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CITIZENS GAS & COKE UTILITY

gas_transmission Incident —

Incident Information

Report Date—
OperatorCITIZENS GAS & COKE UTILITY
Commodity—
Pipeline Typegas_transmission

Location

State
Coordinates39.77895, -86.25075

Cause

CauseMATERIAL FAILURE OF PIPE OR WELD
Subcause—

Casualties

Fatalities0
Injuries0

Costs

Property Damage—
Lost Commodity—
Public/Private Damage—
Emergency Response—
Environmental Remediation—
Other Costs—

Location Map

Incident Narrative

A CRACK OCCURRED ON A 20"" NATURAL GAS TRANSMISSION PIPELINE. THERE WERE NO INJURIES, NO IGNITION AND NO PROPERTY DAMAGE AS A RESULT OF THIS FAILURE. APPROXIMATELY 560 MCF OF NATURAL GAS WAS RELEASED TO ATMOSPHERE, THIS INCLUDES INTENTIONAL AND UNINTENTIONAL. THE APPROXIMATE 10"" LINEAR CRACK IS IN THE PROXIMITY OF 3:00 ON THE 20"" CEG TRANSMISSION PIPELINE AND WAS WITHIN 1"" OF A4"" WELDED TIE IN. (NOT SURE ON THE NATURE OF THE CRACK, THE LAB ANALYSIS WILL HELP DETERMINE ROOT CAUSE.) THE SECTION OF PIPE, INCLUDING THE 4"" TIE IN, WAS REMOVED AND SENT FOR A LABORATORY ANALYSIS. LAB RESULTS INDICATED THE FOLLOWING: ""THE 20"" GAS MAIN FAILURE WAS CAUSED BY A SUDDEN OVERLOAD CONDITION. THIS INTRODUCED A THROUGH WALL CRACK IN THE LENGTHWISE DIRECTION AT THE 12 O'CLOCK LOCATION ADJACENT TO THE WELD JOINT BETWEEN THE MAIN LINE AND THE LATERAL LINE. THE CRACK INITIATED ON THE OD SURFACE AND PROPAGATED UNDER A FAST AND SUDDEN OVERLOAD CONDITION, AS INDICATED BY THE BRITTLE CLEAVAGE FRACTURE MORPHOLOGY. THIS IS CONSISTENT WITH THE SCENARIO IF THE 4"" LATERAL LINE IS IMPROPERLY SUPPORTED BY THE BACKFILL. THE PIPELINE HAS A SUCCESSFUL SERVICE HISTORY SINCE 1969. THE FAILURE OCCURRED AFTER A LENGTH OF 10' OF THE 4"" LATERAL PIPE WAS EXPOSED AND SUBJECTED TO SOIL REMOVAL AND REPLACEMENT. THE CRACK INITIATION POINT WOULD HAVE EXPERIENCED THE HIGHEST BENDING MOMENT TO INITIATE THE CRACK. OVERALL CONDITION OF THE GAS MAIN IS ACCEPTABLE WITHOUT ANY SIGNIFICANT ANOMALIES. CORROSION OR ANY OTHER ANOMALIES WERE NOTED WHICH COULD HAVE CONTRIBUTED TO THIS FAILURE. THE GAS MAIN IS IDENTIFIED TO BE A CARBON STEEL (AISI 1025) WITH A FERRITE/PEARLITE MICROSTRUCTURE; TYPICAL FOR GAS MAINS. THE PIPE ALSO MEETS THE REQUIRED SPECIFICATION ASTM A53 GRADE B. THE HARDNESS OF THE PIPE IS MEASURED AT ~80 ROCKWELL B WHICH IS AGAIN TYPICAL FOR THESE PIPES AND IS IN AGREEMENT WITH THE MICROSTRUCTURE. TENSILE AND CHARPY TESTING IS BEING PERFORMED AND WILL BE SUBMITTED IN THE MATERIAL ANALYSIS REPORT. WE DO NOT EXPECT ANY UNUSUAL TENSILE AND CHARPY TESTING RESULTS AS THE HARDNESS AND MICROSTRUCTURE IS TYPICAL OF THIS ALLOY.

About This Pipeline Incident

Pipeline incident data is reported to the Pipeline and Hazardous Materials Safety Administration (PHMSA). All significant incidents involving fatalities, injuries, or property damage over $50,000 must be reported.

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