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Problem Statement: What is the criteria for Ice form First in hydrate formation utility? | Solution: Ice Forms First is shown when the calculated hydrate temperature is lower than the freezing temperature of the stream.
This freezing temperature is calculated by a proprietary internal method and is dependent on the type of impurity present in the aqueous phase. Specifically, if the fluid for which the hydrat... |
Problem Statement: In the Fluid property package view | Tabular tab what is Use PPDS? | Solution: If you have the PPDS database, you may select the database by clicking the checkbox in the Use PPDS column. PPDS (Physical Properties Data System) is a pure component database provided by NEL (http://www.ppds.co.uk/). Please contact ppds@nel.uk if you require this databank.
Keywords: PPDS, tabular
References:... |
Problem Statement: When double click on a Aspen HYSYS .hsc file in Windows Explorer, the file is opened in the default version of Aspen HYSYS. How can I set up the default version of Aspen HYSYS? | Solution: You have to register the version which you want to set up as a default version when you open any file. You can register the default version from the command prompt. Open the Administrator Command Prompt, go to C:\Program Files\AspenTech\Aspen HYSYS 2006.5, and type hysys /regserver. A pop-up window will say t... |
Problem Statement: Suppose the Define from Other Stream option was used to initialize a new stream. Later the model is developed into a non-trivial sized flowsheet. Given that the source stream ID is not recorded within the Aspen HYSYS simulation, is it possible to find the source stream where the current stream data w... | Solution: Currently this information is not recorded as part of stream data. The idea here is to capture the identical elements between the original and the copy. If the temperature, pressure and compositions are copied, the temperature, pressure and molecular weight must be the same. If only compositions are copied, m... |
Problem Statement: When using the Fired API521 mode within the Depressuring Utility in HYSYS, if the C3 value is specified to 0, the results are the same as the adiabatic mode. This is inconsistent with the Dynamic Depressuring - A Practical Guide document, which states that if C3=0, the initial wetted area is used dur... | Solution: The Dynamic Depressuring - A Practical Guide document corresponds to an earlier version of the Dynamic Depressurization Utility. Even though it is still a useful guide for the many aspects of the utility, some changes have been made to the application. Since v2004, the wetted area is no longer calculated by t... |
Problem Statement: When I have different streams connected to a mixer and one of them has zero flow, the outlet stream does not have the same temperature as the feed stream with a flow. | Solution: When there is a material stream without a flow entering a mixer and this stream has a lower pressure that the other material streams entering the mixer, the outlet stream from the mixer shows a different temperature to the one expected.
The reason for this could be that the mixer is using the lowest pressur... |
Problem Statement: How does one change the number of stages in a distillation column? | Solution: Two methodologies can be employed; change the total number of stages by supplying a new value in the Num of Stages entry box (on the Design | Connections tab) or click the Edit Trays button on the Design | Connections tab and provide required information.
Changing the total number of stages results in Aspen H... |
Problem Statement: How does one generate a cooling curve for an air cooler? | Solution: Starting with Aspen HYSYS V7.3 you can generate the cooling curve within the Air Cooler unit operation via the Performance tab (selecting the PLOTS page will display the curves in graphical format, whereas the TABLES page will display the results in a tabular form).
For Aspen HYSYS V7.2 and lower versions the... |
Problem Statement: SQL Server 2005 SP3 is a pre-requisite for Aspen One V7.3 installation. However, installation of SQL Server 2005 SP3 failed. PC experiences rebooting problem. | Solution: This error occurs on a PC with Windows XP SP2 where user has added a manifest that has the Microsoft Windows Vista extension to an .exe or a .dll file. User needs to upgrade to Windows XP SP3. Alternatively, user can apply KB 921337 from Microsoft (http://support.microsoft.com/kb/921337).
Keywords: Reboot, re... |
Problem Statement: How do I reset the sub-flowsheet for the depressuring Utility if I want to go to default subflowsheet?
Sometimes, the user may have made changes directly in the subflowsheet associated with a depressuring utility. Here is a simple way to rebuild the subflowsheet. | Solution: The fix is to switch the fluid package for the subflowsheet to a different one. Afterwards, the subflowsheet will be recreated when clicking on Run in the depressuring utility, and the program will also reset the fluid package back to the default.
Steps:
1. In Basic environment at Fluid Pkgs tab, change fluid... |
Problem Statement: How do I get the Cloud point or Pour point of a stream? | Solution: Aspen HYSYS does not provide a standard method to calculate cloud point however, you can use some external correlations to calculate a value for each component in a User Variable, but this requires some programming knowledge. Or if you have the formula (ASTM 2500 may have a relevant equation), you can also cr... |
Problem Statement: Definitions of Total Power Loss and Linker Power Loss specifications in Aspen HYSYS | Solution: The Total Power loss or Linker Power loss is applicable when linking a series of compressors and or expanders via a common shaft and is defined as:
Where:
WLinkLoss is the Linker power Loss;
WExpander is the Expander duty;
WCompressor is the Compressor duty.
