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Problem Statement: How to save MBO model | Solution: s by matrix row and column to databaseSolution
To list MBO optimization results in database by matrix row and column, please select “SaveSolution to Database” in Multi-Period Blend Optimization dialog box. After optimization, MBO will outputSolution values in Table LPSOL in database, with row/column names, MI... |
Problem Statement: Model keeps running when it is supposed to stop. How do I troubleshoot? | Solution: The end of cycle may be defined by a criteria that is never met. In the Cycle Organizer under Step | Control, the end of a step is specified as either time or event driven. If the end of the step is event driven, ensure that the event actually occurs. Create a plot of the variable of interest to check if it r... |
Problem Statement: How to convert an APS/MBO database from ACCESS to SQL Server? | Solution: There are two major steps required:
1. Create an APS/MBO SQL database structure using the script provided by AspenTech.
2. Use the DBCopy utility provided by AspenTech to copy the database from ACCESS to SQL server.
Create an APS/MBO SQL database structure
1. Create a new APS (or MBO) SQL Database, for ... |
Problem Statement: What does the perforation percentage field in the LNG exchanger in Aspen HYSYS represent? | Solution: The perforation percentage is the percentage of perforation with respect to the total fin area. Hence, it cannot be 100%. In Aspen Exchanger Design and Rating, it is called porosity.
For perforated fins, Aspen Exchanger Design and Rating gives a rule of thumb value of 5%. This only applies to perforated fins... |
Problem Statement: This article explains what is 'Engineer Request' entry in PCWS control page. | Solution: Each variable in an Aspen APC controller has the concept of 'In Service' or 'Out of Service', it allows the variable to be turned OFF for the controller, but not at the DCS level.
'Engineer Request'is the service switch for an variable. It permits engineers to assign any of the following modes that determine... |
Problem Statement: How do I open a CAP_REP.CCP file if I do not have ACCE running? | Solution: You can open a ccp report either with Notepad or with the Economic Evaluation Report Editor.
The Economic Evaluation Report Editor application is launched through ICEdit32.exe, located in this directory:
C:\Program Files (x86)\AspenTech\Economic Evaluation <version>\Program\Sys.
Keywords: ccp report, Econom... |
Problem Statement: Why do I see a very poor separation performance than I expect when I model a real separator, even though all the carry-over specifications and/or correlations have been set correctly and the separator has solved? | Solution: Users may want to check the product nozzle locations and diameter.
If a product nozzle with certain diameter is located so that the interface of two phases is being covered by the nozzle, then there will always be two phases of the flow going through this nozzle, no matter which product phase this nozzle was ... |
Problem Statement: How to avoid “non-square” flowsheet scenario for dual-fuel boiler optimization case? | Solution: Dual fuel boiler model has access to two different fuel sources simultaneously. Between two fuels, one fuel flow should be fixed while other should remain free. In order to have flowsheet updated correctly after optimization run, parameter “BalanceFuel” must be selected to the fuel source that is selected as ... |
Problem Statement: What are the units for isotherm parameters? In the chromatography column specification table, the parameters seem to be unitless. | Solution: In the chromatography column specification table, you may see the unit of isotherm parameters is n/a.
However, these isotherm parameters do have units. They depend on the units of other variables like component loading and concentration. For example, if you are using Langmuir isotherm:
The base unit of wi (... |
Problem Statement: How do I enable GMULT for Aspen DMC3 controllers? | Solution: The procedure is as below:
1, open Aspen DMC3 Builder, locate your DMC3 controller project
2, find Model Parameters in Master Model tab in left Controller panel
3, check the 'Enable gain multiplier', select the MV/CV pairs which you are going to enable GMULT.
4, click OK to accept the changes
After the entr... |
Problem Statement: How do I model a flare system using Aspen HYSYS Dynamics? | Solution: You can represent the flare system in Aspen HYSYS Dynamics as a combination of valve and pipe segment for multiple phase flow, but it will not consider the kinetic energy term in the temperature and pressure calculation. The calculation without including kinetic energy term results in a higher velocity and he... |
Problem Statement: What is the range of valid values for the output | Solution: in a PIMS-AO run?
Solution
During a PIMS-AO run the user may designate a number for the naming of the OutputSolution file created as shown below. Acceptable values for this are 1 to 65534.
If a value higher than 65534 is entered, then the run will fail with the messages shown below in the execution log.
Th... |
Problem Statement: Why does the specified fittings and valves count change in a plant bulk pipe component after changing the Pipe Routing Type? | Solution: This is a designed behavior in Aspen Capital Cost Estimator (ACCE) that allows the user to apply quick fitting count adjustment to all the piping associated to a specific type (e.g. Pipes in racks, AGR).
