NORTHERN NATURAL GAS CO — Gas transmission and gathering — incident on 2017-09-27

Gas transmission and gathering incident in Not Within a Municipality, PRATT County, KS. Reported cause: CORROSION FAILURE. Reported consequences: 0 fatalities, 0 injuries, 100 NATURAL GAS released, $95,982 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: 20170097.

Operator ID: 13750.

Reported incident date: 9/27/2017 16:14.

Location detail: 36.97

Cause detail: INTERNAL CORROSION

Cause detail: ON SEPTEMBER 27, 2017 WHILE CUNNINGHAM PERSONNEL WERE PERFORMING THE ROUTINE ANNUAL GAS LEAK SURVEY THEY FOUND ELEVATED GAS LEVELS IN THE AREA OF THE MAINLINE DRIP IDENTIFIED AS V-1030. FURTHER INVESTIGATION FOUND THAT THE 2-INCH DRAIN LINE FOR V-1030 HAD BEEN LEAKING. THE LINE WAS REMOVED FROM SERVICE AND ABANDONED. A NEW LINE WAS INSTALLED ON SEPTEMBER 30, 2017. THE ABANDONED 2-INCH PIPE WAS NEVER EXCAVATED OR EXAMINED FOR THE EXACT CAUSE OF THIS GRADE 3 LEAK. WE SUSPECT INTERNAL CORROSION.

PHMSA trend classification: not significant, not serious.

PHMSA standardized cause: CORROSION — INTERNAL.

PHMSA indexed costs: $99,250 reported total cost, $49,974.564 in 1984 dollars, $119,357.464 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.