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DTE GAS COMPANY

gas_transmission Incident — — June 30, 2019

Incident Information

Incident DateJune 30, 2019
OperatorDTE GAS COMPANY
CommodityNATURAL GAS
Pipeline Typegas_transmission

Location

State
Coordinates43.95778, -86.18653

Cause

CauseCORROSION FAILURE
SubcauseEXTERNAL CORROSION

Casualties

Fatalities0
Injuries0

Costs

Property Damage$97,218
Emergency Response$37,985
Other Costs$27,914

Location Map

Incident Narrative

A VERBAL NOTIFICATION REGARDING A LEAK ON THE 16' LOREED-LUDINGTON TRANSMISSION LINE FOR DTE GAS WAS MADE TO THE MPSC AND NRC. THE LEAK WAS FOUND BY A LANDOWNER AND THE DTE CREW WAS DISPATCHED AT 10:20 PM ON 6/30/2019. DTE GAS LOWERED THE PRESSURE OF THE LINE AS OF 12:18 AM ON 7/1/2019 AND PRESSURE CONTROL PROCEDURE AND A REPAIR PLAN ARE BEING DEVELOPED. APPROXIMATELY 5.5 FEET SECTION WAS REPLACED AND THE PIPE SECTION IS UNDERGOING A FAILURE INVESTIGATION BY A THIRD PARTY LABORATORY. MPSC, JIM JOHNSON, WAS NOTIFIED AT 12:30 AM AND WE HAD A FOLLOW-UP DISCUSSION AT APPROXIMATELY 12:53 AM. THE NRC WAS NOTIFIED AT 12:28 AM AND THE INCIDENT NUMBER IS 1250615. THE LINE WAS RETURNED TO SERVICE ON 7/4/2019. KIEFNER PERFORMED AN INVESTIGATION OF THE CAUSE OF THE LEAK. THE REPORT WAS DATED AUGUST 29, 2019. THE SUMMARY AND CONCLUSION OF THE REPORT STATED ""THE LEAK THAT OCCURRED ON THE LOREED-LUDINGTON PIPELINE IN THE MLV 4-5 VALVE SECTION ON JUNE 30, 2019 WAS LIKELY CAUSED BY CORROSION WHICH THINNED THE PIPE WALL THICKNESS TO THE POINT THAT THE REMAINING LIGAMENT WAS UNABLE TO SUPPORT THE STRESS INDUCED BY THE INTERNAL PRESSURE. THE FAILURE OF THE PIPE WALL WAS BY DUCTILE TEARING AND THE APPEARANCE OF A CRACK-LIKE FEATURE WAS CAUSED BY THE LOCALIZED NECKING OF THE MATERIAL JUST PRIOR TO TEARING. AN AREA OF COATING DAMAGE AND DISBONDMENT, WHICH CAUSED CATHODIC SHIELDING OF THE PIPE MATERIAL, LIKELY ENABLED THE CORROSION TO OCCUR. THE PRESENCE OF A TWO PART FULL-ENCIRCLEMENT SWAMP WEIGHT OVER THE LEAK LOCATION LIKELY CONTRIBUTED TO THE CONDITIONS WHICH WOULD BE NECESSARY FOR DISBANDED COATING TO SHIELD THE PIPE MATERIAL. THE TYPE OF CORROSION THAT OCCURRED AT THIS LOCATION CAN BE DESCRIBED AS 'UNDER DEPOSIT ACID ATTACK.' HOWEVER, THE EXACT CAUSE OF THE CORROSION WAS NOT IDENTIFIED. AN ANALYSIS OF THE CORROSION PRODUCTS FOR THE PRESENCE OF BACTERIA FOUND A LOW PRESENCE OF COMMON BACTERIA ASSOCIATED WITH PIPELINE CORROSION. PART D7.D ESTIMATED OTHER COSTS DESCIPTION: LUMPED COST OF FLEET, FACILITY, TRAVEL/MILEAGE, AND HOTEL COSTS FOR EVERYONE THAT WAS DEPLOYED ON SITE FOR THE WEEK OF THE INCIDENT.

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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