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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 and Mileage Reports are available.

National All Pipeline Systems: Significant Incident Details: 2011
Reported Cause of Incident (B) Number (C) % Fatalities Injuries Property Damage (D) (E) % of Property Damage
CORROSION
EXTERNAL CORROSION 24 8.3% 1 2 $24,823,392 6.5%
INTERNAL CORROSION 41 14.2% 0 0 $34,755,623 9.1%
Sub Total 65 22.6% 1 2 $59,579,016 15.7%
EXCAVATION DAMAGE
OPERATOR/CONTRACTOR EXCAVATION DAMAGE 5 1.7% 0 6 $1,339,294 0.3%
THIRD PARTY EXCAVATION DAMAGE 34 11.8% 2 10 $25,222,419 6.6%
PREVIOUS DAMAGE DUE TO EXCAVATION 4 1.3% 0 0 $5,310,601 1.4%
Sub Total 43 14.9% 2 16 $31,872,315 8.4%
INCORRECT OPERATION
DAMAGE BY OPERATOR OR OPERATOR'S CONTRACTOR 2 0.7% 0 0 $285,091 0.0%
OVERFILL/OVERFLOW OF TANK/VESSEL/SUMP 4 1.3% 0 0 $366,192 0.1%
INCORRECT VALVE POSITION 3 1.0% 0 0 $1,501,140 0.4%
PIPELINE/EQUIPMENT OVERPRESSURED 1 0.3% 0 0 $79,813 0.0%
INCORRECT INSTALLATION 2 0.7% 0 0 $939,241 0.2%
OTHER INCORRECT OPERATION 10 3.4% 0 4 $9,409,750 2.4%
Sub Total 22 7.6% 0 4 $12,581,229 3.3%
MAT'L/WELD/EQUIP FAILURE
CONSTRUCTION, INSTALLATION OR FABRICATION-RELATED 18 6.2% 0 0 $15,542,502 4.1%
MANUFACTURING-RELATED 10 3.4% 0 0 $5,156,771 1.3%
ENVIRONMENTAL CRACKING-RELATED 2 0.7% 0 0 $532,639 0.1%
BODY OF PIPE 2 0.7% 1 7 $546,632 0.1%
MECHANICAL FITTING 2 0.7% 0 0 $1,363,703 0.3%
MALFUNCTION OF CONTROL/RELIEF EQUIPMENT 13 4.5% 0 1 $34,170,036 9.0%
VALVE 1 0.3% 0 0 $137,806 0.0%
PUMP/COMPRESSOR-RELATED EQUIPMENT 11 3.8% 0 0 $1,032,816 0.2%
THREADED CONNECTION/COUPLING FAILURE 12 4.1% 0 0 $7,937,166 2.1%
NON-THREADED CONNECTION FAILURE 10 3.4% 0 0 $25,408,130 6.7%
DEFECTIVE OR LOOSE TUBING/FITTING 1 0.3% 0 0 $237,106 0.0%
FAILURE OF EQUIPMENT BODY 2 0.7% 0 0 $714,496 0.1%
OTHER EQUIPMENT FAILURE 8 2.7% 1 1 $1,786,801 0.4%
Sub Total 92 32.0% 2 9 $94,566,612 25.0%
NATURAL FORCE DAMAGE
EARTH MOVEMENT 4 1.3% 0 0 $4,806,194 1.2%
HEAVY RAINS/FLOODS 8 2.7% 0 0 $151,091,212 39.9%
LIGHTNING 2 0.7% 0 0 $191,934 0.0%
TEMPERATURE 2 0.7% 0 0 $391,828 0.1%
HIGH WINDS 2 0.7% 0 0 $1,374,329 0.3%
OTHER NATURAL FORCE DAMAGE 2 0.7% 0 0 $2,090,923 0.5%
Sub Total 20 6.9% 0 0 $159,946,421 42.2%
OTHER OUTSIDE FORCE DAMAGE
FIRE/EXPLOSION AS PRIMARY CAUSE 1 0.3% 0 0 $12,652 0.0%
VEHICLE NOT ENGAGED IN EXCAVATION 6 2.0% 1 4 $427,800 0.1%
