KEYSPAN ENERGY DELIVERY - NY CITY

Incident Narrative

ON OCTOBER 28TH OF 2014, A NATIONAL GRID STATEN ISLAND FIELD OPS CREW MOBILIZED TO INVESTIGATE A LEAK AT 45 TRANTOR PL. THEY FOUND A STEEL PROTECTION PLATE ON TOP OF THE SERVICE TEE CAP. AS A RESULT, THE SERVICE TEE WAS LEAKING AND REQUIRED REPAIR. THE CREW INSTALLED A NEW SERVICE TEE, TRANSFERRED THE SERVICE CONNECTION AND INSTALLED AN ADAM SLEEVE OVER THE LEAKING SECTION AS A 'MAKE SAFE' TEMPORARY REPAIR. THEY MONITORED THE LOCATION OVERNIGHT. THE FOLLOWING DAY (OCTOBER 29TH) THE CREW RETURNED TO THE LOCATION TO MAKE THE PERMANENT REPAIR. IN ORDER TO PERFORM THE REPAIR, THEY NEEDED TO ISOLATE THE SECTION OF MAIN BY APPLYING SQUEEZE OFF DEVICES. THEY REVIEWED THE NRG MAPS AND CONTACTED GAS CONTROL TO CONFIRM THAT THE MAIN WAS BACK FED. THE GAS CONTROL OPERATOR UTILIZED THE 'CONNECTIVITY' TOOL IN THE NRG MAPPING SYSTEM AND PANNED TO ABOUT 600 SCALE IN ORDER TO CONFIRM BACKFEED. SINCE THE 'CONNECTIVITY' TOOL AND A PAN OF THE AREA CONFIRMED THAT THERE WAS A BACKFEED, APPROVAL TO PERFORM THE SQUEEZE OFF WAS GRANTED BY GAS CONTROL. UNFORTUNATELY, THE 'CONNECTIVITY' TOOL DID NOT ACCOUNT FOR THE DEAD END OF THE MAIN WHICH IS ABOUT 1.6 MILES FROM THE JOB LOCATION. FIELD OPS NOR GAS CONTROL IDENTIFIED THE DEADEND IN THE NRG MAPPING SYSTEM WHEN THEY REVIEWED IT BECAUSE TO CAPTURE BOTH THE JOB LOCATION AND THE DEAD END, THE USER WOULD HAVE TO ZOOM OUT TO 900 SCALE. THE CREW INSTALLED AND MONITORED PRESSURE GAUGES PRIOR TO THE INSTALLATION OF THE ISOLATION DEVICES (SQUEEZE OFFS). KNOWLEDGE OF THE UNPLANNED SUPPLY INTERRUPTION OCCURRED WHEN THE NATIONAL GRID CALL CENTER STARTED TO RECEIVE NO GAS CALLS AROUND 12:00PM. THERE WERE 226 CUSTOMERS INVOLVED IN THE OUTAGE.