TRANSCONTINENTAL GAS PIPE LINE COMPANY
gas_transmission Incident — — March 18, 2014
Incident Information
| Incident Date | March 18, 2014 |
| Operator | TRANSCONTINENTAL GAS PIPE LINE COMPANY |
| Commodity | NATURAL GAS |
| Pipeline Type | gas_transmission |
Location
| State | |
| Coordinates | 28.65391, -91.00142 |
Cause
| Cause | CORROSION FAILURE |
| Subcause | INTERNAL CORROSION |
Casualties
| Fatalities | 0 |
| Injuries | 0 |
Costs
| Property Damage | $175,000 |
| Emergency Response | $0 |
| Other Costs | $2,500 |
Location Map
Incident Narrative
"RCA : WE (TRANSCO) RECEIVED A CALL FROM PRODUCER (FIELDWOOD) AT APPROXIMATELY 2:50PM ON 3-18-14 REPORTING THAT THEY SPOTTED BUBBLES COMING FROM PLATFORM SS 182. A HELICOPTER IS DISPATCHED TO LEAK SITE AND THEY PLOT GIVEN COORDINATES. THE LEAK LOCATION IS VERY CONGESTED WITH PRODUCER GATHERING PIPELINES WHICH COMPLICATE OUR INVESTIGATION. WITH THE INFORMATION GATHERED WE DETERMINE THAT IT IS OUR 10"" (SELA) OFFSHORE GATHERING LINE THAT COULD BE LEAKING. A DIVE BOAT IS DISPACHED TO THE LEAK LOCATION. MULTIPLE PRODUCER LINES ARE ISOLATED. 03-21-2014. EXAMINATION BY DIVERS IDENTIFIED AN ISOLATED PINHOLE LEAK AT THE 7 O'CLOCK POSITION ON THE 10"" GATHERING LINE. THE ISOLATED PINHOLE LEAK WITH NO WALL LOSS IS CONFIRMED BY ULTRASONIC TEST READINGS . 03-22-2014 REPAIR CLAMP IS INSTALLED AND THE 10"" GATHERING LINE IS PUT BACK INTO SERVICE. THIS OCCURRENCE SUPPORTS THE LEAK CAUSE IS DUE TO INTERNAL CORROSION; THIS CONCLUSION IS CONSISTENT WITH OUR EXPERIENCE WITH PREVIOUS INCIDENTS OF THIS NATURE. THE LINE IS UN-PIGGABLE, AND IS IN TWO-PHASE WET GAS GATHERING SERVICE. THE LINE IS TREATED WITH CHEMICAL INHIBITORS AND BIOCIDES THROUGH CONTINUOUS INJECTION AND BATCH TREATING. THIS LINE AND SEVERAL OTHERS COMINGLE FLOW TO OUR FACILITY AT MOSQUITO BAY, WHERE WE COLLECT SAMPLES AND MONITOR RESIDUALS. THE CHEMICAL INJECTION EQUIPMENT OPERATION AND CHEMICAL QUANTITIES ARE CHECKED MONTHLY BY OUR FIELD TECHNICIANS. THESE ACTIONS ARE CONSISTENT WITH OUR SOP 20.11.03, WILLIAMS GENERAL INTERNAL CORROSION POLICY"
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.