# PHMSA Hazmat Incident I-1999090643 — CARBON DIOXIDE, REFRIGERATED LIQUID — HENNESSEY, OK

**Citation:** PHMSA Hazmat Incident I-1999090643  
**Type / status:** incident / historical  
**Agency:** Pipeline and Hazardous Materials Safety Administration  
**Effective:** 1999-08-18  
**Published:** Not stated

Serious reporter-submitted hazardous materials transportation incident on 1999-08-18 in HENNESSEY, OK.

## Document text

PHMSA hazardous materials incident report I-1999090643.
Incident date: 1999-08-18.
Location: HENNESSEY, OK.
Mode: Highway.
Carrier/reporter: NU CO 2 INC.
Shipper: NU CO 2 INC.
Materials: UN2187; CARBON DIOXIDE, REFRIGERATED LIQUID; hazard class 2.2; 187.5 LGA released.
What failed: Auxiliary Valve; Piping or Fittings.
Reported failure causes: Rollover Accident; Vehicular Crash or Accident Damage.
Reported result: Spillage, Vapor(Gas) Dispersion.
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=lGP8iQVPkRie67yhRsKF0Q%3D%3D>
- Source ID: `phmsa-hazmat-incidents`
- SHA-256: `4746694053533024610962dd2ab7f960eae4957ae3c0456e76d708b0615f4d6a`
- Retrieved: 2026-08-13T12:55:56.545Z
- Exported: 2026-08-25T02:31:10.229Z
- Document slug: `phmsa-hazmat-incident-i-1999090643`

### Source metadata

```json
{
  "materialSubtype": "phmsa_hazmat_serious_incident",
  "reportNumber": "I-1999090643",
  "operatorReported": true,
  "serious": true,
  "finalAgencyFinding": false,
  "eventDescriptionExcluded": true,
  "publicPdfUrl": "https://portal.phmsa.dot.gov/PDFGenerator/getPublicReport/OHMIR_5800-1-PUBLIC?INCIDENTID=lGP8iQVPkRie67yhRsKF0Q%3D%3D",
  "rowCount": 1,
  "carrierReporterNames": [
    "NU CO 2 INC"
  ],
  "shipperNames": [
    "NU CO 2 INC"
  ],
  "routes": [
    "HWY 51"
  ],
  "cities": [
    "HENNESSEY"
  ],
  "states": [
    "OK"
  ],
  "originCities": [
    "OKLAHOMA CITY"
  ],
  "modes": [
    "Highway"
  ],
  "materials": [
    {
      "identificationNumber": "UN2187",
      "commodityName": "CARBON DIOXIDE, REFRIGERATED LIQUID",
      "hazardousClass": "2.2",
      "quantityReleased": "187.5",
      "unitOfMeasure": "LGA"
    }
  ],
  "packages": [
    {
      "identificationMarkings": null,
      "outerMaterial": null,
      "outerType": null,
      "outerCapacity": "625",
      "outerCapacityUnit": "LGA",
      "outerShipmentCount": "1",
      "outerFailedCount": "1",
      "innerMaterial": null,
      "innerType": null,
      "innerCapacity": "0",
      "innerCapacityUnit": null,
      "innerShipmentCount": "0",
      "innerFailedCount": "0"
    }
  ],
  "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"
}
```