Total Power Loss specification is available for Ste... |
Problem Statement: What are the component names of p-Sulphide and b-Sulphide? | Solution: p-Sulphide = Di-n-Propyl-Sulfide or Di-n-Propyl-Sulphide. It's CAS number is 544-40-1.
b-Sulphide = Di-n-Butyl-Sulfide or Di-n-Butyl-Sulphide. It's CAS number is 111-47-7.
Keywords: p-sulphide, b-sulphide
References: None |
Problem Statement: Can the Fired Heater operation handle hypothetical components? | Solution: The Fired heater operation performs pure hydrocarbon combustion calculation only. Hypothetical components will not have heat of combustion value. As a result, Aspen HYSYS can not report the heating value and can not calculate heat of combustion for these products.
Keywords: Fired Heater, hypothetical
Referenc... |
Problem Statement: I want to update the names of a large number of Aspen HYSYS operations and/or stream names which follow a regular naming pattern. | Solution: It is quite frequent to see the names of the streams and of the unit operations of large Aspen HYSYS models following a naming pattern and in some cases these names need to be updated manually.
The Aspen HYSYS automation sample attached with the incident is a small MS Powershell script which can be used to au... |
Problem Statement: How do I model an isochoric flash in Aspen HYSYS? (eg: a system which is blocked in and remains at pressure whilst being cooled to ambient temperature) | Solution: There is no direct way to model isochoric (constant molar volume) flash in HYSYS, however one can use an Adjust operation to force the actual volume flow to be equal by either modifying the pressure or the temperature.
The attached example demonstrates how one can find the final pressure reached once the syst... |
Problem Statement: What sizing equations are used in Fisher valve of Depressuring Utility or valve? | Solution: In Depressuring utility, Fisher valve use the Universal Sizing equation instead of fisher equation in Fisher Manual. This equation model is very similar to the Fisher equation. The difference between the two is the backwards compatibility when the valve has both vapour and liquid flowing through. The Universa... |
Problem Statement: When linking Excel to Aspen HYSYS, there might be issues referencing the Aspen HYSYS type library. This | Solution: provides the steps to fix this problem.Solution
To correct Aspen HYSYS type library reference in Excel you need the Administrator rights to the PC you are working. You also will need to make sure that the reference in the macros are referencing the correct version of Aspen HYSYS.
That can be done following th... |
Problem Statement: Can I specify the Watson K Factor in Aspen HYSYS? | Solution: The user can directly specify the Watson K Factor in Aspen HYSYS. This is the default option in the program. If this value is not specified by the user, then the program automatically calculates the Watson K Factor.
The Watson K Factor is used to characterize crude oils and crude oil fractions and it is defin... |
Problem Statement: How are the liquid levels defined in a separator with a boot for carry-over calculations? | Solution: For a separator with a boot, the liquid levels are defined based on the bottom of boot as datum.
If heavy liquid is in the boot only, then the height of heavy liquid is height in the liquid in boot.
For light liquid it will be Height of Boot+liquid level in vessel.
When entered these into carryover calculatio... |
Problem Statement: Why are there drastic changes in outlet liquid streams after I add water in a three phase separator? | Solution: Addition of water can change the three phase separator's behavior significantly. For example you have light hydrocarbon and heavy hydrocarbon in liquid outlet streams of a three phase separator. If you add water, the aqueous phase will become the second liquid phase. The light and heavy hydrocarbon phases wil... |
Problem Statement: The D86 95% (Petrol) point calculated by property Correlation Manager and Boiling point utility are different. | Solution: In HYSYS, user should not apply D86 95% correlation on stream using property Correlation Manager because this will give a different D86 Petrol Point result than Boiling Point utility. In HYSYS only the Boiling Point utility and Cold Property utility will give correct D86 temperatures.
In RefSYS, user can appl... |
Problem Statement: How to copy a material stream along with the utility (eg.depressuring utility) from one simulation file to another? | Solution: There can be a scenario where you need to copy a stream along with the attached utility from one large simulation to the other to continue further study on it. For example, you have a huge steady state simulation with large number of unit operations, subflowsheets and logical operators and want to carry out t... |
Problem Statement: Is it possible to specify and report volumetric flowrate at normal conditions using Aspen HYSYS? | Solution: To input volumetric flow rate in normal conditions (0C and 1 atm) choose Nm3/h as the unit when entering molar flowrate.
To report calculated volumetric flow rates at normal conditions, open your session Preferences and select Nm3/h as the unit of measure for Std Gas Flow. Note that you will need to clone the... |
Problem Statement: What's New in Aspen HYSYS V7.2 - New Functionality in Aspen Properties | Solution: Aspen HYSYS V7.0 introduced access to the Aspen Properties chemical compound databases and physical and chemical property calculation methods. This introduction more than doubled the thermodynamics capabilities of HYSYS, and made over 13,000 new compounds (mostly organic) available to HYSYS users.
