Pipeline Safety Stakeholder Communications

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.

• All Pipeline Systems
• Hazardous Liquid
• Gas Transmission
• Gas Gathering
• Gas Distribution

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	22	7.7%	1	2	$21,807,108	6.0%
INTERNAL CORROSION	36	12.6%	0	0	$31,112,090	8.6%
Sub Total	58	20.4%	1	2	$52,919,198	14.6%
EXCAVATION DAMAGE
OPERATOR/CONTRACTOR EXCAVATION DAMAGE	5	1.7%	0	6	$1,351,446	0.3%
THIRD PARTY EXCAVATION DAMAGE	33	11.6%	2	10	$16,427,580	4.5%
PREVIOUS DAMAGE DUE TO EXCAVATION	4	1.4%	0	0	$5,254,836	1.4%
Sub Total	42	14.7%	2	16	$23,033,863	6.3%
INCORRECT OPERATION
DAMAGE BY OPERATOR OR OPERATOR'S CONTRACTOR	2	0.7%	0	0	$283,409	0.0%
OVERFILL/OVERFLOW OF TANK/VESSEL/SUMP	4	1.4%	0	0	$359,719	0.1%
INCORRECT VALVE POSITION	3	1.0%	0	0	$1,474,646	0.4%
PIPELINE/EQUIPMENT OVERPRESSURED	1	0.3%	0	0	$95,000	0.0%
INCORRECT INSTALLATION	2	0.7%	0	0	$922,988	0.2%
OTHER INCORRECT OPERATION	11	3.8%	0	4	$9,597,709	2.6%
Sub Total	23	8.1%	0	4	$12,733,473	3.5%
MAT'L/WELD/EQUIP FAILURE
CONSTRUCTION, INSTALLATION OR FABRICATION-RELATED	18	6.3%	0	0	$15,469,146	4.2%
MANUFACTURING-RELATED	9	3.1%	0	0	$4,991,512	1.3%
ENVIRONMENTAL CRACKING-RELATED	2	0.7%	0	0	$524,392	0.1%
BODY OF PIPE	2	0.7%	1	7	$539,667	0.1%
MECHANICAL FITTING	2	0.7%	0	0	$1,340,479	0.3%
MALFUNCTION OF CONTROL/RELIEF EQUIPMENT	13	4.5%	0	1	$33,836,935	9.3%
PUMP/COMPRESSOR-RELATED EQUIPMENT	11	3.8%	0	0	$1,021,095	0.2%
THREADED CONNECTION/COUPLING FAILURE	11	3.8%	0	0	$7,502,301	2.0%
NON-THREADED CONNECTION FAILURE	10	3.5%	0	0	$21,502,888	5.9%
DEFECTIVE OR LOOSE TUBING/FITTING	1	0.3%	0	0	$232,914	0.0%
FAILURE OF EQUIPMENT BODY	2	0.7%	0	0	$702,570	0.1%
OTHER EQUIPMENT FAILURE	9	3.1%	1	1	$2,054,846	0.5%
Sub Total	90	31.6%	2	9	$89,718,752	24.8%
NATURAL FORCE DAMAGE
EARTH MOVEMENT	4	1.4%	0	0	$4,768,056	1.3%
HEAVY RAINS/FLOODS	7	2.4%	0	0	$147,179,893	40.7%
LIGHTNING	2	0.7%	0	0	$190,085	0.0%
TEMPERATURE	2	0.7%	0	0	$427,859	0.1%
HIGH WINDS	2	0.7%	0	0	$1,351,309	0.3%
OTHER NATURAL FORCE DAMAGE	2	0.7%	0	0	$2,114,716	0.5%
Sub Total	19	6.6%	0	0	$156,031,921	43.1%
OTHER OUTSIDE FORCE DAMAGE
FIRE/EXPLOSION AS PRIMARY CAUSE	1	0.3%	0	0	$12,499	0.0%
VEHICLE NOT ENGAGED IN EXCAVATION	6	2.1%	1	4	$421,773	0.1%
FISHING OR MARITIME ACTIVITY	4	1.4%	0	0	$2,074,717	0.5%
ELECTRICAL ARCING FROM OTHER EQUIPMENT/FACILITY	3	1.0%	0	2	$1,429,245	0.4%
PREVIOUS MECHANICAL DAMAGE	1	0.3%	0	0	$118,266	0.0%
OTHER OUTSIDE FORCE DAMAGE	8	2.8%	0	1	$2,245,638	0.6%
Sub Total	23	8.1%	1	7	$6,302,140	1.7%
ALL OTHER CAUSES
MISCELLANEOUS CAUSE	14	4.9%	0	4	$6,304,755	1.7%
UNKNOWN CAUSE	15	5.2%	6	13	$14,560,127	4.0%
Sub Total	29	10.2%	6	17	$20,864,882	5.7%
Totals	284	100.0%	12	55	$361,604,233	100.0%

