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Significant Pipeline Incidents By Cause

This report is a sub-report of the PHMSA Significant Pipeline Incidents report. As such, it represents Significant Incidents (A) only over the time period and pipeline system specified.

The data source for this table is the PHMSA Flagged Incident File. (1)

More Pipeline Incidents Reports are available.

National All Pipeline Systems: Significant Incident Details: 2006
Reported Cause of Incident (B) Number (C) % Fatalities Injuries Property Damage (D) (E) % of Property Damage
CORROSION
EXTERNAL CORROSION 23 8.9% 1 3 $16,195,455 10.6%
INTERNAL CORROSION 32 12.4% 0 0 $17,179,594 11.3%
Sub Total 55 21.4% 1 3 $33,375,050 22.0%
EXCAVATION DAMAGE
OPERATOR/CONTRACTOR EXCAVATION DAMAGE 6 2.3% 0 1 $615,101 0.4%
THIRD PARTY EXCAVATION DAMAGE 37 14.4% 8 13 $13,211,429 8.7%
Sub Total 43 16.7% 8 14 $13,826,531 9.1%
INCORRECT OPERATION
UNSPECIFIED INCORRECT OPERATION 13 5.0% 0 3 $1,720,463 1.1%
Sub Total 13 5.0% 0 3 $1,720,463 1.1%
MAT'L/WELD/EQUIP FAILURE
ENVIRONMENTAL CRACKING-RELATED 1 0.3% 0 0 $359,502 0.2%
BODY OF PIPE 3 1.1% 0 0 $486,812 0.3%
PIPE SEAM 8 3.1% 0 0 $15,652,129 10.3%
BUTT WELD 10 3.8% 0 0 $2,577,559 1.7%
FILLET WELD 4 1.5% 0 0 $1,353,895 0.8%
JOINT/FITTING/COMPONENT 13 5.0% 0 1 $4,326,643 2.8%
MALFUNCTION OF CONTROL/RELIEF EQUIPMENT 6 2.3% 0 0 $742,136 0.4%
THREADED CONNECTION/COUPLING FAILURE 9 3.5% 0 0 $704,774 0.4%
NON-THREADED CONNECTION FAILURE 9 3.5% 0 0 $15,470,032 10.2%
Sub Total 63 24.5% 0 1 $41,673,486 27.5%
NATURAL FORCE DAMAGE
EARTH MOVEMENT 1 0.3% 0 0 $342,072 0.2%
HEAVY RAINS/FLOODS 5 1.9% 0 0 $14,404,938 9.5%
LIGHTNING 5 1.9% 4 1 $6,950,757 4.5%
HIGH WINDS 1 0.3% 0 0 $99,383 0.0%
Sub Total 12 4.6% 4 1 $21,797,151 14.3%
OTHER OUTSIDE FORCE DAMAGE
FIRE/EXPLOSION AS PRIMARY CAUSE 2 0.7% 0 0 $180,954 0.1%
VEHICLE NOT ENGAGED IN EXCAVATION 19 7.3% 3 4 $10,313,208 6.8%
PREVIOUS MECHANICAL DAMAGE 5 1.9% 0 0 $10,702,381 7.0%
INTENTIONAL DAMAGE 1 0.3% 0 0 $45,238 0.0%
Sub Total 27 10.5% 3 4 $21,241,783 14.0%
ALL OTHER CAUSES
MISCELLANEOUS CAUSE 27 10.5% 0 6 $12,226,117 8.0%
UNKNOWN CAUSE 17 6.6% 3 2 $5,666,768 3.7%
Sub Total 44 17.1% 3 8 $17,892,885 11.8%
Totals 257 100.0% 19 34 $151,527,351 100.0%
National, All Pipeline Systems, 2006
National Hazardous Liquid: Significant Incident Details: 2006
Reported Cause of Incident (B) Number % Fatalities Injuries Property Damage (D) (E) % of Property Damage