The enabled... |
Problem Statement: How do I add the additional tabs in EDF file? | Solution: In order to add additional tabs in the EDF interface, you first click the bottom of tab and highlight the name of tabs. If you click the right button (P1), you select Page tabs properties .
Figure: P1
You add additional tabs, for example: Parameters, Results tabs. You need assign a value for each tab (Paramet... |
Problem Statement: In new license file, we could not find any keys such as SLM_Extensions_OLGAS, SLM_Extensions_PIPESYS, SLM_HYSYS_OLGAS, SLM_HYSYS_OLGAS3P for OLGAS in Pipesys and pipesegment. Do we need any additional license keys from Aspentech to run OLGAS in PIPESYS after getting the license from SPT group in Hysy... | Solution: After October 31, 2010, AspenTech no longer offers the PIPESYS or OLGAS technologies from SPT Group as part of our aspenONE Engineering suite. Customers have to license either PIPESYS or OLGAS directly from SPT Group.
Customer will need to install V7.2 CP2 and hotfix (130562) from the support site. After that... |
Problem Statement: Results displayed in Aspen HYSYS do not match with the results displayed in the TEMA sheet when using HTFS or EDR to design the heat Exchanger.
For example,
- Results in HYSYS
- Results in the TEMA Sheet | Solution: In HYSYS, open the Heat Exchanger window.
Check the Ignored option at the bottom right of the window.
Then uncheck it. The program will update the calculations and the results in the TEMA sheet will match the ones in HYSYS.
Keywords: Heat Exchanger
TEMA sheet
Match results
HYSYS
References: None |
Problem Statement: How does one view pure component properties if using the Aspen Properties database in Aspen HYSYS? | Solution: When using the Aspen Properties database in Aspen HYSYS, the component properties will not be displayed on the standard pure component property view. The properties of a given component can; however, be viewed by the following method:
1. Select the component of interest from the Component List and click t... |
Problem Statement: Why do the tray sizing utility and the rating tab have two different diameter or different results?
Tray sizing utility and Rating tab show two different results. Which one should I trust? | Solution: Results of tray sizing or tray rating utility should be read from from the respective utility. It does not have any connection with the Rating tab in the column view window. The rating tab is for dynamic mode and not for tray sizing purpose. The rating tab contains default numbers. You have to change the diam... |
Problem Statement: What is Modified ASTM RVP method? | Solution: In V7.2 a new RVP correlation Modified ASTM is added to the list of RVP calculation methods. This method is a proprietary modification to the ASTM method based on the attached paper.
Keywords: RVP, ASTM, Modified ASTM.
References: None |
Problem Statement: Can I create a Template in V7.3 and use it in an earlier version of an Economic Evaluation product (like V7.2)? | Solution: No you can not use a Template from V7.3 in any earlier versions of Economic Evaluator products. The Template feature is new to V7.3 and the earlier versions will not recognize it. Any Templates you create in V7.3 will be able to be used in future releases because they will also have the Template feature
Keywo... |
Problem Statement: Similar to Aspen Plus behavior, a HYSYS model that uses EO subflowsheet usually generates a number of temporary files in between runs. But unlike Aspen Plus, the temporary files are not in the same folder as the model file.
Where are these files located on my hard drive? | Solution: They are located at the Temp folder of the logged-in users' profile folder, for example, C:\Documents and Settings\songt\Local Settings\Temp.
Keywords: Temporary files, EO, equation oriented, Aspen Properties
References: None |
Problem Statement: Are there any example files describing Liquid - Liquid Extraction in Aspen HYSYS? | Solution: In the attached word document tutorial, a simple liquid-liquid extraction process in HYSYS is explained.
A liquid stream containing 60 mol% water and 40 mol% acetone entering at 25 C, 1 atm, and flowing at a
rate of 1 kgmol/s will be extracted with a pure MIBK stream at the same exact conditions as the feed.
... |
Problem Statement: I have developed extensions that I have added to my HYSYS simulations. I noticed that they show in the palette under the Custom section. Currently they show up as blank icons. How can I define my own icons to show? | Solution: You need to put an icon file in the same folder as the extension. And it should automatically be added to the palette.
Notice that the filename for the icon should be the same and the extension and that the image types supported are ico, png, bmp, jpg and jpeg.
A 32 x 32 image size is acceptable as any other ... |
Problem Statement: Unable to go to simulation environment from oil environment. Error message: Estimating Properties of NBP[1]: Is there any Upper Temperature Limit for TBP Data for assay? | Solution: No there is no limit, till the correlations are valid.
You have an option to change the correlation to calculate the properties. Most of the time it resolves the issue.
1. Enter oil environment and Go to the Correlation Tab to add a Correlation.
2. Change the correlation for properties, it is failing. For exa... |
Problem Statement: How to add RVP in stream table? | Solution: Double click on the stream table || Add Variable || Calculator || select available RVP correlations || OK.
