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Table 3
U.S. Liquid Pipeline Accidents by Cause: 1995–2000

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Cause 1995 1996 1997 1998 1999 2000 Average
1995–2000 Percent
Corrosion, external 23 39 33 19 24 21 27 16
Corrosion, internal 13 21 16 20 11 11 15 9
Corrosion, not specified 0 0 1 1 1 1 1 0.4
Failed pipe 14 10 11 7 3 7 9 5
Failed weld 9 9 3 6 14 10 9 5
Incorrect operation by operator personnel 26 11 11 7 16 9 13 8
Malfunction of control or relief equipment 5 6 7 9 7 5 7 4
Other 45 49 49 42 63 46 49 29
Damage by outside force 53 48 40 42 29 36 41 24
Total 188 193 171 153 168 146 170 100

SOURCE: U.S. Department of Transportation, Research and Special Programs Administration, Office of Pipeline Safety, from Form RSPA F-7100.2, available at http://ops.dot.gov/stats.htm, as of Oct. 1, 2001. 

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