CORROSION
EXTERNAL CORROSION 14 13.0% 0 2 $14,234,939 17.5%
INTERNAL CORROSION 18 16.8% 0 0 $6,222,843 7.6%
Sub Total 32 29.9% 0 2 $20,457,783 25.1%
EXCAVATION DAMAGE
OPERATOR/CONTRACTOR EXCAVATION DAMAGE 3 2.8% 0 0 $425,864 0.5%
THIRD PARTY EXCAVATION DAMAGE 10 9.3% 0 0 $3,830,866 4.7%
Sub Total 13 12.1% 0 0 $4,256,731 5.2%
INCORRECT OPERATION
UNSPECIFIED INCORRECT OPERATION 8 7.4% 0 0 $364,997 0.4%
Sub Total 8 7.4% 0 0 $364,997 0.4%
MAT'L/WELD/EQUIP FAILURE
BODY OF PIPE 1 0.9% 0 0 $220,583 0.2%
PIPE SEAM 5 4.6% 0 0 $14,903,339 18.3%
BUTT WELD 3 2.8% 0 0 $884,517 1.0%
FILLET WELD 4 3.7% 0 0 $1,353,895 1.6%
JOINT/FITTING/COMPONENT 3 2.8% 0 0 $677,333 0.8%
MALFUNCTION OF CONTROL/RELIEF EQUIPMENT 4 3.7% 0 0 $406,934 0.5%
THREADED CONNECTION/COUPLING FAILURE 7 6.5% 0 0 $252,388 0.3%
NON-THREADED CONNECTION FAILURE 5 4.6% 0 0 $2,344,056 2.8%
Sub Total 32 29.9% 0 0 $21,043,049 25.8%
NATURAL FORCE DAMAGE
HEAVY RAINS/FLOODS 2 1.8% 0 0 $11,910,821 14.6%
LIGHTNING 3 2.8% 0 0 $6,769,802 8.3%
Sub Total 5 4.6% 0 0 $18,680,624 22.9%
OTHER OUTSIDE FORCE DAMAGE
FIRE/EXPLOSION AS PRIMARY CAUSE 1 0.9% 0 0 $11,309 0.0%
VEHICLE NOT ENGAGED IN EXCAVATION 2 1.8% 0 0 $6,916,261 8.5%
PREVIOUS MECHANICAL DAMAGE 2 1.8% 0 0 $7,384,658 9.0%
INTENTIONAL DAMAGE 1 0.9% 0 0 $45,238 0.0%
Sub Total 6 5.6% 0 0 $14,357,468 17.6%
ALL OTHER CAUSES
MISCELLANEOUS CAUSE 10 9.3% 0 0 $1,514,334 1.8%
UNKNOWN CAUSE 1 0.9% 0 0 $681,971 0.8%
Sub Total 11 10.2% 0 0 $2,196,306 2.7%
Totals 107 100.0% 0 2 $81,356,960 100.0%
National, Hazardous Liquid, 2006
National Hazardous Liquid Onshore: Significant Incident Details: 2006
Reported Cause of Incident (B) Number % Fatalities Injuries Property Damage (D) (E) % of Property Damage
CORROSION
EXTERNAL CORROSION 14 13.0% 0 2 $14,234,939 17.5%
INTERNAL CORROSION 18 16.8% 0 0 $6,222,843 7.6%
Sub Total 32 29.9% 0 2 $20,457,783 25.1%
EXCAVATION DAMAGE
OPERATOR/CONTRACTOR EXCAVATION DAMAGE 3 2.8% 0 0 $425,864 0.5%
THIRD PARTY EXCAVATION DAMAGE 10 9.3% 0 0 $3,830,866 4.7%
Sub Total 13 12.1% 0 0 $4,256,731 5.2%
INCORRECT OPERATION
UNSPECIFIED INCORRECT OPERATION 8 7.4% 0 0 $364,997 0.4%
Sub Total 8 7.4% 0 0 $364,997 0.4%
MAT'L/WELD/EQUIP FAILURE
BODY OF PIPE 1 0.9% 0 0 $220,583 0.2%
PIPE SEAM 5 4.6% 0 0 $14,903,339 18.3%
BUTT WELD 3 2.8% 0 0 $884,517 1.0%
FILLET WELD 4 3.7% 0 0 $1,353,895 1.6%
JOINT/FITTING/COMPONENT 3 2.8% 0 0 $677,333 0.8%
MALFUNCTION OF CONTROL/RELIEF EQUIPMENT 4 3.7% 0 0 $406,934 0.5%