The available RVP correlations are
Reid Vapor Pressure
Reid VP at 37.8 C
API 5B1.1[RVP]
API 5B1.2[RVP]
ASTM D323/73-79[RVP]
ASTM D323-82[RVP]
ASTM D4953-91[RVP]
ASTM D5191-91[RVP]
Aspen API[RVP].
Keyword... |
Problem Statement: The standard methods to register an extension on Windows Vista and Windows 7 don't appear to work. How does one register an extension on these operating system? | Solution: In general, to register an extension, you need to be an administrator on the machine. In Windows Vista and Windows 7, even though you have logged in as an administrator registering an extension may fail (both through the Tools | Preferences menu inside Aspen HYSYS and using the regextn executable). This is be... |
Problem Statement: Why am I seeing a Push pin mark instead of Maximize and Minimize buttons on the properties view window? | Solution: In the preferences if you check the Use Modal Property Views this push pin will appear (see below).
Once you uncheck the Use Modal Property Views in the preferences the normal window will appear with Maximize and Minimize buttons.
Keywords: pushpin, maximize, minimize, property, view, preferences
References: ... |
Problem Statement: New Feature in Aspen HYSYS V7.2 - Compressor and Pump Offsets | Solution: Compressor curve offset calculations
An offset term is now available for compressor head and efficiency curves. The offset is applied to the head and to the efficiency calculated from the user-supplied curve coefficients. This allows for a much simpler work flow to adjust head and efficiency to plant data wit... |
Problem Statement: I am using the DBR Amine property package to simulate an amine tower. I am using an industrial amine, however the results I'm getting from the tower is not consistent with that supplied by the Manufacturer. | Solution: Whenever you choose the DBR Amine package, also select the Li-Mather Model as the thermodynamic model for aqueousSolutions, when the model selection form appears. With the Li-Mather model, the amine package is modified to simulate three phase behaviour by combining k-values from Peng Robinson with k-values fr... |
Problem Statement: How can one determine the phase compositions inside the vessel when depressuring a three phase system? | Solution: It shall be noted that for the 3 phase system, the liquid and liquid out stream composition is not representative of vessel liquid inventory. The composition corresponds to what liquid will go out if the liquid valve was open. This corresponds to the liquid out nozzle size and oil / Aqueous interface level. H... |
Problem Statement: For some modeling purposes, it may be desirable to combine several components into a single hypo component. How can one create an average component to represent a group of several components in a HYSYS model? | Solution: For the convenience of this discussion, we will refer to the component representing the group as the hypo average, and the components included in the group as contributing components.
The first step is to determine the relative amounts of each components to be lumped. If you have several feeds containing th... |
Problem Statement: The paper published by Wing Y. Wong PRV sizing for exchanger tube rupture is a well establish guideline in the field to analyze a tube rupture case. In this paper, four scenarios are identified where the fluid in the high pressure side flows through a sharp break to the low pressure side.
The scenari... | Solution: In V8.6 and below, Aspen HYSYS can only take into account the following scenarios:
· Vapor flowing through break without phase change
· Liquid flowing through break without phase change
· Two-phase (vapor and liquid) flowing through break
In V8.8, all scenarios are taken into account, ... |
Problem Statement: Is it possible to run different optimization problems within the same simulation case? | Solution: The user can run different optimization problems with the Hyprotech SQP optimizer. This can be done in two different ways:
1) Selecting only the desired optimized variables/ constraints to be included, by ticking the boxes highlighted in the screenshot below.
2) The user can create several separ... |
Problem Statement: When the tag number of a unit operation or material stream is too long, it is often shown overlapped in the report print out data sheet. How do I show all the characters? | Solution: For example, case G-2.hsc, the tag number for the Pump is P-100 ADR/102-STX00 (Figure 1).
The report printout datasheet for heat exchanger, E-101 shows overlapping of the words P-100 ADR/102-STX00 and Pump (Figure 2).
To show all the characters for pump P-100 ADR/102-STX007, follow the procedures below:
1.Ope... |
Problem Statement: How to separate solids in Dynamics, the solid separation unit Operation (Such as Cyclone and Filters) doesn't work in Dynamics. | Solution: Three phase separator can be used to model solid separation in Dynamics.
Refer to the attached HYSYS case files. The files can run in HYSYS 3.2 and later.
The attached file demonstrate how separator train can be used to study continuous solid process. In the attached file, the Separator needs two flow spec ... |
Problem Statement: What is the latest version of the Aspen HYSYS-OLGA link extension? | Solution: The latest version of the Aspen HYSYS-OLGA Link extension is V6.2. This is included with the installation of Aspen HYSYS (V7.2-V8.6).
This can be seen on the unit operation name as shown below.
Keywords: version, OLGA, HYSYS_OLGA
References: None |
Problem Statement: Is it possible to export the Aspen HYSYS Workbook to Excel? | Solution: Starting with Aspen HYSYS V7.1, the user can export the HYSYS workbook to Excel without using any external utility tools which use OLE linking functionality.
