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: 2010

Reported Cause of Incident (B)	Number (C)	%	Fatalities	Injuries	Property Damage (D) (E)	% of Property Damage
CORROSION
EXTERNAL CORROSION	24	9.2%	0	2	$21,388,244	1.4%
INTERNAL CORROSION	33	12.6%	0	0	$15,175,515	1.0%
Sub Total	57	21.9%	0	2	$36,563,759	2.4%
EXCAVATION DAMAGE
OPERATOR/CONTRACTOR EXCAVATION DAMAGE	4	1.5%	0	0	$507,159	0.0%
THIRD PARTY EXCAVATION DAMAGE	29	11.1%	5	11	$21,297,752	1.4%
PREVIOUS DAMAGE DUE TO EXCAVATION	2	0.7%	0	0	$705,823	0.0%
Sub Total	35	13.4%	5	11	$22,510,735	1.5%
INCORRECT OPERATION
DAMAGE BY OPERATOR OR OPERATOR'S CONTRACTOR	2	0.7%	1	1	$33,035	0.0%
OVERFILL/OVERFLOW OF TANK/VESSEL/SUMP	1	0.3%	0	0	$28,978,502	1.9%
INCORRECT VALVE POSITION	5	1.9%	0	0	$1,509,079	0.1%
PIPELINE/EQUIPMENT OVERPRESSURED	6	2.3%	0	0	$6,516,114	0.4%
INCORRECT INSTALLATION	2	0.7%	0	1	$214,110	0.0%
OTHER INCORRECT OPERATION	11	4.2%	1	13	$22,330,573	1.5%
Sub Total	27	10.3%	2	15	$59,581,416	4.0%
MAT'L/WELD/EQUIP FAILURE
CONSTRUCTION, INSTALLATION OR FABRICATION-RELATED	21	8.0%	0	0	$6,519,332	0.4%
MANUFACTURING-RELATED	12	4.6%	8	51	$393,041,260	26.4%
ENVIRONMENTAL CRACKING-RELATED	3	1.1%	0	0	$831,314,311	55.9%
BODY OF PIPE	2	0.7%	0	5	$470,716	0.0%
MECHANICAL FITTING	1	0.3%	1	1	$0	0.0%
OTHER PIPE/WELD/JOINT FAILURE	1	0.3%	0	1	$141,394	0.0%
MALFUNCTION OF CONTROL/RELIEF EQUIPMENT	7	2.6%	0	0	$1,928,965	0.1%
PUMP/COMPRESSOR-RELATED EQUIPMENT	4	1.5%	0	0	$486,579	0.0%
THREADED CONNECTION/COUPLING FAILURE	7	2.6%	0	0	$1,617,970	0.1%
NON-THREADED CONNECTION FAILURE	6	2.3%	0	0	$1,351,948	0.0%
DEFECTIVE OR LOOSE TUBING/FITTING	3	1.1%	0	0	$441,090	0.0%
FAILURE OF EQUIPMENT BODY	5	1.9%	0	0	$3,690,912	0.2%
OTHER EQUIPMENT FAILURE	9	3.4%	0	1	$2,110,009	0.1%
Sub Total	81	31.1%	9	59	$1,243,114,491	83.6%
NATURAL FORCE DAMAGE
EARTH MOVEMENT	2	0.7%	0	0	$624,622	0.0%
HEAVY RAINS/FLOODS	2	0.7%	0	0	$2,001,906	0.1%
LIGHTNING	2	0.7%	0	0	$540,322	0.0%
TEMPERATURE	7	2.6%	0	1	$1,037,112	0.0%
OTHER NATURAL FORCE DAMAGE	2	0.7%	0	0	$795,498	0.0%
Sub Total	15	5.7%	0	1	$4,999,462	0.3%
OTHER OUTSIDE FORCE DAMAGE
VEHICLE NOT ENGAGED IN EXCAVATION	9	3.4%	0	2	$7,326,870	0.4%
FISHING OR MARITIME ACTIVITY	1	0.3%	0	0	$2,096,730	0.1%
ELECTRICAL ARCING FROM OTHER EQUIPMENT/FACILITY	4	1.5%	0	3	$43,459,496	2.9%
OTHER OUTSIDE FORCE DAMAGE	7	2.6%	0	0	$3,580,493	0.2%
Sub Total	21	8.0%	0	5	$56,463,592	3.8%
ALL OTHER CAUSES
MISCELLANEOUS CAUSE	13	5.0%	0	6	$9,040,341	0.6%
UNKNOWN CAUSE	11	4.2%	3	5	$53,126,460	3.5%
Sub Total	24	9.2%	3	11	$62,166,801	4.1%
Totals	260	100.0%	19	104	$1,485,400,258	100.0%

