ENGINEERED WITH PASSION
KORF HYDRAULICS
UTILITIES
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 is a minor upgrade to include user requests and fix known bugs. It is free of charge for all registered user of version 2.0.
Bug List
Bug report for Korf Hydraulics Version 2.1 as of October 2007.
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
This issue will be addressed 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\.
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
This is a confirmed bug that will be corrected
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.
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.
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.
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.
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.
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.
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.
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
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.
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.
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.
Soluton
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.
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