As soon as the user selects a Pipe Routing Type, ACCE will immediately search and apply the information i... |
Problem Statement: This article describes about the procedure to scan selective tags in AspenOne process explorer Admin tool.
It is no more required to scan the entire database, even when only few tags are added to database. | Solution: When new tags are added in the Aspen InfoPlus21 database, it is mandatory to scan the new tags.
This is required for making the new tags appear in the AspenOne process explorer search engine.
As such, the entire database can be scanned through AspenOne process explorer Admin tool.
The steps below, however, a... |
Problem Statement: How to change Oracle client’s language setting on the APS machine for EIU to work ?
EIU doesn’t work for ORACLE when NLS_LANG setting is different with OS language.
Background:
1．NLS_LANG setting of Oracle
NLS_LANG is set in the registry on Windows platforms.
The NLS_LANG parameter has three compone... | Solution: TheSolution for the issue is to change Oracle client’s language setting on the APS machine.
The following are the steps to change the client's language setting for an APS machine:
Open Registry on your machine which installed both APS and Oracle client.
Edit the following registry entry:
For Oracle version 7... |
Problem Statement: In AFR V10, is there any option to easily assign multiple events from the Unit Diagram to existing events in the RAM data? | Solution: Starting in V10 CP3, we have the Event Assignment feature which allows user to assign multiple events from the Unit Diagram to existing events in the RAM data. The Event Assignment button on the Home ribbon | Customization group is only available when an event or events in a unit diagram are selected. Clickin... |
Problem Statement: The Dynamics Assistant indicates a message saying Tray section dry hole pressure drop too large, what does that mean? | Solution: The vapor Pressure/Flow relation through the column is calculated using a valve-like P/F relation using a K factor for each and every tray:
Where:
Fvap = vapor flowrate leaving tray N
k = conductance, which is a constant representing the reciprocal of resistance to flow. (For columns the conductance, k, is ... |
Problem Statement: For the Reflux Ratio Spec, what does the Include Vapour checkbox mean ? | Solution: For a Condenser with the following products
V = Vapour product
D = Distillate product
R = Liquid Reflux to column
If Include Vapour is checked then
Reflux Ratio = R / (V + D)
If it isn't
Reflux Ratio = R / D
Hence if the Condenser has no vapour product (ie a Total Condenser) then it doesn't matter if this che... |
Problem Statement: How do I change the materials of the Air Supply items in Aspen Capital Cost Estimator? | Solution: The air supply materials generated on a piping component are by default added into the estimation considering galvanized steel (GALV) for the fittings and pipes, and naval brass (BRASS) for the valves included.
This default configuration cannot be changed or controlled from the regular ACCE interface.
If you ... |
Problem Statement: Does the valve account for sonic flow/ choking in Dynamics? | Solution: The valve does model choking. However, you must use the Cv option and not the k option (Simple resistance equation).
If you add a pipe segment in the valve, then note that the pipe segment contribution does NOT model choking.
Keywords: Cv, k, Choking, Sonic
References: None |
Problem Statement: What can prevent me from running Activated Economics in Aspen Plus? | Solution: When the Aspen Plus simulation presents any Error, the Activated economics features will not be available.
It is important for Activated Economics to be able to read all the simulation data from all the blocks in order to correctly Map and Size all of them and correctly estimate them. When errors are present ... |
Problem Statement: How to import simulation data from Aspen Plus in English (ENG/IP) units into Aspen Process Economic Analyzer? | Solution: There are several ways of importing Simulation information from Aspen Plus into Aspen Process Economic Analyzer (APEA), such as clicking “Send to APEA” from the Aspen Plus interface or selecting a simulation file from the Project basis section of an APEA file.
However, these two options transfer information ... |
Problem Statement: For Steam Header “FixImbalanceFlow” variable, which option to select? | Solution: The “FixImbalanceFlow” variable lets user select either “True” or “False” option. If True is selected, user must specify the steam/water imbalance flowrate. If False is selected, then the flow imbalance is calculated as Free variable based on the feeds to and demands from the steam header.
Please note that w... |
Problem Statement: In Aspen HYSYS, the Cold Properties utility includes several methods to estimate the Reid Vapor Pressure, what is the difference of each one of them? | Solution: First, to access to the Cold Properties, the user can select the Analysis section of the Attachments Tab from a Stream and click on create.
On the following window, the user can select Options button and display the several methods to estimate Reid Vapor Pressure.