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• All Hazardous Liquid Systems
• Onshore Only
• Offshore Only

National Hazardous Liquid: Significant Incident Details: 2010

Reported Cause of Incident (B)	Number	%	Fatalities	Injuries	Property Damage (D) (E)	% of Property Damage
CORROSION
EXTERNAL CORROSION	13	10.7%	0	0	$17,698,173	1.6%
INTERNAL CORROSION	13	10.7%	0	0	$3,378,723	0.3%
Sub Total	26	21.4%	0	0	$21,076,897	2.0%
EXCAVATION DAMAGE
OPERATOR/CONTRACTOR EXCAVATION DAMAGE	2	1.6%	0	0	$92,262	0.0%
THIRD PARTY EXCAVATION DAMAGE	10	8.2%	1	1	$16,601,218	1.5%
PREVIOUS DAMAGE DUE TO EXCAVATION	1	0.8%	0	0	$583,880	0.0%
Sub Total	13	10.7%	1	1	$17,277,362	1.6%
INCORRECT OPERATION
OVERFILL/OVERFLOW OF TANK/VESSEL/SUMP	1	0.8%	0	0	$28,978,502	2.7%
INCORRECT VALVE POSITION	3	2.4%	0	0	$131,703	0.0%
PIPELINE/EQUIPMENT OVERPRESSURED	6	4.9%	0	0	$6,516,114	0.6%
OTHER INCORRECT OPERATION	5	4.1%	0	3	$21,317,154	2.0%
Sub Total	15	12.4%	0	3	$56,943,475	5.4%
MAT'L/WELD/EQUIP FAILURE
CONSTRUCTION, INSTALLATION OR FABRICATION-RELATED	14	11.5%	0	0	$4,192,846	0.4%
MANUFACTURING-RELATED	6	4.9%	0	0	$7,787,941	0.7%
ENVIRONMENTAL CRACKING-RELATED	3	2.4%	0	0	$831,314,311	79.2%
MALFUNCTION OF CONTROL/RELIEF EQUIPMENT	4	3.3%	0	0	$1,504,526	0.1%
PUMP/COMPRESSOR-RELATED EQUIPMENT	3	2.4%	0	0	$174,301	0.0%
THREADED CONNECTION/COUPLING FAILURE	2	1.6%	0	0	$316,913	0.0%
NON-THREADED CONNECTION FAILURE	5	4.1%	0	0	$1,219,167	0.1%
DEFECTIVE OR LOOSE TUBING/FITTING	3	2.4%	0	0	$441,090	0.0%
FAILURE OF EQUIPMENT BODY	3	2.4%	0	0	$850,753	0.0%
OTHER EQUIPMENT FAILURE	6	4.9%	0	0	$1,635,187	0.1%
Sub Total	49	40.5%	0	0	$849,437,039	80.9%
NATURAL FORCE DAMAGE
EARTH MOVEMENT	1	0.8%	0	0	$111,206	0.0%
HEAVY RAINS/FLOODS	1	0.8%	0	0	$1,904,415	0.1%
TEMPERATURE	5	4.1%	0	0	$623,345	0.0%
OTHER NATURAL FORCE DAMAGE	1	0.8%	0	0	$522,239	0.0%
Sub Total	8	6.6%	0	0	$3,161,207	0.3%
OTHER OUTSIDE FORCE DAMAGE
VEHICLE NOT ENGAGED IN EXCAVATION	2	1.6%	0	0	$6,532,140	0.6%
ELECTRICAL ARCING FROM OTHER EQUIPMENT/FACILITY	2	1.6%	0	0	$42,765,308	4.0%
OTHER OUTSIDE FORCE DAMAGE	1	0.8%	0	0	$2,201,286	0.2%
Sub Total	5	4.1%	0	0	$51,498,735	4.9%
ALL OTHER CAUSES
MISCELLANEOUS CAUSE	4	3.3%	0	0	$384,625	0.0%
UNKNOWN CAUSE	1	0.8%	0	0	$49,003,154	4.6%
Sub Total	5	4.1%	0	0	$49,387,780	4.7%
Totals	121	100.0%	1	4	$1,048,782,497	100.0%

