Engineering · Safety — Enclosed Space
Before entering a fuel or ballast tank, the most important atmospheric test, in order, begins with:
- AToxic gas, then oxygen, then flammability
- BOxygen content, then flammable gas, then toxic gas✓ Correct
- CTemperature, then humidity
- DFlammability only
Explanation
Test oxygen first (must read ~20.9%), then flammable vapors (well below LEL), then specific toxics (e.g., H2S, CO, benzene). Testing is done at multiple levels, continuously monitored, under a permit-to-work with a standby attendant.
Authority: SOLAS Chapter XI-1 Reg 7; enclosed-space entry guidance
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