The Target Structure P/S field is a system-generated field available in the CPDM Test Point Inspection grid. The field is gray to indicate its contents are system-generated. Target Structure P/S is used by PCS Axis to calculate a target reading with a minimum pipe-to-soil (P/S) for meeting criteria. The target reading is calculated based on your selected protection criterion and information in other fields (Table 7-1).
The default setting for Target Structure P/S is -0.850. To change the setting, follow these steps:
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Click the Select ROWs button
 to open the Select ROWs window (Figure 7-4). Select one or more pipeline segments with facilities you want to work with, then click  Save to close the window. |
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Open the Test Point Information grid. Click the Information tab
 and then the Test Point button  (Figure 7-104). |
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If you want to collapse the Selected ROWs panel to view more of the grid, click the Selected ROWs bar. Clicking the bar again expands the panel.
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Select the field Test Point Protection Criteria for a test point in the grid. Click the down arrow and select a protection criterion in the selection list. Repeat this step for other test points as needed.
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Figure 7-104. Test Point Information Grid
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Set up other fields used to calculate Target Structure P/S according to the information in the next table (Table 7-1). Based on how your data entry grids are arranged, fields may be in the Test Point Information or Inspection grid.
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The following table describes how Target Structure P/S is calculated for each protection criterion. Each protection criterion identifies fields required for calculating Target Structure P/S. Equations with pipe brackets ( | ) represent absolute values (Table 7-1).
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Example: –0.850 – | –1.200 – –0.800 | = –1.250
Note: The value in the field User IR Correction (if any) is used instead of the | Structure P/S – Structure IRF | equation.
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Example: –0.550 – 0.100 – | –1.200 – –0.800 | = –1.050
Note: The fields Native P/S and Native Date can be included with any survey regardless of how old. PCS Axis always finds the most recent native reading and date, and the most recent pair of structure “on/off” readings (Structure P/S and Structure IRF). This means if the current-year survey includes only “on” readings, PCS Axis uses the last “on/off” reading and native date. This is the case until a new “on/off” reading is taken.
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