# PHMSA Hazmat Incident X-2021070033 — SULFURIC ACID, SPENT — ROXANA, IL

- **operation:** document
- **citation:** PHMSA Hazmat Incident X-2021070033
- **title:** PHMSA Hazmat Incident X-2021070033 — SULFURIC ACID, SPENT — ROXANA, IL
- **source type:** incident
- **agency:** Pipeline and Hazardous Materials Safety Administration
- **status:** historical
- **official:** true
- **published on:** Not available
- **effective on:** 2021-07-02
- **summary:** Serious reporter-submitted hazardous materials transportation incident on 2021-07-02 in ROXANA, IL.
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- **source url:** https://portal.phmsa.dot.gov/PDFGenerator/getPublicReport/OHMIR_5800-1-PUBLIC?INCIDENTID=Yc2vvpg083RiM3QzjuOr1Q%3D%3D
**body:**

PHMSA hazardous materials incident report X-2021070033.
Incident date: 2021-07-02.
Location: ROXANA, IL.
Mode: Rail.
Carrier/reporter: NORFOLK SOUTHERN.
Shipper: Phillips 66 WRB Refinery.
Materials: UN1832; SULFURIC ACID, SPENT; hazard class 8; 12.5 LGA released.
What failed: Pressure Relief Valve or Device - Reclosing; Pressure Relief Valve or Device - Reclosing.
How failed: Vented; Vented.
Reported failure causes: Commodity Polymerization; Over-pressurized.
Reported result: 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.
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