question stringlengths 19 6.88k | answer stringlengths 38 33.3k |
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Problem Statement: How does Model Liquid Choking check box affects Cv calculation in HYSYS DYN? | Solution: When Handle multi-phase flows rigorously is checked, HYSYS performs the sizing method with consideration of mixture of vapor and liquid. But this option may be found disabled if the inlet flow has no vapor (i.e. vf=0). You can see 6-162 in HYSYS OPS guide on this topic.
When Model Liquid Choking is checked, H... |
Problem Statement: How to Obtain Isentropic Expansion Coefficient Using Aspen HYSYS? | Solution: Aspen HYSYS could not directly report Isentropic Expansion Coefficient, k.
Based on the equation Definition: -V/P(dP/dV)T*Cp/Cv, we could get numerical derivative of dP/dV at equal temperature condition.
Actual volume and Cp/Cv are reported in Properties page at actual condition. You can calculate the Isentro... |
Problem Statement: In critical property utility, Zc value is same for all pure components, when I pick Equation of State Model. Why? | Solution: This is the nature of cubic equation of state. Except some special cases, most EOSs have a fixed Zc value, no matter what compound is used because Zc only depends on the formula and some constants of the EOS. If you try different EOS, you will find that for different EOS, they have a different value, but not ... |
Problem Statement: Are there any improvements to the Macro Language Editor in Aspen HYSYS V7.2? | Solution: It is now possible to run up to 10 specific macros directly from the Tools menu.
The macro explorer allows for direct access to the first ten macros in the designated folder. The user can use the session preferences to enter a folder for the macros as shown below:
Keywords: MLE, Enhancement, New, V7.2, Im... |
Problem Statement: API-RP-14E Erosion Velocity estimation in Aspen HYSYS | Solution: The API-RP-14E recommends C=100 for Continuous services. However, the empirical constant is not dimensionless and when user uses SI units the C is corrected by a factor of 1.22.
This conversion was not implemented correctly in the older versions (V7.3). The users will require to multiply the erosion velocity ... |
Problem Statement: What is the PR option in the GCEOS fluid package? | Solution: GCEOS model is used to define and implement your own generalized cubic equation of state including mixing rules and volume translation. When you select PR option from within the GCEOS it reduces to the PR EOS.
This is the Standard PR, not HYSYS PR. The main difference between standard PR and HYSYS PR is the a... |
Problem Statement: Fluctuation in liquid holdup volume for LNG in Dynamics | Solution: You can get in to this problem if number of zones needed is very less than what you have specified. Depending on the temperature difference between the inlet and outlet streams, you will need zones. Increasing the number of zones helps in stabilizing the LNG dynamics.
You can momentarily get around this probl... |
Problem Statement: Why do I see a negative pressure drop across the orifice plate in Aspen Hydraulics in certain conditions? | Solution: Normally one would expect a pressure drop across the orifice plate. However, sometimes users may find an increase of pressure instead of decrease.
This can happen when the flow is choked. If this unusual behaviour is observed then check the following:
1. The flow rate across the orifice is reasonable.
2. If t... |
Problem Statement: What effect does a user defined standard temperature have on standard flows? | Solution: This Tech Tip gives a brief description of the standard flow properties in Aspen HYSYS. For full details see section A.6 of the Aspen HYSYS Simulation Basis pdf manual.
Std Ideal Liq Vol Flow
Standard Ideal Liquid Volume Flow is based upon the individual ideal liquid densities of each component at standard co... |
Problem Statement: How do I copy a PFD table so it can be pasted into MS Excel or MS Word? | Solution: A PFD table is not a valid object for copy and paste functionality. If you press Ctrl+C after selecting a PFD table, you will receive the following error message:
To avoid this problem, double click on the PFD table to open the property view. Hold down the Ctrl key and click individually on every cell you... |
Problem Statement: Validation of hydrate formation in hydrocarbon and CO2 rich gas processes | Solution: There are frequently asked questions from users regarding the quality of hydrate predictions using the Hydrate Formation Utility available in Aspen HYSYS. This knowledge basedSolution has been created to present the validation of hydrate formation with experimental data found in the published literature [1, 2... |
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: Which fluid package is recommended to predict CO2 solubility in oil and water? | Solution: In general for a system with CO2 dissolved in water, we recommend the Peng-Robinson equation of state. This is valid for temperatures higher than -271 C and pressures lower than 100000 kPa. For a low pressure system (sub atmospheric) you may find that an activity model (like NRTL) may give better results.
