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Figure 4 Defect Grouping (Clustering) Example<br />

Figure 5 shows a typical defect cluster. Individual defects are identified by blue ovals, <strong>the</strong>re<br />

are many defects close toge<strong>the</strong>r, <strong>the</strong>se have been grouped, <strong>and</strong> <strong>the</strong> group is identified by <strong>the</strong><br />

orange rectangle, which defines <strong>the</strong> defect reported in <strong>the</strong> final defect listing. Therefore, a<br />

defect that is listed in an inspection report could be a single defect, or could be cluster of<br />

numerous real defects, as shown in Figure 5.<br />

Page 4 of 13<br />

Copyright © 2007, <strong>Pigging</strong> <strong>Products</strong> <strong>and</strong> <strong>Services</strong> <strong>Association</strong>.

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