You are pushing a 1,000 GT gasoline tank barge which is not gas free. By regulation, which is TRUE concerning cargo tank hatches, ullage holes, and Butterworth plates on the barge?
• 46 CFR regulations for tank barges carrying flammable or combustible liquids • Purpose of flame screens on ullage holes, hatches, and Butterworth openings • Meaning of "not gas free" and when explosive vapors may still be present
• Think about whether a barge that is "empty" of liquid but not gas free is actually safe from vapor ignition hazards. • Ask yourself if weather, season, or a senior crew member’s permission changes the basic fire and explosion risk of gasoline vapors. • Consider what the regulations are trying to prevent when they require flame screens on openings to cargo tanks with flammable vapors.
• Verify how the regulations treat a tank that is not gas free, even if it appears "empty" of liquid cargo. • Check whether there are any seasonal or weather-related exceptions to flame screen requirements for gasoline tank barges. • Confirm if crew discretion (e.g., senior crew member’s supervision) can override the regulatory requirement for flame screens on cargo tank openings.
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