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National Hazardous Liquid Onshore: Significant Incident Details: 2010

Reported Cause of Incident (B)	Number	%	Fatalities	Injuries	Property Damage (D) (E)	% of Property Damage
CORROSION
EXTERNAL CORROSION	13	10.7%	0	0	$17,698,173	1.6%
INTERNAL CORROSION	13	10.7%	0	0	$3,378,723	0.3%
Sub Total	26	21.4%	0	0	$21,076,897	2.0%
EXCAVATION DAMAGE
OPERATOR/CONTRACTOR EXCAVATION DAMAGE	2	1.6%	0	0	$92,262	0.0%
THIRD PARTY EXCAVATION DAMAGE	10	8.2%	1	1	$16,601,218	1.5%
PREVIOUS DAMAGE DUE TO EXCAVATION	1	0.8%	0	0	$583,880	0.0%
Sub Total	13	10.7%	1	1	$17,277,362	1.6%
INCORRECT OPERATION
OVERFILL/OVERFLOW OF TANK/VESSEL/SUMP	1	0.8%	0	0	$28,978,502	2.7%
INCORRECT VALVE POSITION	1	0.8%	0	0	$131,703	0.0%
PIPELINE/EQUIPMENT OVERPRESSURED	6	4.9%	0	0	$6,516,114	0.6%
OTHER INCORRECT OPERATION	5	4.1%	0	3	$21,317,154	2.0%
Sub Total	13	10.7%	0	3	$56,943,475	5.4%
MAT'L/WELD/EQUIP FAILURE
CONSTRUCTION, INSTALLATION OR FABRICATION-RELATED	14	11.5%	0	0	$4,192,846	0.4%
MANUFACTURING-RELATED	6	4.9%	0	0	$7,787,941	0.7%
ENVIRONMENTAL CRACKING-RELATED	3	2.4%	0	0	$831,314,311	79.2%
MALFUNCTION OF CONTROL/RELIEF EQUIPMENT	3	2.4%	0	0	$447,655	0.0%
PUMP/COMPRESSOR-RELATED EQUIPMENT	3	2.4%	0	0	$174,301	0.0%
THREADED CONNECTION/COUPLING FAILURE	2	1.6%	0	0	$316,913	0.0%
NON-THREADED CONNECTION FAILURE	5	4.1%	0	0	$1,219,167	0.1%
DEFECTIVE OR LOOSE TUBING/FITTING	3	2.4%	0	0	$441,090	0.0%
FAILURE OF EQUIPMENT BODY	3	2.4%	0	0	$850,753	0.0%
OTHER EQUIPMENT FAILURE	6	4.9%	0	0	$1,635,187	0.1%
Sub Total	48	39.6%	0	0	$848,380,168	80.8%
NATURAL FORCE DAMAGE
EARTH MOVEMENT	1	0.8%	0	0	$111,206	0.0%
HEAVY RAINS/FLOODS	1	0.8%	0	0	$1,904,415	0.1%
TEMPERATURE	5	4.1%	0	0	$623,345	0.0%
OTHER NATURAL FORCE DAMAGE	1	0.8%	0	0	$522,239	0.0%
Sub Total	8	6.6%	0	0	$3,161,207	0.3%
OTHER OUTSIDE FORCE DAMAGE
VEHICLE NOT ENGAGED IN EXCAVATION	2	1.6%	0	0	$6,532,140	0.6%
ELECTRICAL ARCING FROM OTHER EQUIPMENT/FACILITY	2	1.6%	0	0	$42,765,308	4.0%
Sub Total	4	3.3%	0	0	$49,297,449	4.7%
ALL OTHER CAUSES
MISCELLANEOUS CAUSE	4	3.3%	0	0	$384,625	0.0%
UNKNOWN CAUSE	1	0.8%	0	0	$49,003,154	4.6%
Sub Total	5	4.1%	0	0	$49,387,780	4.7%
Totals	117	96.6%	1	4	$1,045,524,339	99.6%

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National Hazardous Liquid Offshore: Significant Incident Details: 2010

