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Author: Veress Árpád · Explosion-protection expertDAILY Ex - 7 OCTOBER 2026
Today: a refinery gas-line fire forces a site-wide shutdown, two contractors are burned in a calcium-carbide incident, new research shows how dust lying inside ductwork can sustain explosion propagation, and tomorrow’s EMEA Process Safety Day puts combustible dust and ATEX directly on the operator agenda.
⚡ DAILY Ex - 7 OCTOBER 2026
Explosion Protection | Operational Ex | Global Watch
Today: a refinery gas-line fire forces a site-wide shutdown, two contractors are burned in a calcium-carbide incident, new research shows how dust lying inside ductwork can sustain explosion propagation, and tomorrow’s EMEA Process Safety Day puts combustible dust and ATEX directly on the operator agenda.
▶️ CARDÓN REFINERY - FIRE, EXPLOSIONS AND SITE-WIDE SHUTDOWN
CURRENT | Venezuela - 6 October
A major fire broke out yesterday at Venezuela’s Cardón refinery, part of the Paraguaná Refining Complex.
Reporting citing refinery sources says the fire originated around a gas line connected to the diesel hydrotreating unit. Operations across the refinery were temporarily stopped, personnel evacuated and the fire extinguished in less than an hour. Explosions were reported during the event, but no worker injuries were reported. The exact initiating cause remains unconfirmed.
Why it matters operationally:
The important barrier sequence is: loss of containment → detection → isolation → evacuation → shutdown → firefighting → safe restart.
A successful emergency shutdown is not the end of the event.
The next major risk decision is: When is it safe to restart?
That requires understanding the failure mechanism, checking adjacent equipment, verifying isolation and protection systems, and completing an appropriate PSSR.
▶️ CALCIUM CARBIDE TWO CONTRACTORS BURNED
CURRENT | USA - 6 October
Two contract workers were injured yesterday following a flash fire at http://www.carbidellc.com/ in Louisville, Kentucky.
Firefighters responding to an initially reported explosion found a small fire involving a roughly 5,000-pound transfer tote containing calcium carbide in an outdoor staging area. Both workers were transported to hospital with burns. Preliminary information describes the event as a flash fire; the cause remains under investigation.
Calcium carbide deserves particular respect because contact with water can generate highly flammable acetylene.
But we should not jump ahead of the investigation and claim that mechanism caused yesterday’s event.
Operational lesson: When contractors interact with hazardous material, responsibility does not transfer with the work order.
Ask: material hazard understood? → task assessed? → contamination/water interaction considered? → ignition sources controlled? → contractor competence verified? → emergency action understood?
Contractor control is an Operational Ex barrier.
▶️ NEW RESEARCH - DUST LYING IN A PIPE CAN BECOME THE FUEL
CURRENT RESEARCH | October 2026
A newly published experimental study in the Journal of Loss Prevention in the Process Industries examined silicon dust explosions in ducts and pipes.
Researchers deposited dust layers inside pipes and initiated an explosion from a connected vessel. The propagating event lifted settled silicon and ferrosilicon-magnesium dust from the pipe, allowing flame propagation through the duct system.
That is an important practical reminder.
We normally picture a dust explosion as: suspended dust cloud + ignition.
But the initial event itself can disturb deposited dust and create fuel for further propagation.
Why it matters operationally: A duct that looks “empty” may still contain the inventory needed for escalation.
Housekeeping therefore includes places operators cannot easily see: ducts → extraction lines → dead legs → collectors → enclosed conveyors.
https://www.sciencedirect.com/science/article/pii/S0950423026002007
▶️ TOMORROW - ATEX & COMBUSTIBLE DUST ON THE PROCESS-SAFETY AGENDA
UPCOMING | Türkiye - 8 October
The inaugural PSRG EMEA Process Safety Day takes place tomorrow in Istanbul for owner/operator companies.
The programme explicitly includes: Dust Explosion Prevention & Process Safety Management → Combustible Dust & Explosion Protection → ATEX Compliance → Process Safety KPIs.
That combination is important.
ATEX compliance should not exist separately from process-safety performance.
A useful management question is: What Ex indicators actually reach the Head of Operations?
Overdue detailed inspections? Open Ex defects? P1/P2 findings? Temporary deviations? Overdue repairs? Bypassed protection systems? Repeat findings?
Why it matters: if management cannot see deterioration, management cannot manage it.
https://www.psrgroup.com/inaugural-psrg-emea-process-safety-day-istanbul-turkiye-8-october-2026/
▶️ COMPETENCE / INSPECTION - VERIFY THE REPAIR BEFORE RETURN TO SERVICE
An Ex enclosure comes back from repair.
It looks excellent.
Before reinstalling it, ask:
Who repaired it? Against which manufacturer information / IEC 60079-19 basis? What was actually repaired? Were critical Ex dimensions or protection features affected? Where is the repair record? Who accepts it back into service?
“Repaired” describes an activity.
“Ex integrity restored” requires evidence.
▶️ OPERATIONAL Ex USE CASE - THE NEW VACUUM CLEANER
PRACTICAL
Housekeeping complains that the existing vacuum cleaner is too slow. Procurement buys a more powerful industrial vacuum. Excellent machine. But nobody checks the Ex requirement.
Now it enters a Zone 22 powder area. The irony is obvious: A tool purchased to remove combustible dust can become an ignition source inside combustible dust.
Before portable equipment enters hazardous areas, verify: zone → dust/gas group → EPL/category → temperature → equipment marking → condition → intended use.
“Industrial” does not mean “Ex”.
▶️ GOOD ENGINEERING PRACTICE - LOOK INSIDE THE DUCT - reinforced by today's research
Choose one dust extraction system.
Everyone knows whether the floor around it is clean.
But ask:
What is inside the duct?
Has airflow fallen? Has powder settled? Are there horizontal sections? Dead legs? Changed branches? Damaged dampers? Product buildup?
Then ask the key question: Could an initial fire or explosion lift those deposits and propagate through the system?
Housekeeping should not stop where eyesight stops.
▶️ TODAY'S Ex QUESTION
Ask the Head of Operations: “What Ex information reaches your desk every month?”
If the answer is: “We have an annual Ex inspection report.” and go one level deeper.
You probably need visibility of: open defects → criticality → overdue actions → temporary deviations → protection-system availability → repeat failures → competence gaps.
Because an Ex inspection identifies conditions.
Operations decides what happens next.
That is the difference between Ex compliance and Operational Ex.