J - W GATHERING CO — Gas transmission and gathering — incident on 2012-06-20

Gas transmission and gathering incident in SHREVEPORT, CADDO County, LA. Reported cause: EXCAVATION DAMAGE. Reported consequences: 0 fatalities, 0 injuries, 7179 NATURAL GAS released, $20,000 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: 20120073.

Operator ID: 9011.

Reported incident date: 6/20/2012 1:36.

Location detail: 06+78

Cause detail: PREVIOUS DAMAGE DUE TO EXCAVATION ACTIVITY

Cause detail: MISCELLANEOUS ROOT CAUSES

Cause detail: PREVIOUS DAMAGE

Cause detail: A BURIED SIX INCH NATURAL GAS GATHERING PIPELINE RUPTURED. THE RUPTURE CAUSED NATURAL GAS TO ESCAPE THE PIPELINE AND VENT TO ATMOSHPERE. COMPANY PERSONNEL RESPONDED TO SCADA ALARMS AND IDENTIFIED THE FAILURE. THE EFFECTED PIPE SEGMENT WAS ISLOLATED AND DEPRESSURIZED. THE FAILED SEGMENT OF PIPE WAS REPLACED, AND THE PIPELINE WAS PLACED BACK IN SERVICE AT APPROXIMATELY 16:00 THE SAME DATE. THE AFFECTED SEGMENT WAS SENT TO THE LAB FOR ANALYSIS. THERE WAS, WHAT APPEARED TO BE, DAMAGE TO THE OUTSIDE OF THE PIPE FROM A PREVIOUS (THIRD PARTY) EXCAVATION. THERE IS NO RECORD OF THE INCIDENT OR EXCAVATION THAT MAY HAVE CAUSED THE DAMAGE. SUPPLENTAL REPORT: THE LAB ANALYSIS CONCLUDED: 1. THE OUTSIDE OF THE PIPE EXHIBITED TWO LONGITUDINAL BANDS OF GOUGES. THE RUPTURE RAN ALONG THE EDGE OF ONE BAND, AND THEN CONTINUED AT EACH END IN A CIRCUMFERENTIAL DIRECTION. 2. THE WALL THICKNESS WAS SATISFACTORY AWAY FROM THE RUPTURE AND ALONG ONE SIDE OF IT, BUT ON THE OTHER SIDE OF THE RUPTURE, THE WALL THICKNESS WAS 0.010 TO 0.035 INCH THINNER, DUE TO CORROSION AS A RESULT OF DAMAGE TO THE PROTECTIVE COATING AND THE SUBSEQUENT EXPOSURE TO THE ENVIRONMENT. 3. DIAMETER MEASUREMENTS AT THE RUPTURE AND AWAY FROM IT INDICATED THAT THE PIPE HAD NOT SWOLLEN BEFORE RUPTURING. 4. AN API TENSION TEST SHOWED SATISFACTORY YIELD AND TENSILE STRENGTHS.

PHMSA trend classification: not significant, not serious.

PHMSA standardized cause: EXCAVATION DAMAGE — PREVIOUS DAMAGE DUE TO EXCAVATION.

PHMSA indexed costs: $34,500 reported total cost, $22,642.879 in 1984 dollars, $40,809.865 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.