Pen... |
Problem Statement: What is REFPROP under fluid package in Aspen HYSYS when I select Aspen Properties radio button? | Solution: REFPROP fluid package is from NIST contains properties of some components (pure components, refrigerants etc). REFPROP models to evaluate thermodynamic and transport properties of a mixture.
The NIST databank in Aspen Properties contains the REFPROP components. However, you have to choose RefProp (REFPROP in ... |
Problem Statement: What is the difference between 'vapour-liquid-liquid' and 'vapour-liquid-free water' and 'vapour-liquid-dirty water' options available in Aspen properties 'Phase handling' options? | Solution: Vapour-liquid-liquid option basically uses rigorous three-phase calculations to determine water in all the phases. The vapour-liquid option with free water or dirty water is usually used in modeling water-hydrocarbon systems. The free water or dirty water calculations are completely rigorous, except for the a... |
Problem Statement: When will Windows 8 be supported? | Solution: Windows 8 is supported in V8.2.
The supported platforms for V8.2 are the same as in V8.0, with the addition of Windows 8 (64 bit only):
Desktop:
Windows 8 Enterprise (64 bit)
Windows 8 Professional (64 bit)
Windows 7 Enterprise SP1 (32 and 64 bit)
Windows 7 Professional SP1 (32 and 64 bit)
Windows XP Prof... |
Problem Statement: How can I save a report in *.mdi or *.pdf format so that I can print it later? | Solution: You can save the report in *.mdi and *.pdf format to print it later on. Note that you should have acrobat writer if you want to get report in pdf format and you should have Microsoft office if you want report in mdi format. Below are the steps to save a report:
After creating the report, highlight the report ... |
Problem Statement: How do I prevent the warning message when I click on Interactive Size Rigorous Shell & Tube in Heat Exchanger? | Solution: If user is having multiple version of Aspen HYSYS and EDR installed on same machine then below warning message appears when user click on Interactive Size Rigorous Shell & Tube from Size Rigorous Shell & Tube drop down menu
This is due to incorrect version of EDR registered
User can register correct version... |
Problem Statement: Why is the total amount of water fraction in the Light Liquid product stream different from the user specified carry over fraction of Heavy liquid in light liquid? | Solution: When modelling water carry over in a 3 Phase Separator, the overall fraction of water in the light liquid product stream differs from User specified fraction of Heavy liquid in Light liquid product stream.
The light liquid product stream is separated in the 3 phase separator as a saturated stream.
The option ... |
Problem Statement: What's New in Aspen HYSYS V7.2 - Rate-Based Distillation | Solution: In V7.2, the full power of the well-established rate-based distillation calculations from Aspen Plus are now available in the Aspen HYSYS simulator. This provides the HYSYS simulation user with the ability to accurately model distillation towers in which mass transfer rates and heat transfer rates play import... |
Problem Statement: What are the differences between Active, Estimate and Current spec check box options in column in Aspen HYSYS? | Solution: The Active, Estimate and Current checkboxes enable to specify the status of the specification in column.
The active specification is one that the convergence algorithm is trying to meet. An active specification always serves as an initial estimate. An active specification always exhausts one degree of freedom... |
Problem Statement: After selecting the PVT launch engine button, the error message appears on the screen Access Violation Address 004cb232 in Module @PVTProPkg.exe' Read of address FFFFFFFF in Windows XP. | Solution: DBR PVT PRO will try to write a file in C:\Program Files\Common Files\hyprotech\DBRPVTProPkg. The file name COMThermoPVTPro.Pro would generate during running PVT Pro environment. If your system folder C:\Program Files folder is write-protected, you will get the following message: Access Violation Address 004... |
Problem Statement: How do I ensure that every time I load the same preference file through automation (OLE)? | Solution: Here is the code that sets the preference file via Automation.
