==== AFT Impulse 8 (Version Date 2021.04.28) Release Notes ==== This file contains the changes that have been made to Impulse 8 *** Changes for Version Date 2020.08.10 *** None: Initial Release *** Changes for Version Date 2020.11.04 *** >> Changes to computation logic that could impact results << 1. PFA: The API-674 standard uses a pulsation frequency to calculate the maximum peak- to-peak pressure. Previously the harmonic component of this was always considered to be one but this could yield an unconservative pressure range. The 2014 Errata of the standard clarified this to be the harmonic at the pump speed. Impulse was updated to use the harmonic of the current scenario, based on the pump's speed and frequency target which is used in the calculation of the pulsation frequency. 2. Finite open tanks with a non-zero tank bottom elevation could produce a false artificial transient. This has been resolved. 3. Spray discharge with a steady state special condition set to closed was causing an artificial transient. This has been resolved. 4. A flow control valve set to control to zero flow would trigger a failed closed state and set the failure mode accordingly. This has been resolved. 5. Several Passive-Passive Relief Valve models either did not converge, or converged incorrectly. For many configurations any existing error was small, but for internal balanced valves the error could be significant. Additionally, these valves could sometimes falsely present a "cycling" warning. All of these issues have been improved. 6. When using dual cyclic events, the second event could start at an incorrect value, depending on the shape (increasing/decreasing) of the transient data. This has been corrected. 7. Improved convergence of internal balanced relief valve. >> Changes to data management that could impact results << 1. The Visual Report Auto Color Map could round the value it uses for minimums above the actual minimum value when the "Digits to Display" is set less than the resolution of the minimum value. This has been fixed. >> Changes that do not impact results << 1. Fixed and issue with the form display when editing tank junctions which are stored in the component database. 2. The results were not transferring to the initial conditions. This was fixed. 3. Fixed a problem where an error would be created if there is no junction or pipe output parameters selected and you right-clicked on a pipe or junction on the Workspace to bring up the Inspection Window. 4. Fixed an issue where the right-click format menu for Graph axis will not stay open when the Graph tab is floating. 5. Fixed a bug where a cancel dialog window appears when the Output tab is floating and the Run command is clicked. 6. Fixed a bug where floating the Workspace does not allow a property window to be displayed. 7. Fixed an issue where holding the Shift key down while selecting pipes might cause a locked pipe to move. 8. Made improvements for copy/paste procedure in larger models when the paste location is not in the same area as the copy location. 9. Fixed a problem on Graph Parameter Window when using Profile Plot and plotting using when no groups exist. 10. During a batch run, if Excel Export had no Export Items or no applied Export Items, the export could give an error message. This has been fixed. 11. The Visual Report Auto Color Mapping in certain cases would generate erroneous data ranges if the "Generate" button was clicked more than once. This has been fixed. 12. SSL Module: Excel Export now allows exporting SSL data. 13. Creating more than 10 new Force Sets would cause the Force Set Name to stop incrementing at "Force Set 10" and then create additional duplicates with the Force Set Names "Force Set 10". This has been fixed. 14. Fixed an issue that caused Relief Valve Remote Sensing information to be erased upon opening the property window when the Passive profile was previously selected and Remote Sensing information was also previously entered. 15. Fixed an issue where the number of connected databases could be written to the file in error. To fix, simply load the affected scenario and save the model. 16. Fixed an issue that caused a Tee/Wye Component Database selection to be erased upon opening its Property Window. 17. Made improvements to graph axis-generation in Pump Configuration window and Curve Configuration window. *** Changes for Version Date 2021.02.22 *** >> Changes to computation logic that could impact results << 1. Fixed a problem with REFPROP mixtures where the properties would only be calculated on a molar basis even if mass was selected. 2. When using dual cyclic events, the second event could start at an incorrect value, depending on the shape (increasing/decreasing) of the transient data. This has been corrected. 3. When using DGCM with Pump Off Flow Through, a pump could incorrectly show a change in pressure across it. This has been fixed. 4. Corrected calculations with REFPROP fluid database where mass fraction ratios were being treated as mole fraction. 5. Turbine junction was providing erroneous results if the Rated Torque was inputted in any units other than lbf*ft. 6. Corrected transient calculations for pumps with impeller trimming. 7. Corrected calculation of pump Estimated Inertia for pressure vs. flow pump curves. 8. Corrected K factor adjustments for ATKF on reducers during transients. >> Changes to data management that could impact results << 1. Fixed a problem when the transient on a tank was set at a percent of the steady- state. When the model was read back in, the Percent units would be changed to the liquid level units and would cause an artificial transient. >> Changes that do not impact results << 1. Fixed problem displaying the Bill of Materials. 2. Fixed a problem with importing multiple Fittings & Losses when some were already in the database. 3. Fixed a problem if a scenario was promoted which had pipes deleted in its original parent, they would not remain deleted. 4. Fixed a problem importing group names when importing forces from a CSV file. 5. Fixed a problem with multi-scenario graphs if the start/stop time was in units other than seconds for the current scenario. 6. Fixed an issue where the "Keep Network eLicense Checked Out" menu item would not stay checked. 7. Fixed an issue where the dashed Box outlining closed junctions does not show when both the junction name and the junction number are not displayed on the Workspace. 9. Fixed an issue where the Time label was not appearing in copied animation graph images. 9. fixed an issue where the Graph Parameters Form was not reinitializing properly when changes are made to the model. 10. Fixed some PDF/RTF export issues for Print Preview. 11. Fixed an issue where the format menu for Graph titles was showing scaling values. Setting the values would cause an error. 12. In certain cases a batch run could indicate that all batch runs completed successfully when in fact they did not. This has been fixed. 13. SSL Module: Slurry Density Solid was not being exported with the proper unit conversion factors, leading to incorrect values for exported data. This only affected Excel Export data, and not data in the results. 14. When saving scenario batch run results to PDF or to data files, the filename was incorrectly created with the model file's current folder prepended to the filename. This has been fixed. 15. PFA Module: In the Section Pipes window, the Show Pulsation Graphs button caused an error and did not show the graphs. This has been fixed. *** Changes for Version Date 2021.04.28 *** >> Changes to computation logic that could impact results << 1. Added a check for a submerged pump inlet pressure being below vapor pressure. 2. Improved convergence of transient pump calculations with DGCM. 3. Fixed issue where speed and impeller trim were not being accounted for when using an interpolated pump curve with DGCM. >> Changes to data management that could impact results << 1. None. >> Changes that do not impact results << 1. Fixed an issue where custom plot names are not showing for stacked graphs. 2. Added function for Materials linking with Import Piping Layout. 3. Fixed an issue where the 'Special Condition' menu item was not functioning properly. 4. Fixed an issue where renaming a scenario below the current scenario on the scenario tree would deactivate the current scenario. 5. PFA Module: Pulse Start Time was not able to be changed from 0. This has been fixed. 6. An error would cause branch junctions in saved models to load in with different elevations at the inlet and outlet. Running the solver would produce artificial transients. This has been fixed.