FISHING OR MARITIME ACTIVITY 4 1.3% 0 0 $2,082,851 0.5%
ELECTRICAL ARCING FROM OTHER EQUIPMENT/FACILITY 3 1.0% 0 2 $1,446,962 0.3%
PREVIOUS MECHANICAL DAMAGE 1 0.3% 0 0 $120,235 0.0%
OTHER OUTSIDE FORCE DAMAGE 7 2.4% 0 1 $2,063,285 0.5%
Sub Total 22 7.6% 1 7 $6,153,787 1.6%
ALL OTHER CAUSES
MISCELLANEOUS CAUSE 14 4.8% 0 4 $6,358,672 1.6%
UNKNOWN CAUSE 9 3.1% 6 9 $7,161,927 1.8%
Sub Total 23 8.0% 6 13 $13,520,600 3.5%
Totals 287 100.0% 12 51 $378,219,983 100.0%
National, All Pipeline Systems, 2011
National Hazardous Liquid: Significant Incident Details: 2011
Reported Cause of Incident (B) Number % Fatalities Injuries Property Damage (D) (E) % of Property Damage
CORROSION
EXTERNAL CORROSION 18 12.8% 0 0 $14,319,419 5.5%
INTERNAL CORROSION 20 14.2% 0 0 $19,862,301 7.7%
Sub Total 38 27.1% 0 0 $34,181,721 13.3%
EXCAVATION DAMAGE
OPERATOR/CONTRACTOR EXCAVATION DAMAGE 1 0.7% 0 0 $910,636 0.3%
THIRD PARTY EXCAVATION DAMAGE 14 10.0% 0 0 $12,693,659 4.9%
PREVIOUS DAMAGE DUE TO EXCAVATION 2 1.4% 0 0 $5,011,888 1.9%
Sub Total 17 12.1% 0 0 $18,616,184 7.2%
INCORRECT OPERATION
DAMAGE BY OPERATOR OR OPERATOR'S CONTRACTOR 2 1.4% 0 0 $285,091 0.1%
OVERFILL/OVERFLOW OF TANK/VESSEL/SUMP 4 2.8% 0 0 $366,192 0.1%
INCORRECT VALVE POSITION 1 0.7% 0 0 $0 0.0%
INCORRECT INSTALLATION 2 1.4% 0 0 $939,241 0.3%
OTHER INCORRECT OPERATION 2 1.4% 0 0 $1,572,109 0.6%
Sub Total 11 7.8% 0 0 $3,162,634 1.2%
MAT'L/WELD/EQUIP FAILURE
CONSTRUCTION, INSTALLATION OR FABRICATION-RELATED 8 5.7% 0 0 $3,295,842 1.2%
MANUFACTURING-RELATED 8 5.7% 0 0 $4,820,759 1.8%
MALFUNCTION OF CONTROL/RELIEF EQUIPMENT 4 2.8% 0 0 $201,934 0.0%
PUMP/COMPRESSOR-RELATED EQUIPMENT 11 7.8% 0 0 $1,032,816 0.4%
THREADED CONNECTION/COUPLING FAILURE 8 5.7% 0 0 $7,148,885 2.7%
NON-THREADED CONNECTION FAILURE 10 7.1% 0 0 $25,408,130 9.9%
DEFECTIVE OR LOOSE TUBING/FITTING 1 0.7% 0 0 $237,106 0.0%
FAILURE OF EQUIPMENT BODY 2 1.4% 0 0 $714,496 0.2%
OTHER EQUIPMENT FAILURE 6 4.2% 1 1 $1,554,076 0.6%
Sub Total 58 41.4% 1 1 $44,414,049 17.3%
NATURAL FORCE DAMAGE
HEAVY RAINS/FLOODS 3 2.1% 0 0 $148,180,309 57.7%
LIGHTNING 1 0.7% 0 0 $3,311 0.0%
TEMPERATURE 1 0.7% 0 0 $119,219 0.0%
Sub Total 5 3.5% 0 0 $148,302,840 57.8%
OTHER OUTSIDE FORCE DAMAGE
FIRE/EXPLOSION AS PRIMARY CAUSE 1 0.7% 0 0 $12,652 0.0%
VEHICLE NOT ENGAGED IN EXCAVATION 1 0.7% 0 0 $180,566 0.0%
ELECTRICAL ARCING FROM OTHER EQUIPMENT/FACILITY 2 1.4% 0 0 $917,683 0.3%
