DOMINION TRANSMISSION, INC
gas_transmission Incident — — June 10, 2013
Incident Information
| Incident Date | June 10, 2013 |
| Operator | DOMINION TRANSMISSION, INC |
| Commodity | — |
| Pipeline Type | gas_transmission |
Location
| State | |
| Coordinates | 39.89066, -77.71909 |
Cause
| Cause | EQUIPMENT FAILURE |
| Subcause | FAILURE OF EQUIPMENT BODY (EXCEPT COMPRESSOR), VESSEL PLATE, OR OTHER MATERIAL |
Casualties
| Fatalities | 0 |
| Injuries | 0 |
Costs
| Property Damage | $350,000 |
| Emergency Response | $0 |
| Other Costs | $0 |
Location Map
Incident Narrative
A REVIEW OF THE CHAMBERSBURG SILENCER DAMAGE APPEARS TO HAVE OCCURRED FROM FATIGUE THAT LIKELY HAD EXISTED FOR QUITE SOME TIME. THE HISTORY OF THIS UNIT INDICATES THAT DAMAGE OCCURRED DURING COMMISSIONING OF THIS UNIT IN 1996 THAT LIKELY TOOK A SLUG OF HYDRO-TEST WATER AND PROBABLY CRACKED/DAMAGED THE INTERNAL 44"" DIAMETER FORMED & DISHED HEAD. REPAIRS TO THE UPPER SECTION WERE REPAIRED AND THE ORIFICE PLATE WAS REDESIGNED/REPLACED AT THIS SAME TIME, BUT NO DAMAGE WAS IDENTIFIED TO THE LOWER SECTION. THE SILENCER'S CURRENT DESIGN HAS THE DISHED HEAD ABSORBING THE MAJORITY OF THE DISCHARGE GAS FORCES. THE DISHED HEAD FAILED DURING THE 6/10/2013 VENTING EVENT CAUSING THE ENTIRE EASTERN WALL OF THE VESSEL TO FAIL. THIS ALLOWED ALL THE GAS TO VENT OUT THE SIDE OF THE SILENCER UNIT.
About This Pipeline Incident
Pipeline incident data is reported to the Pipeline and Hazardous Materials Safety Administration (PHMSA). All significant incidents involving fatalities, injuries, or property damage over $50,000 must be reported.