COLORADO INTERSTATE GAS CO — Gas transmission and gathering — incident on 2015-07-18

Gas transmission and gathering incident in BYERS, ARAPAHOE County, CO. Reported cause: EQUIPMENT FAILURE. Reported consequences: 0 fatalities, 0 injuries, 3600 NATURAL GAS released, $2,500 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: 20150102.

Operator ID: 2564.

Reported incident date: 7/18/2015 17:22.

Location detail: 1.0

Cause detail: OTHER EQUIPMENT FAILURE

Cause detail: A SOLENOID VALVE ON THE TOWER SWITCH VALVE FAILED, RENDERING THE AIR DRYER INOPERABLE. THIS ALLOWED WATER TO ENTER THE ESD SYSTEM CAUSING THE ESD VENT VALVE TO ACTIVATE (THE WATER INTERFERED WITH THE ESD'S PNEUMATIC OPERATION). GAS WAS RELEASED THROUGH A 6" VENT STACK INTO THE ATMOSPHERE. A VOLUME GREATER THAN THE REPORTING THRESHOLD OF 3,000 MCF WAS RELEASED RESULTING IN THE INCIDENT REPORT TO THE NRC. THE INSTRUMENT AIR DRYER HAS BEEN REPAIRED AND THE FACILITY WAS SUCCESSFULLY PLACED BACK INTO SERVICE.

PHMSA trend classification: not significant, not serious.

PHMSA standardized cause: EQUIPMENT FAILURE — OTHER EQUIPMENT FAILURE.

PHMSA indexed costs: $15,275 reported total cost, $12,461.186 in 1984 dollars, $17,778.365 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.