# PHMSA Hazmat Incident X-2021070158 — SULFUR, MOLTEN — SIBLEY, IA

**Citation:** PHMSA Hazmat Incident X-2021070158  
**Type / status:** incident / historical  
**Agency:** Pipeline and Hazardous Materials Safety Administration  
**Effective:** 2021-05-16  
**Published:** Not stated

Serious reporter-submitted hazardous materials transportation incident on 2021-05-16 in SIBLEY, IA.

## Document text

PHMSA hazardous materials incident report X-2021070158.
Incident date: 2021-05-16.
Location: SIBLEY, IA.
Mode: Rail.
Carrier/reporter: UNION PACIFIC RAILROAD.
Shipper: ERCO Worldwide / Flint Hills Resources LP / MARATHON PETROLEUM COMPANY LP.
Materials: NA2448; SULFUR, MOLTEN; hazard class 9; 22413.875 LGA released | NA2448; SULFUR, MOLTEN; hazard class 9; 6813.375 LGA released | UN1203; GASOLINE INCLUDES GASOLINE MIXED WITH ETHYL ALCOHOL, WITH NOT MORE THAN 10% ALCOHOL; hazard class 3; 27518 LGA released | UN1203; GASOLINE INCLUDES GASOLINE MIXED WITH ETHYL ALCOHOL, WITH NOT MORE THAN 10% ALCOHOL; hazard class 3; 27816 LGA released | UN1203; GASOLINE INCLUDES GASOLINE MIXED WITH ETHYL ALCOHOL, WITH NOT MORE THAN 10% ALCOHOL; hazard class 3; 28028 LGA released | UN1789; HYDROCHLORIC ACID; hazard class 8; 11875 LGA released | UN1789; HYDROCHLORIC ACID; hazard class 8; 18346.875 LGA released | UN1789; HYDROCHLORIC ACID; hazard class 8; 6071.875 LGA released | UN1814; POTASSIUM HYDROXIDE, SOLUTION; hazard class 8; 191750 LGA released | UN3257; ELEVATED TEMPERATURE LIQUID, N.O.S., AT OR ABOVE 100 C AND BELOW ITS FLASH POINT (INCLUDING MOLTEN METALS, MOLTEN SALTS, ETC.); hazard class 9; 11789.875 LGA released.
What failed: Bottom Outlet Valve / Gasket / Manway or Dome Cover / Tank Head / Tank Shell.
How failed: Leaked.
Reported failure causes: Derailment.
Reported result: Spillage.
Reporter-submitted DOT Form 5800.1 data may be incomplete, corrected, supplemented, or misreported. A record, serious-incident classification, failure description, or relationship to a reporting rule is not a PHMSA causal finding, compliance determination, or finding of a violation.

## Provenance

- Official: Yes
- Source: <https://portal.phmsa.dot.gov/PDFGenerator/getPublicReport/OHMIR_5800-1-PUBLIC?INCIDENTID=esWaja3ighaiew%2Ff%2FtG89g%3D%3D>
- Source ID: `phmsa-hazmat-incidents`
- SHA-256: `83fcc9e8f56c2c8c9286a9bf4cb9ec1ad42bafbffd470260976d1f5ac900129d`
- Retrieved: 2026-08-13T12:55:56.545Z
- Exported: 2026-08-27T04:51:34.967Z
- Document slug: `phmsa-hazmat-incident-x-2021070158`

