question stringlengths 19 6.88k | answer stringlengths 38 33.3k |
|---|---|
Problem Statement: How does the “Prevent XLP Solve if Table Load has Errors” option work? | Solution: In PIMS-AO, any table errors detected by PIMS are highlighted when the model is openned and tables are read. These warnings are not repeated when the model is run. Therefore, it is possible that users run without fixing data entry errors such as #REF, #NA in the Excel tables.
Under Model Settings | NonLine... |
Problem Statement: How to set an On-Off controller? | Solution: This can be done adding three digital control point operations and one Boolean latch gate operation.
Open the attached HYSYS case OnOff_starter.hsc.
We would like to control the level of V-100 (height = 1.127 m) through valve VLV-101. If the level is above the maximum level (0.80 m) the desired actuator posit... |
Problem Statement: The Depressuring tool does not initialise or begin calculations. Why is this? | Solution: Such an issue is normally a result of inadequate input values. If the values in Depressuring Utility window look complete (even if not necessarily correct), the program should still attempt to calculate. If this does not occur, navigate to the Dynamics tab, Integrator options:
These options (used in Dynamic ... |
Problem Statement: How do I know what the minimum required inputs are to calculate a cost for a project component? | Solution: First, open the component in question and view its main form. For many components, but not all, you will notice cells that are bordered in red, yellow, and green.
Cells with a red border are required.
The user has the option to enter data for either the yellow cell(s) or the green cells. However, enterin... |
Problem Statement: What are the different Aspen Properties fluid packages for modelling water-only fluids? | Solution: When modelling pure water systems, it is more accurate to use one of the following models (vs. a general Equation of State model, e.g. Peng Robinson):
STEAM-TA: ASME 1967 steam table correlations
STEAM-NBS: 1984 NBS Steam Table
STEAMNBS2: 1984 NBS Steam Table. The same equations as STEAMNBS, but with diff... |
Problem Statement: How does the convective dryer perform the energy balance? | Solution: Heat balance for the gas phase
Here MG is the mass flow-rate of the gas in the dryer, cp,G the specific heat capacity of the dry gas, TG the temperature of the gas, Q the heat flow-rate, NP the total number of particles, z the axial coordinate, L the total length of the dryer, and Q.ind,G the rate of heat tr... |
Problem Statement: How is contingency applied in Aspen Capital Cost Estimator? | Solution: The contingency percentage input for a project will not match the final percentage shown on the report. The reason for this difference is explained in the steps below. Please see the attached files.
1) To input a contingency percentage to be applied to the overall project, first go to the Project Basis Vi... |
Problem Statement: Comparing a single phase fluid flowing in a vertical (upward) pipe vs. a horizontal pipe (of similar geometry), I notice that the frictional pressure drop (in the Pipe Segment) is different. Why is this? | Solution: In the vertical pipe with the upward rising (single phase) fluid, there is a pressure loss due to the elevation change, i.e a reduction in static head. This change in pressure is affecting the Reynolds number (through a reduction in the density and viscosity). The friction factor is a function of the Reynolds... |
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: What are the different Cp/Cv methods in Aspen HYSYS? | Solution: There are different Cp/Cv values calculated by Aspen HYSYS using different methods:
1. Cp/Cv - This is calculated rigorously based on actual temperature and pressure in the stream. Aspen HYSYS uses this rigorous method for compressor performance & relief valve sizing calculations.
2. Cp/(Cp-R) - T... |
Problem Statement: I would like to change the class of an object already placed on my workspace, and maintain the data of the object. How do I achieve this? | Solution: If you want to change the class of an object, you need to use a KB or query.
Attached is a KB method example.
1. From the Rules Editor, load the attached azkbs file.
2. Replace the Agitator text with the new class.
3. Compile and install the KB
4. From ABE Explorer execute the method on each object to modi... |
Problem Statement: How to modify the Binary Interaction Parameters for a number of binary pairs such as H2O-N2, H2O-CO2, H2O-H2S? | Solution: For a number of binary pairs (such as H2O-N2, H2O-CO2, H2O-H2S), HYSYS Peng Robinson (PR) property method does not allow to modify the Binary Interaction Parameters (BIP). HYSYS PR uses T-dependent kij to improve accuracy. These T-dependent kij's are hard-coded and are used automatically. Any user-entered ki... |
Problem Statement: What are the equations used for determining the simple packed column hydraulics in Aspen Plus Dynamics? | Solution: The simple packing hydraulics equation relates the liquid flow rate from a packed section to the amount of liquid in the section as follows:
Where:
IfV =Liquid volume fraction in the packed section
uL= Liquid velocity in the packed section
This is calculated from the volumetric flow rate of liquid and the t... |
Problem Statement: What does the petroleum property correlation ‘Penetration’ measure? | Solution: Starting with V9.0, Aspen HYSYS reports ‘Penetration’. This property correlation is based on the standard test for hardness of wax by ASTM D1321, which measures the depth in tenths of a millimeter that a needle of certain configuration under a given weight penetrates the surface of a wax at a given temperatur... |
Problem Statement: How to change the sequence of parameters/instrument type names displayed in the start and end conditions of an Instrument in AtOMS that need to be rearranged?
