ANR PIPELINE CO — Gas transmission and gathering — incident on 2012-02-06

Gas transmission and gathering incident. Reported cause: CORROSION FAILURE. Reported consequences: 0 fatalities, 0 injuries, 1000 NATURAL GAS released, $140,000 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: 20120024.

Operator ID: 405.

Reported incident date: 2/6/2012 15:00.

Cause detail: INTERNAL CORROSION

Cause detail: AT EI 199 A ATMOSPHERIC BOLT ON CLAMP INSTALLED IN OCTOBER 2003 HAS DEVELOPED A LEAK AT THE SEAM EDGE OF THE CLAMP. THE CLAMP IS INSTALLED ON AN 8" DEAD LEG SECTION OF PIPE. TO ISOLATE THE CLAMPED SECTION OF PIPE THE ENTIRE 737 20" PIPELINE WILL HAVE TO BE ISOLATED AND BLOWDOWN. A REPAIR PROCEDURE WAS DEVELOPED. IN JULY 2012, A SECTION OF THE LINE WAS REMOVED, AND THE REMAINING PIPE SEGEMENT WAS BLINDED OFF. THE PROJECT IS COMPLETE.

PHMSA trend classification: significant incident, not serious.

PHMSA standardized cause: CORROSION — INTERNAL.

PHMSA indexed costs: $170,000 reported total cost, $95,706.903 in 1984 dollars, $215,072.4 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.