# SOUTHERN NATURAL GAS CO — Gas transmission and gathering — incident on 2015-04-09

- **operation:** document
- **citation:** PHMSA Report 20150061
- **title:** SOUTHERN NATURAL GAS CO — Gas transmission and gathering — incident on 2015-04-09
- **source type:** incident
- **agency:** Pipeline and Hazardous Materials Safety Administration
- **status:** historical
- **official:** true
- **published on:** 2015-05-01
- **effective on:** 2015-04-09
- **summary:** Gas transmission and gathering incident in Not Within a Municipality, ST MARTIN PARISH County, LA. Reported cause: OTHER INCIDENT CAUSE. Reported consequences: 0 fatalities, 0 injuries, 41 NATURAL GAS released, $71,462 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. PHMSA trend classification: not significant, not serious.
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**body:**

Gas transmission and gathering incident in Not Within a Municipality, ST MARTIN PARISH County, LA. Reported cause: OTHER INCIDENT CAUSE. Reported consequences: 0 fatalities, 0 injuries, 41 NATURAL GAS released, $71,462 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: 20150061.

Operator ID: 18516.

Reported incident date: 4/9/2015 14:10.

Location detail: MP 0.4

Cause detail: UNKNOWN

Cause detail: AT 2:10 PM ON APRIL 9, 2015, A NATURAL GAS LEAK WAS IDENTIFIED BY COMPANY EMPLOYEES IN THE PIPELINE CANAL OF THE SNG 10-INCH BAYOU POSTILLION LINE, LOCATED IN ST. MARY PARISH, LOUISIANA. THE LEAK WAS CONFIRMED AT 10:40 AM ON 4/10/15, BY DEPRESSURIZING LINE AND THE SUBSIDENCE OF BUBBLES. MAY 8, 2015: AN ULTRASONIC TEST WAS PERFORMED BY THE DIVE CREW TO DETERMINE IF THERE WAS SIGNIFICANT WALL LOSS ON THE PIPE. THE UT READINGS DID NOT INDICATE SIGNIFICANT WALL LOSS. THE DIVERS WERE ABLE TO DETERMINE THE LEAK LOCATION AT THE 7 O'CLOCK POSITION. THE LEAK WAS A PINHOLE LEAK MEASURING NO MORE THAN 1/32-INCHES. REPAIRS WERE MADE AND COMPLETED BY INSTALLING A CLAMP OVER THE AREA OF THE LEAK. THE LINE HAS BEEN RETURNED TO SERVICE.

PHMSA trend classification: not significant, not serious.

PHMSA standardized cause: ALL OTHER CAUSES — UNKNOWN.

PHMSA indexed costs: $72,852 reported total cost, $36,781.491 in 1984 dollars, $89,951.752 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.
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