Reported Cause of Incident (B)	Number	%	Fatalities	Injuries	Property Damage (D) (E)	% of Property Damage
INCORRECT OPERATION
INCORRECT VALVE POSITION	2	1.6%	0	0	$0	0.0%
Sub Total	2	1.6%	0	0	$0	0.0%
MAT'L/WELD/EQUIP FAILURE
MALFUNCTION OF CONTROL/RELIEF EQUIPMENT	1	0.8%	0	0	$1,056,870	0.1%
Sub Total	1	0.8%	0	0	$1,056,870	0.1%
OTHER OUTSIDE FORCE DAMAGE
OTHER OUTSIDE FORCE DAMAGE	1	0.8%	0	0	$2,201,286	0.2%
Sub Total	1	0.8%	0	0	$2,201,286	0.2%
Totals	4	3.3%	0	0	$3,258,157	0.3%

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• All Gas Transmission Systems
• Onshore Only
• Offshore Only

National Gas Transmission: Significant Incident Details: 2010

Reported Cause of Incident (B)	Number	%	Fatalities	Injuries	Property Damage (D) (E)	% of Property Damage
CORROSION
EXTERNAL CORROSION	8	10.1%	0	0	$3,504,721	0.8%
INTERNAL CORROSION	17	21.5%	0	0	$9,236,685	2.2%
Sub Total	25	31.6%	0	0	$12,741,407	3.0%
EXCAVATION DAMAGE
OPERATOR/CONTRACTOR EXCAVATION DAMAGE	1	1.2%	0	0	$209,396	0.0%
THIRD PARTY EXCAVATION DAMAGE	8	10.1%	2	7	$2,613,724	0.6%
PREVIOUS DAMAGE DUE TO EXCAVATION	1	1.2%	0	0	$121,942	0.0%
Sub Total	10	12.6%	2	7	$2,945,063	0.7%
INCORRECT OPERATION
INCORRECT VALVE POSITION	1	1.2%	0	0	$273,403	0.0%
INCORRECT INSTALLATION	1	1.2%	0	0	$132,436	0.0%
OTHER INCORRECT OPERATION	1	1.2%	0	0	$500,313	0.1%
Sub Total	3	3.8%	0	0	$906,152	0.2%
MAT'L/WELD/EQUIP FAILURE
CONSTRUCTION, INSTALLATION OR FABRICATION-RELATED	7	8.8%	0	0	$2,326,485	0.5%
MANUFACTURING-RELATED	6	7.5%	8	51	$385,253,318	92.7%
MALFUNCTION OF CONTROL/RELIEF EQUIPMENT	2	2.5%	0	0	$312,716	0.0%
PUMP/COMPRESSOR-RELATED EQUIPMENT	1	1.2%	0	0	$312,277	0.0%
THREADED CONNECTION/COUPLING FAILURE	4	5.0%	0	0	$1,141,890	0.2%
FAILURE OF EQUIPMENT BODY	2	2.5%	0	0	$2,840,158	0.6%
OTHER EQUIPMENT FAILURE	3	3.8%	0	1	$474,822	0.1%
Sub Total	25	31.6%	8	52	$392,661,669	94.5%
NATURAL FORCE DAMAGE
LIGHTNING	1	1.2%	0	0	$363,655	0.0%
TEMPERATURE	1	1.2%	0	0	$158,542	0.0%
OTHER NATURAL FORCE DAMAGE	1	1.2%	0	0	$273,258	0.0%
Sub Total	3	3.8%	0	0	$795,457	0.1%
OTHER OUTSIDE FORCE DAMAGE
VEHICLE NOT ENGAGED IN EXCAVATION	2	2.5%	0	0	$236,362	0.0%
FISHING OR MARITIME ACTIVITY	1	1.2%	0	0	$2,096,730	0.5%
OTHER OUTSIDE FORCE DAMAGE	1	1.2%	0	0	$162,248	0.0%
Sub Total	4	5.0%	0	0	$2,495,341	0.6%
ALL OTHER CAUSES
MISCELLANEOUS CAUSE	6	7.5%	0	1	$2,403,812	0.5%
UNKNOWN CAUSE	3	3.8%	0	1	$503,083	0.1%
Sub Total	9	11.3%	0	2	$2,906,895	0.7%
Totals	79	100.0%	10	61	$415,451,987	100.0%

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National Gas Transmission Onshore: Significant Incident Details: 2010

