# PUBLIC SERVICE CO OF COLORADO — Gas transmission and gathering — incident on 2012-11-11

- **operation:** document
- **citation:** PHMSA Report 20120123
- **title:** PUBLIC SERVICE CO OF COLORADO — Gas transmission and gathering — incident on 2012-11-11
- **source type:** incident
- **agency:** Pipeline and Hazardous Materials Safety Administration
- **status:** historical
- **official:** true
- **published on:** 2012-12-11
- **effective on:** 2012-11-11
- **summary:** Gas transmission and gathering incident in SILVERTHORNE, SUMMIT County, CO. Reported cause: CORROSION FAILURE. Reported consequences: 0 fatalities, 0 injuries, 3989 NATURAL GAS released, $51,786 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 SILVERTHORNE, SUMMIT County, CO. Reported cause: CORROSION FAILURE. Reported consequences: 0 fatalities, 0 injuries, 3989 NATURAL GAS released, $51,786 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: 20120123.

Operator ID: 15931.

Reported incident date: 11/11/2012 15:00.

Location detail: 3328+18.55

Cause detail: EXTERNAL CORROSION

Cause detail: ON 11/11/12 AT APPROXIMATELY 15:00 THERE WAS AN UNINTENTIONAL RELEASE OF 3,989 MCF (SEE PART A, #10) OF NATURAL GAS FROM AN 8 INCH STEEL TRANSMISSION LINE, OPERATING AT 752 PSIG. SERVICE WAS SHUT DOWN AT APPROXIMATELY 17:00 ON 11/11/12 AND RESTORED ON 11/12/12 AT APPROXIMATELY 09:00. THE RUPTURE WAS CAUSED BY EXTERNAL GALVANIC CORROSION ATTRIBUTED TO A COATING FLAW (A HOLIDAY OR DISBONDED REGION) THAT ERODED WALL THICKNESS BELOW THRESHOLD TO CONTAIN OPERATION PRESSURE.

PHMSA trend classification: not significant, not serious.

PHMSA standardized cause: CORROSION — EXTERNAL.

PHMSA indexed costs: $67,786 reported total cost, $40,637.208 in 1984 dollars, $83,577.54 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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