benedict-Webb-Rub... |
Problem Statement: I am getting Unable to start solver calculation: No calculable sources. What does it mean? | Solution: The message Unable to start solver calculation: No calculable sources is due to the following possible reasons.
Firstly, user should check the sources mass flowrate. User may have all sources with zero mass flow. In order for the program to run, user should set the mass flow of at least one source to non-zer... |
Problem Statement: How does Aspen HYSYS calculate Cp and Cv? | Solution: How does Aspen HYSYS calculates Cp?
Cp is calculated rigorously from the molar enthalpy - temperature relationship. How enthalpy is calculated depends on the thermodynamic model being used. (See the Aspen HYSYS Help guide for a full description.)
How does Aspen HYSYS calculates Cv?
CV is calculated by Aspen H... |
Problem Statement: Visual studio 2010 crashes when loading from AtBasicPlots.ocx | Solution: There is a problem with DEP (Data Execution Prevention) on Windows 7 when using a 3rd party VSFlex7L.ocx grid control used by AspenTech Legend control (AtLegend.ocx). It only seems to occur when the control is used in custom applications, or from certain web pages.
This issue can be resolved by turning DEP... |
Problem Statement: How can a flowsheet be optimizated using sequential modular mode? | Solution: Attached is an example of a user kinetic subroutine for an RCSTR.
This file will run in V7.3 and higher.
The simulation includes two RCSTR reactors. One uses the standard Power Law expression. The other uses a User kinetic routine of the Power Law expression. A Fortran compiler is needed to compile and run th... |
Problem Statement: How do I set up a Case Study in Aspen Plus? | Solution: In this example, we will research a simple heat exchanger where a liquid stream is being heated. Our goal is to observe the effect on the outlet temperature (dependent variable) based on varying the following three manipulated (independent) variables:
1) Process stream flow rate
2) Process stream inlet te... |
Problem Statement: How do I find iso-hexane, iso-heptane, and iso-octane components in HYSYS databank? | Solution: Components can be found searching by Full Name/Synonym
· Iso-hexane as 2-MethylPentane or as 2-MC5. You can compare the CAS number of this component for iso-hexane: 107-83-5.
· Iso-heptane as 2-MethylHexane or 2-MC6. CAS number: 591-76-4.
· Iso-octane as 2,2,4-TrimethylPentane or... |
Problem Statement: How do I adjust the Equipment Setting Labor for an entire project? | Solution: In order to change the Equipment Setting Labor Hours for the entire project:
Go to the Project Basis View tab
Find Indexing (under the Basis for Capital Costs folder)
Right Click Indexing -> Click on Select
Click Default -> Then Click OK
Right Click Indexing again -> Click Edit
Click Man Hour -> Click Mo... |
Problem Statement: How do I change the password for the broker service that uses a local system account? | Solution: This account is created during install, and if the password has been updated, please make sure to change the password in the following three places.
Administrative Tool Services
Navigate through Control Panel | Administrative Tools| Services
Right click on AZ191Broker and select Properties. Note that for V10 ... |
Problem Statement: How to customize External Fittings file in ACCE? | Solution: Users can use the external Fittings file to create customized rules. These rules apply only to BPIPE components (in V10.1 - they can be applied to Installation Bulk Pipe). The instructions for how to use the file are included in the file itself. To access the external file:
RMB on the Fittings External F... |
Problem Statement: Severe error in Aspen Plus columns without a condenser: “A liquid feed/pumparound to the top stage is required” | Solution: When you set up a column block without a condenser, as in the picture below, a liquid feed stream in stage 1 or a pumparound to the same stage is a required input for the model.
If you connect the top stage of the column to a tear stream from a recycle or to a pumparound defined using a side stream, you may g... |
Problem Statement: How are methods and rules arranged in the Select Method and Select Rule dialog boxes opened from Explorer? | Solution: The methods and rules are arranged alphabetically by the name of the Visual Basic routine and not by the Module Name or Display Name.