Requirement is that it should display in the following sequence: level, temperature, density and so on.
The screen-shot below shows the curr... | Solution: This refers the setting of display order of AtOMS Instruments” in the AtOMS Client.
The sequence of parameters can be changed by renaming the Instrument type names in AtOMS Admin tool
Open the AtOMS Admin tool
Go to “Instruments_Type” List in the Model Tree.
Rename the LEVEL Instrument with “1_LEVEL”
Rename t... |
Problem Statement: What is the difference between Sensitivity and Nested Case Study Types? | Solution: The difference between the two Case Study Types is the way the variables are examined and the total number of states.
In a Sensitivity case study, each variable is examined at a time. For example, Variable A changes independently from the other variables. Once the analysis of Variable A is complete, Variable... |
Problem Statement: What impact does Base Time Unit Offset have on scheduled calcs? | Solution: The calculations will execute at the execution times in the schedule group. When the offset is added, it adjusts the execution time of the schedule group.
Each group has a calculated base time unit of seconds, minutes, hours or days. Groups by default are scheduled to be executed at the top of the base time... |
Problem Statement: On the Face Plate of a controller, what does SP:R or L and Exec: Int or Ext mean? | Solution: When a face plate for a controller is selected, user can view the Process Variable (PV), Operating Point (OP), Set Point (SP- Inverted red triangle) and the mode of the controller.
It also displays the two internal setpoints in the controller SP: L (Local) or R (Remote).
The local setpoint (L... |
Problem Statement: Suppose the Excel add ins for APS i.e. EIU & Refinery Report Wizard are no longer available in the excel workbook.
On trying to add these Add ins again from the Excel Utilities folder, it gives the below error: | Solution: This Excel ADD in is used for Aspen Petroleum Scheduler and gets installed as a part of the standard installation of the product.This add-in is being used in the application for invoking functionalities provided by APS like EIU & Aspen Refinery Report Wizard.
The issue mentioned in the problem statement can ... |
Problem Statement: Can I perform Column Internals analysis for Side Operations like Side Rectifiers, Side Strippers? | Solution: Yes, the Column Internals analysis can be performed for Side Operations like Side Rectifiers, Side Strippers.
Once the side operations are added and the column is converged. You can select the desired side operation and perform internals analysis.
To view the results, click on View Internals Summary on the I... |
Problem Statement: What is the Purpose of “Running Gauge Comp Tanks” option in Blend Optimization Dialog Box in APS ? | Solution: Running Gauge Comp Tanks feature is used to account additional VOLUME of Components generated [or] VOLUME of Component being received during the Blend operation and that VOLUME will be accounted for Blend Optimization process.
In Detail,
Consider a situation, where REF1 ( REFORMATE ) coming from Unit and s... |
Problem Statement: How to specify the time line, multiple tags, etc when calling pbplots.asp from custom application? | Solution: How to specify time line: End time and time span can be specified using the T2 and TimeSpanMilliSeconds query parameters, respectively. T2 is an integer specifying UTC date time in ms from January 1, 1970, e.g., T2=1457165114000 for 05.Mar.16 08:05:14 (UTC). See http://www.unixtimestamp.com/index.php <http... |
Problem Statement: How do I change the High Time (maximum time on the X-axis) on a Strip Chart in Aspen HYSYS? | Solution: The high time of the strip chart cannot be changed initially before the case has been run. The software will not allow this value to be modified if there is no data in the graph.
After running the simulation, the graph will progressively begin to fill in as data is generated. After completing the run, it i... |
Problem Statement: I want to convert my HYSYS file to xml. file. However, there is no choice for xml. file when trying to save it. I need the xml. file to convert a file from the new version of Aspen HYSYS into an older version. What could I do? | Solution: When you use Petroleum Assays in HYSYS simulation, you could not save the hsc. file to xml. file. If you go to “File” – “Save As”, you will not find the choice of xml. file when trying to save it:
In some cases, there is a workaround. Try to manually input “.xml” after the file name and save it (just neglect... |
Problem Statement: How to resolve Permission Denied error being received while operator/user is trying to activate a movement in AtOMS? | Solution: This error shown in the problem statement screenshot is for a user log in configured for ATOMS.
Please find the cause for this issue and the reSolution for fixing this problem,
Cause: DCOM settings not being configured for the user’s login resulting in an error while activating the movement.
It is essential ... |
Problem Statement: How to model a rupture disk in Aspen Flare System Analyzer | Solution: In Aspen Flare System Analyzer (AFSA), rupture disks may be modeled with control valves or pressure relief valves.