THREADED CONNECTION/COUPLING FAILURE 7 6.5% 0 0 $252,388 0.3%
NON-THREADED CONNECTION FAILURE 5 4.6% 0 0 $2,344,056 2.8%
Sub Total 32 29.9% 0 0 $21,043,049 25.8%
NATURAL FORCE DAMAGE
HEAVY RAINS/FLOODS 1 0.9% 0 0 $1,166,590 1.4%
LIGHTNING 3 2.8% 0 0 $6,769,802 8.3%
Sub Total 4 3.7% 0 0 $7,936,392 9.7%
OTHER OUTSIDE FORCE DAMAGE
FIRE/EXPLOSION AS PRIMARY CAUSE 1 0.9% 0 0 $11,309 0.0%
VEHICLE NOT ENGAGED IN EXCAVATION 1 0.9% 0 0 $802,984 0.9%
PREVIOUS MECHANICAL DAMAGE 2 1.8% 0 0 $7,384,658 9.0%
INTENTIONAL DAMAGE 1 0.9% 0 0 $45,238 0.0%
Sub Total 5 4.6% 0 0 $8,244,191 10.1%
ALL OTHER CAUSES
MISCELLANEOUS CAUSE 10 9.3% 0 0 $1,514,334 1.8%
Sub Total 10 9.3% 0 0 $1,514,334 1.8%
Totals 104 97.2% 0 2 $63,817,480 78.4%
National, Hazardous Liquid Onshore, 2006
National Hazardous Liquid Offshore: Significant Incident Details: 2006
Reported Cause of Incident (B) Number % Fatalities Injuries Property Damage (D) (E) % of Property Damage
NATURAL FORCE DAMAGE
HEAVY RAINS/FLOODS 1 0.9% 0 0 $10,744,231 13.2%
Sub Total 1 0.9% 0 0 $10,744,231 13.2%
OTHER OUTSIDE FORCE DAMAGE
VEHICLE NOT ENGAGED IN EXCAVATION 1 0.9% 0 0 $6,113,276 7.5%
Sub Total 1 0.9% 0 0 $6,113,276 7.5%
ALL OTHER CAUSES
UNKNOWN CAUSE 1 0.9% 0 0 $681,971 0.8%
Sub Total 1 0.9% 0 0 $681,971 0.8%
Totals 3 2.8% 0 0 $17,539,480 21.5%
National, Hazardous Liquid Offshore, 2006
National Gas Transmission: Significant Incident Details: 2006
Reported Cause of Incident (B) Number % Fatalities Injuries Property Damage (D) (E) % of Property Damage
CORROSION
EXTERNAL CORROSION 6 7.6% 0 0 $1,767,803 4.5%
INTERNAL CORROSION 8 10.2% 0 0 $3,064,525 7.8%
Sub Total 14 17.9% 0 0 $4,832,329 12.3%
EXCAVATION DAMAGE
OPERATOR/CONTRACTOR EXCAVATION DAMAGE 2 2.5% 0 0 $188,259 0.4%
THIRD PARTY EXCAVATION DAMAGE 7 8.9% 3 0 $2,621,487 6.7%
Sub Total 9 11.5% 3 0 $2,809,747 7.2%
INCORRECT OPERATION
UNSPECIFIED INCORRECT OPERATION 3 3.8% 0 1 $223,828 0.5%
Sub Total 3 3.8% 0 1 $223,828 0.5%
MAT'L/WELD/EQUIP FAILURE
ENVIRONMENTAL CRACKING-RELATED 1 1.2% 0 0 $359,502 0.9%
BODY OF PIPE 2 2.5% 0 0 $266,228 0.6%
PIPE SEAM 3 3.8% 0 0 $748,790 1.9%
BUTT WELD 7 8.9% 0 0 $1,693,042 4.3%
JOINT/FITTING/COMPONENT 8 10.2% 0 0 $3,480,734 8.9%
MALFUNCTION OF CONTROL/RELIEF EQUIPMENT 2 2.5% 0 0 $335,201 0.8%
THREADED CONNECTION/COUPLING FAILURE 1 1.2% 0 0 $282,741 0.7%
NON-THREADED CONNECTION FAILURE 4 5.1% 0 0 $13,125,975 33.6%
Sub Total 28 35.9% 0 0 $20,292,216 52.0%