All default workbook tabs and any customized workbook tab can be exported directly to Excel. This can be achieved by opening the Workbook and selecting ... |
Problem Statement: Can Aspen HYSYS model azeotropic systems? | Solution: Aspen HYSYS is able to handle azeotropic systems as long as an appropriate property package is selected.
The Equilibrium Plots extension available inSolution 116293 enables the generation of binary and ternary plots, which can be helpful when analyzing azeotropic systems.
Keywords: azeotrope, azeotropic, e... |
Problem Statement: Triolein, (C17H33COO)3C3H5, is a triglyceride that is frequently used to represent the reactant oil in biodiesel processes. However sometimes the properties like heat capacity, density or enthalpy do not match the ones of the reactant oils such as canola, rapeseed or palm. | Solution: The properties can be modified using the tabular pacakge.
The first step is to clone the existing Triolein component in the HYSYS database. FollowSolution document 129729 for guidance on how to do this.
After the component has been cloned, go to the Component List. A component is created with the name Triol... |
Problem Statement: Are the heating values calculated on dry basis or wet basis? | Solution: The heating values are calculated on a wet basis. Existing water in a stream are included in the heating value calculations.
Keywords: Heating value, basis, dry, wet
References: None |
Problem Statement: I couldn't find start button in adjust operation. Where did it go? | Solution: You will find start button in adjust window, when you will first set up the Adjust operation. You will press it to start it solving but this button will disappear after the first time it solves. Adjust will continue to re-calculate whenever necessary.
Keywords: adjust, start
References: None |
Problem Statement: How to hide and reveal label or name in the PFD? | Solution: The label or name of a stream or unit operation can be hidden or revealed following the steps given below:
Select the stream or unit operation.
Apply right mouse-click on the object (stream or unit operation).
To hide the label, select 'Format Label' followed by 'Hide Label' from the listed options.
To reveal... |
Problem Statement: What are the new Process Flow Diagram (PFD) improvements in Aspen HYSYS V7.2? | Solution: The following improvements are made to the Process Flow Diagram (PFD) in Aspen HYSYS V7.2
? Object types (for example, unit operations or utilities) are now shown in front of object names in view title bars and FlyBy tool tips.
? A switch for Ignore/Restore Unit Op is now part of the obj... |
Problem Statement: Data Tables let you monitor key process variables in both steady state and dynamic modes. Variables for all Data Table features are selected in a single location. Variables added to the data tables have the same Unit Set of your model. The problem is that when you copy values from the process data ta... | Solution: To use the same Unit Set of your model, you have two options:
1) Aspen HYSYS V8.4 includes a button called “Send to Excel” which will send the variable with the same unit set of your model. This button has been included since the release of Aspen HYSYS V8.4.
This image shows how the Units Set is conserved.
... |
Problem Statement: A stream cutter is automatically added in the flowsheet when you use two fluid packages in the simulation. However, when the user changes a value in any stream, an inconsistency error appears. | Solution: The user should make sure that the outlet stream of the cutter is not specified. This stream has to be calculated from upstream. Therefore, the user will need to delete all specifications for conditions and composition from the outlet stream.
Keywords: stream cutter, over specified
References: None |
Problem Statement: I am using 'sparse continuation solver' method. When I try to switch to another solving method, Hysys gives me error as below and don't let me change the method. How can I move ahead? | Solution: While using sparse continuation solver, if you want to switch to another method, then you have to press 'clear all' on Parameters|2/3phase page first, to remove 'check' on every tray.
After this you will be able to change the solver method without any difficulty
Keywords: sparse continuation, Hysim I/O method... |
Problem Statement: Where can I find the Hyprotech SQP optimizer diagnostic file? | Solution: The diagnostic file for the Hyprotech SQP optimizer is created in the working Temp directory: C:\Documents and Settings\Username\Local Settings\Temp
This file is named as HyprotechSQP-20091224-100445-454.log where HyprotechSQP is followed by the date in the format yyyymmdd and the time from the computer syste... |
Problem Statement: AspenOne Heat Exchanger Design and Rating program cannot retrieve information from Aspen HYSYS. | Solution: Verify that the Aspen HYSYS Directory path does not have an exclamation (!) mark, otherwise the system will not recognize the folder.
Keywords: EDR
HYSYS
Heat Exchange
References: None |
Problem Statement: How to enter the ASTM D7096-05 data into HYSYS Oil Manager? | Solution: HYSYS does not have internal conversion method for this ASTM D7096-05 method. According to ASTM documentation, it is a superior method to predict the boiling curve for petroleum products with a final boiling point of 280 C
D86 method uses Engler Flask - simple but less accurate. TBP method uses 15-100 distill... |
Problem Statement: Why can't I select a separate fluid package for column models in HYSYS like I can for other unit operation models? | Solution: In most unit operation models, you can select the fluid package for that model from the property view menu for that model. However for column models, specific fluid packages must be assigned differently since columns are generally multi-unit operations that require a subflowsheet.