Both types of source have a user specified flowrate and do the same rigorous energy balance. A maximum allowable backpressure must be specified, but it can be either entered by the user or calcul... |
Problem Statement: What are the differences between the two Beggs & Brill methods 1973 and 1979 for pipe segment correlations? | Solution: The differences between the two Beggs & Brill methods are:
Beggs & Brill (1973):
Includes Flowmap correction by Payne et al.[1977]
Does not Include Frictional Pressure drop correction for rough pipes by Payne et al.[1979]
Does not include Liquid Holdup Correction for uphill & downhill pipes by Payne et al.[... |
Problem Statement: How do I control the data transferred between Aspen Capital Cost Estimator and Aspen Basic Engineering? | Solution: Options for import can be accessed directly from the Cost Mapper window by clicking on Tools | Options, to control the data imported and specify whether input values are overwritten.
Keywords: Zyqad, costing data, Icarus import, Cost Estimator Interface
References: None |
Problem Statement: How does EDR Mechanical determine the Hydrostatic Test Pressure? | Solution: To calculate Hydrostatic Test Pressure. Exchanger Design & Rating uses code rules UG-99(B), which dictate that vessels designed for internal pressure must be subjected to a Hydrostatic Test Pressure. This value will be equal to 1.3 times the Design Pressure multiplied by the Lowest Stress Ratio (LSR):
Hydro... |
Problem Statement: What are the advantages of using New Equation Oriented (EO) Subflowheet and Modeling capabilities in Aspen HYSYS V10? | Solution: Aspen HYSYS V10 features a new, revolutionized Equation Oriented Sub-Flowsheet. Equation Oriented Solving is an alternative method used for solving flowsheets in HYSYS, which normally uses Sequential Modeling. EO technology collects the model equations and derivatives for selected operations in the flowsheet ... |
Problem Statement: When trying to configure a CIM-IO Interface, the user might get the following message-
Creating Cim-IO for OPC SERVERNAME...
Failed create SERVERNAME
CIMIO_MGMT_PROCESS_EXECUTABLE_INEXISTANT, Process executable does not exist
Please check if Aspen CIM-IO Manager service is running | Solution: 1. Check if the Aspen CIM-IO Manager service is running.
2. If the service is running and the problem persists. This is typically because different executable interfaces are not found on the Cimio directory.
All different interfaces need to be in the following folder.
C:\Program Files (x86)\AspenTech... |
Problem Statement: How do I create a brand new blank APS database in SQL? | Solution: After setting up an SQL instance, open SQL Management Studio and create a new blank database. (This is done from the SQL interface)
Right click against the instance name and select New Database
Name the database that is being created.
Next, go to the application install folder (Default location: C:\Program... |
Problem Statement: Why is pressure increasing instead of decreasing in my pipe segment when a swage fitting is added? | Solution: When a swage is added as a fitting in a pipe segment to model and account for the diameter change between to pipes of different sizes (diameters), there will be a pressure increase instead of a decrease.
The reason why pressure increases in the pipe is due to the diameter increase across the swage between ... |
Problem Statement: How to model a vacuum pump in Aspen HYSYS | Solution: Pump calculations are performed by Aspen HYSYS with the assumption that the liquid going trough is incompressible; that is, density is constant (liquid volume is independent of pressure). This is the usual assumption for liquids well removed from the critical point.
In summary, to model vacuum pumps in Aspen ... |
Problem Statement: How are Pseudo and True Critical Properties of material streams calculated in Aspen HYSYS? | Solution: (1) The Pseudo Critical Properties of material streams calculated by the Critical Properties Utility, are calculated by a linear mixing rule.
For example:
Where:
is the composition (mole basis) of component ‘i’
is the critical temperature of component ‘i’
Therefore, the pseudo critical properties of... |
Problem Statement: Are there velocity values recommended for a Plate exchanger as there are for a S&T exchanger? | Solution: Fluid velocity in a heat exchanger is an important variable to keep track of in order to control pressure drop or effects of fouling, erosion, etc. Unlike tubular exchangers such as Shell & Tube or Air Cooled exchangers, Plate heat exchangers are compact equipment. The velocities for the port and plate channe... |
Problem Statement: How do I add a component if it is not available in Aspen HYSYS? | Solution: On the navigation pane of the Properties environment, select a component list. The Component List property view appears.
In the Component List property view, select Hypothetical in the Select field.
Click the New Hypo Group. The Hypo Group property view appears.
Open the Hypothetical Manager and click the S... |
Problem Statement: How to change the fluid package for a single or multiple trays in a column? | Solution: A column can use different fluid packages for different stages, including the condenser and the reboiler. The Parameters tab | Fluid Pkgs page property view lets you change the fluid package for each stage. Use the Change Fluid Pkgs button to change the fluid packages for a range of stages in one click.