To demonstrate this functionality, create the following local methods:
If the list were arranged alphabetically by either the Module Name or the Display Name, the list woul... |
Problem Statement: What considerations should be made when modelling flexible pipes / hoses in the pipe segment block in Aspen HYSYS? | Solution: With regards to flexible pipes (in steady state), these can be thought about as pipes with many bends. As the name suggests, the geometry of these pipes are not fixed, so the general advice would be to make a conservative estimate for the number of bends in such a system. As such, it is possible to overestima... |
Problem Statement: What is the meaning of the 3 different curves for the temperature profile in crossflow plate fin exchanger | Solution: In crossflow plate fin exchangers, three lines are shown for each stream, corresponding to its temperature along the exchanger centerline and on the left- and right-hand sides.
For axial flow streams, the three lines each represent a flow path. For crossflow streams, the lines are transverse to the flow path... |
Problem Statement: How can I map a Class View to different Classes? | Solution: It is possible to map a Class View to different Classes through separate Composite Views.
To do so, follow the next steps:
1) Right-click on the Class Views folder and insert a new Class View. Name it and click on ‘OK’.
2) Now right-click on the Composite Views folder and insert two Composite Views. For ea... |
Problem Statement: What is the criteria for ACCE to select motor type for Pump? | Solution: If you specify (or the system calculates) a driver power greater than 300 HP (224 KW) with a motor type, a Totally Enclosed Water Cooled (TEWAC) motor will be generated. In APEA and ACCE, the additional piping lines for cooling water and an additional temperature control loop are generated.
In case 1 below si... |
Problem Statement: How do users generate a new component list with a different boiling point temperature range if they already have had an old component list? | Solution: If users want to generate the new component list with a different boiling point temperature range, please follow the steps below.
1. Import a new component list from the system pak (C:\Program Files (x86)\AspenTech\Aspen HYSYS VX.X (Software Version)\Paks). It includes many different Hypos for different temp... |
Problem Statement: How to move records from one folder to another folder using Aspen SQLplus | Solution: SET EXPAND_REPEAT=1;
FOR SELECT record_name AS moveit FROM sourcefolder WHERE record_name LIKE 'xxx' DO
INSERT INTO destinationfolder(record_name) VALUES (moveit);
DELETE FROM sourcefolder WHERE record_name LIKE moveit;
END;
Query notes: ·
The SET EXPAND_REPEAT=1 command expands the folder repeat area to cre... |
Problem Statement: Does AspenTech support Aspen InfoPlus.21 in a 'Cluster' environment? | Solution: In V8.5 Aspentech introduced Aspen MES Clustering which is aSolution to minimize downtime and promote higher availability of supported servers in Aspen’s MES product family, specifically its process information server Aspen InfoPlus.21 and Aspen Production Record Manager. TheSolution is based on proven, widel... |
Problem Statement: Is it possible to predict foaming in an Aspen HYSYS Column? | Solution: Aspen HYSYS does not have the capability to predict foaming in a column.
Starting with V9.0, the Column Analysis feature was included in the software. This feature allows the user to use the foaming factor as a user input.
This factor will affect the liquid height and it is used just to calculate pressure d... |
Problem Statement: No indirect costs Calculated Despite User-Specified Indirects as a Percentage of Direct costs, in the Indirects and Proratables Form | Solution: Users have a few options for providing projects indirect costs. One way to do this is by entering indirect costs in the Indirects and Proratables form (Basis for Capital Cost/Customer External Files/Indirects - Proratables). For example, to calculate material taxes as a percentage of direct material costs, ... |
Problem Statement: The AspenTech Calculator Engine service is not required for Aspen Calc clients. | Solution: The AspenTech Calculator Engine service, which executes scheduled calculations, is now optional.
A Service sub-feature of the Aspen Calc product in the AMS installation controls whether the service is installed. This sub-feature is selected by default for Server installs and not selected by default for Standa... |
Problem Statement: What is the difference between the two Auto Section options for Column Internals Analysis? | Solution: Using Column Internals Auto Section in Aspen HYSYS and Aspen Plus users can automatically creates column sections based on feed and draw locations or internal flow rates.
