On small passenger vessels, all spaces containing gasoline-powered machinery or gasoline storage tanks must be ventilated? Which is the requirement for the ventilation system?
• Gasoline vapor behavior in machinery spaces (is it heavier or lighter than air?) • Purpose of mechanical exhaust vs. mechanical supply in preventing explosions • 46 CFR small passenger vessel rules for ventilation of gasoline machinery spaces
• Think about where gasoline vapors collect in an enclosed engine space and which type of ventilation best removes vapors from low areas. • Ask yourself which part of the system is most critical to be forced/mechanical for safety: bringing fresh air in, or pulling dangerous vapors out? • Consider which options describe features for comfort or weather protection versus features specifically aimed at removing explosive vapors.
• Verify which option provides forced removal of vapors from the space, not just comfort or weather benefits. • Check that the system described would still remove gasoline vapors even if natural airflow is poor (e.g., hot, still day in a marina). • Eliminate any choices that focus on air conditioning, moisture control, or only on closing off openings, rather than actively clearing gasoline fumes.
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