You are towing a 1000 gross ton gasoline tank barge. Regulations say that cargo tank hatches, ullage holes, and Butterworth plates may remain open without flame screens ONLY __________.
• 46 CFR requirements for tank barges carrying flammable or combustible liquids • Purpose and function of flame screens on ullage/vent openings • Meaning of a tank being gas free in cargo operations
• Ask: What hazard are flame screens designed to protect against on gasoline tank barges? • Consider: Does a fire extinguisher, towing method, or time limit actually stop vapors from igniting at an opening? • Think: Under what specific condition would an open tank hatch no longer present a flammable vapor/ignition hazard?
• Verify how regulations define gas free and when a tank is considered safe for hot work or open access • Check whether any rule allows substituting fire extinguishers or tow arrangements for flame screens on open cargo tanks • Confirm if regulations specify any time-limited exception for leaving openings without flame screens
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