To assign a specific fluid... |
Problem Statement: How to export the stream from column environment to main flowsheet i.e. stream connected between a TEE and heat exchanger | Solution: if a stream in the column environment is attached to a tray section or a separator it can be exported to main flowsheet via Flowsheet TAB | Internal Streams | Add and export(more details inSolution 109247).
But if the stream is not a boundary stream or not attached column or a separator, then the above proced... |
Problem Statement: New Feature in Aspen HYSYS V7.2 - Utilities Enhancements | Solution: Enhancements to the Envelope Utility
The new Enable Fixed User Points checkbox on the Performance tab, Table page of the Envelope Utility makes it easier to prepare data for export to Excel or Aspen Simulation Workbook. Once the performance table data is available in Excel, you can plot the phase diagrams; as... |
Problem Statement: Why can't I see the value of Surface Tension for a mixed liquid phase? | Solution: Aspen HYSYS does not calculate the surface tension for combined two liquid phases. The two liquids could potentially have multiple fluid interfaces. Aspen HYSYS can report the surface tension at one of the vapor/liquid interfaces.
Keywords: surface tension, liquid phase
References: None |
Problem Statement: How does oil manager blend different oils? | Solution: Step -1 Each of the oil in oil manager is calculated and its working curve is generated. We will have following basic information for each assay:
Point #
Moles
Cum. Moles
NBP [F]
Mole Wt
Mass Density [API]
Viscosity 1 [cP]
Viscosity 2 [cP]
User Prop1 [..]
User Prop2 [..]
At this point th... |
Problem Statement: I want to add an orifice that is not part of the standard API 526 orifices. How do I do that? | Solution: In the Customize tab of the ribbon click on the Custom Orifices button.
This will display a window with the standard orifices besides A,B,C,U and W. These are free spaces that you have to add your own orifice. Just check the Add Custom box in the appropriate orifice and it will be customizable space. You can ... |
Problem Statement: How can I define an Assay if my distillation curve contains both Light and heavy Ends, To what extent can I represent the Light Ends with Library components and the Heavy Ends with Hypo-components? | Solution: The best approach depends on the users objective; Depending on the accuracy of the Assay data available, then probably using library component for the light ends is the preferred option, reason being that it is more representative of the defined light components as the correlations implemented in HYSYS for th... |
Problem Statement: Are Fp and Xt parameters (ISA 75.01) available in a valve? | Solution: ISA 75.01 is implemented in version 2006.5. You can choose either Fisher Universal or ANSI/ISA format in rating page. If you choose a manufacturer (i.e. other than universal gas sizing and simple resistance) you will find this choice in version 2006.5 and up. The picture below shows the interface.
Keywords: F... |
Problem Statement: How can I control the mole ratio between component A and B in a stream ? | Solution: You can do this by using a spreadsheet in Aspen HYSYS, as in the attached sample file.
In the file, there are 3 components in stream 1, Methane, Ethane and Propane. To control the ratio of the components in stream 1, enter formulas in the spreadsheet.
These are the steps:
1. Specify the mole fractio... |
Problem Statement: I have added Higher Heating value from property correlation control but it doesn't show same units in spreadsheet as in stream window. Why? | Solution: There can be a few reasons of why don't you see Higher heating value units same in spreadsheet and stream view.
1) If you have added Higher heating value from property correlation control, then it should be added in spreadsheet via Calculator variable. If you add higher heating directly from variable list, th... |
Problem Statement: How do I obtain Std Ideal Liq Vol Flow of selected components in liquid phases via OLE automation? | Solution: There is not a direct way to get Std Ideal Liq Vol Flow of individual and selected components in liquid phases. However, it can be calculated by the following equation based on Hysys Simulation Basis:
LiqVolFlow =Total Molar Flow ? MW/( Ideal Density) (1)
Ideal density =1/(sum(x/std ideal liquid density)
... |
Problem Statement: How to get rid of Insensitive message in LNG exchanger? | Solution: The insensitive message in the status bar of a heat exchanger says it could not solve the equation (mass and enthalpy balance and heat transfer eqn with specs such as temp / UA). At one point during the iterations, the error is not changing anymore. To work around this problem, the specs for the heat exchange... |
Problem Statement: How to set Aspen Properties or COMThermo as the Default Basis in Aspen HYSYS | Solution: By default, when you add a new component list or property package in Aspen HYSYS V7.0 or later, it will set the default component list and property package as HYSYS. But to if you would like to set Aspen properties as Default Component list and Aspen Properties as Default fluid package then
1. Go to Tools | P... |
Problem Statement: How can I link a Shell & Tube (TASC+) thermosiphon heat exchanger model inside an Aspen HYSYS Column subflowsheet? | Solution: ThisSolution assumes that you already have a thermosiphon reboiler model in Shell & Tube (TASC+) or that you know how to create one.
If you are starting a distillation column from scratch follow the following procedure, otherwise if you already have a distillation column replace the reboiler with a heat exc... |
Problem Statement: Which .NET framework is needed for writing an .NET based extension | Solution: All HYSYS v8.XX have 4.0 NET framework. If user is creating a NET based extension, he will have to specify 4.0 framework in his project.