Reported Cause of Incident (B)	Number	%	Fatalities	Injuries	Property Damage (D) (E)	% of Property Damage
CORROSION
EXTERNAL CORROSION	7	8.8%	0	0	$3,325,355	0.8%
INTERNAL CORROSION	3	3.8%	0	0	$2,294,542	0.5%
Sub Total	10	12.6%	0	0	$5,619,898	1.3%
EXCAVATION DAMAGE
OPERATOR/CONTRACTOR EXCAVATION DAMAGE	1	1.2%	0	0	$209,396	0.0%
THIRD PARTY EXCAVATION DAMAGE	8	10.1%	2	7	$2,613,724	0.6%
PREVIOUS DAMAGE DUE TO EXCAVATION	1	1.2%	0	0	$121,942	0.0%
Sub Total	10	12.6%	2	7	$2,945,063	0.7%
INCORRECT OPERATION
INCORRECT VALVE POSITION	1	1.2%	0	0	$273,403	0.0%
INCORRECT INSTALLATION	1	1.2%	0	0	$132,436	0.0%
OTHER INCORRECT OPERATION	1	1.2%	0	0	$500,313	0.1%
Sub Total	3	3.8%	0	0	$906,152	0.2%
MAT'L/WELD/EQUIP FAILURE
CONSTRUCTION, INSTALLATION OR FABRICATION-RELATED	7	8.8%	0	0	$2,326,485	0.5%
MANUFACTURING-RELATED	4	5.0%	8	51	$384,124,795	92.4%
MALFUNCTION OF CONTROL/RELIEF EQUIPMENT	2	2.5%	0	0	$312,716	0.0%
PUMP/COMPRESSOR-RELATED EQUIPMENT	1	1.2%	0	0	$312,277	0.0%
THREADED CONNECTION/COUPLING FAILURE	4	5.0%	0	0	$1,141,890	0.2%
FAILURE OF EQUIPMENT BODY	2	2.5%	0	0	$2,840,158	0.6%
OTHER EQUIPMENT FAILURE	2	2.5%	0	1	$269,573	0.0%
Sub Total	22	27.8%	8	52	$391,327,897	94.1%
NATURAL FORCE DAMAGE
LIGHTNING	1	1.2%	0	0	$363,655	0.0%
TEMPERATURE	1	1.2%	0	0	$158,542	0.0%
Sub Total	2	2.5%	0	0	$522,198	0.1%
OTHER OUTSIDE FORCE DAMAGE
VEHICLE NOT ENGAGED IN EXCAVATION	2	2.5%	0	0	$236,362	0.0%
OTHER OUTSIDE FORCE DAMAGE	1	1.2%	0	0	$162,248	0.0%
Sub Total	3	3.8%	0	0	$398,610	0.1%
ALL OTHER CAUSES
MISCELLANEOUS CAUSE	5	6.3%	0	1	$1,950,935	0.4%
UNKNOWN CAUSE	2	2.5%	0	1	$372,564	0.0%
Sub Total	7	8.8%	0	2	$2,323,499	0.5%
Totals	57	72.1%	10	61	$404,043,319	97.2%

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National Gas Transmission Offshore: Significant Incident Details: 2010

Reported Cause of Incident (B)	Number	%	Fatalities	Injuries	Property Damage (D) (E)	% of Property Damage
CORROSION
EXTERNAL CORROSION	1	1.2%	0	0	$179,365	0.0%
INTERNAL CORROSION	14	17.7%	0	0	$6,942,143	1.6%
Sub Total	15	18.9%	0	0	$7,121,509	1.7%
MAT'L/WELD/EQUIP FAILURE
MANUFACTURING-RELATED	2	2.5%	0	0	$1,128,523	0.2%
OTHER EQUIPMENT FAILURE	1	1.2%	0	0	$205,249	0.0%
Sub Total	3	3.8%	0	0	$1,333,772	0.3%
NATURAL FORCE DAMAGE
OTHER NATURAL FORCE DAMAGE	1	1.2%	0	0	$273,258	0.0%
Sub Total	1	1.2%	0	0	$273,258	0.0%
OTHER OUTSIDE FORCE DAMAGE
FISHING OR MARITIME ACTIVITY	1	1.2%	0	0	$2,096,730	0.5%
Sub Total	1	1.2%	0	0	$2,096,730	0.5%
ALL OTHER CAUSES
MISCELLANEOUS CAUSE	1	1.2%	0	0	$452,876	0.1%
UNKNOWN CAUSE	1	1.2%	0	0	$130,518	0.0%
Sub Total	2	2.5%	0	0	$583,395	0.1%
Totals	22	27.8%	0	0	$11,408,667	2.7%