Not... |
Problem Statement: I want to perform a Vapor-Liquid-Liquid separation, then I need to use a Flash3 block instead of the Decanter, since I want to take into account the vapor separation. However, I would like to consider that a part of L1 is entrained in the L2 and viceversa. This is possible when using a Decanter block... | Solution: In order to take into account the entrainment of the 2nd Liquid in the 1st one and viceversa, one can use a sequence of Splitter and Mixer blocks, as shown in the image below:
- the splitter SP1 allows to separate a fraction of the 1st liquid from the B1 Flash3 block and mix it with the 2nd Liquid stream thro... |
Problem Statement: Failure library does not list an equipment set recently added in the machine learning tab even after running machine learning training over the equipment. | Solution: Changes made to the database on the Machine Learning section are saved into the Mtell database, and can be accessed from the Failure Library section. However, the display for each section does not automatically refresh when user makes changes to the database from another section. To get the Failure Library to... |
Problem Statement: What are the different dynamic initialization modes for a vessel in Aspen HYSYS? | Solution: Using the different initialization modes, you can determine the composition and amount of each phase in the vessel holdup. Whenever the initialization mode is changed, HYSYS forces the simulation case to re-initialize. There are three options available on the Specs page of the Dynamics tab of the vessel.
Whe... |
Problem Statement: Which files need to be preserved for modeler products file archiving? | Solution: During dynamic run of modeler products, multiple files are created in the working folder. For file archiving purposes and compatibility issues related to future versions, the following file types should be saved:
1. For any of the Modeler products, the primary file .acmf, .dynf, .ada, .bspf etc should be save... |
Problem Statement: How to Use Workbook Backup Utility? | Solution: You have several options for configuring automated backups of internal Aspen Simulation Workbook data.
To configure backups:
In the Model Variable Organizer, navigate to Configuration | Application.
Choose the location where you would like to store the backup files.
If enabling automatic backup, set the optio... |
Problem Statement: On launch, Mtell View may return the following SQL Authentication error:
Server Error in ‘/AspenTech/AspenMtell/MtellView’ Log in Failed for user ‘xx/xx’.
Exception-An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information abou... | Solution: Change the registry entry for Authentication from ‘Integrated’ to ‘SqlServer’:
Invoke the Windows registry editor regedit.exe. This is typically found in the folder C:\Windows.
Navigate to the following key: Computer->HKEY_LOCAL_MACHINE->SOFTWARE->AspenTech->Aspen Mtell->Suite->Configuration.
Select “Authenti... |
Problem Statement: How to resolve Broken Variable Links? | Solution: When you activate a simulation it is possible (perhaps because of the simulation being modified outside of ASW) for some links to be broken. When this happens, Aspen Simulation Workbook will inform you of this.
If you click OK, ASW will open the organizer to a filtered view of the model variables, showing on... |
Problem Statement: Can I combine different objects on the flowsheet into a sub-flowsheet and assign a specific fluid package? | Solution: User can combine different objects on the flowsheet by just highlighting all required objects, then right click and choose “Combine into Sub-Flowsheet” option.
Once the new Sub-flowsheet is created you can assign a specific fluid package using Fluid Package Associations. Go to Home Ribbon, Simulation Section... |
Problem Statement: User is unable to use the sensor prediction rank button when working with anomaly view. | Solution: The Sensor Prediction Rank becomes available for Failure Agents, while the Operating States option becomes available for the other types of agents. This is mainly because Failure Agents are looking for patterns of failure in specific sensors of the data being processed; while the Anomaly Detection agent is l... |
Problem Statement: After using a petroleum assay in my simulation, I notice the calculated saturated vapour pressure is not similar to my plant/lab data. Why? | Solution: Provided that the petroleum assay data has been correctly input (i.e. appropriate basis, e.g. mass or volume; appropriate standard, e.g. TBP, ASTM D86, etc), ensure that the light ends have been included in the data input prior to assay characterisation.
It is also very important to include the water conten... |
Problem Statement: How can user model blocking the bypass of Baffle hole to Tube OD and Baffle OD to Shell ID in Aspen Shell and Tube Program? | Solution: In Aspen Shell and Tube Program, the user can reduce clearance, even to zero to model such situation. If the exchanger is later cleaned and the clearances open up. The original clearances can be input.
Keywords: Blocking the Bypass, baffle clearance
References: None |
Problem Statement: Why do I get different Enthalpy and Entropy values reported in Aspen HYSYS and Aspen Flare System Analyzer similar? | Solution: Properties like Molar Entropy and Molar Enthalpy are measured from a particular reference point (Pressure / Temperature) which is assumed to be zero. This reference point is different between Aspen HYSYS and Aspen Flare System Analyzer. That is why the values of Molar Entropy and Molar Enthalpy reported for t... |
Problem Statement: How can I set an On-Off controller using digital control point and Boolean latch gate operations together? | Solution: This can be done adding three digital control point operations and one Boolean latch gate operation.
Open the attached HYSYS case “OnOff_starter.hsc”.
We would like to control the level of V-100 (height = 1.127 m) through valve VLV-101. If the level is above the maximum level (0.80 m) the desired actuator pos... |
Problem Statement: What's the maximum temperature supported Non-Ferrous material plates in ACCE? | Solution: Below is a table listing all Non-Ferrous materials available on ACCE and the maximum temperatures they withstand.