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• All Hazardous Liquid Systems
• Onshore Only
• Offshore Only

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	17	12.2%	0	0	$13,506,465	5.4%
INTERNAL CORROSION	20	14.3%	0	0	$19,475,220	7.8%
Sub Total	37	26.6%	0	0	$32,981,685	13.2%
EXCAVATION DAMAGE
OPERATOR/CONTRACTOR EXCAVATION DAMAGE	1	0.7%	0	0	$908,679	0.3%
THIRD PARTY EXCAVATION DAMAGE	14	10.0%	0	0	$12,325,145	4.9%
PREVIOUS DAMAGE DUE TO EXCAVATION	2	1.4%	0	0	$4,926,587	1.9%
Sub Total	17	12.2%	0	0	$18,160,413	7.3%
INCORRECT OPERATION
DAMAGE BY OPERATOR OR OPERATOR'S CONTRACTOR	2	1.4%	0	0	$283,409	0.1%
OVERFILL/OVERFLOW OF TANK/VESSEL/SUMP	4	2.8%	0	0	$359,719	0.1%
INCORRECT VALVE POSITION	1	0.7%	0	0	$0	0.0%
INCORRECT INSTALLATION	2	1.4%	0	0	$922,988	0.3%
OTHER INCORRECT OPERATION	3	2.1%	0	0	$1,864,853	0.7%
Sub Total	12	8.6%	0	0	$3,430,970	1.3%
MAT'L/WELD/EQUIP FAILURE
CONSTRUCTION, INSTALLATION OR FABRICATION-RELATED	8	5.7%	0	0	$3,251,959	1.3%
MANUFACTURING-RELATED	8	5.7%	0	0	$4,767,922	1.9%
MALFUNCTION OF CONTROL/RELIEF EQUIPMENT	4	2.8%	0	0	$199,354	0.0%
PUMP/COMPRESSOR-RELATED EQUIPMENT	11	7.9%	0	0	$1,021,095	0.4%
THREADED CONNECTION/COUPLING FAILURE	7	5.0%	0	0	$6,725,768	2.7%
NON-THREADED CONNECTION FAILURE	10	7.1%	0	0	$21,502,888	8.6%
DEFECTIVE OR LOOSE TUBING/FITTING	1	0.7%	0	0	$232,914	0.0%
FAILURE OF EQUIPMENT BODY	2	1.4%	0	0	$702,570	0.2%
OTHER EQUIPMENT FAILURE	6	4.3%	1	1	$1,528,595	0.6%
Sub Total	57	41.0%	1	1	$39,933,070	16.0%
NATURAL FORCE DAMAGE
HEAVY RAINS/FLOODS	3	2.1%	0	0	$145,795,465	58.7%
LIGHTNING	1	0.7%	0	0	$3,253	0.0%
TEMPERATURE	1	0.7%	0	0	$117,114	0.0%
Sub Total	5	3.6%	0	0	$145,915,833	58.8%
OTHER OUTSIDE FORCE DAMAGE
FIRE/EXPLOSION AS PRIMARY CAUSE	1	0.7%	0	0	$12,499	0.0%
VEHICLE NOT ENGAGED IN EXCAVATION	1	0.7%	0	0	$177,693	0.0%
ELECTRICAL ARCING FROM OTHER EQUIPMENT/FACILITY	2	1.4%	0	0	$909,237	0.3%
OTHER OUTSIDE FORCE DAMAGE	1	0.7%	0	0	$370,769	0.1%
Sub Total	5	3.6%	0	0	$1,470,199	0.5%
ALL OTHER CAUSES
MISCELLANEOUS CAUSE	4	2.8%	0	1	$2,404,775	0.9%
UNKNOWN CAUSE	2	1.4%	0	0	$3,828,545	1.5%
Sub Total	6	4.3%	0	1	$6,233,321	2.5%
Totals	139	100.0%	1	2	$248,125,493	100.0%

