HOT WORK WITHOUT PERMIT — CRUDE OIL TANK VENT IGNITION — 3 FATALITIES
Partridge-Raleigh Oilfield Hot Work Fatal Explosions
Partridge-Raleigh Oil Company / Stringer Oilfield Services
📍 Raleigh County, MS
Incident: June 5, 2006  •  CSB Report: June 2007
3
Fatalities
Hydrocarbon Vapors (Crude Oil Production Tank Vents — Ignited by Welding Sparks)
Chemical Involved
9
CSB Recommendations
📋 Incident Summary

On June 5, 2006, three contractor workers were killed and one was seriously injured at the Partridge-Raleigh oil production facility in Raleigh County, Mississippi. The workers, employed by Stringer Oilfield Services, were standing on top of a series of crude oil production tanks when welding sparks ignited flammable hydrocarbon vapors venting from an uncapped pipe approximately four feet away.

The ignited vapors flashed back through overflow pipes into two of the tanks, causing explosions that destroyed the tanks and engulfed the workers. No hot work permit had been issued; no vapor testing had been conducted; and the tanks were not cleaned or isolated before welding began on or near them.

The CSB found that Stringer Oilfield Services lacked hot work safety procedures and did not implement available API 2009 guidance on safe welding practices near tanks. Both companies failed to adhere to OSHA requirements addressing safe welding practices on or near flammable liquid containers.

🔎 Key Findings
Finding 01
No Hot Work Permit Issued — No Vapor Testing Conducted
No hot work permit was issued for the welding operation on top of the crude oil production tanks. No atmospheric testing for flammable vapors was conducted before welding began.
Finding 02
Welders Unaware of Flammable Vapor Venting Nearby
The workers did not know that flammable hydrocarbon vapors were venting from an uncapped pipe approximately four feet from their work location. Vapor testing would have immediately identified the ignitable atmosphere.
Finding 03
Hot Work Directly on or Adjacent to Flammable Liquid Containers
Welding was conducted on top of crude oil production tanks that contained residual hydrocarbons and active vent emissions — a direct violation of fundamental hot work safety requirements.
Finding 04
No API 2009 Guidance Implemented
API Recommended Practice 2009 provides specific guidance that would have required gas testing and tank isolation before the welding activity. This guidance was not used.
Finding 05
Contractor Lacked Hot Work Safety Program
Stringer Oilfield Services did not have effective hot work safety procedures. Workers were assigned to weld on and around crude oil tanks without any pre-job hazard analysis, atmospheric testing, or hot work permit process.
🔍 Root Causes
1
Hot Work Conducted Without Permit, Testing, or Hazard Control
Welding was performed on top of crude oil production tanks without a hot work permit, without atmospheric testing, and without measures to control the flammable vapor hazard from tank vents.
2
Workers Not Trained on Hot Work Hazards Near Flammable Containers
Contractor workers had not received adequate training on the specific hazards of hot work on or adjacent to crude oil production tanks, including the flashback potential from tank vent vapors.
3
No Pre-Job Hazard Review by Either Operator or Contractor
Neither Partridge-Raleigh nor Stringer conducted a pre-job hazard review. The uncapped vent pipe venting flammable vapors adjacent to the work area was not identified before welding began.
☑ CSB Recommendations
→ Oil Production Operators / Partridge-Raleigh
Implement a formal hot work permit program for all welding and cutting activities; require atmospheric testing before any hot work on or adjacent to production tanks; verify contractor hot work programs before authorizing work.
→ Oilfield Service Contractors / Stringer
Implement hot work safety procedures including pre-job hazard review, atmospheric testing, and permit issuance for all welding work on or near tanks containing or previously containing hydrocarbons.
→ OSHA
Conduct targeted enforcement of hot work safety requirements at oilfield production facilities; issue guidance specific to hot work hazards at crude oil production and storage tank sites.
→ API
Promote wider adoption of API RP 2009 in the upstream oil production sector; update guidance to address specific hazards of tank vent vapors during hot work.
💡 Lessons Learned
Hot work on or adjacent to crude oil production tanks is one of the highest-risk activities in upstream oil and gas. Tank vents continuously emit flammable vapors under normal production conditions. Welding sparks in this environment will find an ignitable atmosphere unless the tank is completely cleaned, purged, and gas-tested before work begins.
A hot work permit system is not bureaucracy — it is the barrier between workers and an ignitable atmosphere. The three elements of effective hot work control are pre-job hazard review, atmospheric testing with a calibrated gas detector, and formal authorization. Any one of these elements, properly executed, could have prevented these deaths. All three were absent.
Facility operators are responsible for the safety of contractor workers performing work on their property — including verifying that the contractor has a hot work safety program and that the program is being used for the specific task.
API RP 2009 provides specific, actionable guidance for safe welding near flammable materials in the petroleum industry. This guidance was available and applicable at the time of the Partridge-Raleigh explosion. When applicable industry guidance is not implemented, fatalities that result are preventable by definition.
HWP: Hot Work PermitsSOP: Operating ProceduresCON: ContractorsTRN: Training
🔨 Safety Meeting Toolbox Talk
►Does your hot work permit system require atmospheric testing with a calibrated gas detector before any welding begins on or adjacent to tanks or vessels containing or previously containing flammable hydrocarbons?
►Before authorizing contractor hot work at your facility, do you verify that the contractor has an adequate hot work safety program and that permits are being issued?
►Have all personnel who authorize, perform, or observe hot work received training on the specific hazards of hot work near flammable liquid storage — including tank vent vapor flashback?
►Does your pre-job safety review for hot work include identification of all vent lines, uncapped connections, and other potential flammable vapor emission points?
Immediate Action Items
✓Audit your hot work permit program to confirm it requires atmospheric testing before any hot work on or adjacent to tanks in flammable service; update to require testing if not already required.
✓Establish a contractor verification process for hot work authorization that includes review of contractor procedures, worker training records, and gas detector calibration.
✓Provide training for all permit issuers and supervisors on the specific hazard of tank vent vapor flashback during welding.
✓Conduct a walkdown of all crude oil production or storage tank areas to identify uncapped vents, overflow pipes, or other flammable vapor emission points that create hazards for hot work.
🔗 PSM Failures Behind This Incident

This incident traced to breakdowns across 4 PSM elements (HOW · SOP · CON · TRN). Each represents a documented gap that process safety documentation and consulting can close before a similar event occurs at your facility.

Hot Work Permits
Unauthorized or poorly controlled ignition sources near flammable atmospheres are entirely preventable. A rigorous hot work permit system with pre-job atmospheric testing closes this pathway.
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Operating Procedures (SOPs)
Operators cannot reliably hold safe operating limits without clear, current, enforced procedures. Deviation from acceptable operating conditions — a root cause here — is a direct consequence of SOP failure.
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Contractor Safety Management
Contractor workers must be held to the same PSM standard as employees. When contractor safety oversight fails, knowledge and compliance gaps follow contract workers onto your site.
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Training & Operator Competency
Workers must understand process hazards — not just the steps on the page. Training records, refresher frequency, and verified competency are all OSHA PSM requirements that gaps here violated.
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