Dim hyApp As HYSYS.Application
Set hyApp = GetObject(, HYSYS.Application)
hyApp.LoadPreferences d:\myprefs.prf
Note: Change the text d:\myprefs.prf to match your preference file, this only works when a case is open.
Keywords: OLE, automation, pref... |
Problem Statement: How does a user capture maximum percentage opening of a valve in a dynamic scenario where the valve opens and closes? | Solution: It can be easily achieved via using a user variable associated with the valve. The code looks following:
Sub DynPressureFlowPreStep()
Dim Val As Double
Val = ActiveVariableWrapper.Variable.GetValue
If(activeobject.PercentOpenValue > Val) Then
Val = activeobject.PercentOpenValue
End If
ActiveVariableWrapper.... |
Problem Statement: How is it possible to modify my component list via the Hysys Workbook without removing any component from my simulation? | Solution: In a Hysys simulation, a user can modify the components shown in the Workbook so that not all used in the simulation are visible.
To modify go to Workbook in the Home tab, this will create a Workbook tab in the Hysys ribbon. In Setup|Workbook tab window, select Compositions. In the Variables window select one... |
Problem Statement: Why different flash point method gives very different results? Which one should I use? | Solution: Different flash point methods are applicable for different type of streams. A wrong method can lead to a very wrong result.
The default method for Flash Point calculations in HYSYS (via the Cold Properties Utility, for example) is calculated by the API 2B7.1 method. The temperature range for the flash point... |
Problem Statement: How do I enter the compressor head in kJ/kg in the compressor curves? | Solution: The default unit for compressor head in the curves is in length (e.g., m, ft). If the data from the compressor vendor is in kJ/kg then the data can be converted to meter (m) and then entered in the curve data. An alternative approach would be to create a unit set cloning from the current unit.
curves[m] = cur... |
Problem Statement: What methods does Aspen HYSYS use in calculating the phase viscosities? | Solution: Aspen HYSYS uses three different models in calculating the phase viscosities depending on the type of system.
1. Mod Ely & Hanley (modification of the NBS method)
2. Twu's model
3. Mod Letsou-Stiel (modification of the Letsou-Stiel correlation)
The best suited model is automatically sele... |
Problem Statement: Why are the Auto Water Draw options disabled? | Solution: The Auto Water Draws (AWD) option available on the Parameters| 2/3 Phase page of the column property view allows for the automatic adding and removing of total aqueous phase draws depending on the conditions in the converged column.
The AWD option is available for HYSIM Inside Out (IO) or Modified HYSIM Insid... |
Problem Statement: I cannot view the files I downloaded from | Solution: 115343.Solution
These files are videos with extension SWF. SWF stands for Small Web Format. This is a file extension for a Shockwave Flash file owned by Adobe.
Therefore, you require Adobe Shockwave Player to open these files. To install, please refer to the Adobe website http://get.adobe.com/shockwave/
After... |
Problem Statement: How to model a Cold Bed Adsorption process in Aspen HYSYS Sulsim (Sulfur Recovery) | Solution: The conventional Claus sulfur recovery process is limited by reaction equilibrium considerations to sulfur recoveries in the range of 94-97%. For applications requiring an intermediate level (97.5-99.5%) of sulfur recovery, the so-called Sub-Dewpoint Claus Process or Cold Bed Adsorption Process (CBA) can be u... |
Problem Statement: Why did the Dynamic Depressuring Utility give different results in each run when the vessel contains 100% subcooled liquid? | Solution: If you are looking at the phase diagram at initial time conditions of the stream used as a Feed to the Depressuring Unit, you would find that the entire vessel somehow goes from the outside of the vapor-liquid envelope as an all liquid fluid, to the inside of the vapor-liquid envelope when venting material th... |
Problem Statement: In LNG exchanger, the composite curves for both hot passes and cold passes are calculated. How are the composite curves constructed? | Solution: A composite curve is a temperature - enthalpy plot representing the heat availability or the heat demands in a process. A heat curve is the property of a material stream. If a material stream has constant heat capacity, its heat curve will be a straight line linking inlet and outlet temperature of an exchange... |
Problem Statement: The | Solution: for RVP empty case.Solution
This is JapaneseSolution.
