The Gas No One Could See — Until the Barge Blew Apart
A deckhand stood about thirty feet away, loading molten sulfur onto a barge at a Gulf Coast refinery dock, when it exploded. Then it exploded again. The fuel had been building silently in the empty space above the sulfur for hours — and every tool to catch it before it reached that point already existed in the industry.
to explosive levels
the vapor reached
to the blast
seconds apart
An ordinary transfer, until it wasn't
Our client was a Jones Act seaman — a deckhand assigned to a fleet of working vessels. On the day of the incident he was doing a routine job: loading molten sulfur from a refinery into a barge tied up at the dock. The sulfur belonged to the refinery operator. The barge belonged to a third company. His paycheck came from a fourth. None of that mattered to the deckhand at the rail, and none of it would catch what was building inside the tank.
Without warning, the barge exploded. Flames shot into the air roughly thirty feet from where he stood. He keyed his radio and called for an emergency shutdown — and then a second blast came, with another surge of heat and gas. He was left with hearing loss and ringing in his ears, head trauma, dizziness, loss of balance, and persistent headaches, and was no longer the able-bodied workingman he had been that morning.
How molten sulfur quietly builds a bomb
To a bystander, loading sulfur looks inert. The chemistry underneath is not. Molten sulfur carries dissolved hydrogen sulfide — H2S, the "rotten egg" gas. When the sulfur is pumped, agitated, and splashed into a barge, that gas comes out of solution and collects in the vapor space: the pocket of air above the liquid that grows as the tank fills.
Hydrogen sulfide has a lower explosive limit of about four percent in air. Below that, it cannot detonate; at or above it, a single spark is enough. Over a long transfer — barge loading can run five or six hours — the gas accumulates in that closed space, and if it isn't vented away fast enough, the concentration climbs. Modeling of the transfer indicated it would take roughly four hours for the vapor space to reach the four-percent explosive threshold. After that, the barge was a waiting fuse.
The spark itself can come from more than one place. Sulfur flowing through a fill pipe can build a static-electricity charge; a rust-like scale called pyrophoric iron sulfide that forms inside steel tanks can ignite when a flake breaks loose and hits the air. The plaintiff's chemical-engineering expert concluded the explosive atmosphere was the controllable cause, with static electricity the most likely ignition — but, critically, every candidate ignition source is one that ordinary precautions are designed to defeat.
Three ways the companies tried to make it disappear
The mechanism is textbook industry chemistry, not a mystery. Molten sulfur carries hydrogen sulfide; transferring it releases that gas into the vapor space; over a multi-hour load it can cross the explosive limit. The industry has understood and controlled this hazard for decades — with adequate venting, slower transfer rates, and vent-gas monitoring that halts loading before the gas gets near the danger zone. A foreseeable, well-documented hazard is not a freak event.
Regulatory minimums are a floor, not the standard of care. Degassing strips hydrogen sulfide down to roughly ten parts per million — low enough to transport safely and compliant with transport limits — and is a recognized safe practice in the field. But the defense didn't even need to lose that fight: short of degassing, simple, cheap measures would have caught this. Monitor the vent gas with an explosimeter and stop the transfer when the reading climbs; slow the pump; vent adequately. "No rule made us" is not a defense to a hazard you could see coming and chose not to manage.
The ignition source is a distraction from the real failure. The controllable wrong was allowing an explosive atmosphere to form in the first place. Whatever lit it, the barge should never have been a tank full of explosive gas. And each candidate source has its own ordinary safeguard — grounding straps against static, periodic tank cleaning against pyrophoric scale — so the dispute over which spark fired doesn't erase the negligence that built the fuel.
Turning "no one knows what happened" into a documented chain
The defense wanted the explosion treated as unknowable. The work of the case was making it knowable, step by step.
A Ph.D. chemical engineer with more than twenty-five years in the field — including a decade specializing in refining, processing, and transferring molten sulfur — modeled the hydrogen-sulfide buildup and concluded the vapor space exceeded the explosive limit.
