Updates
| Version 2.0 was a major upgrade that was released in Dec 2005. Site licence holders of version 1.x can upgrade for free provided the annual support is up to date. |
| Version 2.1 was a minor upgrade to include user requests and fix known bugs. It is free of charge for all registered users of version 2.0. |
| Version 3.0 was a major upgrade that was released in Jul 2008. Site licence holders of version 2.x can upgrade for free provided the annual support is up to date. Version 3.0 executable was replaced with version 3.0.2 in Mar 2009, to fix bug 13 below and improve convergence for low pressure gases and laminer flow systems. |
| Version 3.1 was a significant upgrade that was released in Jun 2010. |
| Version 3.2 was a significant upgrade that was released in Jan 2012. It is free of charge for all registered users of version 3.x. |
| Version 3.3 was a significant upgrade that was released in Jan 2013. It is free of charge for all registered users of version 3.x. Version 3.3 executable was replaced with product version 3.3.1 on Jul 27, 2014 to fix bugs 20 and 21. |
| Version 3.4 was a significant upgrade that was released in Jan 2016. It is free of charge for all registered users of version 3.x. Version 3.4.1 was a minor upgrade released in Mar 2016 to add the Hysys Acid Gas components. Version 3.4.2 was a minor upgrade released in Mar 2017 to fix bugs 22 to 24. Version 3.4.3 was a minor upgrade released in Jul 2017 to fix bug 25. |
| Version 3.5 was a significant upgrade that was released in Jan 2019. It is free of charge for all registered users of version 3.x. Version 3.5.1 was a minor upgrade released in Dec 2021 to add Unisim and multi-monitor support. Version 3.5.3 was a minor upgrade released in Aug 2022 to add support for company defaults, improve the simulator interface and fix bug 26. |
| Version 3.6 was a significant upgrade that was released in Mar 2023. It is free of charge for all registered users of version 3.x. Version 3.6.1 was a minor upgrade released in Sep 2023 to fix bugs 27 and 28. Version 3.6.2 was a minor upgrade released in Jan 2024 to add reporting features and allow different Cp/Cv values (select Actual to import pre 3.6.2 values from simulators). |
Bug List - Sep 2023
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28-NPSH vapor pressure absolute value is not stored Problem Version 3.6 add the option to provide the NPSH vapour pressure absolute value in addition to the NPSH credit. However, the NPSH absolute value is not stored when the simulation is saved and reopen. Update Fixed with version 3.6.1. For prior versions, please enter the NPSH vapour pressure absolute value every time after a file is opened, or provide the NPSH credit instead. |
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27-Error message opening older files with pseudo components Problem If version 3.6 is used to open an older file containing pseudo components, an error message will be displayed for each pseudo component. Update Fixed with version 3.6.1. For prior versions, the error message does not impact the engineering calculations. Store and reopen the file in version 3.6 to eliminate the message. |
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26-Incorrect atmospheric pressure after changing units Problem With version 3.5.2 a new units dialog was implemented. Changing the units on the new dialog does not correctly change the atmospheric pressure if the user clicks OK/Save on the Options dialog. The results is that all gas and two phase properties are incorrect. Update Fixed with version 3.5.3. To display your version, right click on Korf_35.exe and select Properties then Details. |
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25-Incorrect orifice sizing under the Equipment | Calcs menu Problem The orifice sizing under the Equipment | Calcs menu is incorrect, as the pressure recovery is not included correctly since version 3.3. The orifice calculations performed in the main flow sheet are correct and not impacted by this issue. Update Fixed with version 3.4.3. To display your version, right click on Korf_34.exe and select Properties then Details. |
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24) Incorrect permanent pressure drop for choked expanders. Problem The reported permanent pressure drop for choked flow expanders are incorrect. It does not impact the actual hydraulic calculations. Update Fixed with version 3.4.2. To display your version, right click on Korf_34.exe and select Properties then Details. |
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23) Errors in the HMB routines when flows are reset to zero. Problem The flow to/from vessels, feeds and products must be positive to run the HMB. To improve convergence, Korf reset some of these flows to zero, but that causes problems in the matrix algorithms. Update Fixed with version 3.4.2. To display your version, right click on Korf_34.exe and select Properties then Details. |
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22) Overflow error for large simulations. Problem The value of some internal variables in the matrix subroutines became to large for very large simulations (thousands of pipes). Update Fixed with version 3.4.2. To display your version, right click on Korf_34.exe and select Properties then Details. |