Please see attached pdf file (Japanese).
Keywords: Reid Vapor Pressure
RVP
Cold properties
References: None |
Problem Statement: What is the Tray Sizing Utility? What is the difference between Design and Rating modes in Tray Sizing Utility? | Solution: With the help of Tray Sizing Utility you can perform design mode or rating mode calculations on part or all of a converged column. Packing or tray information can be specified relating to specific tower internals such as tray dimensions or packing sizes, design flooding, and pressure drop specifications.
Resu... |
Problem Statement: In HYSYS, Reid Vapor Pressure is calculated according to several standards. One of them is ASTM D323 82. For some streams, RVP ASTM D323 82 may be shown as empty. | Solution: ASTM D323-82 is a standard procedure for the measurement of Reid Vapor Pressure. Liquid hydrocarbon is saturated with air at 33?F and 1 atm pressure. Since the lab procedure does not specify that the test chamber is dry, the air used to saturate the hydrocarbon is assumed to be saturated with water.
This ai... |
Problem Statement: What do the different splits types in a component splitter imply? | Solution: The separation fractions or splits (ranging from 0 to 1) must be specified for each component in the stream exiting the Component Splitter on the Splits page.
You can select either the Mass or Molar Basis for each component and select Fraction Type to either Feed Fraction in Products, Fraction in Products or ... |
Problem Statement: Can I use the same curves for any liquid assuming volumetric flow vs. head behavior is the same? | Solution: The head in a pump or compressor curve is in terms of the process fluid.
Vendors generally provide pump curve(s) in terms head of water. We can use the same curves for any liquid assuming volumetric flow vs. head behavior is same. The outlet pressure will be different for different fluid due to density differ... |
Problem Statement: How does Aspen HYSYS report phase properties when the fluid is in dense phase? | Solution: Aspen HYSYS reports a vapor fraction for a stream under supercritical conditions as zero or one. Theoretically, this value does not have a specific physical meaning since there is no distinct liquid and vapor phases in a supercritical region. However, for the purpose of flash calculations, Aspen HYSYS will de... |
Problem Statement: How do I access a Cyclone unit and its inlet and outlets through automation? | Solution: The attached MS Excel workbook and HYSYS file are used to demonstrate the access of Cyclone unit and its materials streams via automation. To use this demonstration, the user has to load up the HYSYS file Cyclone Unit.hsc using HYSYS 2006.5 or later first, and then open the Excel workbook.
Next the user will ... |
Problem Statement: Can I see the mass/molar/volume concentration in a stream in Hysys? | Solution: The mass/mol/vol fraction cannot be directly presented in PPM using Aspen HYSYS in the stream Conditions tab> Concentration. However, the Spreadsheet operation can be used to achieve this. After importing the fraction into a cell inside de Spreadsheet the user need to calculate the concentration in PPM in ano... |
Problem Statement: How do I deactivate Enterprise Databanks to get rid of the message at least one databank should be installed and registered in Aspen Properties configuration tool? | Solution: You need to select Legacy Properties Databanks in Aspen Properties Database Selector. The default path to this option is as follows.
Start || Programs || Aspen Tech || Process Modeling || Aspen Properties || Aspen Properties Database Selector. and select the legacy databanks || click OK. Then open HYSYS.
Keyw... |
Problem Statement: How can I add text to my PFD on the New interface? | Solution: On v8.0, the Add Text option is under the Flowsheet/Modify menu, under the Flowsheet section on the Ribbon
On v8.2 and later, this option shows on the Format tab, which appears when you are working on the PFD. This section also gives the user the options to edit the text.
Keywords: Text, label, PFD
Referenc... |
Problem Statement: The naming convention for the hypo components created by HYSYS Oil Manager includes starting string NBP and an index in a pair of bracket, followed by a string converted from the integer part of the boiling point value. The name for a crude hypo component is generated by Oil Manager and is also updat... | Solution: Before proceeding with this method, please understand that this is a circumvention of the design. As a result, Oil Manager will no longer update the components and their physical properties. If the original components are already linked with Spreadsheet, these links will need to be re-built after making the c... |
Problem Statement: I would like to convert ASTM 3710 boiling point data into a ASTM D-86 via HYSYS. Is this possible? | Solution: There is an open literature published by the DCG Partnership, which is an expert in manufactured chromatographic reference standards for the petroleum, petrochemical and natural gas industries.