To do that,
1. Open the properties of the project. On the Compile page, click bottom Advanced Compile Options...
2. Choose the framework from Target framework (all configu... |
Problem Statement: I'm working with a plot in Aspen HYSYS and want to manipulate the display units for the data, independent of the simulation unit set. | Solution: While looking at the plot view, simply right-click in the background of the plot and select Graph Control.
In the Graph Control menu, select the Axes tab. For each listed variable on the left side of the menu, you can select/de-select the Use Default Units check box. To use the default simulation unit set, ch... |
Problem Statement: Why is the liquid which is coming out of a valve, a higher temperature than the liquid in the inlet?
Some gases can have negative Joule-Thomson effect. Why a liquid stream is showing this behavior? | Solution: Negative Joule-Thomson effect is rather common for liquids. The Joule-Thomson coefficient is typically negative for liquids at temperatures well below their critical temperature. That means, in general, we should observe a temperature rise across a valve if the fluid is liquid.
Keywords: liquid, J-T, Joule-Th... |
Problem Statement: When creating a new correlation set, the Save correlation set to file option is selected. But when loading the saved set, the program shows that the file was not created: | Solution: This problem is solved by modifying the Stream Correlation Sets File path. Click on the Tools menu and the Preferences submenu. The Session Preferences window is now open. On the Files tab, select the Locations page and scroll down to select the Stream Correlation Sets File path. The default is 'Support\Strea... |
Problem Statement: How to model Divided wall column in Aspen HYSYS? | Solution: There are different ways to model Divided wall columns in Aspen HYSYS. An informal presentation about modeling DWCs and a sample simulation case with 2 conventional columns and the equivalent DWC is attached alongwith.
Keywords: divided wall column
References: None |
Problem Statement: Why does Aspen HYSYS give different compressor outlet temperature from GPSA method? | Solution: There were number of queries from the users who compared the compressor outlet temperature applying the GPSA method using the isentropic exponent, k. Note that the GPSA method estimates the temperature difference assuming ideal gas behavior, k = Cp/(Cp-R), not the rigorous k, (k=Cp/Cv) as available in Aspen H... |
Problem Statement: How to report the total liquid holdup for a pipe segment in Aspen HYSYS | Solution: The total liquid holdup is not reported in the Aspen HYSYS pipe segment but can be calculated manually using the Aspen HYSYS spreadsheet. The liquid fraction for each segment is imported into the Spreadsheet, each individual segment volume is calculated by multiplying the segment length by the total pipe area... |
Problem Statement: How do I create Datablock for user defined unit operations? | Solution: Refer to the attached documentation.
You need to create a rdf file with the same name as the extension's edf file. For example if you have created an extension Saturate Extension, you would need to create a saturate.rdf file and place it in the same directory as the saturate.edf file.
The RDF file needs to me... |
Problem Statement: Why does the cut point in the Stream Property Spec result in a different temperature than predicted by the Boiling Point Curves utility? | Solution: Within the HYSYS column specifications for crude columns there are three cut point specifications available.
1. Column Cut Point
2. Column Stream Property Spec | Cut Point
3. End Point Based Column Cut Point
These can be seen from Monitor | Add Spec or Specs | Add pages of the column property view.
The Column... |
Problem Statement: For simulations containing many Unit Operations, it can be very tedious for the next engineer trying to find the input specifications for certain Unit ops. Is there a way in Aspen HYSYS to allow users to access certain object inputs without having to search individual object in the PFD? | Solution: The Flowsheet Summary can be used to view the user input values.
Select Flowsheet | Flowsheet Summary from the main menu. The Flowsheet Summary will categorize the objects to allow easy access of any streams or unit ops in your PFD.
1. Navigator page will allow you to navigate through individual object withou... |
Problem Statement: What does FittingNo in the Pipe Segment (sizing page) represent? Is this the number of specific units that one would like to include in that segment (e.g. a bend)? | Solution: The 'FittingNo' is the quantity of a particular fitting that will be modeled by a particular segment. 'Fitting No' (which becomes an active spec when choosing a fitting) was introduced in the HYSYS Pipe Segment since V7.0 to model multiple (similar) fittings at one go.
When this number is greater than one, th... |
Problem Statement: What is the equivalent method for ASTM D7213 | Solution: According to American Society for Testing and Materials (ASTM) the boiling range distributions obtained by ASTM D7213 test methods are theoretically equivalent to those obtained by true boiling point (TBP) distillation. They are not equivalent to results from low efficiency distillation such as those obtained... |
Problem Statement: What are differences between first tray in section and first tray in column in the section property mode in tray sizing utility? | Solution: In the HYSYS tray utility there is an item on the Design tab, Specs option called Section Property Mode. The HYSYS Unit-Ops guide explains that:
The Section Property Mode drop-down list enables you to select the start tray for the Property Mode calculations. HYSYS provides two selections:
? The First Tray... |
Problem Statement: Why the size of the separator is not changed no matter what I change for the demister, thickness and demister to top. | Solution: The separator sizing utility is only accounting for separation based on the Souders-Brown equations. It simply uses the densities to find a maximum vapor velocity and then the vapor flowrate to find the area. This leads to the diameter used in the utility. The other parameters are calculated by subtraction, c... |
Problem Statement: How do I delete a pipe segment without deleting all the following segments? | Solution: User tries to delete a pipe segment in between several other segments and when click Delete Segment all the following segments are also deleted.