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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	17	12.2%	0	0	$13,506,465	5.4%
INTERNAL CORROSION	20	14.3%	0	0	$19,475,220	7.8%
Sub Total	37	26.6%	0	0	$32,981,685	13.2%
EXCAVATION DAMAGE
THIRD PARTY EXCAVATION DAMAGE	14	10.0%	0	0	$12,325,145	4.9%
PREVIOUS DAMAGE DUE TO EXCAVATION	2	1.4%	0	0	$4,926,587	1.9%
Sub Total	16	11.5%	0	0	$17,251,733	6.9%
INCORRECT OPERATION
DAMAGE BY OPERATOR OR OPERATOR'S CONTRACTOR	2	1.4%	0	0	$283,409	0.1%
OVERFILL/OVERFLOW OF TANK/VESSEL/SUMP	4	2.8%	0	0	$359,719	0.1%
INCORRECT VALVE POSITION	1	0.7%	0	0	$0	0.0%
INCORRECT INSTALLATION	2	1.4%	0	0	$922,988	0.3%
OTHER INCORRECT OPERATION	3	2.1%	0	0	$1,864,853	0.7%
Sub Total	12	8.6%	0	0	$3,430,970	1.3%
MAT'L/WELD/EQUIP FAILURE
CONSTRUCTION, INSTALLATION OR FABRICATION-RELATED	8	5.7%	0	0	$3,251,959	1.3%
MANUFACTURING-RELATED	8	5.7%	0	0	$4,767,922	1.9%
MALFUNCTION OF CONTROL/RELIEF EQUIPMENT	4	2.8%	0	0	$199,354	0.0%
PUMP/COMPRESSOR-RELATED EQUIPMENT	11	7.9%	0	0	$1,021,095	0.4%
THREADED CONNECTION/COUPLING FAILURE	7	5.0%	0	0	$6,725,768	2.7%
NON-THREADED CONNECTION FAILURE	9	6.4%	0	0	$19,082,908	7.6%
DEFECTIVE OR LOOSE TUBING/FITTING	1	0.7%	0	0	$232,914	0.0%
FAILURE OF EQUIPMENT BODY	2	1.4%	0	0	$702,570	0.2%
OTHER EQUIPMENT FAILURE	6	4.3%	1	1	$1,528,595	0.6%
Sub Total	56	40.2%	1	1	$37,513,090	15.1%
NATURAL FORCE DAMAGE
HEAVY RAINS/FLOODS	3	2.1%	0	0	$145,795,465	58.7%
LIGHTNING	1	0.7%	0	0	$3,253	0.0%
TEMPERATURE	1	0.7%	0	0	$117,114	0.0%
Sub Total	5	3.6%	0	0	$145,915,833	58.8%
OTHER OUTSIDE FORCE DAMAGE
FIRE/EXPLOSION AS PRIMARY CAUSE	1	0.7%	0	0	$12,499	0.0%
VEHICLE NOT ENGAGED IN EXCAVATION	1	0.7%	0	0	$177,693	0.0%
ELECTRICAL ARCING FROM OTHER EQUIPMENT/FACILITY	2	1.4%	0	0	$909,237	0.3%
OTHER OUTSIDE FORCE DAMAGE	1	0.7%	0	0	$370,769	0.1%
Sub Total	5	3.6%	0	0	$1,470,199	0.5%
ALL OTHER CAUSES
MISCELLANEOUS CAUSE	3	2.1%	0	1	$404,765	0.1%
UNKNOWN CAUSE	2	1.4%	0	0	$3,828,545	1.5%
Sub Total	5	3.6%	0	1	$4,233,310	1.7%
Totals	136	97.8%	1	2	$242,796,824	97.8%