This list includes the following correlations... |
Problem Statement: When I send data from Aspen Flare System Analyzer to MS Excel by clicking the Excel button on the Results forms, arithmetical formulas cannot be used in Excel | Solution: When you transfer information from Aspen Flare System Analyzer using the Excel button, the application will simply perform a Copy/Paste operation from the Flare interface to MS Excel.
This however, causes the values transferred to Excel to be considered as Text, rather than as numbers that can be used in ari... |
Problem Statement: Does AFR validation feature only represent the state at Time Zero? | Solution: Although, default validation represents the state at zero, it is not the only state that it can represent. For example, an event can be activated or de-activated. A tank’s currently level can be modified. So, in short, it is a single point in time, but you are allowed to setup the current state of the model f... |
Problem Statement: This | Solution: describes how to populate a csv file with work orders for import by Aspen Mtell when using the MIMOSA CRIS DB open standard choice of EAM adapters.Solution
First, generate a blank csv import template. This can be done with the following steps: 1) Open the Aspen Mtell Agent Builder, 2) Click on the “Failure Li... |
Problem Statement: Every time you launch an AspenTech program, the splash screen is shown with the product name, product version and the product family. Some programs also display the status of the program startup at the bottom of the splash screen.
It is recommended that the splash screen should be displayed for all u... | Solution: To disable the splash screen, open a Command Prompt with the Run as Administrator option.
Navigate to the AspenTech Shared folder by typing: cd C:\Program Files (x86)\Common Files\AspenTech Shared and press Enter.
Type the command: AspenSplash.exe -unregserver and press Enter.
To re-enable the splash screen... |
Problem Statement: Why are the pH stream results not shown in Aspen Plus even if I have acids and hydroxides on my component list? | Solution: When you add pH results to the results summary of Aspen Plus, it’s important to mention that pH results are only calculated and reported for the liquid phase of a stream, so you may have to expand the Liquid Phase results to see this data. For the case of streams that are full vapor, pH will not be calculated... |
Problem Statement: Why reverse flow in heater model causing dynamic run fail? | Solution: Heater model supports reverse flow. However most of the times, the heat transfer options in heaters are selected as “Constant Duty” which may cause thermal convergence in reverse flow situations. In forward flow mode, if flow rate goes down then constant duty option drives the temperature of process fluid to ... |
Problem Statement: Aspen Connect fails to connect to the Azure IoT Hub. As a result, publishing of data to Azure IoT Hub using OPCUA on the IOT Hub configuration returns the error- “Microsoft Azure did not accept the IoT Hub Connection Request” | Solution: 1. Using Windows Explorer, navigate to the folder “C:\ProgramData\AspenTech\CertificateStores\RejectedCertificates\certs”
Note: Folder location C:\ProgramData\ might be different between computers. You can get the correct ProgramData location on a computer by opening a command prompt (DOS) and running the... |
Problem Statement: In a control valve, when I select Manufacturer specific methods under Rating tab | Sizing page C1 factor is available. What is this factor and how do I establish its appropriate number? | Solution: C1 is defined as the ratio of the gas sizing coefficient and the liquid sizing coefficient (Cg/Cv) and provides a numerical indicator of the valve’s recovery capabilities.
To maintain a steady flow of liquid through the valve, the velocity must be greatest at the vena contracta, where cross sectional area is ... |
Problem Statement: How do I enable Time Constant and Variable Deadtime for Aspen DMC3 controllers? | Solution: The procedure is as below:
1, open Aspen DMC3 Builder, locate your DMC3 controller project
2, find Model Parameters in Master Model tab in left Controller panel
3, in the new dialog, we can see Gain Multiplier, Time Constant Multiplier and Variable Deadtime. Once enabled, these options allow APC engineers mak... |
Problem Statement: How are critical properties calculated for a stream? | Solution: There are two sets of critical properties reported for a stream in Critical Property Analysis: Pseudo and True critical properties.
The Pseudo critical properties are simply the summation of the apparent contributions of each pure component. For example, the pseudo Tc of a binary mixture (component 1 and 2) w... |
Problem Statement: How to create Ad-hoc Calculations in A1PE? | Solution: AspenONE Process Explorer can display the results of an Ad-hoc calculation as a pen on the trend plot
Benefit – no need to create extra tags inside the Aspen InfoPlus.21 database to hold results
* Ad-hoc – a Latin phrase meaning “for this purpose only”.
To create an Ad-hoc calculation, type your calculation... |
Problem Statement: How can I access the phase specific information of a stream such as transport properties (viscosity, thermal conductivity, etc.) via OLE? | Solution: To access a phase, you must first obtain a Fluid object for the stream. This can be accomplished by using the .DuplicateFluid() method of the ProcessStream object.