The literature states: DCG has available an N.I.S.T. traceable by weight gravimetrically prepared calibration stan... |
Problem Statement: How do I combine unit operations and streams from a section of my simulation flowsheet into a Sub-flowsheet? | Solution: On the simulation PFD, highlight every object you want to include in the sub-flowsheet by clicking and dragging your mouse over them. Alternatively, you can hold down the Shift button while you click on all the objects to select them.
Next, right-click on any of the objects selected, the scroll due to the Cut... |
Problem Statement: Is it possible to copy a unit operation into a different case? | Solution: Highlight the desired objects on the PFD, then right click on one of the selected icons. Choose one of the following options from the ensuing menu:
Cut/Paste Objects | Copy Objects to File (Export)
Selecting this option allows you to save the copied objects into a file so that they can be used at a later da... |
Problem Statement: Why is the combined/mixed liquid viscosity value generated by the HYSYS Stream Reporter (HSR) different than that reported by Aspen HYSYS? | Solution: In the HSR, the flash calculation for combined liquid is obtained by mixing the aqueous and liquid phases. Unlike the HSR, Aspen HYSYS does not internally flash the mixture of aqueous and liquid phases, but instead directly obtains the combined liquid phase viscosity from the stream object. The same approach ... |
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: While using activity models such as NRTL or UNIQUAC from the Aspen Properties databank in Aspen HYSYS, my three phase separator only solves for one liquid phase. | Solution: The reason it does not solve normally is because the default valid phases in these fluid packages are Vapor-Liquid, thus making the 3-phase separator behave as a simple separator.
To modify this behavior, you must go to the properties environment and select the package in question. There, go to the Phase Hand... |
Problem Statement: The extension was registered successfully, however it does not show up on the list of registered dlls in the HYSYS list of extensions. The Error message below is displayed:
The extension Name###.3C extension is not available on this machine. This type of Unit Operation is removed from PFDs | Solution: The ProgID which is exposed in the edf is not the same as the ProgID for the class in the dll. So, while the extension is registered with HYSYS successfully and the class in the dll is registered with Regasm.exe successfully, the two are not linked correctly.
To resolve this error message, copy and paste th... |
Problem Statement: When the user enters the Safety Analysis environment to design relief valves, the datasheets of the corresponding valves are accessible through the Documentation Builder.
However, when the functionality is used in the same file, after being saved and reopened, an error message is displayed:
The d... | Solution: One of the reasons of this error message can be related to the Microsoft Access version if the user, who created the file, accessed the Documentation Builder through the Safety Analysis environment.
The COM call to open the *.mdb file is selected when the user clicks the Documentation Builder button. Th... |
Problem Statement: I have found two components in HYSYS’ databank with the same CAS Number. Shouldn’t CAS Number be unique per component? | Solution: The reason why there are two components with the same CAS Number is because they are the same component with a different common name.
You might find that using each of these components in a simulation show slightly different results in their flash and/or thermodynamical properties. This is because they have d... |
Problem Statement: Why do the binary interation parameters (BIP's) change for certain components in Aspen HYSYS? | Solution: The Peng-Robinson package in Aspen HYSYS updates BIP's based on temperature.
For example, the BIP's for the pairs of H2S-H2O and CO2-H2O are treated as functions of temperature. The purpose is to improve its prediction for polar and associating fluids such as water, alcohols, glycols and acid gases.
The c... |
Problem Statement: What is the definition of Boilup Ratio and what is the default basis?
Reboiled absorber requires Boilup Ratio in its last page of input expert. What is the definition and basis of it? | Solution: Boilup ratio = Vapor leaving a reboiler divided by liquid leaving the reboiler.
= Vr/Lr, with reference to the picture below.