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21) Omega choked flow velocity fails for some pipes with zero flow rate. Problem The Omega choked flow velocity method is the default since version 3.3, but fails for some pipes with zero flow rate. The runlog displays several error messages. Update Fixed with executable version 3.3.1. To display your version, right click on Korf_33.exe and select Properties then Details. For the original version, either specify a small flow rate or select another choked flow method. |
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20) Tee label cannot be hidden. Problem Hiding the Tee label has no effect, as it remains visible. Update Fixed with executable version 3.3.1. To display your version, right click on Korf_33.exe and select Properties then Details. |
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19) Choked flow is not prevented at Reducers if Tees are present. Problem Compressible choked flow is not prevented in Reducers/Expanders if Tees are present in the simulations. Update Fixed in version 3.3. For older versions, manually increase the discharge pressure to reduce the velocity to the maximum allowable velocity. Please contact us for assistance. |
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18) Flash calculations fail or are incorrect for very heavy pseudo components. Problem In general Korf uses the latest Riazi equations to estimate critical properties for pseudo components. These equations are limited to a molecular weight of roughly 700 and boiling point of roughly 600 C, and they extrapolate poorly above these limits. For heavier components, the critical properties will be incorrect which may cause flash calculations to fail. Update Fixed in version 3.3. For older versions, using very heavy pseudo components, please contact us to estimate reasonable critical properties. |
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17) Available and required specifications do not update after editing an equipment
using the popup menu. Problem In version 3.0 and 3.1 the specifications displayed in the lower left corner of the statusbar does not update when equipment is edited using a right mouse click and the popup menu. They will still be updated when a simulation is run, so it is only a display issue. Update Fixed in version 3.2. For older versions, edit equipment by double clicking on them, or click Hydraulics | Specifications on the menu to force a recalculations. |
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16) Incorrect choked flow rate for orifices with t/d from 0.5 to 1.0. Problem At an orifice thickness to bore ratio of 0.5 it is assumed the equations change from thin plate orifice to nozzle type equations. In one subroutine the criteria was 1.0 instead of 0.5, which leads to incorrect choked flow results when t/d is 0.5 to 1.0. Update Fixed in version 3.2. For older versions, use an orifice thickness/bore ratio of less than 0.5 or more than 1.0. |
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15) Flash from Fluid dialog incorrect if compositions is in mass fractions. Problem In version 3.0 flash calculations from the Fluid dialog will always assume the composition is in mole fractions, even of the user selected mass fraction. During the Heat and Mole balance calculations compositions are used correctly. Update Fixed in version 3.1. For older versions, please select Mole compositions before clicking on the Flash button in the Fluid dailog. |
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14) Available and required specifications do not update after deleting an equipment. Problem In version 3.0 the specifications displayed in the lower left corner of the statusbar does not update when equipment is deleted. They will still be updated when a simulation is run, so it is only a display issue. Update Fixed in version 3.1. For older versions, please click Hydraulics | Specifications on the menu to force a recalculations. |
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13) Vessel flash calculations are wrong for 2nd and subsequent vessels. Problem Korf 3.0 correctly perform vessel flash calculations only if the number of vessels are less than or equal to one (1). Flash calculations for the second and subsequent vessels are wrong. Update This is a significant error, and we released version 3.0.2 as part of the full install to correct this. |
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12) Korf 2.x cannot print on A2 and larger paper size Problem Korf 2.x can display large drawing sizes (NT4, XP and later), but cannot print A2 and larger sizes due to a bug in the printing routines. Update Fixed in version 3.0. |
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11) Korf 2.x incompatible with Windows Vista Problem Korf 2.x does not function correctly in Windows Vista. This happens because Vista prevents programs from writing to the Program Files folder. Korf 2.x stores the ini file, runlog and report file in the Korf\Data directory (which is usually a subfolder in the Program Files folder). Update Fixed in version 3.0. Vista users of Korf 2.x should not install Korf (and other similar programs) in the Program Files folder. Use a different folder name, such as C:\Program XP\. |
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10) Unit drop down box for Product elevation does not work Problem The unit drop down box for Elevation on the Product dialog does not function correctly in version 2.x. Update Fixed in version 3.0. In version 2.x the user has to provide the Product elevation in the units shown, and cannot use the drop down box to convert the value. |
