It’s been some time since I updated the OLI Blog. We have spent the last several weeks updating the software. We are not yet done but there was a need to release version 3.0.8 for a course in Japan. We will have an updated database series in the very near future which will force the need for yet another build.
We rushed to release Analyzers 3.0.7…Version 3.0.8 to be born!
We rushed to release Analyzers 3.0.7 to a customer and we inadvertently let a few bugs slip through. Check the release notes for more information. Here is a brief list of the changes we have made for the next version:
- Sometime when entering Assay data for an oil, the data data mysteriously vanished. We found that we had a bug in data entry code for the flow of the assay. If you started with a flow then entered data you were ok, if you entered the data and then changed the flow the data went missing. We have corrected this odd bug.
- The name of the petroleum assay is now limited to 5 characters and no trailing “_” are allowed. This is because we append the temperature of the resulting pseudocomponent to the name and this could exceed the maximum name length.
- Cascading mixers were broken. We fixed the logic necessary to keep track of which upstream object had been calculated. Some files crashed when opened if they had cascading mixers. This was also fixed.
- We had some problems with the formula names for allows (like stainless steel 304) appearing on Pourbaix diagrams. We updated the routines for building the internal chemistry model and forgot to include a line in the model. This has been fixed.
- Some menu items like adding a Water Analysis were removed for version 3.0. In 3.0.8 they have been restored.
- There is known issue of page loads for Chemical Diagrams. We increased the number of species considered and this dramatically increase the time a page takes to load. Be patient, the page will load. We will address this issue in a later release.
Aspen PLUS – OLI Getting Started
I have created a new page on the OLI Support website that provides an overview of Aspen PLUS and OLI. Here is the link: Getting Started with Aspen PLUS OLI As time progresses I will be adding more to this site such as how to work with petroleum fractions and other tips which are worth mentioning.
A second tutorial for Aspen PLUS and OLI was created. This is for using multiple models in Aspen PLUS with OLI.
Aspen PLUS 2006.5 Update
At the request of a user we updated the data in the Mixed Solvent Electrolyte public database to a more current (although not the most current) version. The version we updated it to was equivalent to ESP 8.0.60. The reason we did not update it fully is that we made some changed to the density interactions (see below) that are not part of the Aspen PLUS OLI 2006.5 solvers. Use of that newer data could lead to unexpected and unintended results.
The link for the updated database is on the OLI support website/Patches and Updates
Changes to MSE Density interactions
Peiming Wang of OLI has created new density interaction routines that improve the density predictions in the OLI Mixed Solvent Electrolyte model. This change was effective in version 8.1.4 of the ESP code (which corresponds to 3.0.4 of the Analyzers). We actually did a bad thing here… we used the exact same parameters slots in the database for the new routines as we did for the old routines. This means it’s easy to upgrade from models generated with older versions of the program. Unfortunately if a user creates (or OLI creates) a database with the newer version and send it to user running the older version, unexpected density calculations can result. This really only affects users of the alliance products such as Aspen, Hysys or ProII which typically lag behind in development cycle.
Till next time.