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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	$908,679	0.3%
Sub Total	1	0.7%	0	0	$908,679	0.3%
MAT'L/WELD/EQUIP FAILURE
NON-THREADED CONNECTION FAILURE	1	0.7%	0	0	$2,419,979	0.9%
Sub Total	1	0.7%	0	0	$2,419,979	0.9%
ALL OTHER CAUSES
MISCELLANEOUS CAUSE	1	0.7%	0	0	$2,000,010	0.8%
Sub Total	1	0.7%	0	0	$2,000,010	0.8%
Totals	3	2.1%	0	0	$5,328,669	2.1%

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• All Gas Transmission Systems
• Onshore Only
• Offshore Only

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	3	3.7%	0	0	$8,258,268	8.6%
INTERNAL CORROSION	13	16.2%	0	0	$10,992,731	11.4%
Sub Total	16	20.0%	0	0	$19,250,999	20.0%
EXCAVATION DAMAGE
OPERATOR/CONTRACTOR EXCAVATION DAMAGE	2	2.5%	0	0	$210,212	0.2%
THIRD PARTY EXCAVATION DAMAGE	4	5.0%	0	0	$869,078	0.9%
PREVIOUS DAMAGE DUE TO EXCAVATION	2	2.5%	0	0	$328,249	0.3%
Sub Total	8	10.0%	0	0	$1,407,539	1.4%
INCORRECT OPERATION
INCORRECT VALVE POSITION	1	1.2%	0	0	$251,182	0.2%
PIPELINE/EQUIPMENT OVERPRESSURED	1	1.2%	0	0	$95,000	0.1%
OTHER INCORRECT OPERATION	4	5.0%	0	1	$7,053,357	7.3%
Sub Total	6	7.5%	0	1	$7,399,540	7.7%
MAT'L/WELD/EQUIP FAILURE
CONSTRUCTION, INSTALLATION OR FABRICATION-RELATED	10	12.5%	0	0	$12,217,187	12.7%
MANUFACTURING-RELATED	1	1.2%	0	0	$223,590	0.2%
ENVIRONMENTAL CRACKING-RELATED	2	2.5%	0	0	$524,392	0.5%
MALFUNCTION OF CONTROL/RELIEF EQUIPMENT	7	8.7%	0	0	$32,274,623	33.6%
THREADED CONNECTION/COUPLING FAILURE	4	5.0%	0	0	$776,533	0.8%
OTHER EQUIPMENT FAILURE	2	2.5%	0	0	$238,398	0.2%
Sub Total	26	32.5%	0	0	$46,254,725	48.2%
NATURAL FORCE DAMAGE
EARTH MOVEMENT	4	5.0%	0	0	$4,768,056	4.9%
HEAVY RAINS/FLOODS	3	3.7%	0	0	$1,307,846	1.3%
LIGHTNING	1	1.2%	0	0	$186,831	0.2%
TEMPERATURE	1	1.2%	0	0	$310,744	0.3%
HIGH WINDS	2	2.5%	0	0	$1,351,309	1.4%
OTHER NATURAL FORCE DAMAGE	1	1.2%	0	0	$1,805,583	1.8%
Sub Total	12	15.0%	0	0	$9,730,372	10.1%
OTHER OUTSIDE FORCE DAMAGE
FISHING OR MARITIME ACTIVITY	4	5.0%	0	0	$2,074,717	2.1%
OTHER OUTSIDE FORCE DAMAGE	2	2.5%	0	0	$905,844	0.9%
Sub Total	6	7.5%	0	0	$2,980,561	3.1%
ALL OTHER CAUSES
MISCELLANEOUS CAUSE	3	3.7%	0	0	$2,856,374	2.9%
UNKNOWN CAUSE	3	3.7%	0	0	$5,933,438	6.1%
Sub Total	6	7.5%	0	0	$8,789,812	9.1%
Totals	80	100.0%	0	1	$95,813,551	100.0%