System Material Internal Pressure Max Temp External Pressure Max Temp
° F ° C ° F ° C
A1100 400 204 400 204
A3003 400 204 400 204
A5052 400 204 400 204
A5083 150 66 150 66
A5086 ... |
Problem Statement: What's the maximum temperature supported Heat-Treated Steel material plates in ACCE? | Solution: Below is a table listing all Heat-Treated Steel materials available on ACCE and the maximum temperatures they withstand.
System Material Internal Pressure Max Temp External Pressure Max Temp
° F ° C ° F ° C
A353 250 121 900 484
A353 250 121 900 484
A553 250 121 900 484
A517A 650 343 650 343
A... |
Problem Statement: How can I set the Aspen Inferential Qualities debug switches without reloading the application? | Solution: You can set the debug switches for Aspen Inferential Qualities from the Production Control Web Server (PCWS), if you are using 2006.5 or newer, which does not require reloading the application.
Procedure is as below:
1. Go to the PCWS home page.
2. Go to the Configuration tab, select AspenIQ under column Sets... |
Problem Statement: Aspen Process Explorer has the ability to store FREE or FIXED Comments for pre-configured Q records on Statistical Process Control(SPC) Charts such as an XBAR chart. These can be viewed in Aspen Process Explorer, aspenONE Process Explorer ,SQLPlus etc..
A FREE Comment is any text string that an opera... | Solution: provides the configuration that needs to be done for the Q record.
Solution
The pre-configured list of FIXED Comments is defined using a Q_FIXEDCommDef record. A default records is provided with the standard InfoPlus.21 snapshot called Q_Fixed. You may use & configure that record or else build yourself anothe... |
Problem Statement: Error Access denied: No license code is available for the specified feature on this host. when using Aspen Licensing Dashboard. | Solution: Aspen Licensing Dashboard requires SLM_RN_FNC_LICDSHBRD license key in your license file. If this license key is missing you will get Error Access denied: No license code is available for the specified feature on this host. when using Aspen Licensing Dashboard.
Using SLM License Profiler check and verify if y... |
Problem Statement: What's the maximum temperature supported Low Alloy Steel material plates in ACCE? | Solution: Below is a table listing all Low Alloy Steel materials available on ACCE and the maximum temperatures they withstand.
System Material Internal Pressure Max Temp External Pressure Max Temp
° F ° C ° F ° C
A202A 1000 537 900 482
A 202 1000 537 900 482
A202B 1000 537 900 482
A203A 1000 537 900 482... |
Problem Statement: The Aspen Manufacturing Suite (AMS) of products includes the database (Aspen InfoPlus.21) as well as the many other products that can be used with the database, such as Aspen Cim-IO, Aspen SQLplus, Aspen Process Explorer and Aspen InfoPlus.21 Administrator..
There already exists a few AspenTech knowl... | Solution: The Short answer is that very little, if anything at all, needs to be manually performed at a DST change.
The important thing to realize is that our software assumes that all data that is stored in the IP.21 Database historian has an internal timestamp that is actually in Coordinated Universal Time (UTC).
UT... |
Problem Statement: I have selected my external file under Customer External Files | Steel Material on my project basis view, however when I evaluate my project, there are no changes on the steel price. | Solution: Unlike most external files such as Civil Material or Indirects - Proratables, for Steel Material indirect file must be selected from Steel Material | Select and then applied to the project under Civil/Steel Specs | Steel material external file or apply to a specific area under Area Steel | Steel material exte... |
Problem Statement: Can the fin alloy ratio be defined in Aspen Plate Fin Exchanger? | Solution: The fin alloy ratio cannot be defined directly. As an option, the fin thermal conductivity value can be specified in Program Options | Thermal Analysis.
Keywords: Fin alloy ratio, Fin thermal conductivity, alloy ratio
References: None |
Problem Statement: What's the maximum temperature supported Non-Ferrous material plates in ACCE? | Solution: Below is a table listing all Non-Ferrous materials available on ACCE and the maximum temperatures they withstand.
System Material Internal Pressure Max Temp External Pressure Max Temp
° F ° C ° F ° C
A1100 400 204 400 204
A3003 400 204 400 204
A5052 400 204 400 204
A5083 150 66 150 66
A5086 ... |
Problem Statement: What's the maximum temperature supported Heat-Treated Steel material plates in ACCE? | Solution: Below is a table listing all Heat-Treated Steel materials available on ACCE and the maximum temperatures they withstand.
System Material Internal Pressure Max Temp External Pressure Max Temp
° F ° C ° F ° C
A353 250 121 900 484
A353 250 121 900 484
A553 250 121 900 484
A517A 650 343 650 343
A... |
Problem Statement: How to change the fluid package of single or multiple objects in Aspen HYSYS V10.0 | Solution: You can change the fluid package for a single or multiple objects using “Change Fluid Package” option. To use this approach user should select a stream or highlight several objects on PFD, right click and choose “Change Fluid Package”.
Note, if you change the fluid package of the stream, the package properti... |
Problem Statement: How to change the fluid package for a single material stream ? | Solution: Go to simulation environment, select and click on the stream, for which you want to modify the fluid package. Once the Stream Window appears, go to Worksheet tab/Conditions.
