TRUNKLINE GAS CO — Gas transmission and gathering — incident on 2015-03-05

Gas transmission and gathering incident in DYERSBURG, DYER County, TN. Reported cause: EQUIPMENT FAILURE. Reported consequences: 0 fatalities, 0 injuries, 21900 NATURAL GAS released, $13 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: 20150044.

Operator ID: 19730.

Reported incident date: 3/5/2015 12:39.

Location detail: 0.9

Cause detail: THREADED CONNECTION/COUPLING FAILURE

Cause detail: THERE WERE TWO SEPARATE RELEASES FROM THE SAME DEVICE RELATED TO THIS INCIDENT REPORT. LISTED BELOW ARE THE SPECIFICS FOR EACH RELEASE: PART A.10 - THE ESTIMATED VOLUME RELEASED UNINTENTIONALLY FOR THE FIRST RELEASE WAS 4.3 MMCF. THE ESTIMATED VOLUME RELEASED UNINTENTIONALLY FOR THE SECOND RELEASE WAS 17.6 MMCF. PART A.19.A - THE TIME THE OPERATOR IDENTIFIED THE FIRST RELEASE WAS 03:06. THE TIME THE OPERATOR IDENTIFIED THE SECOND RELEASE WAS 05:55. PART A.19.B - THE TIME THE OPERATOR RESOURCES ARRIVED ON SITE FOR THE FIRST RELEASE WAS 03:40. THE TIME THE OPERATOR RESOURCES ARRIVED ON SITE FOR THE SECOND RELEASE WAS 06:20. PART D.7.F - THE ESTIMATED COST OF THE GAS RELEASED FOR THE FIRST RELEASE WAS $14,061. THE ESTIMATED COST OF THE GAS RELEASED FOR THE SECOND RELEASE WAS $57,552. PART E.1 - THE ESTIMATED PRESSURE AT THE POINT AND TIME OF THE INCIDENT FOR THE FIRST RELEASE WAS 858 PSIG. THE ESTIMATED PRESSURE AT THE POINT AND TIME OF THE INCIDENT FOR THE SECOND RELEASE WAS 822 PSIG. PART G: APPARENT CAUSE: FOR THE FIRST RELEASE - PART G.6 EQUIPMENT FAILURE SUB-CAUSE - WAS THE RELIEF VALVE SOLENOID FROZE. FOR THE SECOND RELEASE - PART G.6.3 EQUIPMENT FAILURE SUB-CAUSE - WAS A PIPE NIPPLE FAILED.

PHMSA trend classification: significant incident, not serious.

PHMSA standardized cause: EQUIPMENT FAILURE — THREADED CONNECTION/COUPLING FAILURE.

PHMSA indexed costs: $71,626 reported total cost, $66,408.247 in 1984 dollars, $81,547.293 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.