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National Gas Gathering: Significant Incident Details: 2010

Reported Cause of Incident (B)	Number	%	Fatalities	Injuries	Property Damage (D) (E)	% of Property Damage
CORROSION
INTERNAL CORROSION	3	50.0%	0	0	$2,560,105	78.0%
Sub Total	3	50.0%	0	0	$2,560,105	78.0%
MAT'L/WELD/EQUIP FAILURE
MALFUNCTION OF CONTROL/RELIEF EQUIPMENT	1	16.6%	0	0	$111,722	3.4%
THREADED CONNECTION/COUPLING FAILURE	1	16.6%	0	0	$159,167	4.8%
Sub Total	2	33.3%	0	0	$270,889	8.2%
OTHER OUTSIDE FORCE DAMAGE
OTHER OUTSIDE FORCE DAMAGE	1	16.6%	0	0	$450,853	13.7%
Sub Total	1	16.6%	0	0	$450,853	13.7%
Totals	6	100.0%	0	0	$3,281,848	100.0%

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National Gas Distribution: Significant Incident Details: 2010

Reported Cause of Incident (B)	Number (C)	%	Fatalities	Injuries	Property Damage (D) (E)	% of Property Damage
CORROSION
EXTERNAL CORROSION	3	5.5%	0	2	$185,348	1.0%
Sub Total	3	5.5%	0	2	$185,348	1.0%
EXCAVATION DAMAGE
OPERATOR/CONTRACTOR EXCAVATION DAMAGE	1	1.8%	0	0	$205,501	1.1%
THIRD PARTY EXCAVATION DAMAGE	11	20.3%	2	3	$2,082,808	11.6%
Sub Total	12	22.2%	2	3	$2,288,309	12.8%
INCORRECT OPERATION
DAMAGE BY OPERATOR OR OPERATOR'S CONTRACTOR	2	3.7%	1	1	$33,035	0.1%
INCORRECT VALVE POSITION	1	1.8%	0	0	$1,103,973	6.1%
INCORRECT INSTALLATION	1	1.8%	0	1	$81,674	0.4%
OTHER INCORRECT OPERATION	5	9.2%	1	10	$513,105	2.8%
Sub Total	9	16.6%	2	12	$1,731,789	9.6%
MAT'L/WELD/EQUIP FAILURE
BODY OF PIPE	2	3.7%	0	5	$470,716	2.6%
MECHANICAL FITTING	1	1.8%	1	1	$0	0.0%
OTHER PIPE/WELD/JOINT FAILURE	1	1.8%	0	1	$141,394	0.7%
NON-THREADED CONNECTION FAILURE	1	1.8%	0	0	$132,780	0.7%
Sub Total	5	9.2%	1	7	$744,891	4.1%
NATURAL FORCE DAMAGE
EARTH MOVEMENT	1	1.8%	0	0	$513,416	2.8%
HEAVY RAINS/FLOODS	1	1.8%	0	0	$97,490	0.5%
LIGHTNING	1	1.8%	0	0	$176,666	0.9%
TEMPERATURE	1	1.8%	0	1	$255,224	1.4%
Sub Total	4	7.4%	0	1	$1,042,797	5.8%
OTHER OUTSIDE FORCE DAMAGE
VEHICLE NOT ENGAGED IN EXCAVATION	5	9.2%	0	2	$558,368	3.1%
ELECTRICAL ARCING FROM OTHER EQUIPMENT/FACILITY	2	3.7%	0	3	$694,187	3.8%
OTHER OUTSIDE FORCE DAMAGE	4	7.4%	0	0	$766,106	4.2%
Sub Total	11	20.3%	0	5	$2,018,661	11.2%
ALL OTHER CAUSES
MISCELLANEOUS CAUSE	3	5.5%	0	5	$6,251,903	34.9%
UNKNOWN CAUSE	7	12.9%	3	4	$3,620,222	20.2%
Sub Total	10	18.5%	3	9	$9,872,126	55.2%
Totals	54	100.0%	8	39	$17,883,925	100.0%

Export Table

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.