NATURAL FORCE DAMAGE
EARTH MOVEMENT 1 1.2% 0 0 $342,072 0.8%
LIGHTNING 1 1.2% 0 0 $180,954 0.4%
Sub Total 2 2.5% 0 0 $523,026 1.3%
OTHER OUTSIDE FORCE DAMAGE
FIRE/EXPLOSION AS PRIMARY CAUSE 1 1.2% 0 0 $169,644 0.4%
VEHICLE NOT ENGAGED IN EXCAVATION 5 6.4% 0 1 $590,250 1.5%
PREVIOUS MECHANICAL DAMAGE 1 1.2% 0 0 $434,048 1.1%
Sub Total 7 8.9% 0 1 $1,193,943 3.0%
ALL OTHER CAUSES
MISCELLANEOUS CAUSE 10 12.8% 0 0 $6,574,508 16.8%
UNKNOWN CAUSE 5 6.4% 0 1 $2,560,458 6.5%
Sub Total 15 19.2% 0 1 $9,134,967 23.4%
Totals 78 100.0% 3 3 $39,010,059 100.0%
National, Gas Transmission, 2006
National Gas Transmission Onshore: Significant Incident Details: 2006
Reported Cause of Incident (B) Number % Fatalities Injuries Property Damage (D) (E) % of Property Damage
CORROSION
EXTERNAL CORROSION 6 7.6% 0 0 $1,767,803 4.5%
INTERNAL CORROSION 4 5.1% 0 0 $1,779,927 4.5%
Sub Total 10 12.8% 0 0 $3,547,730 9.0%
EXCAVATION DAMAGE
OPERATOR/CONTRACTOR EXCAVATION DAMAGE 2 2.5% 0 0 $188,259 0.4%
THIRD PARTY EXCAVATION DAMAGE 7 8.9% 3 0 $2,621,487 6.7%
Sub Total 9 11.5% 3 0 $2,809,747 7.2%
INCORRECT OPERATION
UNSPECIFIED INCORRECT OPERATION 3 3.8% 0 1 $223,828 0.5%
Sub Total 3 3.8% 0 1 $223,828 0.5%
MAT'L/WELD/EQUIP FAILURE
ENVIRONMENTAL CRACKING-RELATED 1 1.2% 0 0 $359,502 0.9%
BODY OF PIPE 2 2.5% 0 0 $266,228 0.6%
PIPE SEAM 3 3.8% 0 0 $748,790 1.9%
BUTT WELD 6 7.6% 0 0 $1,461,355 3.7%
JOINT/FITTING/COMPONENT 4 5.1% 0 0 $761,495 1.9%
MALFUNCTION OF CONTROL/RELIEF EQUIPMENT 2 2.5% 0 0 $335,201 0.8%
NON-THREADED CONNECTION FAILURE 4 5.1% 0 0 $13,125,975 33.6%
Sub Total 22 28.2% 0 0 $17,058,550 43.7%
NATURAL FORCE DAMAGE
EARTH MOVEMENT 1 1.2% 0 0 $342,072 0.8%
LIGHTNING 1 1.2% 0 0 $180,954 0.4%
Sub Total 2 2.5% 0 0 $523,026 1.3%
OTHER OUTSIDE FORCE DAMAGE
FIRE/EXPLOSION AS PRIMARY CAUSE 1 1.2% 0 0 $169,644 0.4%
VEHICLE NOT ENGAGED IN EXCAVATION 3 3.8% 0 1 $239,867 0.6%
PREVIOUS MECHANICAL DAMAGE 1 1.2% 0 0 $434,048 1.1%
Sub Total 5 6.4% 0 1 $843,560 2.1%
ALL OTHER CAUSES
MISCELLANEOUS CAUSE 5 6.4% 0 0 $1,259,227 3.2%
UNKNOWN CAUSE 3 3.8% 0 1 $2,182,714 5.6%
Sub Total 8 10.2% 0 1 $3,441,941 8.8%
Totals 59 75.6% 3 3 $28,448,386 72.9%
National, Gas Transmission Onshore, 2006
National Gas Transmission Offshore: Significant Incident Details: 2006
Reported Cause of Incident (B) Number % Fatalities Injuries Property Damage (D) (E) % of Property Damage
CORROSION
INTERNAL CORROSION 4 5.1% 0 0 $1,284,598 3.2%
Sub Total 4 5.1% 0 0 $1,284,598 3.2%