Accessing properties of the phase can actually be accomplished in a single line. Here is an example of code which will start from the ProcessStrea... |
Problem Statement: How can I attach a stream to more than one operation? | Solution: By default, HYSYS does not allow a stream to be connected to more than one operation (this is particularly important to avoid potential difficulties caused by material balance problems).
However it can be set to allow this:
Go to the File menu | Options | Simulation | General Options and check the Allow multi... |
Problem Statement: How to account for changes in pH rather that ion gradient in Ion Exchange Chromatography? | Solution: Aspen Chromatography does not do rigorous chemical equilibrium calculations. You can use a custom isotherm and as part of the custom isotherm call the pTrueComp procedure to get the equilibrium composition and calculate PH from there. Note, this requires configuring Aspen Properties and converting from equiva... |
Problem Statement: Results are inconsistent when running the same simulation multiple times. How to fix the problem? | Solution: A common cause is that the variables were not initialized to the same set of values before each run. This can occur in these situations:
It can occur if the simulation was not rewound after a previous dynamic run. Rewind each time.
Alternatively, if the simulation is saved and closed at time > 0, the values a... |
Problem Statement: Which of the AFR parameters are used for validation only? | Solution: In Aspen Fidelis Reliability, parameters can either be used in both simulation run and model validation or are limited to either simulation run or model validation. The table below displays all elements and categorizes each element parameters as simulation only, validation only, or both for reference. All par... |
Problem Statement: How to activate Aspen Utilities Planner Microsoft Excel Add-in? | Solution: Please follow the following steps to activate the Utilities Planner Add-in in Excel:
1. Please open an Excel blank file and go to File > Options
2. Select Add-Ins > Manage: Excel > Add-Ins > Go
3. And select the Utilities 360.xla file from the following location:
This will complete the activation of Aspen ... |
Problem Statement: How to model coating for an Air Cooled Heat Exchanger in EDR? | Solution: For Air Cooled Heat Exchangers that operate near the coast, corrosion due to sea water is a common problem. In such cases, coating is applied to the external surface of the ACHE as protection to prevent such issues.
In EDR, there isn’t a specific input to add coating. However, if we consider that this coating... |
Problem Statement: Internal streams for Distillation Column have different information than external streams | Solution: There can be two different scenarios where an internal stream inside the Column Environment can display different results for process data and stream properties than those reported in the external stream:
When exporting an Internal Stream created by taking the top stage vapor phase: it is expected that its te... |
Problem Statement: How do I remove the fittings and valves added automatically by the Pipe Routing Type? | Solution: As mentioned in article 47037, when the user selects a Pipe Routing Type, ACCE will look for information in the Fittings file.
If the user wants to eliminate this additional fittings and valves, the Fittings file must be modified.
In the Project Basis View, locate the Fittings form under the folder Customer... |
Problem Statement: “PD-# VOLTAGE SPECIFIED IS LESS THAN MINIMIM”
What does this error mean and how can I resolve it? | Solution: This error can appear when the user manually specifies the Supply Voltage on one of the Main Substations or in the main Transmission line (Primary Voltage spec) under the Project Basis | Power Distribution tree form.
Aspen Capital Cost Estimator (ACCE) always evaluates the required power for the project b... |
Problem Statement: What is Ramp rate and how it is used in Aspen DMC plus/DMC3 controller application? | Solution: Ramp rate is the dynamic tuning parameter for Aspen APC (DMCplus/DMC3) controller application, which is the forcing function that drives the ramp variable back towards the operator-entered RAMPSP, from current value.
Ramp Rate application for APC controller
Ramp rate and ramp set point are used to calculate ... |
Problem Statement: Is it possible to run Aspen Flare System Analyzer through Excel Automation? | Solution: As with many other AspenTech programs, Aspen Flare System Analyzer (AFSA) is indeed compatible with VBA in Excel and can be used to generate customized interfaces.
However, one key difference when comparing AFSA with other applications such as Aspen HYSYS is that the Flare interface is not visible from VBA.
I... |
Problem Statement: How can I set different Fluid Packages for my Sub-Flowsheets? | Solution: In the Home tab, you should be able to see, on the Simulation section, the Fluid Packages button. When you click on it a list of all flowsheets involved in the simulation will appear. Pick the desired flowsheet and use the drop-down menu to select a Fluid Package.
By default, all Flowsheets share the same ... |
Problem Statement: What does the following warning mean and how can I solve it?
