<< Click to Display Table of Contents >> Navigation:  Wadiso 6 User Guide > Optimization > Editing of Optimization Data > Candidate Pipe Sizes for Groups

The candidate pipe sizes to be considered during optimization for each group of pipes are defined in the Optimization Data table, accessible by selecting Optimization Data > Candidate Pipe Sizes per Group.

There are 10 Pipe Size columns in the table, one each for the 10 groups which can be defined in the Pipe/CV table. In each column, the candidate sizes which should be considered for that group must be entered.

The sizes entered must be a subset of the sizes included in the pipe cost function data. Entering a 0 (zero) or E (for elimination) as a possible size will permit elimination of all pipes in the group as an alternative. Enter a C (for Cleaning) if cleaning and lining of the parallel pipe(s) instead of adding new parallel pipes is to be considered as an alternative.

In the case of cleaning as an option, all pipes in the group must have other pipes with different pipe numbers but the same beginning and ending nodes (i.e. parallel existing pipes), which can be considered for cleaning an are not to be sized. This can be explained by the following groups: Group 1 consists of pipes 221, 231 and 241. Existing pipes 21, 31 and 141 are parallel to the three previously listed pipes, respectively. Cleaning and lining of pipes 21, 31 and 141 is permissible. Therefore listing of C as a size option of group 1 is possible. Group 2 consist of pipes 222 and 233. There is no pipe parallel to 222 (i.e. no pipe has same beginning and ending nodes). For this group cleaning cannot be specified. An example of size assignments to group 1, which would permit elimination of the group as well as cleaning the existing pipes with the same beginning and ending nodes would be:

GP1

0

C

150

200

250

Within the size range specified, one does not need to list all sizes included in the cost data. For instance

GP4

150

200

250

would be a legitimate response to pipe sizes for Group 4, even though the cost data may include 200 and 300 mm pipe sizes as well. Rather than specifying all 5 sizes from 150 to 350 mm the user can specify sizes 150, 250 and 350 mm in a first run. If the program selects the 300 mm size the user then could re-run the optimization for sizes 250, 300 and 350 mm. Since computer time is roughly proportional to the product of the number of sizes in all groups this procedure may dramatically reduce computer time. But the procedure may not be totally equivalent to listing all five sizes in the first run.

At least one candidate size must be specified for each of the groups defined in the Group Table. A maximum number of 10 sizes are allowed for each group.

The Optimization Data table is in nature the same as the system data and results tables. The same special editing functions, sorting functions, customization possibilities and exporting facilities are accessibe throu the right-click menus (note some table menus have been removed, which are not relevant to this table).

(The lists of candidate sizes is considered optimization specific data, which is saved with other optimization data).