The Tank Entry That Felt Wrong
At a ship repair yard, a 28-year-old welder is told to enter a 12-foot-deep ballast tank through an 18-inch hatch to finish a weld before the evening shift ends. The supervisor says the tank was 'aired out' and hands him a four-gas meter. The meter reads 19.2% oxygen, 4% LEL, 2 ppm hydrogen sulfide, and 0 ppm carbon monoxide. There is no entry permit, no attendant at the hatch, and no rescue tripod or retrieval line. The welder can see rust and standing water inside. The supervisor says, 'Five minutes, then we're done.' The welder has not been trained in confined space entry and has no harness. A coworker outside the tank is available but has not been assigned any role. The ship is on a tight schedule, and the supervisor has already warned the crew that anyone who slows the job will be sent home.
1. Identify the atmospheric and non-atmospheric hazards, and explain which OSHA maritime requirements apply.
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The atmospheric reading is not acceptable for entry. Oxygen at 19.2% is below the 19.5% threshold used for confined-space entry, so the space is oxygen-deficient even though 19.2% sounds close to normal. The 4% LEL shows flammable gas is present, and 2 ppm hydrogen sulfide is a toxic exposure that must be evaluated and controlled. A zero carbon monoxide reading does not make the space safe.
The non-atmospheric hazards are just as important: a 12-foot depth with an 18-inch hatch creates a difficult rescue, rust and standing water create slip and engulfment concerns, and welding adds fume and electrical hazards. The absence of a permit, attendant, rescue equipment, harness, and training is a direct violation of the shipyard confined-space requirements in 29 CFR 1915 Subpart B. The employer must treat this as a permit-required confined space, not a five-minute task.
2. What should the welder do before entering, and what immediate abatement steps must the employer take?
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The welder should not enter. The proper sequence is to stop work, notify the supervisor that the space is oxygen-deficient, and request that the space be ventilated and retested. Entry can occur only after the employer issues a permit, verifies acceptable atmospheric conditions, assigns a trained attendant, provides a rescue plan and retrieval system, and ensures the entrant is trained and wearing the required harness and PPE.
Immediate abatement includes continuous ventilation, atmospheric monitoring before and during entry, isolating energy sources, and posting the permit at the space. A rescue plan must be in place before anyone enters; calling 911 after a collapse is not a rescue plan. The employer should also remove the supervisor's production pressure from the decision and ensure the crew understands that entry without a permit is prohibited. The welder's refusal is protected because the hazard is imminent and the entry would violate the standard.
3. How do the welder's rights and the employer's duties interact in this situation?
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The welder has the right to refuse to perform work in an imminent-danger situation and the right to report the hazard without retaliation. The employer has a non-delegable duty to provide a workplace free of recognized hazards, to train workers on confined-space entry, and to enforce the permit system. The employer cannot rely on the welder's experience or on a coworker standing nearby as a substitute for an attendant and rescue plan.
If the welder is disciplined for stopping the job, that discipline could be retaliation under Section 11(c) of the OSH Act. The practical lesson is that production pressure does not shift the legal duty. The employer must fix the conditions first, document the permit and training, and only then allow entry.