“End stage not specified for CS - # in Main Tower of column T - # # #!” | Solution: This message simply indicates that the information for column internals is currently incomplete. Specifically, this means that the “End Stage” for a specific Internals Section was left incomplete, the message also points towards the Column name (T - 301 in this example) and the Internals Section of this unit ... |
Problem Statement: I am getting the error message: Html Report Failed! Item has already been added
How do I resolve this issue? | Solution: This message can happen when there is a configuration issue or corruption of the results.mdb file. Deleting the results.mdb file will usually resolve the issue.
Keywords: None
References: None |
Problem Statement: This | Solution: outlines the procedure for configuring Aspen Mtell to automatically import data from csv files instead of with a live connection to a historian. This implementation methodology is generally used if the historian is far beyond a firewall or if there is a desire to limit the load on the historian.Solution
A “CS... |
Problem Statement: Can we add persisting breakpoints in VSTA debugging? | Solution: Starting from V10 CP5 you can now add persisting breakpoints. It means that breakpoints placed during the debugging process now persist after closing the VSTA IDE.
Key words
breakpoint, debugging
Keywords: None
References: None |
Problem Statement: In the legacy Titan version, there was an easy way to create multiple scenarios and compare them. Is there a similar feature in V10? | Solution: Although we don't have the option to create multiple scenarios we have added a case comparison feature starting in V10 CP3. The File Inputs Comparison window allows you to compare the inputs of two model files. This allows you to easily determine the differences and unique occurrences between model files with... |
Problem Statement: In this example, you will evaluate if the current trayed column configuration is hydraulically adequate for base case operation. You will then evaluate the hydraulic and process benefits of installing Raschig packing for the next turnaround. Finally, the increased V-L contacting provided by the new p... | Solution: Use the tuned HYSYS Acid Gas Cleaning model to:
1. See if the existing column is hydraulically limiting
2. Evaluate the effect of installing Raschig packing at the next turnaround on product quality
3. If sales gas quality is predicted to improved, determine if you can reduce the require... |
Problem Statement: What standard is used by EDR to calculate the shell-to-bundle clearance? | Solution: EDR uses TEMA standards for this purpose. TEMA starts with shell to baffle OD clearance (See Table RCB-4,3), then considers enough to be able to build the bundle and remove the bundle when removable. Typical fabricator clearances tube-OD-to-shell-ID is 1/2 on diameter (1/4 on radius) for fixed tubesheet units... |
Problem Statement: Is it possible to model Electrolyte Chemistry and Pseudocomponents? How are binary parameters generated? | Solution: The NRTL and UNIQUAC binary parameters for water and pseudocomponents are intended for use in LLE calculations, as water and hydrocarbons tend to form two liquid phases. These interaction parameters are estimated from the mutual solubility data. The solubility of water is estimated from one of the methods des... |
Problem Statement: In the simulation import process of an Aspen Plus file, stream properties of hierarchy blocks are not transferred to Aspen Basic Engineering (ABE). What do I do to transfer this information? | Solution: As explained inSolution Aspen Zyqad Property Set for Aspen Plus, certain stream data may not be transferred to ABE because the necessary properties/property set has not been set up in Aspen Plus.
Setting up a property set should transfer the information to Aspen Basic Engineering, but when we have hierarchy b... |
Problem Statement: How to create a dump file using the Microsoft feature ProcDump ? | Solution: ProcDump is a command line tool for collecting dumps that is freely available from Microsoft. Applications can either be launched with ProcDump (very useful if the application is crashing on startup), or attached to with ProcDump.
Additionally ProcDump can immediately collect a dump in the case of attaching ... |
Problem Statement: How to connect Aspen Cloud Connect to Aspen InfoPlus21? | Solution: Aspen Cloud Connect can connect to Aspen InfoPlus21 using the Aspen InfoPlus21 OPC UA server, or the Aspen InfoPlus21 OPC DA server. Here are configuration details for making the connections.
Aspen InfoPlus21 OPC UA server connection:
Setup the certificate trusts following KB “How to configure a UA certific... |
Problem Statement: What do the different messages in the message panel mean? | Solution: Starting V10 CP3, the Message Panel now shows relevant information, warnings, and errors associated with the model to help you solve any issues you may come across while working with Aspen Fidelis Reliability. The Message Panel can be accessed by navigating to the View ribbon | Show group | Message Panel in t... |
Problem Statement: This knowledge base article documents the SYNTAX used for OPC UA tag addresses. | Solution: The OPC UA tag name syntax is defined by a OPC UA server in accordance with OPC Foundation standards. Refer to the vendor’s OPC UA server documentation for a description of the valid tag name syntax for that server.