OTHER OUTSIDE FORCE DAMAGE 1 0.7% 0 0 $376,460 0.1%
Sub Total 5 3.5% 0 0 $1,487,361 0.5%
ALL OTHER CAUSES
MISCELLANEOUS CAUSE 4 2.8% 0 1 $2,405,122 0.9%
UNKNOWN CAUSE 2 1.4% 0 0 $3,855,807 1.5%
Sub Total 6 4.2% 0 1 $6,260,930 2.4%
Totals 140 100.0% 1 2 $256,425,721 100.0%
National, Hazardous Liquid, 2011
National Hazardous Liquid Onshore: Significant Incident Details: 2011
Reported Cause of Incident (B) Number % Fatalities Injuries Property Damage (D) (E) % of Property Damage
CORROSION
EXTERNAL CORROSION 18 12.8% 0 0 $14,319,419 5.5%
INTERNAL CORROSION 20 14.2% 0 0 $19,862,301 7.7%
Sub Total 38 27.1% 0 0 $34,181,721 13.3%
EXCAVATION DAMAGE
THIRD PARTY EXCAVATION DAMAGE 14 10.0% 0 0 $12,693,659 4.9%
PREVIOUS DAMAGE DUE TO EXCAVATION 2 1.4% 0 0 $5,011,888 1.9%
Sub Total 16 11.4% 0 0 $17,705,548 6.9%
INCORRECT OPERATION
DAMAGE BY OPERATOR OR OPERATOR'S CONTRACTOR 2 1.4% 0 0 $285,091 0.1%
OVERFILL/OVERFLOW OF TANK/VESSEL/SUMP 4 2.8% 0 0 $366,192 0.1%
INCORRECT VALVE POSITION 1 0.7% 0 0 $0 0.0%
INCORRECT INSTALLATION 2 1.4% 0 0 $939,241 0.3%
OTHER INCORRECT OPERATION 2 1.4% 0 0 $1,572,109 0.6%
Sub Total 11 7.8% 0 0 $3,162,634 1.2%
MAT'L/WELD/EQUIP FAILURE
CONSTRUCTION, INSTALLATION OR FABRICATION-RELATED 8 5.7% 0 0 $3,295,842 1.2%
MANUFACTURING-RELATED 8 5.7% 0 0 $4,820,759 1.8%
MALFUNCTION OF CONTROL/RELIEF EQUIPMENT 4 2.8% 0 0 $201,934 0.0%
PUMP/COMPRESSOR-RELATED EQUIPMENT 11 7.8% 0 0 $1,032,816 0.4%
THREADED CONNECTION/COUPLING FAILURE 8 5.7% 0 0 $7,148,885 2.7%
NON-THREADED CONNECTION FAILURE 9 6.4% 0 0 $22,966,192 8.9%
DEFECTIVE OR LOOSE TUBING/FITTING 1 0.7% 0 0 $237,106 0.0%
FAILURE OF EQUIPMENT BODY 2 1.4% 0 0 $714,496 0.2%
OTHER EQUIPMENT FAILURE 6 4.2% 1 1 $1,554,076 0.6%
Sub Total 57 40.7% 1 1 $41,972,111 16.3%
NATURAL FORCE DAMAGE
HEAVY RAINS/FLOODS 3 2.1% 0 0 $148,180,309 57.7%
LIGHTNING 1 0.7% 0 0 $3,311 0.0%
TEMPERATURE 1 0.7% 0 0 $119,219 0.0%
Sub Total 5 3.5% 0 0 $148,302,840 57.8%
OTHER OUTSIDE FORCE DAMAGE
FIRE/EXPLOSION AS PRIMARY CAUSE 1 0.7% 0 0 $12,652 0.0%
VEHICLE NOT ENGAGED IN EXCAVATION 1 0.7% 0 0 $180,566 0.0%
ELECTRICAL ARCING FROM OTHER EQUIPMENT/FACILITY 2 1.4% 0 0 $917,683 0.3%
OTHER OUTSIDE FORCE DAMAGE 1 0.7% 0 0 $376,460 0.1%
Sub Total 5 3.5% 0 0 $1,487,361 0.5%
ALL OTHER CAUSES
MISCELLANEOUS CAUSE 3 2.1% 0 1 $405,112 0.1%
UNKNOWN CAUSE 2 1.4% 0 0 $3,855,807 1.5%
Sub Total 5 3.5% 0 1 $4,260,920 1.6%
