Incidenthistorical
PHMSA Report 20140039
GAS TRANSMISSION NORTHWEST LLC — Gas transmission and gathering — incident on 2014-03-12
Current as of 2014-03-12 Government source
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Gas transmission and gathering incident in MOYIE SPRINGS, BOUNDARY County, ID. Reported cause: MATERIAL FAILURE OF PIPE OR WELD. Reported consequences: 0 fatalities, 0 injuries, 1 NATURAL GAS released, $420,000 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: 20140039.
Operator ID: 15014.
Reported incident date: 3/12/2014 14:08.
Location detail: 20.8
Cause detail: DESIGN-, CONSTRUCTION-, INSTALLATION-, OR FABRICATION-RELATED
Cause detail: ANALYSIS OF ILI DATA SHOWED AN INDICATION OF A DENT IN THE BOTTOM QUADRANT OF THE GTN A-LINE PIPELINE 447 FEET UPSTREAM OF MAINLINE VALVE MLV 3-1. A GROUND BASED LEAKAGE SURVEY WAS CONDUCTED AT THE SITE AND UPSTREAM AND DOWNSTREAM FOR A DISTANCE OF 300 FEET IN BOTH DIRECTIONS. GAS WAS DETECTED AT THE GROUND SURFACE NEAR THE LOCATION OF THE SUSPECTED DENT. THE PIPELINE PRESSURE WAS REDUCED AND THE PIPELINE SEGMENT WAS ISOLATED. PRESSURE REDUCTION WAS HELD BELOW 80% OF THE HIGHEST PRESSURE RECORDED DURING THE PREVIOUS 60 DAYS WHILE THE INVESTIGATION CONTINUED TO LOCATE THE POSITION OF THE LEAK. AFTER THE LOCATION OF THE LEAK WAS FURTHER LOCALIZED, THE PIPELINE SECTION WAS VENTED TO NEAR ATMOSPHERIC PRESSURE AND WAS HELD THERE UNTIL THE REPAIR PROCESS WAS BEGUN. FURTHER INVESTIGATION CONFIRMED A DENT WITH A CRACK NEAR THE BOTTOM OF THE PIPE. THE PIPE SECTION WAS CUT OUT AND REPLACED.
PHMSA trend classification: significant incident, not serious.
PHMSA standardized cause: MATERIAL FAILURE OF PIPE OR WELD — CONSTRUCTION, INSTALLATION OR FABRICATION-RELATED.
PHMSA indexed costs: $558,725 reported total cost, $308,436.01 in 1984 dollars, $644,070.164 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.
This material provides agency context. It does not replace binding regulatory text, and its legal effect depends on the underlying authority and facts.