==== AFT Impulse 7 (Version Date 2020.01.30) Release Notes ==== This file contains the changes that have been made to Impulse 7 *** Changes for Version Date 2018.11.14 *** None: Initial Release *** Changes for Version Date 2018.12.05 *** >> Changes to computation logic that could impact results << 1. Fixed unit conversion errors in the Estimated pump inertia calculation. >> Changes to data management that could impact results << 1. None. >> Changes that do not impact results << 1. Fixed a potential problem when the pump results are written to the .out file where data was written which is not applicable to the type of pump and transient mode. This did not affect the actual results. 2. Fixed an issue that prevented Translating Check Valve Force Balance models from being defined. 3. Fixed a Global Edit issue with Translating Check Valve Force Balance models. 4. Fixed an issue which could make steady state convergence difficult for Force Balance check valves which would close during steady state. 5. Fixed an issue when exporting output to Excel an error message pops up about a bad tab page name. 6. The reservoir in Impulse 7 now includes some finite tank functionality. Entering liquid level information, for a finite tank, in the transient tab would produce an error. This has been resolved. 7. Multiple fixes to the Excel Export Manager when handling graph exports. 8. Fixed an issue where pumps that were previously saved as positive displacement type then changed to centrifugal type and four quadrant data entry was attempted would not find a BEP value. *** Changes for Version Date 2019.01.02 *** >> Changes to computation logic that could impact results << 1. None. >> Changes to data management that could impact results << 1. Fixed a problem when splitting a pipe, the downstream elevation and pipe fitting losses (if specified) were not being kept. >> Changes that do not impact results << 1. Added the Visual Report Animation Feature. 2. Fixed an issue where models that were imported from Impulse version 6 or earlier could display the Pump Properties form improperly. *** Changes for Version Date 2019.01.28 *** >> Changes to computation logic that could impact results << 1. None. >> Changes to data management that could impact results << 1. Fixed a problem with the unit type used with PD pumps with transient flow data. 2. Fixed a problem exporting to Excel when running in Steady-State mode which would crash Impulse. >> Changes that do not impact results << 1. Added Reservoir pipe depth/elevation setting information to the Model Data defaults. 2. Changed Zoom behavior when objects are selected in the Workspace. 3. Fixed an issue when editing an annotation's text and then clicking 'Cancel': the text will still be changed in the annotation. 4. Enabled 'Export Force File' menu item when on Graph Results or Visual Report. 5. Fixed an issue where 'Copy Graph Image' and 'Record Animation' would not work right when the Windows Font Size is set to anything other than 100%. 6. Fixed an issue when duplicating an annotation: the 'pre-paste' window shows up behind the annotation. 7. Fixed an issue where some Pipe length values were not imported using the PCF Import. 8. Fixed an issue where Four Quadrant graphs could not be copied by using the "Copy Data" button command in the "Specify Four Quadrant Model" window. *** Changes for Version Date 2019.03.11 *** >> Changes to computation logic that could impact results << 1. Fixed an issue with Reservoirs that would cause an artificial transient if the ambient pressure was specified using an elevation table. 2. The Constant CdA loss model for Relief Valves was not working properly in Impulse 7. The issues have been corrected. >> Changes to data management that could impact results << 1. Fixed an issue that prevented running models when a REFPROP fluid was selected. >> Changes that do not impact results << 1. Minor bug fixes when overwriting Graph List items. 2. Fix for Profile Graphs when flow direction changes along a path (steady state). 3. Fixed an issue where transient events were not importing from a Fathom XTS file. 4. Made a minor change to the behavior of the 'Global Search' when searching for text items. 5. Fixed an issue with EPANET import for computers with different Regional Settings. *** Changes for Version Date 2019.03.29 *** >> Changes to computation logic that could impact results << 1. None. >> Changes to data management that could impact results << 1. CRITICAL: Starting in the October 2018 releases, an additional field was added to the Control Valve data. This was placed in the wrong area and had the potential to corrupt the data that followed. This has been fixed. Models that were opened in the affected releases should have the data for the Control Valves rechecked. 2. Fixed an issue where User-Specified Four Quadrant pump curves could be erased upon re-opening of the Specify Four Quadrant Model form. >> Changes that do not impact results << 1. Fixed a problem with Duplicate Special when duplicating pumps. 2. Fixed an issue with the Pre-paste object when handling large areas on the Workspace. 3. Fixed an Issue where Multi-Condition events were not triggering. 4. Fixed an issue where Pump Curves, in some cases, could not be drawn in the Pump Properties window after copying an existing Pump junction. *** Changes for Version Date 2019.06.10 *** >> Changes to computation logic that could impact results << 1. Checking the Include Momentum box caused a momentum term to be included in the value calculated for Point forces which is only appropriate for differential force calculations where the moment term accounts for forces caused by changes in momentum. This has been corrected. 2. Using four quadrant pump data with viscosity corrections could cause an artificial transient. This was caused by four quadrant rated conditions not being properly updated with viscosity adjusted performance throughout the steady state solution. This is now resolved and working properly. >> Changes to data management that could impact results << 1. Fixed a problem that caused the power to not be displayed for a submerged positive displacement pump. This only affected the power reported in the Pump Summary. 