Totals 137 97.8% 1 2 $251,073,136 97.9%
National, Hazardous Liquid Onshore, 2011
National Hazardous Liquid Offshore: Significant Incident Details: 2011
Reported Cause of Incident (B) Number % Fatalities Injuries Property Damage (D) (E) % of Property Damage
EXCAVATION DAMAGE
OPERATOR/CONTRACTOR EXCAVATION DAMAGE 1 0.7% 0 0 $910,636 0.3%
Sub Total 1 0.7% 0 0 $910,636 0.3%
MAT'L/WELD/EQUIP FAILURE
NON-THREADED CONNECTION FAILURE 1 0.7% 0 0 $2,441,938 0.9%
Sub Total 1 0.7% 0 0 $2,441,938 0.9%
ALL OTHER CAUSES
MISCELLANEOUS CAUSE 1 0.7% 0 0 $2,000,010 0.7%
Sub Total 1 0.7% 0 0 $2,000,010 0.7%
Totals 3 2.1% 0 0 $5,352,584 2.0%
National, Hazardous Liquid Offshore, 2011
National Gas Transmission: Significant Incident Details: 2011
Reported Cause of Incident (B) Number % Fatalities Injuries Property Damage (D) (E) % of Property Damage
CORROSION
EXTERNAL CORROSION 4 4.8% 0 0 $10,461,049 10.1%
INTERNAL CORROSION 15 18.0% 0 0 $13,242,878 12.7%
Sub Total 19 22.8% 0 0 $23,703,928 22.9%
EXCAVATION DAMAGE
OPERATOR/CONTRACTOR EXCAVATION DAMAGE 2 2.4% 0 0 $201,456 0.1%
THIRD PARTY EXCAVATION DAMAGE 5 6.0% 0 0 $9,267,544 8.9%
PREVIOUS DAMAGE DUE TO EXCAVATION 2 2.4% 0 0 $298,713 0.2%
Sub Total 9 10.8% 0 0 $9,767,713 9.4%
INCORRECT OPERATION
INCORRECT VALVE POSITION 1 1.2% 0 0 $255,677 0.2%
PIPELINE/EQUIPMENT OVERPRESSURED 1 1.2% 0 0 $79,813 0.0%
OTHER INCORRECT OPERATION 4 4.8% 0 1 $7,145,930 6.9%
Sub Total 6 7.2% 0 1 $7,481,421 7.2%
MAT'L/WELD/EQUIP FAILURE
CONSTRUCTION, INSTALLATION OR FABRICATION-RELATED 10 12.0% 0 0 $12,246,659 11.8%
MANUFACTURING-RELATED 2 2.4% 0 0 $336,012 0.3%
ENVIRONMENTAL CRACKING-RELATED 2 2.4% 0 0 $532,639 0.5%
MALFUNCTION OF CONTROL/RELIEF EQUIPMENT 7 8.4% 0 0 $32,580,847 31.4%
THREADED CONNECTION/COUPLING FAILURE 4 4.8% 0 0 $788,280 0.7%
OTHER EQUIPMENT FAILURE 2 2.4% 0 0 $232,724 0.2%
Sub Total 27 32.5% 0 0 $46,717,165 45.1%
NATURAL FORCE DAMAGE
EARTH MOVEMENT 4 4.8% 0 0 $4,806,194 4.6%
HEAVY RAINS/FLOODS 3 3.6% 0 0 $1,276,028 1.2%
LIGHTNING 1 1.2% 0 0 $188,622 0.1%
TEMPERATURE 1 1.2% 0 0 $272,609 0.2%
HIGH WINDS 2 2.4% 0 0 $1,374,329 1.3%
OTHER NATURAL FORCE DAMAGE 2 2.4% 0 0 $2,090,923 2.0%
Sub Total 13 15.6% 0 0 $10,008,707 9.6%
OTHER OUTSIDE FORCE DAMAGE
FISHING OR MARITIME ACTIVITY 4 4.8% 0 0 $2,082,851 2.0%
OTHER OUTSIDE FORCE DAMAGE 2 2.4% 0 0 $866,924 0.8%
Sub Total 6 7.2% 0 0 $2,949,775 2.8%
ALL OTHER CAUSES
