# ENBRIDGE OFFSHORE (GAS TRANSMISSION) LLC — Gas transmission and gathering — incident on 2011-08-28

**Citation:** PHMSA Report 20130103  
**Type / status:** incident / historical  
**Agency:** Pipeline and Hazardous Materials Safety Administration  
**Effective:** 2011-08-28  
**Published:** 2013-11-21

Gas transmission and gathering incident. Reported cause: CORROSION FAILURE. Reported consequences: 0 fatalities, 0 injuries, 1100 NATURAL GAS released, $70,074 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. PHMSA trend classification: significant incident, not serious.

## Document text

Gas transmission and gathering incident. Reported cause: CORROSION FAILURE. Reported consequences: 0 fatalities, 0 injuries, 1100 NATURAL GAS released, $70,074 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: 20130103.

Operator ID: 18646.

Reported incident date: 8/28/2011 14:00.

Cause detail: INTERNAL CORROSION

Cause detail: A LEAK WAS DETECTED BY AN ENBRIDGE OPERATOR 8-28-2011 WHILE FLYING OVER THE AREA. THE OPERATOR OF THE PLATFORM THAT TIES INTO THE LINE WAS CONTACTED AND THE OPERTOR WAS ABLE TO FLY TO THE PLATFORM AND SHUT OFF THE FLOW TO THE PIPELINE (ISOLATING THE LINE AT THE SOURCE) ON 8-29-2011. A DIVE BOAT ARRIVED ON LOCATION AND ISOLATED THE PIPELINE BY CLOSING A SUBSEA VALVE AT WC 144 ON 8-30-2011.

PHMSA trend classification: significant incident, not serious.

PHMSA standardized cause: CORROSION — INTERNAL.

PHMSA indexed costs: $194,074 reported total cost, $124,582.721 in 1984 dollars, $199,379.652 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.

## Provenance

- Official: Yes
- Source: <https://data.transportation.gov/api/views/27nc-rsge/files/2b05c2d8-d14a-4c56-ac1c-7d23a4bc31c8?download=true&filename=Gas%20Transmission%20%26%20Gathering%20Incident%20Data%20-%20January%202010%20to%20present.zip>
- Source ID: `phmsa-pipeline-incidents`
- SHA-256: `2e327b402124ff548a9d85cd93ce4b2af7137faffd9dcb186b65e45ed0e3bd3d`
- Retrieved: 2026-08-20T03:30:32.010Z
- Exported: 2026-08-27T03:21:16.856Z
- Document slug: `phmsa-incident-aa6ef860be4a3903b5070fbc`

### Source metadata

```json
{
  "recordKind": "pipeline_incident",
  "datasetType": "gas_transmission_gathering",
  "datasetLabel": "Gas transmission and gathering",
  "datasetPeriod": "January 2010 to present",
  "report": {
    "number": "20130103",
    "supplementalNumber": "16362",
    "type": "SUPPLEMENTAL",
    "receivedDate": "2013-11-21",
    "receivedDateRaw": "11/21/2013"
  },
  "operator": {
    "id": "18646",
    "name": "ENBRIDGE OFFSHORE (GAS TRANSMISSION) LLC"
  },
  "incident": {
    "date": "2011-08-28",
    "dateRaw": "8/28/2011 14:00"
  },
  "location": {
    "city": null,
    "county": null,
    "state": null,
    "postalCode": null,
    "latitude": 29.392024,
    "longitude": -93.173704,
    "type": "OFFSHORE",
    "details": {},
    "facilityName": null
  },
  "cause": {
    "category": "CORROSION FAILURE",
    "details": {
      "CAUSE_DETAILS": "INTERNAL CORROSION",
      "NARRATIVE": "A LEAK WAS DETECTED BY AN ENBRIDGE OPERATOR 8-28-2011 WHILE FLYING OVER THE AREA. THE OPERATOR OF THE PLATFORM THAT TIES INTO THE LINE WAS CONTACTED AND THE OPERTOR WAS ABLE TO FLY TO THE PLATFORM AND SHUT OFF THE FLOW TO THE PIPELINE (ISOLATING THE LINE AT THE SOURCE) ON 8-29-2011. A DIVE BOAT ARRIVED ON LOCATION AND ISOLATED THE PIPELINE BY CLOSING A SUBSEA VALVE AT WC 144 ON 8-30-2011."
    }
  },
  "consequences": {
    "fatalities": 0,
    "injuries": 0,
    "commodity": "NATURAL GAS",
    "release": "1100",
    "propertyDamage": 70074,
    "estimatedOperatorCost": 0,
    "estimatedEmergencyCost": 0,
    "estimatedEnvironmentalCost": null,
    "ignition": "NO",
    "explosion": "NO",
    "evacuated": 0,
    "raw": {
      "FATAL": "0",
      "INJURE": "0",
      "UNINTENTIONAL_RELEASE": "1100",
      "EST_COST_PROP_DAMAGE": "70074",
      "PRPTY": "194074"
    }
  },
  "provenance": {
    "viewId": "27nc-rsge",
    "viewUrl": "https://data.transportation.gov/api/views/27nc-rsge",
    "assetId": "2b05c2d8-d14a-4c56-ac1c-7d23a4bc31c8",
    "archiveFilename": "Gas Transmission & Gathering Incident Data - January 2010 to present.zip",
    "archiveSha256": "fe0b136ca4b00ac987a8bc2e195098accf910d97512c5fc3b59e62d9da5f674e",
    "memberPath": "incident_gas_transmission_gathering_jan2010_present.txt",
    "memberSha256": "b435f2a25718cf54c54e00294e6788c4f9c6860e02fb86355e75d294c243c4dd",
    "rowNumber": 1796,
    "rowSha256": "277fbe413eb1b5dd9ef3703ee3f90d62e5e871e219b379cb939b00c4c5daadcc"
  },
  "caveat": "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.",
  "operatorReported": true,
  "finalAgencyFinding": false,
  "flaggedAnalysis": {
    "dataAsOf": "2026-07-31",
    "flags": {
      "fireFirst": null,
      "significant": true,
      "serious": false
    },
    "standardizedCause": {
      "sevenCategory": "CORROSION",
      "sevenSubcategory": "INTERNAL",
      "eightCategory": "CORROSION",
      "eightSubcategory": "INTERNAL"
    },
    "costs": {
      "reported": 194074,
      "in1984Dollars": 124582.7205424099,
      "currentYearDollars": 199379.65217647675
    },
    "caveat": "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.",
    "provenance": {
      "sourceUrl": "https://www.phmsa.dot.gov/sites/phmsa.dot.gov/files/data_statistics/pipeline/PHMSA_Pipeline_Safety_Flagged_Incidents.zip",
      "landingPageUrl": "https://www.phmsa.dot.gov/data-and-statistics/pipeline/pipeline-incident-flagged-files",
      "catalogUrl": "https://data.transportation.gov/Pipelines-and-Hazmat/Pipeline-Incident-Flagged-Files/qdme-9bbm",
      "retrievalMode": "official_live",
      "archivedAt": null,
      "archiveSha256": "317e6a3e16d60b9b677efe391dc40258b5dd7ead83fb8bea74cb553cedfbbdec",
      "workbook": "gtggungs2010toPresent.xlsx",
      "sheet": "gtggungs2010toPresent",
      "rowNumber": 440,
      "rowSha256": "f149fa1098dc52a2a10e5f5a0a10073982ab5b96bd11b561eba72df4c2f0aa5b"
    }
  },
  "jurisdiction": "US",
  "operatorName": "ENBRIDGE OFFSHORE (GAS TRANSMISSION) LLC"
}
```