Choose the base blend or product slate

The Base Blend page (called Product Slate in the Product Evaluation analytic) shows the group of crudes, feedstocks or products to which the analytic will add each of your Candidates in turn.

This page is available in the Crude Evaluation, Feedstock Evaluation and Product Evaluation analytics.

You can select and clear the check boxes in the Active column to include and exclude crudes, feedstocks or products from the analysis. The check boxes in the Candidate column show you whether each crude, feedstock or product is also part of the list of candidates.

For each item you can edit the Price and define Min, Max and Fixed constraints. You can also see the solution value for the item in the parent case, and any marginal values in case constraints were met.

Lock solutions during analysis

Solution values can be locked during subsequent runs. This means that a solution value will not change in any subsequent run, even if other input to the run is changed.

Example: The flow of naphtha from a crude could be locked, and in subsequent runs it would not be able to change. Therefore, if a fixed swing cut point was changed and the model re-run, the crude blend would have to change in order to match the fixed flow rate.

Locking a solution value acts in a similar way to fixing the value. The advantage over fixing a value is that the lock can be clearly seen in the user interface, so it is simpler to distinguish true fixed values from those which are temporarily locked.

To lock one or more solution values, select the corresponding rows in the table and do either of the following:

• Click Lock Solution in the Behaviour group of the Home ribbon tab.

• Right-click on the table and choose Locking > Lock from the context menu.

To unlock one or more solution values, select them and either click Unlock Solution in the ribbon or choose Locking > Unlock from the context menu.