GULF SOUTH PIPELINE COMPANY, LP — Gas transmission and gathering — incident on 2013-08-29

Gas transmission and gathering incident in CARTHAGE, PANOLA County, TX. Reported cause: INCORRECT OPERATION. Reported consequences: 0 fatalities, 0 injuries, 4971.2 NATURAL GAS released, $0 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: 20130082.

Operator ID: 31728.

Reported incident date: 8/29/2013 3:07.

Location detail: 296+67

Cause detail: OTHER INCORRECT OPERATION

Cause detail: SEE SECTION G7. AN ADDITIONAL RELIEF VALVE ACTUATED ON INDEX 59 WHICH DID NOT EXCEED THE MAOP OF THAT PIPELINE. THE DELAY IN MAKING THE NRC NOTIFICATION WASS DUE TO AN ERROR FOUND IN THE ORIGINAL GAS LOSS ESTIMATE. THE ORIGINAL ESTIMATE WAS MADE USING DATA FROM A CHECK METER. UNFORTUNATELY, PERSONNEL MAKING THE ESTIMATE DID NOT REALIZE THE CHECK METER WAS NOT FULLY MEASURING THE GAS LOSS. A SUBSEQUENT CALCULATION WAS MADE BASED ON THE TIME BOTH BLOW-OFFS WERE VENTING GAS. ONCE THE ERROR WAS RECOGNIZED, THE REPORT WAS MADE TO NRC. 3-11-14

PHMSA trend classification: not significant, not serious.

PHMSA standardized cause: INCORRECT OPERATION — OTHER INCORRECT OPERATION.

PHMSA indexed costs: $17,560 reported total cost, $14,108.336 in 1984 dollars, $17,552.827 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.