MISCELLANEOUS CAUSE 3 3.6% 0 0 $2,891,206 2.7%
Sub Total 3 3.6% 0 0 $2,891,206 2.7%
Totals 83 100.0% 0 1 $103,519,917 100.0%
National, Gas Transmission, 2011
National Gas Transmission Onshore: Significant Incident Details: 2011
Reported Cause of Incident (B) Number % Fatalities Injuries Property Damage (D) (E) % of Property Damage
CORROSION
EXTERNAL CORROSION 4 4.8% 0 0 $10,461,049 10.1%
INTERNAL CORROSION 9 10.8% 0 0 $9,246,397 8.9%
Sub Total 13 15.6% 0 0 $19,707,447 19.0%
EXCAVATION DAMAGE
OPERATOR/CONTRACTOR EXCAVATION DAMAGE 2 2.4% 0 0 $201,456 0.1%
THIRD PARTY EXCAVATION DAMAGE 4 4.8% 0 0 $853,477 0.8%
PREVIOUS DAMAGE DUE TO EXCAVATION 2 2.4% 0 0 $298,713 0.2%
Sub Total 8 9.6% 0 0 $1,353,646 1.3%
INCORRECT OPERATION
INCORRECT VALVE POSITION 1 1.2% 0 0 $255,677 0.2%
PIPELINE/EQUIPMENT OVERPRESSURED 1 1.2% 0 0 $79,813 0.0%
OTHER INCORRECT OPERATION 4 4.8% 0 1 $7,145,930 6.9%
Sub Total 6 7.2% 0 1 $7,481,421 7.2%
MAT'L/WELD/EQUIP FAILURE
CONSTRUCTION, INSTALLATION OR FABRICATION-RELATED 10 12.0% 0 0 $12,246,659 11.8%
MANUFACTURING-RELATED 2 2.4% 0 0 $336,012 0.3%
ENVIRONMENTAL CRACKING-RELATED 1 1.2% 0 0 $201,377 0.1%
MALFUNCTION OF CONTROL/RELIEF EQUIPMENT 7 8.4% 0 0 $32,580,847 31.4%
THREADED CONNECTION/COUPLING FAILURE 3 3.6% 0 0 $658,373 0.6%
OTHER EQUIPMENT FAILURE 2 2.4% 0 0 $232,724 0.2%
Sub Total 25 30.1% 0 0 $46,255,995 44.6%
NATURAL FORCE DAMAGE
EARTH MOVEMENT 4 4.8% 0 0 $4,806,194 4.6%
HEAVY RAINS/FLOODS 3 3.6% 0 0 $1,276,028 1.2%
LIGHTNING 1 1.2% 0 0 $188,622 0.1%
TEMPERATURE 1 1.2% 0 0 $272,609 0.2%
HIGH WINDS 2 2.4% 0 0 $1,374,329 1.3%
OTHER NATURAL FORCE DAMAGE 2 2.4% 0 0 $2,090,923 2.0%
Sub Total 13 15.6% 0 0 $10,008,707 9.6%
OTHER OUTSIDE FORCE DAMAGE
OTHER OUTSIDE FORCE DAMAGE 2 2.4% 0 0 $866,924 0.8%
Sub Total 2 2.4% 0 0 $866,924 0.8%
ALL OTHER CAUSES
MISCELLANEOUS CAUSE 3 3.6% 0 0 $2,891,206 2.7%
Sub Total 3 3.6% 0 0 $2,891,206 2.7%
Totals 70 84.3% 0 1 $88,565,349 85.5%
National, Gas Transmission Onshore, 2011
National Gas Transmission Offshore: Significant Incident Details: 2011
Reported Cause of Incident (B) Number % Fatalities Injuries Property Damage (D) (E) % of Property Damage
CORROSION
INTERNAL CORROSION 6 7.2% 0 0 $3,996,480 3.8%
Sub Total 6 7.2% 0 0 $3,996,480 3.8%
EXCAVATION DAMAGE
THIRD PARTY EXCAVATION DAMAGE 1 1.2% 0 0 $8,414,066 8.1%
Sub Total 1 1.2% 0 0 $8,414,066 8.1%
MAT'L/WELD/EQUIP FAILURE