That same engineer had been brought in to investigate immediately after the blast, before any lawsuit existed — testimony grounded in the initial investigation, not assembled for trial.
A computer model of gas evolution and venting showed the explosive threshold being reached a few hours into a routine load — quantifying exactly how an ordinary transfer became a detonation.
Recognized, feasible precautions laid out on the record: adequate venting, reduced transfer rate, vent-gas monitoring with shutdown thresholds, fill-pipe design to limit agitation, and degassing.
After the incident, the facility required vessel operators to monitor their vent pipes and shut down at ten percent of the explosive limit — an even more cautious threshold than longstanding industry practice, and proof the precaution was both feasible and effective.
Record evidence pointed to a tank not cleaned as often as it should have been, a temperature sensor giving false readings, and a grounding system that was not properly connected — each one a recognized contributor to exactly this kind of explosion.
From the dock to the resolution
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The jobA Jones Act deckhand, assigned to a fleet of working vessels, is loading molten sulfur onto a barge at a Gulf Coast refinery dock.
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The hours beforeAs the sulfur is pumped in, hydrogen sulfide quietly accumulates in the vapor space above the liquid — unseen, unsmelled at dangerous levels, and unmonitored.
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The blastThe barge explodes about thirty feet from our client. He radios for an emergency shutdown — and a second explosion follows, with another wave of heat and gas.
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The injuriesHearing loss and tinnitus, head trauma, dizziness, loss of balance, and chronic headaches leave him with lasting impairment and lost earning capacity.
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The benefits fightOn top of the injury, his maritime employer denies and delays the maintenance-and-cure payments owed to an injured seaman.
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The caseSuit follows on Jones Act negligence, unseaworthiness of the barge, and maintenance and cure. Expert modeling establishes the explosive-atmosphere mechanism, and the facility's own tightened monitoring rule shows the danger was preventable.
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ResolutionAfter the hazard and the available precautions were laid out in the record, the matter resolved on confidential terms.
"No regulation required it" is not the same as "it was safe"
Companies reach for the same shield after an industrial explosion: there was no specific rule, most operators don't go further, so there was nothing to do differently. But the duty owed to a worker is reasonable care in the face of a known, foreseeable hazard — and the bare regulatory minimum is the floor of that duty, not the ceiling. When a danger is well understood and the fix is cheap and routine, "we did the minimum" is an admission, not a defense.
The second pattern is the invisible hazard. The most catastrophic process-safety failures don't announce themselves — they accumulate. A gas you can't see, climbing toward a threshold no one is watching, over hours of work that looks completely normal. The whole point of monitoring, venting, and transfer controls is to manage the danger you cannot perceive with your own senses. When a company skips that and waits for something to go wrong, something eventually does.
If this sounds like your situation
Case summary
A deckhand was loading molten sulfur onto a barge at a Gulf Coast refinery dock, standing about thirty feet away, when the barge exploded, then exploded again. Flammable gas had been building silently in the empty space above the sulfur for hours before it ignited.
Legal lessons from this case
- Carrying and loading hazardous cargo like molten sulfur demands monitoring of the gases it gives off.
- An accumulation of explosive vapor in a cargo space can reflect both negligence and an unseaworthy condition.
- Workers near, but not aboard, a vessel can still be injured by its unsafe operations and have maritime claims.
Injured in a maritime or refinery explosion — and being told nobody's at fault?
If you were hurt working on or around a vessel, dock, or refinery, and a company is pointing to "no violation," "no way to know what happened," or workers' comp to close the door — the answer is often already in the company's own files and the science of what failed. It's worth a hard look.
Request a Confidential Case ReviewConfidentiality & disclaimer. This case study describes a real matter handled by the firm, with names and identifying details removed or generalized to protect client confidentiality. It is provided for informational purposes only and is not legal advice.
Prior results do not guarantee or predict a similar outcome in any future case. Every matter is different and turns on its own facts. Reading this page does not create an attorney-client relationship. If you have a potential claim, consult a qualified attorney about your specific situation.
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