When Auto Section | Based on Feed/Draw Locations is selected, the program uses the following logic to auto section the column:
1. HYSYS/Plu... |
Problem Statement: How can a flowsheet be optimizated using sequential modular mode? | Solution: Attached is an example of a user kinetic subroutine for an RCSTR.
This file will run in V7.3 and higher.
The simulation includes two RCSTR reactors. One uses the standard Power Law expression. The other uses a User kinetic routine of the Power Law expression. A Fortran compiler is needed to compile and run th... |
Problem Statement: How can I modify the inlet piping non-recoverable pressure drop limit percentage? | Solution: Every time that users come across a situation in which the inlet piping non-recoverable pressure drop exceeds the specified percentage value of the set pressure for a pressure relief valve (which is set to 3% by default), a warning message related to the inlet piping non-recoverable pressure drop will appear.... |
Problem Statement: How to create a Trend using the Data Trending function. | Solution: 1. From the main menu tab click to open the Capital Cost icon. (highlighted in the image below)
2. Select the Interactive Reports report type
3.Open the Trend options.
If starting a new Trend, select Clear All Saved Trends menu option. A confirmation dialog box will appear, Click Yes to confirm clearing of ... |
Problem Statement: How to resolve the problem that ASW is not updating when a variable is changed in Aspen Plus? | Solution: A user has to follow several steps to synchronize the ASW and the Aspen Plus:
When a table was created via the Organizer at the ASW, the user has to close the Aspen Plus software. Only Microsoft Excel is kept working.
To change variables at the Aspen Plus the user has to click Visible to open the Aspen Plus... |
Problem Statement: aspenONE Process Explorer allows manual data entry to the Aspen InfoPlus.21 database for authorized users. It can be enabled in the Add/Remove Legend Columns dialog by toggling the option for Manual Entry from OFF to ON. However, after changing the value for a tag and pressing Submit, the following m... | Solution: · Open Internet Information Services (IIS) Manager and click the expansion button next to the nodename
· Select Application Pools
· Right-click Aspen Security Pool and select Advanced Settings option from the Context menu
· Scroll down to Identity under Process Model and click ... |
Problem Statement: What is a Snapshot Manager in Aspen HYSYS Dynamics? | Solution: During dynamics modeling, the Snapshot Manager can be used to create a snapshot of the simulation. Select Take a Snapshot to create a snapshot file that contains the state of the simulation at that instance of time when the integrator is still running. The snapshot files saved as a .hsp file allow users to tr... |
Problem Statement: Is there a way to copy source data from one scenario to another in Aspen Flare System Analyzer? | Solution: To copy source data from one scenario to another in Aspen Flare System Analyzer, you can use the 'Copy To' option.
Following steps will give provide more details.
1. Open the source editor (Control Valve or Relief Valve) and select the 'Copy To' button on the bottom of the window.
2. Select the Scenario to... |
Problem Statement: What is the unit for liquid holdup in a pipe? | Solution: Liquid holdup in a pipe is defined as the ratio of the volume occupied by liquid in a segment to the total volume of the segment, at a given point in the pipe. It is thus a fraction which varies from 0 (for all gas flow) to 1 (for all liquid flow).
Keywords: Liquid holdup, pipe
References: None |
Problem Statement: What is the difference between HTFS and TEMA vibration analysis? | Solution: Exchanger Design & Rating performs vibration analysis for Shell & Tube exchangers. There are two options available, HTFS and TEMA methods.
HTFS vibration model is more elaborated than TEMA method. The latter basically considers 5 major tube spans having a fixed vibration boundary condition with no simultaneo... |
Problem Statement: How is the fluidiation height (the transport Disengagement Height) modeled in the fluid bed? | Solution: The fluidized bed model is divided into different vertical zones. At the bottom there is the dense fluidized bed also called the bottom zone, above which the freeboard or upper dilute zone is located.
The transient region in between is denoted as the splash zone, where rising bubbles from the bottom bed explo... |
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