• Mill gear

An example of a thickness mapping is shown below. The color code varies from light blue (thinnest wall) to dark red (thickest wall). The range of actual thickness measurements is indicated for each scan. In the example here, the color palette varies from 30mm (light blue) to 70mm (red) thickness.

Therefore, the area in the mapping below consists of an affected of about 50% wall loss. Three values are above the thickness map:

  • CVolMean is the thickness average over the scanned area
  • CVolMax is the maximum thickness in the scan
  • CVolMin is the minimum thickness in the scan

The red crosshair points to the location of the minimum thickness.

The vertical axis in the map corresponds to the axial location on the shell (in all scans, each map represents an approximate 3inches wide thickness band).

The horizontal axis in the map corresponds to the circumferential location on the shell (in this case, 2 500mm were inspected in one scan).

In the example below, a vertical thinner location profile (blue area on the map) indicates the analyst that an axial erosion/corrosion pattern affects the mill at that location.

Gray areas correspond to an area where signal was not captured by the instrument or an area where no data was collected.

Figure2 Example of thickness mapFigure 2: Example of thickness map

 

Sample Average Shell Thickness Map

Sample Average Shell Thickness Map

Mill Shell Thickness Mapping