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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	3	3.7%	0	0	$8,258,268	8.6%
INTERNAL CORROSION	7	8.7%	0	0	$7,065,304	7.3%
Sub Total	10	12.5%	0	0	$15,323,573	15.9%
EXCAVATION DAMAGE
OPERATOR/CONTRACTOR EXCAVATION DAMAGE	2	2.5%	0	0	$210,212	0.2%
THIRD PARTY EXCAVATION DAMAGE	4	5.0%	0	0	$869,078	0.9%
PREVIOUS DAMAGE DUE TO EXCAVATION	2	2.5%	0	0	$328,249	0.3%
Sub Total	8	10.0%	0	0	$1,407,539	1.4%
INCORRECT OPERATION
INCORRECT VALVE POSITION	1	1.2%	0	0	$251,182	0.2%
PIPELINE/EQUIPMENT OVERPRESSURED	1	1.2%	0	0	$95,000	0.1%
OTHER INCORRECT OPERATION	4	5.0%	0	1	$7,053,357	7.3%
Sub Total	6	7.5%	0	1	$7,399,540	7.7%
MAT'L/WELD/EQUIP FAILURE
CONSTRUCTION, INSTALLATION OR FABRICATION-RELATED	10	12.5%	0	0	$12,217,187	12.7%
MANUFACTURING-RELATED	1	1.2%	0	0	$223,590	0.2%
ENVIRONMENTAL CRACKING-RELATED	1	1.2%	0	0	$198,515	0.2%
MALFUNCTION OF CONTROL/RELIEF EQUIPMENT	7	8.7%	0	0	$32,274,623	33.6%
THREADED CONNECTION/COUPLING FAILURE	3	3.7%	0	0	$648,923	0.6%
OTHER EQUIPMENT FAILURE	2	2.5%	0	0	$238,398	0.2%
Sub Total	24	30.0%	0	0	$45,801,238	47.8%
NATURAL FORCE DAMAGE
EARTH MOVEMENT	4	5.0%	0	0	$4,768,056	4.9%
HEAVY RAINS/FLOODS	3	3.7%	0	0	$1,307,846	1.3%
LIGHTNING	1	1.2%	0	0	$186,831	0.2%
TEMPERATURE	1	1.2%	0	0	$310,744	0.3%
HIGH WINDS	2	2.5%	0	0	$1,351,309	1.4%
OTHER NATURAL FORCE DAMAGE	1	1.2%	0	0	$1,805,583	1.8%
Sub Total	12	15.0%	0	0	$9,730,372	10.1%
OTHER OUTSIDE FORCE DAMAGE
OTHER OUTSIDE FORCE DAMAGE	2	2.5%	0	0	$905,844	0.9%
Sub Total	2	2.5%	0	0	$905,844	0.9%
ALL OTHER CAUSES
MISCELLANEOUS CAUSE	3	3.7%	0	0	$2,856,374	2.9%
UNKNOWN CAUSE	3	3.7%	0	0	$5,933,438	6.1%
Sub Total	6	7.5%	0	0	$8,789,812	9.1%
Totals	68	85.0%	0	1	$89,357,920	93.2%