If you only want to delete a column in your pipe segment editor, you have to highlight the number of the segment as shown below.
On the other hand, if you want to ... |
Problem Statement: When you try to simulate a Component Splitter there are three ways to define your equipment:
Feed Fraction to Products, Fraction in Products and Flow in products.
What are the differences between these three definitions? | Solution: An example:
Let?s suppose that we have a Feed stream with 5 components:
X1F F = F1
Component 1
X2F F = F2
Component 2
X3F F = F3
Component 3
X4F F = F4
Component 4
X5F F = F5
Component 5
F
Feed
And in the splitter you have:
In order to specify the equipment, you need to add the split per component:
1. ... |
Problem Statement: How to simulate the valve percent open position with time? | Solution: You need to make modification on valve actuator position.
A. Select radio button Linear on valve property interface (Dynamics ll Actuator)
B. The rate at which valve can open or close is defined in the row “Actuator Linear Rate [%/second]”. So if you put 5 here, it would mean that valve will open 5 % ev... |
Problem Statement: Can the hydrate utility be used on mixtures containing high concentration of CO2? | Solution: In the attached document, you will find two validation cases of hydrate utility applied to mixtures with high concentration of CO2 (~90 mol%) and small amount of methane (~5 mol%). The results show that HYSYS hydrate utility is adequate for these mixtures.
Keywords: CO2, hydrate utility
References: None |
Problem Statement: Is it possible to recover the original inlet component lumped when the Aspen HYSYS oil characterization method is selected using the delumper? | Solution: When the HYSYS Oil Characterization method is used in lumping, the generated hypothetical components do not have the knowledge on the distribution of the inlet components. Therefore, if the inlet components are first lumped using this method, the delumping process will not recover the original inlet component... |
Problem Statement: What phase does the surface tension reference in the column Performance | Plots tab? | Solution: For a Vapor-Liquid column, the surface tension corresponds to liquid phase interface. In a Liquid-Liquid column, the surface tension corresponds to the aqueous phase.
Keywords: surface tension, column, profile, performance
References: None |
Problem Statement: How does one effectively use the Load Workspace and Save Workspace features in Aspen HYSYS? | Solution: There are two ways to use the Load Workspace feature.
Use Load Workspace to switch between different cases opened within the same instance of Aspen HYSYS
Suppose you have two open cases (tutor.hsc & P-1.hsc). At any given time you can view only one case or file. The Load Workspace feature can be used to s... |
Problem Statement: Do not see the EDR - Shell & Tube option in Aspen HYSYS Heat Exchanger Model under Design Tab | Parameters page | Solution: This issue can be fixed by performing the Version Fix for Exchanger Design and Rating (EDR) Program. For the following, user need Administrative Privileges.
1. From Windows Start menu, Go to Programs | AspenTech | Exchanger Design and Rating V7.1 (latest version of EDR program) | Version Control Utility.
2. S... |
Problem Statement: To observe the behavior of a compressor with performance curves, a plot of inlet flowrate vs outlet pressure can be useful. In many cases, a user would like to plot volume flowrate at the inlet vs outlet pressure. Since volume gas flow is not a specified stream parameters, we present scheme to genera... | Solution: First, we need a scheme to adjust a specified flowrate (molar flow or mass flow) for a given volume flowrate. This can be achieved through an Adjust unit. The Adjust unit modifies the molar flowrate until the calculated volume flowrate calculated for the stream is within the tolerance to the user-specified va... |
Problem Statement: What is the easiest way to display Hydrate Formation Utility results in workbook? | Solution: Please open any example Aspen HYSYS case from below sample folder
C:\Program Files\AspenTech\Aspen HYSYS V7.X\Samples
Procedure:
1. Open Tutor1.hsc
2. Tools/Utilities/Add Hydrate Formation Utility/ Select stream as Feed1 & please specify name as Feed1 under performance one can able to see the result... |
Problem Statement: After simulating a model using both the PIPESYS extension and the pipe segment, the final temperature, pressure and heat loss matched rather closely. However, when I checked the overall HTC, the difference between these two methods is considerable. How can this be? | Solution: The difference between the Overall HTC reported in the PIPESYS extension and in the pipe segment is due to the diameter that they are related to. In other words, the overall HTC reported in the pipe segment is based on the outside diameter of the tube, while the one reported in PIPESYS is based on the outside... |
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