MAT'L/WELD/EQUIP FAILURE
BUTT WELD 1 1.2% 0 0 $231,686 0.5%
JOINT/FITTING/COMPONENT 4 5.1% 0 0 $2,719,238 6.9%
THREADED CONNECTION/COUPLING FAILURE 1 1.2% 0 0 $282,741 0.7%
Sub Total 6 7.6% 0 0 $3,233,666 8.2%
OTHER OUTSIDE FORCE DAMAGE
VEHICLE NOT ENGAGED IN EXCAVATION 2 2.5% 0 0 $350,382 0.9%
Sub Total 2 2.5% 0 0 $350,382 0.9%
ALL OTHER CAUSES
MISCELLANEOUS CAUSE 5 6.4% 0 0 $5,315,280 13.6%
UNKNOWN CAUSE 2 2.5% 0 0 $377,744 0.9%
Sub Total 7 8.9% 0 0 $5,693,025 14.5%
Totals 19 24.3% 0 0 $10,561,673 27.0%
National, Gas Transmission Offshore, 2006
National Gas Gathering: Significant Incident Details: 2006
Reported Cause of Incident (B) Number % Fatalities Injuries Property Damage (D) (E) % of Property Damage
CORROSION
INTERNAL CORROSION 6 50.0% 0 0 $7,892,225 65.1%
Sub Total 6 50.0% 0 0 $7,892,225 65.1%
MAT'L/WELD/EQUIP FAILURE
JOINT/FITTING/COMPONENT 2 16.6% 0 1 $168,575 1.3%
THREADED CONNECTION/COUPLING FAILURE 1 8.3% 0 0 $169,644 1.4%
Sub Total 3 25.0% 0 1 $338,219 2.7%
OTHER OUTSIDE FORCE DAMAGE
PREVIOUS MECHANICAL DAMAGE 1 8.3% 0 0 $1,861,255 15.3%
Sub Total 1 8.3% 0 0 $1,861,255 15.3%
ALL OTHER CAUSES
MISCELLANEOUS CAUSE 1 8.3% 0 0 $1,696,446 14.0%
UNKNOWN CAUSE 1 8.3% 0 0 $333,473 2.7%
Sub Total 2 16.6% 0 0 $2,029,920 16.7%
Totals 12 100.0% 0 1 $12,121,620 100.0%
National, Gas Gathering, 2006
National Gas Distribution: Significant Incident Details: 2006
Reported Cause of Incident (B) Number (C) % Fatalities Injuries Property Damage (D) (E) % of Property Damage
CORROSION
EXTERNAL CORROSION 3 5.0% 1 1 $192,713 1.0%
Sub Total 3 5.0% 1 1 $192,713 1.0%
EXCAVATION DAMAGE
OPERATOR/CONTRACTOR EXCAVATION DAMAGE 1 1.6% 0 1 $977 0.0%
THIRD PARTY EXCAVATION DAMAGE 20 33.3% 5 13 $6,759,074 35.5%
Sub Total 21 35.0% 5 14 $6,760,051 35.5%
INCORRECT OPERATION
UNSPECIFIED INCORRECT OPERATION 2 3.3% 0 2 $1,131,637 5.9%
Sub Total 2 3.3% 0 2 $1,131,637 5.9%
NATURAL FORCE DAMAGE
HEAVY RAINS/FLOODS 3 5.0% 0 0 $2,494,116 13.1%
LIGHTNING 1 1.6% 4 1 $0 0.0%
HIGH WINDS 1 1.6% 0 0 $99,383 0.5%
Sub Total 5 8.3% 4 1 $2,593,500 13.6%
OTHER OUTSIDE FORCE DAMAGE
VEHICLE NOT ENGAGED IN EXCAVATION 12 20.0% 3 3 $2,806,696 14.7%
PREVIOUS MECHANICAL DAMAGE 1 1.6% 0 0 $1,022,419 5.3%
Sub Total 13 21.6% 3 3 $3,829,116 20.1%
ALL OTHER CAUSES
MISCELLANEOUS CAUSE 6 10.0% 0 6 $2,440,827 12.8%
UNKNOWN CAUSE 10 16.6% 3 1 $2,090,864 10.9%
Sub Total 16 26.6% 3 7 $4,531,692 23.8%
Totals 60 100.0% 16 28 $19,038,710 100.0%