Molar basis is the default basis of boilup ratio. You can choose a different basis (mass or volume). To do so double click on Boilup Ratio spec or select it and then click on View ... |
Problem Statement: Why does Aspen HYSYS generate the error message 'Not Licensed for Crude Distillation' when I have not created an assay in the case file via the oil manager? | Solution: If any of the conditions below are true, the user will receive a crude license error:
1) Using Oil environment or
2) Case file contains a hypo component with a normal boiling temperature > 533.1 K AND a column has been created in the simulation case.
Note that the second scenario requires the column solve... |
Problem Statement: How do I set base elevation of vessel used in the depressurization utility? | Solution: According to the API521 standard (API RECOMMENDED PRACTICE 521 1997) only the portion of the vessel that is wetted by its internal liquid and is equal to or less than 25 feet (7.6 m) above the source of flame needs to be recognized. If the vessel bottom is above 25 feet then the fire will not have any effect ... |
Problem Statement: How can I get vessel orientation via OLE Automation? | Solution: Since the separator orientation properties are not available within the HYSYS type library (they are not yet 'wrapped' for standard Automation access), it is necessary to use a 'Backdoor' method.
This can be achieved by using the code provided below.
1. Open up HYSYS with any case that contains a separator.
2... |
Problem Statement: Which are the reactors available in Aspen Hysys and what are the requirements? | Solution: Reactor Types
Yield: Set product yields from reactor; no stoichiometry required
Gibbs: Minimize Gibbs free energy to determine outlet equilibrium composition; no stoichiometry required
Conversion: Specify stoichiometry and conversion; outlet composition calculated
Equilibrium: Specify stoichiometry an... |
Problem Statement: Adiabatic cooling is the operation whereby a liquid stream (typically water) is injected directly (and mixed) into a superheated gas/vapour stream. The cooling effect (or temperature decrease) is brought about by vaporisation of the liquid as energy is absorbed by the water molecules in converting th... | Solution: ThisSolution seeks to provide the user with a flowsheet (and methodology) that can be used to model the heat and mass balance around this type of equipment. Typically, adiabatic coolers can be specified either on desired product outlet temperature or relative saturation/humidity.
See the attached simulation f... |
Problem Statement: I get a consistency error when I add a pumparound and specify the pressure drop, however, there is no overspecification. How do I solve this problem? | Solution: This particular issue is addressed in the error message window. Here is copy of the message in this scenario.
The lines in red box indicate the cause and aSolution. The cause: Draw stream's enthalpy is calculated by the column subflowsheet and the pumaround and there a difference exist that is not accepta... |
Problem Statement: Is it possible to create tab file from Hysys which can be used for Olga? | Solution: Hysys needs following support files to run OLGA
*.inp; *.tab; *.snp
HYSYS does not generate the *.inp and *.tab files. These are what the user has to provide to set-up the case.
The *.inp file is the OLGA input file that defines the problem, ie geometry, boundary conditions, etc.
A *.tab file is not necessary... |
Problem Statement: How can the data from the column stage be transferred to an internal stream within the column subflowsheet environment? What is the transfer basis for this internal stream? | Solution: To export the stage data into an internal stream within the column subflowsheet the user has to navigate to the flowsheet internal streams option within the column specification window. After selecting the add button, the user will then have to input an internal stream name, the stage, type, Net/Total and uns... |
Problem Statement: When using the depressuring utility, how is the wetted area calculated for a horizontal vessel? | Solution: Refer to the attached HYSYS file created in v 2006.5.
Variables:
L = cylinder height
h = height of liquid
W = height of head (cone/ellipsoid/hemispherical/dished)
R = cylinder radius
V = Volume of liquid
A = Surface in contact with liquid
Horizontal vessels
Cylindrical part
In the discussion below, the ... |
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: How do I save a preference set and have it load automatically every time I open my model? | Solution: You can do it only by replacing the original preference file. Make a copy of the original file (in case you need it in future). Then make the changes in preference and save the preference set as the default preference file.
Here are the detail steps.