Here is an example of an OPC UA tag name syntax used to retrieve a value from the Aspentech I... |
Problem Statement: How to add the VBA code reference in Excel to Microsoft Visual Basic for Applications Extensibility 5.3?
The screen-shot below shows the current Excel configuration: | Solution: The VBA Extensibililty library contains the definitions of the objects that make up the VBProject. In the VBA editor, go the the Tools menu and choose
Keywords: VBA,
References: s.
In that dialog, scroll down to and check the entry for Microsoft Visual Basic For Applications Extensibility 5.3. If you do not s... |
Problem Statement: How can I change the temperature of the viscosity displayed in the Cold Properties Analysis? | Solution: The viscosity of a stream in the Cold Properties Analysis is reported at two different temperatures 100F (37.8C) and 210F (98.9C).
These temperatures in the Cold Properties Analysis are hard coded and cannot be modified. As a workaround, you can copy the stream, change the temperature to whatever you want a... |
Problem Statement: Why Heat Recovery Steam Generator (HRSG) operational status may change after Optimization run? | Solution: When the flowsheet is run in simulation mode, the user can select either “ShutDown” or “InService” option for the operation status of HRSG.
During regular simulation run this is not changed. However, during flowsheet Optimization run, if the optimization solver finds zero flow through this equipment can fulf... |
Problem Statement: How to configure Aspen cloud connect to publish data to an OSISoft PI Historian. | Solution: Requirements:
PI Web API Version 2015 R3
Access to OSISoft PI System Explorer Application
Permissions to Edit PI-AF database
PI User Account with Permissions to Create Tags and to Write Data to Tags
Access to the Aspen Connect Toolkit
Step 1: Access the PI Web API configuration
First access the PI AF Server ... |
Problem Statement: How can I copy a parameter from one stream to another such that it updates automatically? | Solution: This can be easily accomplished using a Set operation.
If for example you wanted to copy the temperature from stream 1 to stream 2, you would set the Target variable to be Stream 2, temperature and the source object to be stream 1.
To copy the value exactly set the multiplier to be 1 and the offset to be 0, ... |
Problem Statement: Why is my RPLUG reactor calculating a conversion higher that 1.0 and how can I avoid it? | Solution: Depending on the conditions and the kinetics of a reaction in an RPLUG model, in some occasions a very high conversion can be calculated by Aspen Plus.
When these high conversions (near 100%) are expected, it is possible that due to the convergence algorithm of the RPLUG block, the user can find a molar flow ... |
Problem Statement: How to open and link Aspen Utilities Planner file from Excel Add-In? | Solution: Please follow the steps below to link Aspen Utilities Planner with Excel Add-in:
Open the Aspen Utilities planner file first.
From the Aspen Utilities Add-In menu, select Open Aspen Utilities
3. Point to the model location and select Open.
4. When prompted with the following question, press Canc... |
Problem Statement: Connection stream type is very commonly used to connect blocks in an Aspen Custom Modeler flowsheet. This stream type does not have any variables and it simply links variables between the ports that it is attached to. This is shown by the < and > signs before the variable name in the stream table, wh... | Solution: To access these stream variables within a script there are two options:
The simplest option will be to use the port variable from the block directly, i.e.:
BlockName.PortName.VariableName.value = number
Another option is to find out where the stream is connected and refer to it. This is useful if, for some r... |
Problem Statement: WARN> 'PIP- #' NO DEFAULT COMPONENT INSULATION AVAILABLE, PLEASE PROVIDE COMPLETE SPECIFICATIONS
What does this warning mean and how does it affect my results in Aspen In-Plant Cost Estimator? | Solution: The warning above can show up in Aspen In-Plant Cost Estimator when the user loads a Custom Pipe Specs file into the estimation project and then adds piping items with no Insulation Thickness specified.
This warning simply indicates that there is no insulation thickness specified for the specific piping i... |
Problem Statement: How do I report the compressibility factor (Z) for the vapor in a specific tray in a distillation column? | Solution: Some property data, such as transfer properties, temperature and pressure in each column stage, can be reported in Aspen HYSYS under the Performance | Plots section of the Column window.
However, not all the stream properties can be reported on this summary, such is the case of Z factor. The values of these p... |
Problem Statement: The simulations that I build are generally complex with multiple Events/Units. Is there a way to find an element without having to navigate through the entire flowsheet? | Solution: Starting with V10 CP3, the Find Element window allows you to easily find any element by name in the flow diagram or unit diagram without searching in the simulation environment. The major benefit of the Find Element window is the ability to locate the unit diagram where events reside. The Find Element window ... |
Problem Statement: What are the distillation curve types supported in HYSYS Petroleum Assay? | Solution: In Aspen HYSYS, th user can manually enter petroleum data to define a Petroleum Assay and its properties. By default, when the user creates a new Petroleum Assay, Aspen HYSYS will provide the option to enter TBP data.
