# EAST TENNESSEE NATURAL GAS, LLC (SPECTRA ENERGY PARTNERS, LP) — Gas transmission and gathering — incident on 2018-05-21

**Citation:** PHMSA Report 20180059  
**Type / status:** incident / historical  
**Agency:** Pipeline and Hazardous Materials Safety Administration  
**Effective:** 2018-05-21  
**Published:** 2018-06-08

Gas transmission and gathering incident in Not Within a Municipality, GRUNDY County, TN. Reported cause: CORROSION FAILURE. Reported consequences: 0 fatalities, 0 injuries, 3 NATURAL GAS released, $251,000 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 in Not Within a Municipality, GRUNDY County, TN. Reported cause: CORROSION FAILURE. Reported consequences: 0 fatalities, 0 injuries, 3 NATURAL GAS released, $251,000 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: 20180059.

Operator ID: 4070.

Reported incident date: 5/21/2018 16:15.

Location detail: 35.56

Cause detail: EXTERNAL CORROSION

Cause detail: A NATURAL GAS PIN HOLE LEAK WAS DISCOVERED DURING A CORROSION ANOMALY INVESTIGATION ON THE EAST TENNESSEE NATURAL GAS 12-INCH LINE 3200-1 AT MILE POST 35.56 NEAR TRACY CITY, TENNESSEE AT 4:15 PM, MAY 21, 2018. THE CAUSE OF THE PIN HOLE WAS EXTERNAL CORROSION. THE PIPE REPLACEMENT WAS COMPLETED JULY 20, 2018.

PHMSA trend classification: significant incident, not serious.

PHMSA standardized cause: CORROSION — EXTERNAL.

PHMSA indexed costs: $256,052 reported total cost, $124,617.552 in 1984 dollars, $301,069.192 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: `7ac3e1ffbfe8a4e4dc2d36927af4d4df14005b47f61b9f1d44ac43bf08eabf24`
- Retrieved: 2026-08-20T03:30:32.010Z
- Exported: 2026-08-24T13:47:06.460Z
- Document slug: `phmsa-incident-6b5c4ddae662dcaef6867abf`

### Source metadata

```json
{
  "recordKind": "pipeline_incident",
  "datasetType": "gas_transmission_gathering",
  "datasetLabel": "Gas transmission and gathering",
  "datasetPeriod": "January 2010 to present",
  "report": {
    "number": "20180059",
    "supplementalNumber": "32778",
    "type": "SUPPLEMENTAL FINAL",
    "receivedDate": "2018-06-08",
    "receivedDateRaw": "6/8/2018"
  },
  "operator": {
    "id": "4070",
    "name": "EAST TENNESSEE NATURAL GAS, LLC (SPECTRA ENERGY PARTNERS, LP)"
  },
  "incident": {
    "date": "2018-05-21",
    "dateRaw": "5/21/2018 16:15"
  },
  "location": {
    "city": "Not Within a Municipality",
    "county": "GRUNDY",
    "state": "TN",
    "postalCode": "37387",
    "latitude": 35.24538713,
    "longitude": -85.7531995,
    "type": "PIPELINE RIGHT-OF-WAY",
    "details": {
      "DESIGNATED_NAME": "35.56"
    },
    "facilityName": "3200-1"
  },
  "cause": {
    "category": "CORROSION FAILURE",
    "details": {
      "CAUSE_DETAILS": "EXTERNAL CORROSION",
      "NARRATIVE": "A NATURAL GAS PIN HOLE LEAK WAS DISCOVERED DURING A CORROSION ANOMALY INVESTIGATION ON THE EAST TENNESSEE NATURAL GAS 12-INCH LINE 3200-1 AT MILE POST 35.56 NEAR TRACY CITY, TENNESSEE AT 4:15 PM, MAY 21, 2018. THE CAUSE OF THE PIN HOLE WAS EXTERNAL CORROSION. THE PIPE REPLACEMENT WAS COMPLETED JULY 20, 2018."
    }
  },
  "consequences": {
    "fatalities": 0,
    "injuries": 0,
    "commodity": "NATURAL GAS",
    "release": "3",
    "propertyDamage": 251000,
    "estimatedOperatorCost": 0,
    "estimatedEmergencyCost": 0,
    "estimatedEnvironmentalCost": null,
    "ignition": "NO",
    "explosion": "NO",
    "evacuated": 0,
    "raw": {
      "FATAL": "0",
      "INJURE": "0",
      "UNINTENTIONAL_RELEASE": "3",
      "EST_COST_PROP_DAMAGE": "251000",
      "PRPTY": "256052"
    }
  },
  "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": 973,
    "rowSha256": "475d10b18a93c65099facb91b251ba65aa3edc92e945bae9e11008b97dd13eab"
  },
  "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": "EXTERNAL",
      "eightCategory": "CORROSION",
      "eightSubcategory": "EXTERNAL"
    },
    "costs": {
      "reported": 256052,
      "in1984Dollars": 124617.55237459374,
      "currentYearDollars": 301069.191865005
    },
    "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": 1023,
      "rowSha256": "6d3f30ff031350c1ca80bc448db2198afaa4bbeabd7513ee2a2c6156c74e52aa"
    }
  },
  "jurisdiction": "US",
  "operatorName": "EAST TENNESSEE NATURAL GAS, LLC (SPECTRA ENERGY PARTNERS, LP)"
}
```