1. Find the location of the preference (.PRF) file: Ope... |
Problem Statement: Why are the Aspen HYSYS files I save, not showing .hsc extension on the computer? | Solution: If you have selected the Hide extensions for known file types in the Folder options on the computer HYSYS files are shown without the .hsc extension. To restore the extension open the folder where HYSYS files are saved and select Tools menu | Folder options... In the View tab unselect the Hide extensions for ... |
Problem Statement: How can I clone a component from the database and modify its properties? | Solution: 1. Go to the Simulation Basis Manager by pressing Ctrl+B or selecting Simulation | Enter Basis Environment from the main menu.
2. Open the Hypotheticals Tab.
3. Click the Clone Comps button.
The Convert Library Comps to Hypothetical Comps window appears:
4. Select the component to clone on the Available L... |
Problem Statement: Can Aspen HYSYS predict oil product's TAN (Total Acid Number)? | Solution: There is no built-in feature in Aspen HYSYS to simulate TAN number however you can use User Property in oil characterization environment, which allow you to supply a property and have Aspen HYSYS characterize it with an assay.
Following are the brief steps to add user property using oil manager:
1. In the bas... |
Problem Statement: How to switch from scientific notation to normal notation when displaying numbers in Aspen HYSYS? | Solution: In Aspen HYSYS you have select the options tab.
Now select unit of measures and go to Variable formats and say format and select Format under format select Significant Figure and change the value to 6.
Keywords: Unit of Measures, scientific Notation, Significant Figures
References: None |
Problem Statement: I am converting a file from PROII to HYSYS. Where is the Stream Data defined in the PROII input file? | Solution: It is possible to use the PROII to HYSYS Convertor to change the simulation into a HYSYS file. Inside the PROII input file the stream data is specified under the section entitled the Property Stream. An example from the PROII input file is found below:
PROPERTY STREAM=002, TEMPERATURE=230.7, PRESSURE=2, &
... |
Problem Statement: What are the capabilities of Fidelity option in Aspen HYSYS Dynamics? | Solution: Aspen HYSYS Dynamics contains Fidelity (an extension of Aspen HYSYS) that provides advanced dynamic features to your simulation. It allows users to supply levels of detail that would only be available after detailed equipment drawings and general arrangement drawings have been developed for detailed dynamic s... |
Problem Statement: When you hyStdFlowVar.StdLiqVolFlow.Erase, you will get the error message. The function is not working. | Solution: Some of Standard condition properties' objectives are not fully exposed from hysys automation. You may want to try to use the backdoor variables:
Set hyStdFlowVar = hyBD.BackDoorVariable(:StdLiqVolFlow.501.0).Variable
If hyStdFlowVar.CanModify And hyStdFlowVar.IsKnown = True Then
hyStdFlowVar.Erase
End if
K... |
Problem Statement: How to configure a Remote SQL Express 2005 server to be used by remote Aspen Clients | Solution: Install a component from Process Modeling V7.1 on the SQL server and follow the steps outlined on a SQL Express 2005 server to be used by remote clients.
Launch the SQL Server Configuration Manager from Start | Programs | Microsoft SQL Server 2005 | Configuration Tools | SQL Server Configuration Manager.
1. ... |
Problem Statement: How can I open and view multiple utilities at the same time? | Solution: You can view the utilities from Utilities option under Tools menu. Select the multiple utilities(both control and shift key works for selection), and select View Utility button.
Note: Shortcut key to view the Utilities is: control + U
Keywords: open, view, multiple, utilities.
References: None |
Problem Statement: What is Damping Factor (under column Parameter | Solver page | Damping settings) and when should I modify this number. | Solution: Damping factor is used to control the step size for the solver. It helps in faster convergence of a column solver.
The Damping Factor is a multiplication factor that controls the step size used in the outer loop when updating the thermodynamic models in the inner loop. A Damping Factor of 0.4 -0.6 may provi... |
Problem Statement: How can I report scenarios results with labels? | Solution: To copy the results and labels of scenarios created in Databook (Table or Transposed Table) and paste into Excel or other program, highlight the results, go to Edit in the main menu and click on Copy with Labels. You can also use the keyboard shortcut <CTRL>+<SHIFT>+C.