Navigate to Fluid Package Row and select from drop down list the desired fluid package.
Note, if you change the fluid package of the st... |
Problem Statement: How do I create insert library file(*.ILB) by using insert file(*.INS)? | Solution: An Insert Library is a convenient tool that provides large amounts of fixed data, such as physical property data, to all users in a group. Please go through the procedure below.
Create a working directory for storing all insert files(*.INS)
Open “Customize Aspen Plus V8.X”
Provide working directory path in co... |
Problem Statement: How does EDR Mechanical determine the Lowest Stress Ratio? | Solution: In general, the Stress Ratio for a specific material is calculated as the stress at the Test Temperature divided by the stress at the Design Temperature. The Design Temperature is specified by the user, while the Test Temperature is, by convention, 70 F or 20 C. To retrieve values at design and test temperatu... |
Problem Statement: In the Pipe Segment unit operation, the user can choose the Aziz, Govier & Fogarasi correlation for modelling vertical 2-phase flow. The flow regime is based on the modified superficial velocities of the vapour and liquid phases. What are the definitions of these terms? | Solution: The modified superficial velocities are defined as follows:
Further information on this correlation can be found in the original reference: Aziz, K., Govier, G.A., and Fogarasi, M., Pressure Drop in Wells Producing Oil and Gas, Journal of Canadian Petroleum Technology, July-September 1972, pp 38-48.
Keywords... |
Problem Statement: The IF statement within the Spreadsheet unit operation does not appear to compare numerical values correctly. For instance, when 'identical' values are compared, the IF statement states that they are not equivalent. | Solution: This behaviour is because that the values being compared may not be truly identical (though with the number of significant figures shown, they may appear equal). Such discrepancies can occur for a number of reasons but the most common ones are due to unit conversion.
Keywords: Spreadsheet, IF statement, unit ... |
Problem Statement: During the execution of your MS Excel VBA code, you get a VBA Run-time error 70 (Permission denied). | Solution: Though there are many methods that can lead to this issue, the general philosophy behind this error is that your VBA code is trying to write (i.e. input) to a variable that is considered output or locked (by another process).
A typical example would be trying to modify segments within the pipe segment model. ... |
Problem Statement: Is it possible to calculate the Research Octane Number (RON) for a pure known (i.e. not hypothetical) component in Aspen HYSYS? | Solution: For the calculation of the Research Octane Number (RON) in Aspen HYSYS, the stream should have AT LEAST three (3) components with non-zero composition. A workaround to roughly estimate pure component RON in non-petroleum assay stream is to create a stream with three components and set mole fraction for the de... |
Problem Statement: Currently in Aspen HYSYS, it is not possible to back calculate the composition of an unknown feed stream to a mixing point (Mixer, Balance, Separator or Tank unit operation) if the mixed product stream is defined as a Petroleum Assay (and all the other feed streams are fully defined). | Solution: It is helpful to think of this as the mathematical equation: A + B = C (where A, B are the feed and C is product). In this case, A and C are known, but not B. This equation requires 'back-calculation' to solve in its current form. The workaround is provide a 'forward calculating' input for the solver to use. ... |
Problem Statement: How do I get a collections of utilities of a certain type in Aspen HYSYS through VBA Automation? | Solution: The property UtilityObjects from HYSYS.SimulationCase can be used to retrieve the collection of all utilities in a simulation case. However this property doesn't take an indexer to narrow by type the elements like the HYSYS.Flowsheet.Operations does (seeSolution 144577).
This simple piece code illustrates h... |
Problem Statement: During the execution of your MS Excel VBA code, you get a VBA Run-time error 70 (Permission denied). | Solution: Though there are many methods that can lead to this issue, the general philosophy behind this error is that your VBA code is trying to write (i.e. input) to a variable that is considered output or locked (by another process).
A typical example would be trying to modify segments within the pipe segment model. ... |
Problem Statement: When Aspen Audit and Compliance (AACM) is installed in the MS Cluster environment, it may not work correctly after a failover.
This KB Article shows how to properly configure AACM in an MS Cluster environment. | Solution: Make sure that the AACM Extractor Service is not running on the inactive node. This service must be stopped and disabled both on the active and inactive node because it is not part of the failover process.
Furthermore, do not run the AACM manager console (MMC) on either node while making a failover switch bec... |
Problem Statement: How to import symbols from AutoCAD to Graphics Definer? | Solution: To import symbols from AutoCAD to Aspen Basic Engineering (ABE) | Graphics Definer follow the next steps:
1) Start Graphics Definer from the Start menu: Start | Aspen Basic Engineering | Graphics Definer.