If the user wishes instead to enter a different type of distillation data, select the Singl... |
Problem Statement: Fugacity - Can I access it for my stream? | Solution: No, even though this property is computed in the flash calculation, the HYSYS internal structures do not cache this information. Therefore, the fugacities for a stream or individual phases are not user-accessible in HYSYS, unfortunately.
Keywords: Fugacity, Properties.
References: None |
Problem Statement: How to ramp the controller set point over a fixed duration of time in Aspen Plus Dynamics | Solution: You cannot directly ramp SP value because SP is a state variable. You can only step change the value of SP. If you want to ramp the controller set point, first set the controller to Cascade mode, and then ramp the remote set point (SPRemote) from a form or a task.
(1). If you want to ramp from a form, right ... |
Problem Statement: How do I simulate a vent line attached to a depressuring vessel? | Solution: The Depressuring Utility does not allow the addition of unit operations. However, if you need to simulate a vent line, a dynamic simulation can be built in order to accomplish this. Figure 1 shows a flowsheet that can be implemented in Aspen HYSYS Dynamics in order to simulate a depressuring system with a ven... |
Problem Statement: The error “CIMIO_DAL_GETDEVICE_NOSERVICE” may appear in the CimIO_MSG.log if the interface startup is not able to get the logical device name for the scanner, store and forward processes | Solution: The message can be resolved by creating a logical device entry for the interface in the CimIO_Logical_Devices.Def file.
Run the CimIO_T_API.exe
Select option 2 Test Adding a Logical Device
Follow the prompts to enter the details of the interface device
Restart the interface
Keywords: No service
Cim_io
Referen... |
Problem Statement: Is it possible to connect Aspen Custom Modeler (ACM) and Python? | Solution: Calling Python from ACM: ACM supports Procedures which are auto-generated fortran or C wrappers that the solver can call directly. If the user compiles his/her Python with Cython, it will generate C code that can be called from a C procedure in ACM. For numerical stability, it is recommended that users return... |
Problem Statement: How can I adjust the mole fraction of a component in a stream? | Solution: Sometimes it is desired to either have the freedom to adjust a component mole fraction using an Adjust or in a Case Study. It is not possible to do this directly from the stream, but there is a way to accomplish this using a pure component stream and a mixer.
Create a stream with the composition specified to ... |
Problem Statement: How are hypothetical components generated by the Oil Manager named? | Solution: Hypothetical components generated by the Oil Characterisation function in HYSYS are named as follows:
NBP[x]y
(E.g. NBP[0]28)
x is just a marker to indicate which oil blend the hypo belongs to. For example if in the Oil Characterisation Environment you set up two blends then the hypos belonging to the first b... |
Problem Statement: Heat Transfer Fluids and Refrigerants. What do the names mean? | Solution: Attached is an Excel spreadsheet with the following:
A list of the Refrigerants and their full names, including the composition of the refrigerant (where known).
A list of the heat transfer fluids with their HYSYS abbreviation, full name, manufacturer and some public domain information about their compositio... |
Problem Statement: How can I copy stream information and have the second stream update every time the first stream flashes? | Solution: Use a Balance to pass along the molar flow rate, composition, and the enthalpy/heat flow (set the balance type to Mole and Heat). Add a Set operation to specify the pressure. The stream will now have enough information to force a flash.
Other option is the use of the Virtual Stream operation. Add it and conn... |
Problem Statement: What is the Hydraulic Plot? How do we view and interpret the plot in Aspen HYSYS Column Internals? | Solution: The Hydraulic Plot is used for studying the tray/packing hydraulics of the column sections in Aspen HYSYS. It is a vapor vs liquid (mass) flow rates plot showing the stable operation region.
The Hydraulic Plots form is divided into these main sections: The column diagram appears on the upper left. Below it,... |
Problem Statement: What does Auto Calculation check box do in the Equilibrium Plots operation? | Solution: Its purpose is to have the plot automatically update itself when an input changes (e.g. temperature, pressure, and component).
When the Auto Calculations check box is unchecked, changing an input causes the plot to clear and Plot must be pressed to re-draw the plot. With Auto Calculations on, the plot updates... |
Problem Statement: What is the break point between small bore vs large bore in the ACCE Excel Above Ground Piping Analysis report? | Solution: The ACCE Excel report AG (above ground) Piping Analysis includes a summary displaying the characteristics of the piping added to the project, such as average diameter, number of welds, total length, etc.
