Run Telluric Compensation in ISM

Running telluric compensation takes place in the Telluric workspace of the Edit ISM Data grid. After receiving field computer or mobile device survey files and importing and evaluating SDL survey files, use the information in this section to run telluric compensation for inspections in a close interval (CI) survey that include telluric effects and require compensation.

These instructions start with the assumption that the correct pipeline segments have been selected. For information detailing how to select pipeline segments, refer to Select ROWs.

Complete the following steps to run telluric compensation in the ISM module:

1. Click Data Entry > Edit ISM Data and then the CIS tab to open the CIS data grid in Edit ISM Data.

2. Select a survey folder with CI inspections that you want to run compensation from the Selected Continuous Surveydrop-down list.

   

   Edit ISM Data

3. Click the Telluric tab to open the Telluric workspace.

   

   Telluric Workspace

   A list of stationary data logger (SDL) survey files related to the selected pipeline segment and CI survey display in the Stationary Surveys group box of the Telluric workspace.

4. If you want to view a telluric summary of an SDL survey listed in the Stationary Surveys group box, click the Info link to open the Stationary Telluric Info window. For a description of this window, refer to View Telluric Summary Information.

5. If you want to view voltage measurements associated with an SDL survey listed in the Stationary Surveys group box, click the Edit link to open the Stationary Survey Maintenance window. A description of this window is available in Stationary Survey Maintenance.

6. To run telluric compensation, follow these steps:

   1. Select the SDL upstream/downstream data set pair to use in the compensation run. Click the check box associated with the upstream and downstream SDL survey files.

   2. Click Run to begin the compensation process and open the Compensation Results window.

      

      Compensation Results

   3. If an error occurs during the compensation run, a warning icon displays in the Compensation Results window. A description of the error and how to resolve it also display.

   4. When the compensation process completes, click Preview to view a graph of compensation results.

      

      Compensation Run Preview

   5. To view more details in the graph, move your mouse over the graph.

      

      View Additional Data on Graph

   6. When you finish viewing the graph, click the close button to close the graph and return to the Compensation Results window.

   7. If you want to apply compensation results to the PCS database, click Save in the Compensation Results window.

   8. Click Cancel to cancels the compensation process. PCS closes the window and returns to the Telluric workspace. Compensation results are not applied to the PCS database.