2. Fixed a problem with graphing submerged pump junction transient values. 3. Force data for Point Forces was not being written to the output file, so Force/Time graphs for point forces were generated with values of zero for all forces. This has been corrected. 4. Selecting bulk modulus units that differed from the selected pressure units could cause REFPROP to convert the units twice and display the erroneous value. >> Changes that do not impact results << 1. Fixed alignment of Junctions and Pipes when copying/pasting/duplicating in Isometric. 2. Fixed an EPANet Import issue when valves have a 'setting' that is not numeric. 3. Fixed a bug with Transient Junction Graphs: When adding another junction of the same type the selected parameter resets. 4. Made improvements to zooming in the Workspace Overview Window. 5. Fixed an issue where Four Quadrant Graphs would not display correctly in the Pump Properties Form while Controlled Pump was selected. 6. Improved EPAnet import capabilities and issues with certain pipes failing to import. *** Changes for Version Date 2019.07.03 *** >> Changes to computation logic that could impact results << 1. Fixed a problem when graphing force data when there is an area change between the first pipe and last. The force due to the area change was accounted for twice which resulted in larger forces. The maximum force displayed in the output was correct. 2. When using the Gas Cavity Model, with branch junctions involving leg losses, the model may fail to initialize properly when starting a new run. This could cause an artificial transient immediately after a successful run. This has been resolved. >> Changes to data management that could impact results << 1. None. >> Changes that do not impact results << 1. None. *** Changes for Version Date 2019.07.11 *** >> Changes to computation logic that could impact results << 1. None. >> Changes to data management that could impact results << 1. When using REFPROP fluid data in system properties, changing the vapor pressure units to psig would cause an error. This has been resolved. >> Changes that do not impact results << 1. Minor Fixes to PCF Import. *** Changes for Version Date 2019.10.03 *** >> Changes to computation logic that could impact results << 1. Viscosity corrections and slurry derating corrections to pumps using an X-Y interpolated curve fit type presented incorrect output values for Overall Power, Overall Efficiency, and NPSHR. Pressure and flow results would also be affected if using a Multiple Configuration pump with X-Y interpolated curves. >> Changes to data management that could impact results << 1. Fixed a problem when graphing submerged pump and exit valve data if the HGL option was used. 2. Vacuum Breaker Volumetric Inflow has been removed as a graph parameter because the density will continuously change over the run making the volumetric value invalid. The mass inflow is still available and valid. 3. In special cases, when changing tabs from Graph Results to Workspace, a solver error would appear and persist. This has been resolved. >> Changes that do not impact results << 1. Fixed an inconvenience where two confirmation messages would be given if a junction was put on the Workspace and there were child scenarios with output. 2. Added new Output parameter for Resistance Total (which is pipe wall + components). 3. Changed Output parameter Resistance Hydraulic to Resistance Wall (which is just the wall friction) to better describe the parameter. 4. Fixed Print Preview to force expanding of collapsed grids in output. *** Changes for Version Date 2019.10.07 *** >> Changes to computation logic that could impact results << 1. None. >> Changes to data management that could impact results << 1. None. >> Changes that do not impact results << 1. PFA interface issue corrected. Pulsation control would incorrectly show "Transient Friction Model." *** Changes for Version Date 2019.12.12 *** >> Changes to computation logic that could impact results << 1. In some circumstances, a four quadrant pump curve with a Dimensional Reference Point at BEP will intersect the standard pump curve at multiple points. If the steady state operating point coincided with one of these points, the transient solution would always proceed with a four quadrant curve based on BEP, even if the user had selected to base the curve on the steady operating point. This has been corrected. >> Changes to data management that could impact results << 1. The Pulsation Frequency Analysis (PFA) module could incorrectly exclude the selection of higher-multiple harmonics and their corresponding pump speeds (RPM) during the initial frequency selection in certain situations. This has been fixed. >> Changes that do not impact results << 1. If a preferred unit was set as a default other than the application default, it would be overridden when the application was restarted. This was fixed. 2. The Visual Report window was not displaying user-selected colors for pipes correctly the first time it was loaded. This has been fixed. *** Changes for Version Date 2020.01.30 *** >> Changes to computation logic that could impact results << 1. None. >> Changes to data management that could impact results << 1. When using Kv (metric) loss type transient after control, the initial table entry was incorrectly selected on the basis of Cv and would start the transient at the wrong point in the transient table. This error has been resolved. 2. In the Pulsation Frequency Analysis (PFA) Module, evaluating a frequency for harmonics and correlating pump speed (RPM) could cause a program lock in a specific set of circumstances. This has been fixed. >> Changes that do not impact results << 1. The Excel Export Manager was not saving Settling Slurry (SSL) Module items. This has been fixed. 2. The Excel Export Manager was incorrectly calculating expected rows with multi- scenario output. This has been fixed.