### Source metadata

```json
{
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  "reportNumber": "X-2021070158",
  "operatorReported": true,
  "serious": true,
  "finalAgencyFinding": false,
  "eventDescriptionExcluded": true,
  "publicPdfUrl": "https://portal.phmsa.dot.gov/PDFGenerator/getPublicReport/OHMIR_5800-1-PUBLIC?INCIDENTID=esWaja3ighaiew%2Ff%2FtG89g%3D%3D",
  "rowCount": 10,
  "carrierReporterNames": [
    "UNION PACIFIC RAILROAD"
  ],
  "shipperNames": [
    "ERCO Worldwide",
    "Flint Hills Resources LP",
    "MARATHON PETROLEUM COMPANY LP"
  ],
  "routes": [
    "MP 195.75"
  ],
  "cities": [
    "SIBLEY"
  ],
  "states": [
    "IA"
  ],
  "originCities": [],
  "modes": [
    "Rail"
  ],
  "materials": [
    {
      "identificationNumber": "NA2448",
      "commodityName": "SULFUR, MOLTEN",
      "hazardousClass": "9",
      "quantityReleased": "22413.875",
      "unitOfMeasure": "LGA"
    },
    {
      "identificationNumber": "NA2448",
      "commodityName": "SULFUR, MOLTEN",
      "hazardousClass": "9",
      "quantityReleased": "6813.375",
      "unitOfMeasure": "LGA"
    },
    {
      "identificationNumber": "UN1203",
      "commodityName": "GASOLINE INCLUDES GASOLINE MIXED WITH ETHYL ALCOHOL, WITH NOT MORE THAN 10% ALCOHOL",
      "hazardousClass": "3",
      "quantityReleased": "27518",
      "unitOfMeasure": "LGA"
    },
    {
      "identificationNumber": "UN1203",
      "commodityName": "GASOLINE INCLUDES GASOLINE MIXED WITH ETHYL ALCOHOL, WITH NOT MORE THAN 10% ALCOHOL",
      "hazardousClass": "3",
      "quantityReleased": "27816",
      "unitOfMeasure": "LGA"
    },
    {
      "identificationNumber": "UN1203",
      "commodityName": "GASOLINE INCLUDES GASOLINE MIXED WITH ETHYL ALCOHOL, WITH NOT MORE THAN 10% ALCOHOL",
      "hazardousClass": "3",
      "quantityReleased": "28028",
      "unitOfMeasure": "LGA"
    },
    {
      "identificationNumber": "UN1789",
      "commodityName": "HYDROCHLORIC ACID",
      "hazardousClass": "8",
      "quantityReleased": "11875",
      "unitOfMeasure": "LGA"
    },
    {
      "identificationNumber": "UN1789",
      "commodityName": "HYDROCHLORIC ACID",
      "hazardousClass": "8",
      "quantityReleased": "18346.875",
      "unitOfMeasure": "LGA"
    },
    {
      "identificationNumber": "UN1789",
      "commodityName": "HYDROCHLORIC ACID",
      "hazardousClass": "8",
      "quantityReleased": "6071.875",
      "unitOfMeasure": "LGA"
    },
    {
      "identificationNumber": "UN1814",
      "commodityName": "POTASSIUM HYDROXIDE, SOLUTION",
      "hazardousClass": "8",
      "quantityReleased": "191750",
      "unitOfMeasure": "LGA"
    },
    {
      "identificationNumber": "UN3257",
      "commodityName": "ELEVATED TEMPERATURE LIQUID, N.O.S., AT OR ABOVE 100 C AND BELOW ITS FLASH POINT (INCLUDING MOLTEN METALS, MOLTEN SALTS, ETC.)",
      "hazardousClass": "9",
      "quantityReleased": "11789.875",
      "unitOfMeasure": "LGA"
    }
  ],
  "packages": [
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  "reportingRuleContext": [
    "171.15",
    "171.16"
  ],
  "caveat": "Reporter-submitted DOT Form 5800.1 data may be incomplete, corrected, supplemented, or misreported. A record, serious-incident classification, failure description, or relationship to a reporting rule is not a PHMSA causal finding, compliance determination, or finding of a violation.",
  "privacyCaveat": "The public CSV excludes preparer contact fields. Event Description is intentionally excluded from normalized records and search output to reduce incidental personal-information risk.",
  "jurisdiction": "US"
}
```