ENVIRONMENTAL CRACKING-RELATED 1 1.2% 0 0 $331,261 0.3%
THREADED CONNECTION/COUPLING FAILURE 1 1.2% 0 0 $129,907 0.1%
Sub Total 2 2.4% 0 0 $461,169 0.4%
OTHER OUTSIDE FORCE DAMAGE
FISHING OR MARITIME ACTIVITY 4 4.8% 0 0 $2,082,851 2.0%
Sub Total 4 4.8% 0 0 $2,082,851 2.0%
Totals 13 15.6% 0 0 $14,954,567 14.4%
National, Gas Transmission Offshore, 2011
National Gas Gathering: Significant Incident Details: 2011
Reported Cause of Incident (B) Number % Fatalities Injuries Property Damage (D) (E) % of Property Damage
CORROSION
INTERNAL CORROSION 6 100.0% 0 0 $1,650,443 100.0%
Sub Total 6100.0% 0 0 $1,650,443100.0%
Totals 6 100.0% 0 0 $1,650,443 100.0%
National, Gas Gathering, 2011
National Gas Distribution: Significant Incident Details: 2011
Reported Cause of Incident (B) Number (C) % Fatalities Injuries Property Damage (D) (E) % of Property Damage
CORROSION
EXTERNAL CORROSION 2 3.4% 1 2 $42,923 0.2%
Sub Total 2 3.4% 1 2 $42,923 0.2%
EXCAVATION DAMAGE
OPERATOR/CONTRACTOR EXCAVATION DAMAGE 2 3.4% 0 6 $227,202 1.3%
THIRD PARTY EXCAVATION DAMAGE 15 25.8% 2 10 $3,261,214 19.6%
Sub Total 17 29.3% 2 16 $3,488,417 20.9%
INCORRECT OPERATION
INCORRECT VALVE POSITION 1 1.7% 0 0 $1,245,462 7.4%
OTHER INCORRECT OPERATION 4 6.9% 0 3 $691,711 4.1%
Sub Total 5 8.6% 0 3 $1,937,173 11.6%
MAT'L/WELD/EQUIP FAILURE
BODY OF PIPE 2 3.4% 1 7 $546,632 3.2%
MECHANICAL FITTING 2 3.4% 0 0 $1,363,703 8.2%
MALFUNCTION OF CONTROL/RELIEF EQUIPMENT 2 3.4% 0 1 $1,387,253 8.3%
VALVE 1 1.7% 0 0 $137,806 0.8%
Sub Total 7 12.0% 1 8 $3,435,397 20.6%
NATURAL FORCE DAMAGE
HEAVY RAINS/FLOODS 2 3.4% 0 0 $1,634,874 9.8%
Sub Total 2 3.4% 0 0 $1,634,874 9.8%
OTHER OUTSIDE FORCE DAMAGE
VEHICLE NOT ENGAGED IN EXCAVATION 5 8.6% 1 4 $247,234 1.4%
ELECTRICAL ARCING FROM OTHER EQUIPMENT/FACILITY 1 1.7% 0 2 $529,278 3.1%
PREVIOUS MECHANICAL DAMAGE 1 1.7% 0 0 $120,235 0.7%
OTHER OUTSIDE FORCE DAMAGE 4 6.9% 0 1 $819,901 4.9%
Sub Total 11 18.9% 1 7 $1,716,649 10.3%
ALL OTHER CAUSES
MISCELLANEOUS CAUSE 7 12.0% 0 3 $1,062,344 6.3%
UNKNOWN CAUSE 7 12.0% 6 9 $3,306,119 19.8%
Sub Total 14 24.1% 6 12 $4,368,463 26.2%
Totals 58 100.0% 11 48 $16,623,899 100.0%
National, Gas Distribution, 2011

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 - Apr 01, 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 and Mileage Reports for more pipeline safety reports.

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