DTE GAS COMPANY — Gas transmission and gathering — incident on 2018-12-30

Gas transmission and gathering incident in DEERFIELD TOWNSHIP, LIVINGSTON COUNTY County, MI. Reported cause: EQUIPMENT FAILURE. Reported consequences: 0 fatalities, 0 injuries, 14700 NATURAL GAS released, $15,000 reported property damage. Operator-reported incident data submitted to PHMSA, generally within 30 days. Records may be supplemented or corrected and do not represent final agency causal findings.

Report number: 20190012.

Operator ID: 12408.

Reported incident date: 12/30/2018 0:22.

Location detail: MLV 9

Cause detail: MALFUNCTION OF CONTROL/RELIEF EQUIPMENT

Cause detail: DTE GAS DISPATCH RECEIVED A CALL FROM A CUSTOMER AT 00:22 OF AN ODOR IN AIR NEAR MAIN LINE VALVE 9 AT E. COHOCTAH RD. AND LUTZ RD. GAS DISPATCH CONTACTED GAS CONTROL AND THEY CONTACTED OPERATIONS. OPERATIONS SENT AN EMPLOYEE TO MLV 9 TO INVESTIGATE AND THE EMPLOYEE DISCOVERED THE RELIEF VALVE NORTH OF MLV 9 ON THE C LINE RELIEVING GAS TO ATMOSPHERE. THE TECHNICIAN CLOSED THE BLOCK VALVE UNDER THE RELIEF VALVE TO STOP THE BLOWING GAS. THE TECHNICIAN DID NOT OBSERVE ANY APPARENT PHYSICAL DAMAGE TO THE RELIEF. THE C LINE (MAOP 844) WAS MADE "COMMON" WITH THE A & B LINES (MAOP 811) AND THE ALARM POINT FOR THE C LINE WAS LOWERED TO 811 THUS PROTECTING THE C LINE UNTIL PERMANENT REPAIRS CAN BE MADE. THE CAUSE OF FAILURE (RELIEF VALVE) WAS DUE MATERIAL FAILURE. A NEW VALVE WAS INSTALLED ON 5/29/2019 AND THE C-LINE WAS RETURNED TO SERVICE WITH AN ALARM POINT AT 844 MAOP.

PHMSA trend classification: significant incident, not serious.

PHMSA standardized cause: EQUIPMENT FAILURE — MALFUNCTION OF CONTROL/RELIEF EQUIPMENT.

PHMSA indexed costs: $63,085 reported total cost, $51,926.009 in 1984 dollars, $72,788.185 in current-year dollars.

PHMSA trend flags, standardized causes, and indexed costs are analytical fields added to operator-reported incident data. They do not represent final agency causal findings.