In this report, some information is divided in large bore and small bore to better represent the data. The... |
Problem Statement: I would like to run a schedule and to be able to start or stop a sequence that exists in another schedule. Is this possible? | Solution: In Aspen HYSYS Dynamics, the ‘Event Scheduler’ allows users to set up both customized and complicated scenarios to perform given tasks at predetermined times once a simulation is running in dynamic mode.
The Event Scheduler window contains all the ‘Event Schedules’. Each ‘Schedule’ is comprised of ‘Sequences... |
Problem Statement: Are all scenarios available in the PSV Safety Analysis able to calculate the Relieving Flow? | Solution: No, this feature is only applicable for some scenarios (see below):
· Fire
· Control Valve Failure
· Exchange Tube Rupture
· Fan Failure
· Reflux Failure
· Thermal Expanison
For these scenarios, a specific relief load calculation is prescribed by Aspen HYSYS and ... |
Problem Statement: How to view results of the sulfur recovery process using Sulsim in Aspen HYSYS? | Solution: The Performance Summary form is used to view the results of the sulfur recovery process.
User can access the Performance Summary form:
From the Sulfur Recovery Results ribbon tab, click the Performance Summary button.
Or from the Sulfur Recovery Unit Sub-Flowsheet, click the Performance tab
After the Sulf... |
Problem Statement: APC online and AspenWatch servers may encounter problems if the system locale is set to any other than English (United States) | Solution: Since there is no localization done for the APC online and AspenWatch software, the system may encounter problems when the system locale settings for such server is set to anything else other than English (United States).
To avoid run time errors, it is recommended to set the system locale for APC online and ... |
Problem Statement: How are the Cavett Heat of Vap Coefficients used in the enthalpy calculations? | Solution: On the Point tab page of component view in the Properties Environment, there are two coefficients called Cavett Heat of Vap Coeff A and B.
How HYSYS uses these parameters depends on which property package you are using. For equations of state (EOS) models, like PR and SRK, it is not used at all. With EOS pack... |
Problem Statement: How do I make the best use of the Aspen HYSYS Dynamic Depressuring Utility? | Solution: Connections Page
Enter the vessel dimensions such as Height, Diameter and Head Areas. These parameters are relevant for the heat transfer calculations or the heat load and wetted surface area calculations. Note that for Horizontal vessels the Height is the length of the vessel.
Note that Aspen HYSYS does not ... |
Problem Statement: Does Aspen Chromatography predict isotherms for any solute/solvent/adsorbent systems? How could I determine the isotherm model parameters? | Solution: Aspen Chromatography cannot automatically predict the isotherms for your system. You will need to pick the right isotherm for your system based on your engineering judgement. Make sure the isotherm model is appropriate for the process you are investigating. The equilibrium specified by the isotherm model affe... |
Problem Statement: How to simulate urea in aqueous | Solution: ? I always get an error message saying Calculation stopped because property parameters are missing.
Solution
1. Add your components in the component list, then use Elec Wizard to generate real components and reactions in the electrolyte system.
2. Click Next. Deselect Salt formation and tick Water dissociati... |
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: How is the catalyst heat capacity taken into account in the energy balance of the dynamic Plug Flow Reactor? | Solution: When a catalyst is available in the plug flow reactor, there are three options for the thermal inertia of the catalyst to be incorporated into the dynamic reactor.
1. No heat transfer (default) and no additional input is required. In this case there is no catalyst present, or the effect of heat transfer betw... |
Problem Statement: I ran my RadFrac column with Column Internals set up to consider my model as a packed section for a rating run. The flowrates in the column are very low. However, the ‘Error in packing section calculations’ message is read under Results. What can be the root cause of this error? | Solution: For some RadFrac columns that have the Column Internals - Rating feature set up to consider the column as a packed column to carry out hydraulic calculations, if the flowrates in the column are too low and the column diameter entered as input by the user turns out to be too large for such small flowrates, the... |
Problem Statement: Why HYSYS Peng-Robinson property package from “HYSYS” and “Aspen Properties” package types generate different simulation result? | Solution: In Aspen HYSYS, when adding fluid packages, you can choose from “HYSYS” (which is the default option) or “Aspen Properties”.
“Aspen Properties” has more fluid packages for choice compared to “HYSYS”, but both package types contain the most widely used packages like Peng-Robinson:
However, if you are usin... |
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