2) Go to File | Open. On the Open window, browse to the location of the AutoCAD drawing file (either *... |
Problem Statement: How does multi-valve analysis work in Aspen Plus/HYSYS PSV Sizing? | Solution: When sizing a relief valve, the capacity used is equal to the required orifice area divided by the available orifice area. This figure should not exceed 100% because that indicates the valve is undersized for the given scenario. On the other hand, grossly oversizing the valve is also not recommended because t... |
Problem Statement: How does multi-valve analysis work in Aspen Plus/HYSYS PSV Sizing? | Solution: When sizing a relief valve, the capacity used is equal to the required orifice area divided by the available orifice area. This figure should not exceed 100% because that indicates the valve is undersized for the given scenario. On the other hand, grossly oversizing the valve is also not recommended because t... |
Problem Statement: What is “Wall Specification” when defining tubes in exchanger geometry? Is there any difference by choosing “Average” or “Minimum”? | Solution: When you define the tubes in exchanger geometry, you will find two choices for “Wall specification”: “Average” and “Minimum”:
The choice of tube wall specification usually has no impact on the heat transfer performance. It is used to aid the purchase specifications.
Minimum Wall requires that the tube thickn... |
Problem Statement: How does heat transfer occurs in cross flow exchanger in presence of Distributors? | Solution: Distributors can be specified for axial flow streams in crossflow exchangers. In this case there is a two dimensional grid covering the exchanger. Distributors are, however, modeled using the same assumptions as for pure axial flow. The distributor heat transfer and geometry is averaged across the distributor... |
Problem Statement: The Wobbe Index can be calculated from the HHV (higher heating value). However, one may observe that the 'hand calculated' Wobbe Index (using the Heating Value reported in Aspen HYSYS) is not the same as the reported Wobbe Index (as calculated by the program). | Solution: Aspen HYSYS follows the ISO 6976 procedure for calculating the higher and lower heating values (HHV and LHV respectively) used in the Wobbe calculation. This procedure utilises heating values tabulated for different hydrocarbons.
In the stream property calculation (where the LHV and HHV values are calculated... |
Problem Statement: How is the liquid holdup defined in the Pipe Segment? | Solution: The liquid holdup is defined as the ratio of the volume of a pipe segment occupied by liquid to the volume of the pipe segment, at a given point in the pipe segment. It is a fraction (no units) which varies from 0 (for all gas flow) to 1 (for all liquid flow).
The remainder of the pipe segment is, obviously,... |
Problem Statement: For the characterization of solids, one approach is to define a mesh of particle size distribution (PSD) and specify the PSD mass fractions. Is there a model in Aspen Custom Modeler to replicate the PSD options available in Aspen Plus? | Solution: The attached model replicates the options available in Aspen Plus solid options.
PSD Mesh
- user: the user specifies the upper size for each class
- equidistant
- geometric
- logarithmic is not implemented
PSD distribution
- user
- normal
- log normal
- RRSB
- GSS
Keywords: PSD, derf, distribution, model
Re... |
Problem Statement: For the characterization of solids, one approach is to define a mesh of particle size distribution (PSD) and specify the PSD mass fractions. Is there a model in Aspen Custom Modeler to replicate the PSD options available in Aspen Plus? | Solution: The attached model replicates the options available in Aspen Plus solid options.
PSD Mesh
- user: the user specifies the upper size for each class
- equidistant
- geometric
- logarithmic is not implemented
PSD distribution
- user
- normal
- log normal
- RRSB
- GSS
Keywords: PSD, derf, distribution, model
Re... |
Problem Statement: This knowledge base article documents example Visual Basic for Applications (VBA) code needed to open a saved Aspen Process Explorer document via a Click event. | Solution: Aspen Process Explorer VBForm allows the user to include Visual Basic controls and associate VBA code with certain events. The following code sample would launch a new instance of Aspen Process Explorer with document file C:\temp\Document1.apx
Private Sub CommandButton1_Click()
RetVal = Shell(C:\Program Fil... |
Problem Statement: ERROR: Invalid value in schedule_time
when trying to make records unusable that contain a Schedule_Time field, like scheduleactdef and others. | Solution: Field must be undefined before making the record unusable. To make it undefined, remove/delete any value present in the field, do this by typing a question mark character and press the RETURN key to commit the change.
Keywords: Invalid value
schedule_time
Databasesavedef
References: None |
Problem Statement: Is Aspen Flare System Analyzer applicable for design of low pressure flare system, like continuous vents (not emergency)? | Solution: Yes, Aspen Flare System Analyzer (AFSA) would be able to model continuous flares as it is a steady state simulator.
You can run the Design mode as it has three different calculation modes as explained in Article ID 000031924
Keywords: Low Pressure Flare, Continuous Vent
References: None |
Problem Statement: When I run the diagnostic described in | Solution: How do I troubleshoot the error message Unable to load simulation engine. Probable cause: Insufficient disk space or memory.?, I get the error, the program cannot start because ntvdm.exe is missing from your computer. How can I fix this issue?
