QUESTAR PIPELINE COMPANY — Gas transmission and gathering — incident on 2011-11-27

Gas transmission and gathering incident in NEAR LYMAN, UINTA County, WY. Reported cause: EQUIPMENT FAILURE. Reported consequences: 0 fatalities, 0 injuries, 5400 NATURAL GAS released, $500 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: 20110398.

Operator ID: 12874.

Reported incident date: 11/27/2011 13:10.

Location detail: MP 3.9

Cause detail: OTHER EQUIPMENT FAILURE

Cause detail: SUPPLEMENTAL BEING FILED TO CLARIFY THE CAUSE OF THE INCIDENT. TUBING FOR A SENSING LINE TO A PRESSURE TRANSDUCER WAS INADEQUATELY SECURED DURING INITIAL INSTALLATION AND BROKE FREE FROM ITS CONNECTION POINT BECAUSE OF PROLONGED VIBRATION FROM NORMAL OPERATION. LOCAL OPERATOR RESPONDED AND ISOLATED THE SENSING LINE VALVES. THE OPERATOR REPAIRED THE TUBING AND REPORTED THE EVENT TO QUESTAR PIPELINE COMPANY'S GAS CONTROL. AFTER GAS LOSS CALCULATIONS WERE MADE IT WAS DETERMINED THAT THIS EVENT MET THE CRITERIA OF AN UNINTENTIONAL RELEASE OF GAS IN EXCESS OF 3 MMSCF AND THE EVENT WAS REPORTED TO THE NRC.

PHMSA trend classification: not significant, not serious.

PHMSA standardized cause: EQUIPMENT FAILURE — OTHER EQUIPMENT FAILURE.

PHMSA indexed costs: $20,300 reported total cost, $14,110.256 in 1984 dollars, $17,855.102 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.