Keywords: Copy, paste, Databook, table
R... |
Problem Statement: The Masoneilan equation is presented in the depressurization utility without units. | Solution: Attached document explains the derivation in SI units
Key Words
Masoneilan Equation - SI Units
Keywords: None
References: None |
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: What needs to be referenced for ASW automation? | Solution: On Excel you will need to add all the related references. To add them,
Step 1. Open Excel, and then go to ribbon bar Developer, and then click “Visual Basic” to open the VBA.
Step 2. Select “
Keywords:
References: s…” from Tools bar. If you have problem to open the reference, close Excel and reopen it “Run a... |
Problem Statement: How does the percent of maximum flooding change? | Solution: The % of maximum flooding changes depending on the correlation used to calculate the maximum gas velocity before there is flooding (Flood gas velocity). With a larger Flood gas velocity, the % of Max flooding will be greater.
When the packing size is increased, the cross sectional area for the gas flow decrea... |
Problem Statement: I am converting a file from PROII to HYSYS. How is the column defined in the PROII input file? | Solution: It is possible to use the PROII to HYSYS Convertor to change the simulation into a HYSYS file. Inside the PROII input file the column is specified under the section entitled Column UID. An example from the PROII input file is found below:
COLUMN UID=T1, NAME= COLUMN EXAMPLE
PARAMETER TRAY=13, IO=75
FEED D29,... |
Problem Statement: Is there a way to have a Degree of Freedom (DOF) analysis for my whole simulation? | Solution: In modeling operations, Aspen HYSYS uses a Degrees of Freedom approach, which increases the flexibility with whichSolutions are obtained. For most operations, you are not constrained to provide information in a specific order, or even to provide a specific set of information. As you provide information to the... |
Problem Statement: I don’t have administrator privileges, how can I select the version of Aspen HYSYS to be launched through automation? | Solution: Administrator privileges are required to register and unregister COM components for Aspen HYSYS, and therefore to set the default version of the program. However, there is an alternative method to specify through VB code the version to be launched when creating a new instance of the program.
For both starting... |
Problem Statement: Let us consider the following data are available for creating a hypo:
MWÂ Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 500
Ideal Liq Density (kg/m³)           1189
Tc (°C)                                     630
P... | Solution: The problem with the generated Hypo is that the estimated NBP is higher than the specified critical temperature and this causes problem for HYSYS. If you delete the critical temperature and let Aspen HYSYS estimate then you can use the hypo in your case.
One of the following would be the minimum information r... |
Problem Statement: How do I find the Developer menu in the Microsoft Excel Ribbon? | Solution: The Developer menu on the Microsoft Excel Ribbon is not active by default. Here are the steps to enable it.
Open File | Options
Then go to Customize Ribbon, and make sure the Developer checkbox is checked. By default, it is not checked. After that, the Developer ribbon bar would show in the Ribbon.
Keywor... |
Problem Statement: What is Adiabatic mode in the Depressuring Utility? | Solution: Adiabatic Mode – Gas blowdown
1. Models a normal gas blowdown of pressure vessels and/or piping.
2. No external heat to the system.
3. Heat flux between fluid and the vessel is modeled as fluid temperature drops.
4. When estimated by Aspen HYSYS, the Heat Transfer coefficient estimated from ... |
Problem Statement: Can I run a Case Study when I am in the Sub-Flowsheet Environment? | Solution: When in the Sub-Flowsheet Environment, you can add the variables for the Case Study Set up but when you want to run it the warning message Case study can run only in the main environment will show up.
Please move to the main flowsheet and run the case study.
Keywords: Sub-Flowsheet, Case Study
References: N... |
Problem Statement: How do I export a Material Stream from one simulation to another? | Solution: The first step is to copy and paste the stream from one simulation to another (press control in order to copy the stream) and then paste it in the other simulation, once you have done that a new Fluid Package and Component list will be created. Also you need to be aware that the composition and properties are... |
Problem Statement: What is difference between Wax Deposition temperature and Critical Wax Deposition temperature (located in the Flow Assurance tab of the Pipe Segment unit operation)? | Solution: Deposition temperature - the temperature at the pipe wall where the wax is forming.
Critical deposition temperature - the wax formation temperature at the given pressure and composition of the pipe cell.
Keywords: Wax Deposition, Pipe Segment, Flow Assurance
References: None |
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