National, Gas Distribution, 2006

Notes

  1. Significant Incidents are those incidents reported by pipeline operators when any of the following conditions are met: 1) Fatality or injury requiring in-patient hospitalization. 2) $50,000 or more in total costs, measured in 1984 dollars. 3) Highly volatile liquid releases of 5 barrels or more or other liquid releases of 50 barrels or more. 4) Liquid releases resulting in an unintentional fire or explosion. Serious incidents, a subset of Significant Incidents, are incidents which involve a fatality or injury requiring in-patient hospitalization.
  2. PHMSA has gathered increasingly targeted incident cause data over time. As such, the available reportable categories of cause (eg: Internal/External Corrosion vs Corrosion in general) have increased over time. This report spans time periods over which the reportable cause categories have changed. The cause categories in this report should be taken as general and not specific for years prior to 2002 for Liquid and Gas Transmission, and prior to 2004 for Gas Distribution.
  3. Gas Distribution incidents where fire/explosion was the primary cause of failure, such as a house fire that subsequently resulted in - but was not caused by - a distribution line failure are excluded from 2004 onward. This exclusion has not been applied in years prior to 2004 due to difficulty in identifying these types of events with the older report formats.
  4. The costs for incidents in 2013 and prior are presented in 2013 dollars. Cost of Gas lost is indexed via the Energy Information Administration, Natural Gas City Gate Prices. All other costs are adjusted via the Bureau of Economic Analysis, Government Printing Office inflation values.
  5. For years 2002 and later, property damage is estimated as the sum of all public and private costs reported in the 30-day incident report. For years prior to 2002, accident report forms did not include a breakdown of public and private costs so property damage for these years is the reported total property damage field in the report.

Sources

  1. PHMSA Flagged Incidents File - Aug 4, 2014. Note: Incidents occurring up to 30 days prior the Incident File source date may not appear in these reports due to the 30-day reporting period allowed by PHMSA regulation.

See Pipeline Incidents Reports for more pipeline safety reports.

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