Spaces containing gasoline-powered machinery or gasoline storage tanks on small passenger vessels should have ventilator ducts that extend to the bilges because __________.
• Gasoline vapor behavior compared to air in enclosed spaces • Purpose of bilge ventilation on small passenger vessels • How flammable vapors accumulate and create explosion hazards
• Think about where gasoline vapors will naturally move and collect inside an enclosed machinery space. • Consider why regulations focus on ventilating the bilges specifically rather than only the upper part of the compartment. • Ask yourself what condition in the lowest part of the space would be most dangerous if there is a fuel leak.
• Verify whether gasoline vapors are heavier or lighter than air. • Check which area of a compartment (high or low) ventilation should protect most against explosive vapor accumulation. • Eliminate any choices that describe the opposite behavior of gasoline vapors or that don’t relate to explosion/fire risk.
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