ENTERPRISE PRODUCTS OPERATING LLC — Gas transmission and gathering — incident on 2011-05-26

Gas transmission and gathering incident in FLORESVILLE, WILSON County, TX. Reported cause: MATERIAL FAILURE OF PIPE OR WELD. Reported consequences: 0 fatalities, 0 injuries, 14395 NATURAL GAS released, $58,000 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: 20110202.

Operator ID: 31618.

Reported incident date: 5/26/2011 12:54.

Cause detail: ORIGINAL MANUFACTURING-RELATED (NOT GIRTH WELD OR OTHER WELDS FORMED IN THE FIELD)

Cause detail: LINE 9122 HWY 887 TO ADKINS RUPTURED AT APPROXIMATELY 12:54PM ON MAY 26, 2011. THE CONTROL CENTER WAS NOTIFIED BY A RANCHER THAT WAS IN THE VICINITY OF THE PIPELINE WHEN THE RUPTURE OCCURRED. FIELD OPERATIONS WAS IMMEDIATELY DISPATCHED TO THE INCIDENT. AT 13:30 FIELD OPERATIONS STARTED MAKING VALVE ISOLATIONS. COUNTY EMERGENCY RESPONSE PERSONNEL WERE ALREADY AT THE INCIDENT WHEN ENTERPRISE FIELD OPERATIONS ARRIVED. THE AREA WAS IMMEDIATELY SECURED. AFTER SECURING THE AREA, ENTERPRISE PRODUCTS STARTED AN INCIDENT INVESTIGATION AND THE PIPE ASSOCIATED WITH THE INCIDENT WAS SENT TO A METALLURGY LAB FOR ANALYSIS. SUPPLEMENTAL COMMENTS: METALLURGY TESTING AND ANALYSIS WAS CONDUCTED BY STORK METALLURGY AND TESTING IN HOUSTON, TX. THE RESULTS WERE INCONCLUSIVE. SUPPLEMENTAL COMMENTS 1-30-12 ENTERPRISE PRODUCTS HAS COMPLETED AN INLINE INSPECTION (MFL) ON THE NORTH SECTION OF LINE 9122, FROM HWY 887 TO THE END OF THE PIPELINE. THE NORTH SECTION WAS ALSO HYDROTESTED TO 1.5 TIMES MAOP. THE SOUTH SECTION OF THE PIPELINE WAS HYDROTESTED IN 2006 AS A PART OF THE INTEGRITY MANAGEMENT PROGRAM. MFL AND HYDROTEST DATA HAVE BEEN REVIEWED BY THE RAILROAD COMMISSION OF TEXAS AS A PART OF THEIR INVESTIGATION. ON COMPLETION OF THE HYDROTEST THE PIPELINE WAS RETURNED TO SERVICE AT IT'S ORIGINAL MAOP OF 612 PSIG. SUPPLEMENTAL FINAL 7-11-13 CORRECTED THE SMYS OF THE PIPELINE TO BE X46 IN PART C. SUPPLEMENT FINAL 9-24-13 CORRECTED THE APPARANT CAUSE IN PART G TO "MATERIAL FAILURE OF PIPE OR WELD" PER FURTHER DISCUSSION WITH PHMSA. SINCE THE TIME OF THE INCIDENT, BOTH AN ILI TOOL RUN AND HYDROTEST (PRESSURE TEST) HAVE BEEN CONDUCTED ON LINE 9122. THERE WAS ONE FAILURE DURING THE PRESSURE TEST AND THE METALLURGICAL ANALYSIS INDICATED THAT THE HYDROTEST FAILURE WAS CAUSED BY A "HOOK CRACK IN THE SEAM".

PHMSA trend classification: significant incident, not serious.

PHMSA standardized cause: MATERIAL FAILURE OF PIPE OR WELD — MANUFACTURING-RELATED.

PHMSA indexed costs: $115,580 reported total cost, $71,506.6 in 1984 dollars, $126,213.459 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.