CONSOLIDATED EDISON CO OF NEW YORK — Gas distribution — incident on 2011-10-15

Gas distribution incident in WHITE PLAINS, WESTCHESTER County, NY. Reported cause: EQUIPMENT FAILURE. Reported consequences: 0 fatalities, 0 injuries, 100 NATURAL GAS released, $19,715 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: 20130054.

Operator ID: 2704.

Reported incident date: 10/15/2011 8:46.

Location detail: BRONX STREET AND HAMILTON AVENUE

Cause detail: NON-THREADED CONNECTION FAILURE

Cause detail: ON SATURDAY OCTOBER 15, 2011 AT 08:46 HRS A LEAK SURVEY CREW REPORTED TO THE GAS EMERGENCY RESPONSE CENTER (GERC) A TYPE-1 LEAK ALONG THE ROUTE OF THE TRANSMISSION SYSTEM AT 200' NORTH OF HAMILTON AVE ON BRONX ST., WHITE PLAINS. THE ONLY MAIN AT THIS LOCATION IS A 12" 1948 TRANSMISSION PRESSURE MAIN OPERATING AT 237 PSI AT THE TIME OF DISCOVERY. ALL CONTINGENCY VALVES WERE IDENTIFIED AND BRONX GAS OPERATIONS ASSISTED IN MANNING THESE VALVES. WESTCHESTER GAS DISTRIBUTION SERVICES, GAS CONSTRUCTION, GAS CONTROL, PRESSURE CONTROL AND CENTRAL OPERATIONS RESPONDED. OPERATIONAL PLANNING INVOLVING ALL OPERATING AREAS, PRESSURE CONTROL, GAS CONTROL, LEAK SURVEY, TRANSMISSION ENGINEERING AND MAJOR PROJECTS WAS CONDUCTED. GAS CONSTRUCTION INVESTIGATED AND IDENTIFIED THE LOCATION OF THE LEAK. GAS CONTROL REDUCED OPERATING PRESSURE TO 68 PSI. GAS CONSTRUCTION EXCAVATED AND EXPOSED A 12" COMPRESSION COUPLING LEAKING AT BOTH END RINGS. THE COUPLING WAS TIGHTENED TO TEMPORARILY SECURE THE LEAK. GAS CONSTRUCTION INSTALLED A PRE-FABRICATED WELDED REPAIR SLEEVE. WELDING OPERATIONS WERE COMPLETED ON OCTOBER 16, 2011 AT 09:15 HRS. THE REPAIR SLEEVE WAS PRESSURE TESTED AND FOUND OK . CORROSION OPERATIONS INSPECTED THE MAIN AND SAME WAS CLEANED AND COATED. LEAK SURVEY CONDUCTED A MOBILE SURVEY OF ISOLATED SECTION OF MAIN AND NO LEAKS WERE FOUND. GAS CONTROL RETURNED ROV-32717 TO THE FULLY OPENED POSITION AT 108 HRS AND PRESSURE RETURNED TO 234 PSI. AT 14:04 HRS., VALVES 25978 AND 25979 WERE FULLY OPENED. LEAK SURVEY COMPLETED THEIR SURVEY OF THE AREA AND DETECTED NO LEAKS. BACKFILLING OPERATIONS STARTED AT 14:58 HRS AND THE INCIDENT COMMAND STRUCTURE WAS TERMINATED. THE NYS PUBLIC SERVICE COMMISSION AND THE US DEPARTMENT OF TRANSPORTATION WERE NOTIFIED. THE NATIONAL TRANSPORTATION SAFETY BOARD CALLED FOR INFORMATION. THIS WAS A SERIOUS LEVEL INCIDENT. NOTE--THIS GAS DISTRIBUTION INCIDENT REPORT IS GENERATED TO REPLACE RESCINDED GAS TRANSMISSION INCIDENT REPORT 20110381-15383

PHMSA trend classification: not significant, not serious, not fire-first.

PHMSA standardized cause: EQUIPMENT FAILURE — NON-THREADED CONNECTION FAILURE.

PHMSA indexed costs: $22,912 reported total cost, $12,305.476 in 1984 dollars, $30,217.964 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.