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9) Incorrect menu colour in Windows XP Problem After customizing a Display Theme and applying it in WinXP, the menu background may not match the colour behind the menu text. Update This happens due to an incorrect UserPreferencesMask registry value (3D vs Flat menu displays) under HKCU\Control Panel\Desktop in Windows XP. To correct the behaviour follow the procedure below: - Click Start, Run, type in Regedit and click OK. - Find HKEY_CURRENT_USER\Control Panel\Desktop\UserPreferencesMask - Change the third hex number back to 07. - Restart Windows. Alternative, click on menu script to download a vbs script to toggle UserPreferencesMask. Save it to the hard drive and double click to run. |
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8) Incorrect opening of file stored under different locale. Problem Some values are read incorrectly if a file is stored using one locale (say with comma as decimal place), and then opened in another (say with point as decimal place). It happens because some variant values are inadvertently stored as text, without converting to numbers first. The following entries are affected: INI FILE - Number of Iterations - Atmospheric pressure CONTROL VALVES - Cv specified - % Opening of stroke provided - K value specified ORIFICES - Beta ratio specified PUMP AND COMPRESSORS - Pump and shaft efficiencies provided MISCELLANEOUS EQUIPMENT - K and L/D value Update Fixed in Version 2.0. This was an important bug. In older versions, please contact us for assistance in transfering older files between different locales, or use the following options: Option 1: Change your locale settings (Control Panel | Regional Settings) to match that of the originator. This option is preferred. Option 2: After opening the file, do NOT run it. Edit all the entries listed above, and convert them to the new locale settings. For example, "50,0" may be displayed as "500", instead of "50.0", so you have to get the actual values from the originator. Run the simulation, store as new file and compare results carefully. |
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7) Wrong date stamp of main executable Problem The main Korf_13.exe file is dated 1/3/19. The actual date should be Jan 19, 03. This is caused by a typing mistake in the installation program. Update Minor issue. Problem is corrected for all copies distributed after Jul 2, 2003. |
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6) Wrong density correction factor for pipe area changes Problem Korf convert between velocity and pressure (according to Bernoulli) for pipe size changes over most fittings. For gas and two-phase streams, a density correction factor is applied, which is derived from the isothermal compressible flow equations. There is a mistake in how this density correction factor is calculated, which results in a small error for some systems. For liquid systems the error is zero. Update Fixed in version 2.0. |
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5) Two Phase Flow - Hughmark holdup wrong at high velocities/low liq fractions. Problem The Hughmark Holdup is wrong for high velocity, low liquid fraction systems. The correlation in Korf is based on the curve fits (to Hughmark's original graph) presented in Chemical Engineering, July 13, 1970. The author did not indicate that the equations misbehave at Delta values (Re^0.167 * Fr^0.125 / LiqFrac^0.25) above 125. Update Fixed in version 1.4. This was an important bug. |
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4) Korf Report - Wrong liquid volumetric flow rate. Problem The liquid volumetric flow rate reported in the Pipe Line Report is wrongly calculated based on the total homogeneous density. For two-phase flows it thus gives the wrong result. Update Fixed in version 1.3. |
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3) Runlog warning: Pipe not at equipment inlet/outlet. Problem On certain monitors the Tee and Mixer does not repeatedly draw at the correct location. Over time they move away from their connecting lines. Once they are a certain distance away, Korf will warn that the line(s) is no longer connected. The simulation still runs correctly, but the warning messages are annoying. Update Fixed in version 3.0. The root cause for this problem is unknown. A partial fix is available in version 1.3, whereby the user can press Control T to realign all Tee's and Mixers. For earlier versions, the only option is to manually drag the Tee/Junction to cause Korf to reconnect the line. |
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2) Error 70 on saving report file Problem On Win2000 and with files on a network, saving the report file may generate an error. Despite the error, the report is saved correctly. Update Fixed in version 1.21. |
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1) Pipe Fluid Composition Dialog Problem If the Pipe Composition Dialog is access from the Menu with Equipment | Edit | Fluid Properties, the incorrect Pipe may be displayed. Usually the default equipment properties. It is easy to verify, as the Pipe Number will be "L" or similar, intead of the one required, say "L1". This does not happen every time and does not affect other dialogs. Solution To access the Fluid Composition Dialog: - Hold down Shift and Double click on the line label. - Or Double click on the line and click on the Composition button. Update Fixed in version 1.21. |