Solution
This error is most likely due to a conflicting or missing... |
Problem Statement: How do you Implement Composition Delay behavior ? | Solution: Delay or lag time in dynamics is almost obvious. Here are the typical delay or dead time one would expect in different control operations
Pressure sensor: < 0.2 seconds
Thermocouple with thermo well: 6 to 20 second
Resistance temperature device (RTD) with thermowell: 6 to 20 seconds
Differential pressure leve... |
Problem Statement: Aspen Production Record Manager (APRM) aliases provide an easy way to make a more user-friendly name for an InfoPlus.21 tag, like this:
Once the Alias has been created, then in a Aspen Process Explorer trend the alias can be added to a (APRM) plot instead of the related InfoPlus.21 tag.
But how c... | Solution: The first step to take advantage of the aliasing capability of APRM is configuration, which has a couple of parts. This Knowledgebase article uses the example of the AspenChem demo. This simple process ends with three storage tanks. Each batch can finish by storing its product in any one of the storage tanks... |
Problem Statement: When attempting to add a role to the database permissions of the Aspen InfoPlus.21 Administrator, the user is unable to retrieve (or view) the Security Roles that have been defined (and are visible) in the AFW Security Manager. The following error message is received:
failed with an empty roles li... | Solution: This problem can be resolved by refreshing the AFW Security cache files and the Aspen InfoPlus.21 AFW cache file.
Stop Processing and clear cache files
1. Stop the Aspen InfoPlus.21 Database
2. In Control Panel services (services.msc) stop the following services:
AFW Security Client Service
Aspen InfoPlus.21... |
Problem Statement: When I try to launch any of the Economic Evaluation programs from the Windows taskbar, an error reading Error initializing Aspen - will appear and the application will not launch. | Solution: The root of this error is the way in which the shortcuts were added to the Windows taskbar.
When any of the Economic Evaluation products (Aspen Capital Cost Estimator, Aspen Process Economic Analyzer and Aspen In-Plant Cost Estimator) UI is open, the customer can right click on the taskbar icon and choose to ... |
Problem Statement: Why are the stream properties of my external stream different from those of my internal stream? | Solution: If you are using a different property package for the column than for the rest of the simulation, there is a risk that the internal streams have different properties than the corresponding external streams. This is due to the fact that different property packages perform flash calculations differently. Aspen ... |
Problem Statement: What is the recommendation to handle the Bromine Number for the HBED and the Hydrocracker reactors? | Solution: In Aspen HYSYS Petroleum Refining, the recommendation is to specify the Bromine Number in the HBED reactor instead of letting the model to calculate it. For the Hydrocracker, this is not a limitation.
The difference between the HBED and the Hydrocracker is that the HBED does all its calculations in Equation O... |
Problem Statement: When using Acid Gas – Chemical Solvent property package with MDEA in Aspen HYSYS V9 or prior, the regenerator heat duty predicted when specifying lean H2S loading may be too high. How shall a user improve the calculation results? | Solution: The root cause is that the electrolyte model parameters related to MDEA-H2O-H2S in V9 or prior were determined using VLE data of Jou et. al, 1982, which are inconsistent with accepted GPA data.
Aspen HYSYS V10 contains a revised set of electrolyte model parameters that better match the plant performance. Th... |
Problem Statement: By default Aspen Custom Modeler uses the density to identify the second liquid phase in vapour-liquid-liquid equilibrium. There are, however, cases where the user would prefer to identify the phase by one or more key component(s). | Solution: The attached zip file contains a document that explains how to use the key components to identify a second liquid phase. The physical properties is embedded in the simulation file. The code is in the model vlle2. The parameter liqIDMethod is used to specify the method to identify the second liquid phase. If ... |
Problem Statement: You may need to backup, archive or even purge data from the Aspen Production Record Manager database. | Solution: There are three options to be ale to work with your batches or data.
The administrator will allow you to:
1. Backup
The Production Record Manager Administrator allows you to allows you to export historic batch data for a single batch area to a single data file or across multiple batch areas to multiple data f... |
Problem Statement: It is observed that a rather large simulation using partial differential equations is solving slowly. Is there any setting that could improve the speed? | Solution: You could give a try to the transpose option in the Run, Solver Options, Linear Solver, with M48 solver.
When checked, MA48 uses a transpose of the matrix instead of the original matrix when solving linear systems. This has the effect of changing the direction in which MA48 searches for pivots. For some model... |
Problem Statement: What is the difference between the hydrocracker product transition and the hydroprocessor product transition? | Solution: The standard hydroprocessor product transition was designed to map from HCRSRK to the petroleum assay directly. This is better than the petroleum transition since the kinetic lumps have large gaps in boiling ranges. For this reason, the standard hydroprocessor product transition has become the default transit... |
Problem Statement: What might be done when this error message is produced when accessing the Aspen Production Record Manager Batch Query Tool or a similar error is produced when using another AspenTech application?
Text of the error:
BatchQueryTool
Run-time error '6':
Overflow | Solution: In at least one instance the application was being run not locally on a user's system but rather by the user accessing it through a Citrix server. That particular situation was solved by having the user log out of the Citrix server and then their user profile was deleted by someone who administers the server... |
Subsets and Splits
No community queries yet
The top public SQL queries from the community will appear here once available.