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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	7.5%	0	0	$3,927,426	4.1%
Sub Total	6	7.5%	0	0	$3,927,426	4.1%
MAT'L/WELD/EQUIP FAILURE
ENVIRONMENTAL CRACKING-RELATED	1	1.2%	0	0	$325,876	0.3%
THREADED CONNECTION/COUPLING FAILURE	1	1.2%	0	0	$127,610	0.1%
Sub Total	2	2.5%	0	0	$453,487	0.4%
OTHER OUTSIDE FORCE DAMAGE
FISHING OR MARITIME ACTIVITY	4	5.0%	0	0	$2,074,717	2.1%
Sub Total	4	5.0%	0	0	$2,074,717	2.1%
Totals	12	15.0%	0	0	$6,455,631	6.7%

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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	3	60.0%	0	0	$644,139	51.9%
Sub Total	3	60.0%	0	0	$644,139	51.9%
MAT'L/WELD/EQUIP FAILURE
OTHER EQUIPMENT FAILURE	1	20.0%	0	0	$287,851	23.1%
Sub Total	1	20.0%	0	0	$287,851	23.1%
NATURAL FORCE DAMAGE
OTHER NATURAL FORCE DAMAGE	1	20.0%	0	0	$309,133	24.9%
Sub Total	1	20.0%	0	0	$309,133	24.9%
Totals	5	100.0%	0	0	$1,241,124	100.0%

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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	3.3%	1	2	$42,374	0.2%
Sub Total	2	3.3%	1	2	$42,374	0.2%
EXCAVATION DAMAGE
OPERATOR/CONTRACTOR EXCAVATION DAMAGE	2	3.3%	0	6	$232,554	1.4%
THIRD PARTY EXCAVATION DAMAGE	15	25.0%	2	10	$3,233,356	19.6%
Sub Total	17	28.3%	2	16	$3,465,911	21.1%
INCORRECT OPERATION
INCORRECT VALVE POSITION	1	1.6%	0	0	$1,223,464	7.4%
OTHER INCORRECT OPERATION	4	6.6%	0	3	$679,498	4.1%
Sub Total	5	8.3%	0	3	$1,902,963	11.5%
MAT'L/WELD/EQUIP FAILURE
BODY OF PIPE	2	3.3%	1	7	$539,667	3.2%
MECHANICAL FITTING	2	3.3%	0	0	$1,340,479	8.1%
MALFUNCTION OF CONTROL/RELIEF EQUIPMENT	2	3.3%	0	1	$1,362,957	8.3%
Sub Total	6	10.0%	1	8	$3,243,104	19.7%
NATURAL FORCE DAMAGE
HEAVY RAINS/FLOODS	1	1.6%	0	0	$76,582	0.4%
Sub Total	1	1.6%	0	0	$76,582	0.4%
OTHER OUTSIDE FORCE DAMAGE
VEHICLE NOT ENGAGED IN EXCAVATION	5	8.3%	1	4	$244,080	1.4%
ELECTRICAL ARCING FROM OTHER EQUIPMENT/FACILITY	1	1.6%	0	2	$520,007	3.1%
PREVIOUS MECHANICAL DAMAGE	1	1.6%	0	0	$118,266	0.7%
OTHER OUTSIDE FORCE DAMAGE	5	8.3%	0	1	$969,025	5.9%
Sub Total	12	20.0%	1	7	$1,851,379	11.2%
ALL OTHER CAUSES
MISCELLANEOUS CAUSE	7	11.6%	0	3	$1,043,605	6.3%
UNKNOWN CAUSE	10	16.6%	6	13	$4,798,143	29.2%
Sub Total	17	28.3%	6	16	$5,841,749	35.5%
Totals	60	100.0%	11	52	$16,424,063	100.0%

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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 prior to 2012 are presented in 2012 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 - April 30, 2013. 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.